[External] : Re: Generational ZGC issue

Johannes Lichtenberger lichtenberger.johannes at gmail.com
Sat Feb 17 23:01:29 UTC 2024


Rerun the test with `johannes at luna:~/IdeaProjects/sirix$ time ./gradlew
:sirix-core:test --tests
io.sirix.service.json.shredder.JsonShredderTest.testChicagoDescendantAxis`

and -XX:MaxDirectMemorySize=1g

...

real    5m8,135s
user    0m1,799s
sys 0m0,374s

I've attached the log. Stuff like this may be strange, or normal?

[183,700s][debug  ][gc,remset      ] GC(57) y: scan_forwarding failed
retain safe 0x00000001dbe00000
[183,700s][debug  ][gc,remset      ] GC(57) y: scan_forwarding failed
retain safe 0x00000001dc200000
[183,700s][debug  ][gc,remset      ] GC(57) y: scan_forwarding failed
retain safe 0x00000001e2600000
[183,700s][debug  ][gc,remset      ] GC(57) y: scan_forwarding failed
retain safe 0x00000001e3e00000
[183,700s][debug  ][gc,remset      ] GC(57) y: scan_forwarding failed
retain safe 0x00000001f2400000
[183,700s][debug  ][gc,remset      ] GC(57) y: scan_forwarding failed
retain safe 0x00000001f9200000
[183,700s][debug  ][gc,remset      ] GC(57) y: Scan_Forwarding Failed
Retain Safe 0x00000001fac00000

kind regards
Johannes

Am Sa., 17. Feb. 2024 um 21:46 Uhr schrieb Johannes Lichtenberger <
lichtenberger.johannes at gmail.com>:

> With setting the max direct memory to 2Gb (-XX:MaxDirectMemorySize=2g) and
> using DirectByteBuffers under the hood using Chronicle Bytes, the test runs
> on my laptop, but as said way slower than with non generational ZGC or G1
> (and with G1 it's even fastest).
>
> real    4m58,836s
> user    0m1,849s
> sys 0m0,297s
>
> It caps at around 20Gb RAM usage and I think swapping somehow occurred at
> some point (452MB of 2GB).
>
> Before, setting MaxDIrectMemorySize to 5g (too high), the memory usage
> (watching `htop`) went to around 25Gb before heavy swapping occurred and
> the test failed at some point...
>
> kind regards
> Johannes
>
> Am Sa., 17. Feb. 2024 um 19:13 Uhr schrieb Erik Osterlund <
> erik.osterlund at oracle.com>:
>
>> Could you check how much is user time vs system time? It smells like you
>> are swapping. When swapping starts, performance goes out of the window.
>>
>> /Erik
>>
>> On 17 Feb 2024, at 16:21, Johannes Lichtenberger <
>> lichtenberger.johannes at gmail.com> wrote:
>>
>> 
>> I'll check later on if the test doesn't fail with the 2g max and I'll
>> have to check as well if it's still the OutOfMemoryError (as I'm not at
>> home currently). But everytime everything freezes for a couple of seconds.
>>
>> In any case isn't it strange that with G1 and ZGC the runtime is very
>> close to each other with G1 having the upper hand slightly, when switching
>> to on heap ByteBuffers, but with Generational ZGC the runtime almost
>> exactly doubles? I thought at some point the generational version should
>> make the non generational obsolet and as almost every object dies young the
>> generational ZGC should be better as you wrote!?
>>
>> Kind regards and have a nice weekend (and kind of feel sorry for
>> bothering that much)
>> Johannes
>>
>> Stefan Johansson <stefan.johansson at oracle.com> schrieb am Sa., 17. Feb.
>> 2024, 15:54:
>>
>>> Ok, when you say crashes, what do you mean. Are you still seeing the
>>> same OutOfMemoryError or are we talking about an actual JVM crash. Or is
>>> it the Linux OOM killer stepping in because of high memory pressure?
>>>
>>> If this is with the new setting of 5g for direct memory it could be that
>>> these 3 extra gigs of memory is pushing you over the limit for what can
>>> be handle by you laptop. Generally, if you start swapping, the
>>> performance is out the door and you need to look at the configuration.
>>> Maybe the 2g for direct memory is reasonable on this setup to avoid
>>> swapping. I looked a bit at the total memory usage for the process here
>>> and it seem to be around 20G.
>>>
>>> Stefan
>>>
>>> On 2024-02-17 12:24, Johannes Lichtenberger wrote:
>>> > So, switching back to DirectByteBuffers, and removing the disabling of
>>> > explicit GCs still crashes on my laptop (swapping + close to 32 Gb RAM
>>> > used)...
>>> >
>>> > kind regards
>>> > Johannes
>>> >
>>> > Am Sa., 17. Feb. 2024 um 10:22 Uhr schrieb Stefan Johansson
>>> > <stefan.johansson at oracle.com <mailto:stefan.johansson at oracle.com>>:
>>> >
>>> >
>>> >
>>> >     On 2024-02-17 00:36, Johannes Lichtenberger wrote:
>>> >      > I just removed "-XX+DisableExplizitGC", increased max direct
>>> >     memory size
>>> >      > to 5g (-XX:MaxDirectMemorySize=5g), but also changed
>>> >      > Bytes::elasticByteBuffer to Bytes.elasticHeapByteBuffer(60_000);
>>> >      > to use on heap ByteBuffers.
>>> >      >
>>> >
>>> >     Just for clarity, when using HeapByteBuffers the
>>> MaxDirectMemorySize
>>> >     has
>>> >     no effect since the ByteBuffers will be stored on the heap. But if
>>> you
>>> >     keep going with DirectByteBuffers, this might make sense to give
>>> some
>>> >     more head room.
>>> >
>>> >      > However, the performance seems to be way worse. I've repeated
>>> the
>>> >     test
>>> >      > several times, but with both G1 and non generational ZGC it's
>>> >     ~50s for
>>> >      > importing the JSON file in the first case vs ~100s using
>>> >     generational
>>> >      > ZGC, using Temurin 21.0.2 with similar values for the actual
>>> >     traversals.
>>> >      >
>>> >
>>> >     Ok, sounds like using DirectByteBuffers is a performance win here.
>>> >     If so
>>> >     I would just continue testing using DirectByteBuffers and allowing
>>> >     explicit GCs to ensure they are cleaned out properly.
>>> >
>>> >      >  From the log on STDOUT, I can see this (meaning 0,319s and
>>> >     0,440s...
>>> >      > pause times?)
>>> >      >
>>> >
>>> >     No, with ZGC the time here is not the pause time, it's the time to
>>> >     complete the whole GC. ZGC is a concurrent GC, meaning that most
>>> of the
>>> >     GC work is done concurrently with the Java application still
>>> running.
>>> >     There are still a some very short pauses, all way below 1ms. You
>>> can
>>> >     see
>>> >     them if you look at the detailed log:
>>> >
>>> >     [30,938s][info][gc          ] GC(3) Minor Collection (Allocation
>>> Rate)
>>> >     [30,938s][info][gc,phases   ] GC(3) y: Young Generation
>>> >     [30,938s][info][gc,phases   ] GC(3) y: Pause Mark Start 0,060ms
>>> >     [31,322s][info][gc,phases   ] GC(3) y: Concurrent Mark 383,563ms
>>> >     [31,322s][info][gc,phases   ] GC(3) y: Pause Mark End 0,046ms
>>> >     [31,322s][info][gc,phases   ] GC(3) y: Concurrent Mark Free 0,009ms
>>> >     [31,322s][info][gc,phases   ] GC(3) y: Concurrent Reset Relocation
>>> Set
>>> >     0,201ms
>>> >     [31,335s][info][gc,phases   ] GC(3) y: Concurrent Select
>>> Relocation Set
>>> >     13,228ms
>>> >     [31,335s][info][gc,phases   ] GC(3) y: Pause Relocate Start 0,019ms
>>> >     [31,381s][info][gc,phases   ] GC(3) y: Concurrent Relocate 45,967ms
>>> >     [31,382s][info][gc,phases   ] GC(3) y: Young Generation
>>> >     9726M(63%)->518M(3%) 0,444s
>>> >     [31,382s][info][gc          ] GC(3) Minor Collection (Allocation
>>> Rate)
>>> >     9726M(63%)->518M(3%) 0,444s
>>> >
>>> >     Here I included the phase-logs for a single GC of the young
>>> generation,
>>> >     where you can clearly see how much time was spent in which part of
>>> the
>>> >     GC and as you can see the three pauses are all very very short.
>>> >
>>> >     Stefan
>>> >
>>> >      > [35,718s][info   ][gc      ] GC(9) Minor Collection (Allocation
>>> >     Rate)
>>> >      > 12462M(81%)->1556M(10%) 0,319s
>>> >      > [40,871s][info   ][gc      ] GC(10) Minor Collection (Allocation
>>> >     Rate)
>>> >      > [41,311s][info   ][gc      ] GC(10) Minor Collection (Allocation
>>> >     Rate)
>>> >      > 13088M(85%)->1432M(9%) 0,440s
>>> >      > [46,236s][info   ][gc      ] GC(11) Minor Collection (Allocation
>>> >     Rate)
>>> >      > [46,603s][info   ][gc      ] GC(11) Minor Collection (Allocation
>>> >     Rate)
>>> >      > 12406M(81%)->1676M(11%) 0,367s
>>> >      > [51,445s][info   ][gc      ] GC(12) Minor Collection (Allocation
>>> >     Rate)
>>> >      > [51,846s][info   ][gc      ] GC(12) Minor Collection (Allocation
>>> >     Rate)
>>> >      > 12848M(84%)->1556M(10%) 0,401s
>>> >      > [56,203s][info   ][gc      ] GC(13) Major Collection (Proactive)
>>> >      > [56,368s][info   ][gc      ] GC(13) Major Collection (Proactive)
>>> >      > 11684M(76%)->484M(3%) 0,166s
>>> >      >
>>> >      > kind regards
>>> >      > Johannes
>>> >      >
>>> >      > Am Fr., 16. Feb. 2024 um 22:39 Uhr schrieb Erik Osterlund
>>> >      > <erik.osterlund at oracle.com <mailto:erik.osterlund at oracle.com>
>>> >     <mailto:erik.osterlund at oracle.com <mailto:
>>> erik.osterlund at oracle.com>>>:
>>> >      >
>>> >      >     It’s worth noting that when using ZGC, calling System.gc
>>> does not
>>> >      >     invoke a classic disastrously long GC pause. Instead, a
>>> >     concurrent
>>> >      >     GC is triggered, which should be not that noticeable to the
>>> >      >     application. The thread calling System.gc is blocked until
>>> >     the GC is
>>> >      >     done, but the other threads can run freely.
>>> >      >
>>> >      >     /Erik
>>> >      >
>>> >      >      > On 16 Feb 2024, at 21:55, Stefan Johansson
>>> >      >     <stefan.johansson at oracle.com
>>> >     <mailto:stefan.johansson at oracle.com>
>>> >     <mailto:stefan.johansson at oracle.com
>>> >     <mailto:stefan.johansson at oracle.com>>>
>>> >      >     wrote:
>>> >      >      >
>>> >      >      > 
>>> >      >      >
>>> >      >      >> On 2024-02-16 18:04, Johannes Lichtenberger wrote:
>>> >      >      >> Thanks a lot, I wasn't even aware of the fact, that
>>> >      >     DirectByteBuffers use System.gc() and I always had in mind
>>> that
>>> >      >     calling System.gc() at least in application code is bad
>>> >     practice (or
>>> >      >     at least we shouldn't rely on it) and I think I read
>>> somewhere a
>>> >      >     while ago, that it's recommended to even disable this, but
>>> may be
>>> >      >     completely wrong, of course.
>>> >      >      > In most cases callling System.gc() is bad practice, in
>>> some
>>> >      >     special cases it might be needed.
>>> >      >      >
>>> >      >      >> I'll change it to on-heap byte buffers tomorrow :-)
>>> >      >      >> I think your GC log entries were from G1, right? It
>>> seems ZGC
>>> >      >     always tries to use the full heap :-)
>>> >      >      >
>>> >      >      > Yes, the snippet was G1, it was mostly to show that the
>>> >     pressure
>>> >      >     isn't high. You are correct that ZGC uses more of the given
>>> >     heap but
>>> >      >     the collections are pretty far apart and I'm certian it
>>> would
>>> >      >     function well with a smaller heap as well. Maybe in that
>>> case
>>> >     some
>>> >      >     Major collections would be triggered.
>>> >      >      >
>>> >      >      >> Kind regards and thanks for sharing your insights.
>>> >      >      >
>>> >      >      > No problem. We appriciate the feedback,
>>> >      >      > StefanJ
>>> >      >      >
>>> >      >      >> Have a nice weekend as well
>>> >      >      >> Johannes
>>> >      >      >> Stefan Johansson <stefan.johansson at oracle.com
>>> >     <mailto:stefan.johansson at oracle.com>
>>> >      >     <mailto:stefan.johansson at oracle.com
>>> >     <mailto:stefan.johansson at oracle.com>>
>>> >      >     <mailto:stefan.johansson at oracle.com
>>> >     <mailto:stefan.johansson at oracle.com>
>>> >      >     <mailto:stefan.johansson at oracle.com
>>> >     <mailto:stefan.johansson at oracle.com>>>> schrieb am Fr., 16. Feb.
>>> >      >     2024, 17:38:
>>> >      >      >>    Hi,
>>> >      >      >>    Some comments inline.
>>> >      >      >>    On 2024-02-16 16:47, Johannes Lichtenberger wrote:
>>> >      >      >>     > Thanks a lot for looking into it, I've added
>>> >      >      >>     > `-XX:MaxDirectMemorySize=2g` only recently, but
>>> >     without it
>>> >      >     failed as
>>> >      >      >>     > well,  so not sure what the default is. Will
>>> definitely
>>> >      >     check your
>>> >      >      >>     > suggestions :-)
>>> >      >      >>     >
>>> >      >      >>    If you don't set a limit it will be set to:
>>> >      >      >>    Runtime.getRuntime().maxMemory()
>>> >      >      >>    So likely a good idea to set a reasonable limit, but
>>> the
>>> >      >     smaller the
>>> >      >      >>    limit is the more frequent we need to run reference
>>> >      >     processing to allow
>>> >      >      >>    memory to be freed up.
>>> >      >      >>     > Sadly I'm currently working alone on the project
>>> in my
>>> >      >     spare time
>>> >      >      >>     > (besides professionally switched from Java/Kotlin
>>> >     stuff to the
>>> >      >      >>    embedded
>>> >      >      >>     > software world) and I'm not sure if the current
>>> >      >     architecture of
>>> >      >      >>    Sirix is
>>> >      >      >>     > limited by too much GC pressure. I'd probably have
>>> >     to check
>>> >      >      >>    Cassandra at
>>> >      >      >>     > some point and look into flame graphs and stuff
>>> for
>>> >     their
>>> >      >      >>    integration
>>> >      >      >>     > tests, but maybe you can give some general
>>> >     insights/advice...
>>> >      >      >>     >
>>> >      >      >>     > Yesterday evening I switched to other JDKs (also I
>>> >     want to
>>> >      >     test with
>>> >      >      >>     > Shenandoah in particular), but I think especially
>>> the
>>> >      >     better escape
>>> >      >      >>     > analysis of the GraalVM is a huge plus in the
>>> case of
>>> >      >     SirixDB (for
>>> >      >      >>     > insertion on my laptop it's ~90s vs ~60s),  but I
>>> >     think it
>>> >      >     should be
>>> >      >      >>     > faster and currently my suspicion is that garbage
>>> >     is a major
>>> >      >      >>    performance
>>> >      >      >>     > issue.
>>> >      >      >>     >
>>> >      >      >>     > Maybe the GC pressure in general is a major issue,
>>> >     as in
>>> >      >     the CPU
>>> >      >      >>    Flame
>>> >      >      >>     > graph IIRC the G1 had about 20% stack frames
>>> >     allocated and non
>>> >      >      >>     > generational ZGC even around 40% taking all
>>> threads
>>> >     into
>>> >      >     account.
>>> >      >      >>     >
>>> >      >      >>      From what I/we see, the GC pressure in the given
>>> test is
>>> >      >     not high.
>>> >      >      >>    The
>>> >      >      >>    allocation rate is below 1GB/s and since most of it
>>> >     die young
>>> >      >     the GCs
>>> >      >      >>    are fairly cheap. In this log snippet G1 shows a GC
>>> >     every 5s
>>> >      >     and the
>>> >      >      >>    pause time is below 50ms:
>>> >      >      >>    [296,016s][info   ][gc      ] GC(90) Pause Young
>>> >     (Normal) (G1
>>> >      >      >>    Evacuation
>>> >      >      >>    Pause) 5413M->1849M(6456M) 35,577ms
>>> >      >      >>    [301,103s][info   ][gc      ] GC(91) Pause Young
>>> >     (Normal) (G1
>>> >      >      >>    Evacuation
>>> >      >      >>    Pause) 5417M->1848M(6456M) 33,357ms
>>> >      >      >>    [306,041s][info   ][gc      ] GC(92) Pause Young
>>> >     (Normal) (G1
>>> >      >      >>    Evacuation
>>> >      >      >>    Pause) 5416M->1848M(6456M) 32,763ms
>>> >      >      >>    [310,849s][info   ][gc      ] GC(93) Pause Young
>>> >     (Normal) (G1
>>> >      >      >>    Evacuation
>>> >      >      >>    Pause) 5416M->1847M(6456M) 33,086ms
>>> >      >      >>    I also see that the heap never expands to more the
>>> >     ~6.5GB even
>>> >      >      >>    though it
>>> >      >      >>    is allow to be 15GB and this also suggest that the GC
>>> >     is not
>>> >      >     under much
>>> >      >      >>    pressure. As I said in the previous mail, the reason
>>> >      >     Generational ZGC
>>> >      >      >>    don't free up the direct memory without the
>>> >     System.gc() calls
>>> >      >     is that
>>> >      >      >>    the GC pressure is not high enough to trigger any
>>> Major
>>> >      >     cycles. So I
>>> >      >      >>    would strongly recommend you to not run with
>>> >      >     -XX+DisableExplicitGC
>>> >      >      >>    unless you really have to. Since you are using
>>> >      >     DirectByteBuffers and
>>> >      >      >>    they use System.gc() to help free memory when the
>>> limit is
>>> >      >     reached.
>>> >      >      >>     > So in general I'm thinking about backing the
>>> >      >     KeyValueLeafPages with
>>> >      >      >>     > MemorySegments, but I think due to variable sized
>>> pages
>>> >      >     it's getting
>>> >      >      >>     > tricky, plus I currently don't have the time for
>>> >     changing
>>> >      >      >>    fundamental
>>> >      >      >>     > stuff and I'm even not sure if it'll bring a
>>> >     performance
>>> >      >     boost, as I
>>> >      >      >>     > have to adapt neighbour relationships of the nodes
>>> >     often and
>>> >      >      >>    off-heap
>>> >      >      >>     > memory access might be slightly worse performance
>>> wise.
>>> >      >      >>     >
>>> >      >      >>     > What do you think?
>>> >      >      >>     >
>>> >      >      >>    I know to little about the application to be able to
>>> give
>>> >      >     advice here,
>>> >      >      >>    but I would first start with having most memory on
>>> >     heap. Only
>>> >      >     large
>>> >      >      >>    long
>>> >      >      >>    lived stuff off-heap, if really needed. Looking at
>>> the
>>> >     test
>>> >      >     at hand, it
>>> >      >      >>    really doesn't look like it is long lived stuff that
>>> is
>>> >      >     placed off heap.
>>> >      >      >>     > I've attached a memory flame graph and there it
>>> >     seems the
>>> >      >     byte array
>>> >      >      >>     > from deserializing each page is prominent, but
>>> that
>>> >     might be
>>> >      >      >>    something I
>>> >      >      >>     > can't even avoid (after decompression via Snappy
>>> or via
>>> >      >     another
>>> >      >      >>    lib and
>>> >      >      >>     > maybe also decryption in the future).
>>> >      >      >>     >
>>> >      >      >>     > As of now G1 with GraalVM seems to perform best (a
>>> >     little
>>> >      >     bit better
>>> >      >      >>     > than with non generational ZGC, but I thought ZGC
>>> >     or maybe
>>> >      >      >>    Shenandoah
>>> >      >      >>     > would improve the situation). But as said I may
>>> have to
>>> >      >     generate way
>>> >      >      >>     > less garbage after all in general for good
>>> >     performance!?
>>> >      >      >>     >
>>> >      >      >>     > All in all maybe due to most objects die young
>>> >     maybe also the
>>> >      >      >>     > generational GCs are not needed (that said if
>>> >     enough RAM is
>>> >      >      >>    available
>>> >      >      >>     > and the Caffeine Caches are sized accordingly most
>>> >     objects may
>>> >      >      >>    die old).
>>> >      >      >>     > But apparently the byte arrays holding the page
>>> >     data still die
>>> >      >      >>    young (in
>>> >      >      >>     > AbstractReader::deserialize). In fact I'm not
>>> even sure
>>> >      >     why they
>>> >      >      >>    escape,
>>> >      >      >>     > but currently I'm on my phone.
>>> >      >      >>     >
>>> >      >      >>    It's when most objects die young the Generational GC
>>> >     really
>>> >      >     shines,
>>> >      >      >>    because it can handle the short lived objects without
>>> >     having
>>> >      >     to look at
>>> >      >      >>    the long lived objects. So I would say Generational
>>> >     ZGC is a
>>> >      >     good fit
>>> >      >      >>    here, but we need to let the System.gc() run to allow
>>> >     reference
>>> >      >      >>    processing or slightly re-design and use
>>> HeapByteBuffers.
>>> >      >      >>    Have a nice weekend,
>>> >      >      >>    Stefan
>>> >      >      >>     > Kind regards
>>> >      >      >>     > Johannes
>>> >      >      >>     >
>>> >      >      >>     > Stefan Johansson <stefan.johansson at oracle.com
>>> >     <mailto:stefan.johansson at oracle.com>
>>> >      >     <mailto:stefan.johansson at oracle.com
>>> >     <mailto:stefan.johansson at oracle.com>>
>>> >      >      >>    <mailto:stefan.johansson at oracle.com
>>> >     <mailto:stefan.johansson at oracle.com>
>>> >      >     <mailto:stefan.johansson at oracle.com
>>> >     <mailto:stefan.johansson at oracle.com>>>
>>> >      >      >>     > <mailto:stefan.johansson at oracle.com
>>> >     <mailto:stefan.johansson at oracle.com>
>>> >      >     <mailto:stefan.johansson at oracle.com
>>> >     <mailto:stefan.johansson at oracle.com>>
>>> >      >      >>    <mailto:stefan.johansson at oracle.com
>>> >     <mailto:stefan.johansson at oracle.com>
>>> >      >     <mailto:stefan.johansson at oracle.com
>>> >     <mailto:stefan.johansson at oracle.com>>>>> schrieb am Fr., 16. Feb.
>>> >      >      >>    2024, 13:43:
>>> >      >      >>     >
>>> >      >      >>     >     Hi Johannes,
>>> >      >      >>     >
>>> >      >      >>     >     We've spent some more time looking at this and
>>> >     getting the
>>> >      >      >>    json-file to
>>> >      >      >>     >     reproduced it made it easy to verify our
>>> >     suspicions.
>>> >      >     Thanks for
>>> >      >      >>     >     uploading it.
>>> >      >      >>     >
>>> >      >      >>     >     There are a few things playing together here.
>>> >     The test is
>>> >      >      >>    making quite
>>> >      >      >>     >     heavy use of DirectByteBuffers and you limit
>>> >     the usage
>>> >      >     to 2G
>>> >      >      >>     >     (-XX:MaxDirectMemorySize=2g). The life cycle
>>> and
>>> >      >     freeing of
>>> >      >      >>    the native
>>> >      >      >>     >     memory part of the DirectByteBuffer rely on
>>> >     reference
>>> >      >      >>    processing. In
>>> >      >      >>     >     generational ZGC reference processing is only
>>> done
>>> >      >     during Major
>>> >      >      >>     >     collections and since the general GC preassure
>>> >     in this
>>> >      >      >>    benchmark is
>>> >      >      >>     >     very
>>> >      >      >>     >     low (most objects die young), we do not
>>> trigger
>>> >     that
>>> >      >     many Major
>>> >      >      >>     >     collections.
>>> >      >      >>     >
>>> >      >      >>     >     Normaly this would not be a problem. To avoid
>>> >     throwing
>>> >      >     an out
>>> >      >      >>    of memory
>>> >      >      >>     >     error (due to hitting the direct buffer memory
>>> >     limit) too
>>> >      >      >>    early the JDK
>>> >      >      >>     >     triggers a System.gc(). This should trigger
>>> >     reference
>>> >      >      >>    procesing and all
>>> >      >      >>     >     buffers that are no longer in use would be
>>> freed.
>>> >      >     Since you
>>> >      >      >>    specify the
>>> >      >      >>     >     option -XX:+DisableExplicitGC all these calls
>>> to
>>> >      >     trigger GCs are
>>> >      >      >>     >     ignored
>>> >      >      >>     >     and no direct memory will be freed. So in our
>>> >     testing,
>>> >      >     just
>>> >      >      >>    removing
>>> >      >      >>     >     this flags makes the test pass.
>>> >      >      >>     >
>>> >      >      >>     >     Another solution is to look at using
>>> >     HeapByteBuffers
>>> >      >     instead
>>> >      >      >>    and don't
>>> >      >      >>     >     have to worry about the direct memory usage.
>>> The
>>> >      >     OpenHFT lib
>>> >      >      >>    seems to
>>> >      >      >>     >     have support for this by just using
>>> >      >      >>    elasticHeapByteBuffer(...) instead
>>> >      >      >>     >     of elasticByteBuffer().
>>> >      >      >>     >
>>> >      >      >>     >     Lastly, the reason for this working with
>>> >      >     non-generational ZGC is
>>> >      >      >>     >     that it
>>> >      >      >>     >     does reference processing for every GC.
>>> >      >      >>     >
>>> >      >      >>     >     Hope this helps,
>>> >      >      >>     >     StefanJ
>>> >      >      >>     >
>>> >      >      >>     >
>>> >      >      >>     >     On 2024-02-15 21:53, Johannes Lichtenberger
>>> wrote:
>>> >      >      >>     >      > It's a laptop, I've attached some details.
>>> >      >      >>     >      >
>>> >      >      >>     >      > Furthermore, if it seems worth digging
>>> >     deeper into the
>>> >      >      >>    issue, the
>>> >      >      >>     >     JSON
>>> >      >      >>     >      > file is here for one week:
>>> >      >      >>     >      >
>>> >     https://www.transfernow.net/dl/20240215j9NaPTc0
>>> <https://urldefense.com/v3/__https://www.transfernow.net/dl/20240215j9NaPTc0__;!!ACWV5N9M2RV99hQ!LO8iMrNtVuMHM0elGqimqgkyKip3sUQtngpyEvIeEXo_ydu21QQ0KfHymFrv5r3aiNLd_8GiYZJTq_TmlUIg_mVrq6cVng$>
>>> >     <
>>> https://urldefense.com/v3/__https://www.transfernow.net/dl/20240215j9NaPTc0__;!!ACWV5N9M2RV99hQ!Oy8M_MVHordSb4P3bQK7FIsjr7OUWYsKxpJWW-5Hsq4QmU-5utLsNbRRM5kiyoHWE92dAWA7n38XpX68XvdBhd0HudjOaY-y$
>>> >
>>> >      >
>>> >       <
>>> https://urldefense.com/v3/__https://www.transfernow.net/dl/20240215j9NaPTc0__;!!ACWV5N9M2RV99hQ!M33-mkbNfIFidOtIRYJLrdt970BIn5XjvmSvgBg0Ip6zkm5Zk7w6OG6FunFxjzDpUZju_f7FbEua8sTaS9Q3SnufNTFwuk6i$
>>> <
>>> https://urldefense.com/v3/__https://www.transfernow.net/dl/20240215j9NaPTc0__;!!ACWV5N9M2RV99hQ!M33-mkbNfIFidOtIRYJLrdt970BIn5XjvmSvgBg0Ip6zkm5Zk7w6OG6FunFxjzDpUZju_f7FbEua8sTaS9Q3SnufNTFwuk6i$
>>> >>
>>> >      >      >>
>>> >      >
>>> >       <
>>> https://urldefense.com/v3/__https://www.transfernow.net/dl/20240215j9NaPTc0__;!!ACWV5N9M2RV99hQ!O5j6Ri-Ostqq68q1zm71CEhSQ4CE7DqBfHZNq7cDAhU7b7CwqrnIA-ddZFaQDbOMAkgHkFriNeIrXJdRofVuv1UybJynYpht$
>>> <
>>> https://urldefense.com/v3/__https://www.transfernow.net/dl/20240215j9NaPTc0__;!!ACWV5N9M2RV99hQ!O5j6Ri-Ostqq68q1zm71CEhSQ4CE7DqBfHZNq7cDAhU7b7CwqrnIA-ddZFaQDbOMAkgHkFriNeIrXJdRofVuv1UybJynYpht$>
>>> <
>>> https://urldefense.com/v3/__https://www.transfernow.net/dl/20240215j9NaPTc0__;!!ACWV5N9M2RV99hQ!O5j6Ri-Ostqq68q1zm71CEhSQ4CE7DqBfHZNq7cDAhU7b7CwqrnIA-ddZFaQDbOMAkgHkFriNeIrXJdRofVuv1UybJynYpht$
>>> <
>>> https://urldefense.com/v3/__https://www.transfernow.net/dl/20240215j9NaPTc0__;!!ACWV5N9M2RV99hQ!O5j6Ri-Ostqq68q1zm71CEhSQ4CE7DqBfHZNq7cDAhU7b7CwqrnIA-ddZFaQDbOMAkgHkFriNeIrXJdRofVuv1UybJynYpht$
>>> >>>
>>> >      >      >>     >
>>> >      >
>>> >       <
>>> https://urldefense.com/v3/__https://www.transfernow.net/dl/20240215j9NaPTc0__;!!ACWV5N9M2RV99hQ!MWZDuvCBsbZSYul-HLDtF_j1IBD6osBF4cBVE_bg0yM5zCqYFwzLLp7nKN3b1hq1XVFRreqUVaXiKuXjUwGbxpjjFeDXD5_-$
>>> <
>>> https://urldefense.com/v3/__https://www.transfernow.net/dl/20240215j9NaPTc0__;!!ACWV5N9M2RV99hQ!MWZDuvCBsbZSYul-HLDtF_j1IBD6osBF4cBVE_bg0yM5zCqYFwzLLp7nKN3b1hq1XVFRreqUVaXiKuXjUwGbxpjjFeDXD5_-$>
>>> <
>>> https://urldefense.com/v3/__https://www.transfernow.net/dl/20240215j9NaPTc0__;!!ACWV5N9M2RV99hQ!MWZDuvCBsbZSYul-HLDtF_j1IBD6osBF4cBVE_bg0yM5zCqYFwzLLp7nKN3b1hq1XVFRreqUVaXiKuXjUwGbxpjjFeDXD5_-$
>>> <
>>> https://urldefense.com/v3/__https://www.transfernow.net/dl/20240215j9NaPTc0__;!!ACWV5N9M2RV99hQ!MWZDuvCBsbZSYul-HLDtF_j1IBD6osBF4cBVE_bg0yM5zCqYFwzLLp7nKN3b1hq1XVFRreqUVaXiKuXjUwGbxpjjFeDXD5_-$>>
>>> <
>>> https://urldefense.com/v3/__https://www.transfernow.net/dl/20240215j9NaPTc0__;!!ACWV5N9M2RV99hQ!MWZDuvCBsbZSYul-HLDtF_j1IBD6osBF4cBVE_bg0yM5zCqYFwzLLp7nKN3b1hq1XVFRreqUVaXiKuXjUwGbxpjjFeDXD5_-$
>>> <
>>> https://urldefense.com/v3/__https://www.transfernow.net/dl/20240215j9NaPTc0__;!!ACWV5N9M2RV99hQ!MWZDuvCBsbZSYul-HLDtF_j1IBD6osBF4cBVE_bg0yM5zCqYFwzLLp7nKN3b1hq1XVFRreqUVaXiKuXjUwGbxpjjFeDXD5_-$>
>>> <
>>> https://urldefense.com/v3/__https://www.transfernow.net/dl/20240215j9NaPTc0__;!!ACWV5N9M2RV99hQ!MWZDuvCBsbZSYul-HLDtF_j1IBD6osBF4cBVE_bg0yM5zCqYFwzLLp7nKN3b1hq1XVFRreqUVaXiKuXjUwGbxpjjFeDXD5_-$
>>> <
>>> https://urldefense.com/v3/__https://www.transfernow.net/dl/20240215j9NaPTc0__;!!ACWV5N9M2RV99hQ!MWZDuvCBsbZSYul-HLDtF_j1IBD6osBF4cBVE_bg0yM5zCqYFwzLLp7nKN3b1hq1XVFRreqUVaXiKuXjUwGbxpjjFeDXD5_-$
>>> >>>>
>>> >      >      >>     >      >
>>> >     <https://www.transfernow.net/dl/20240215j9NaPTc0
>>> <https://urldefense.com/v3/__https://www.transfernow.net/dl/20240215j9NaPTc0__;!!ACWV5N9M2RV99hQ!LO8iMrNtVuMHM0elGqimqgkyKip3sUQtngpyEvIeEXo_ydu21QQ0KfHymFrv5r3aiNLd_8GiYZJTq_TmlUIg_mVrq6cVng$>
>>> >     <
>>> https://urldefense.com/v3/__https://www.transfernow.net/dl/20240215j9NaPTc0__;!!ACWV5N9M2RV99hQ!Oy8M_MVHordSb4P3bQK7FIsjr7OUWYsKxpJWW-5Hsq4QmU-5utLsNbRRM5kiyoHWE92dAWA7n38XpX68XvdBhd0HudjOaY-y$
>>> >
>>> >      >
>>> >       <
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>>> >>
>>> >      >      >>
>>> >      >
>>> >       <
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>>> <
>>> https://urldefense.com/v3/__https://www.transfernow.net/dl/20240215j9NaPTc0__;!!ACWV5N9M2RV99hQ!O5j6Ri-Ostqq68q1zm71CEhSQ4CE7DqBfHZNq7cDAhU7b7CwqrnIA-ddZFaQDbOMAkgHkFriNeIrXJdRofVuv1UybJynYpht$
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>>> >>>
>>> >      >      >>     >
>>> >      >
>>> >       <
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>>> <
>>> https://urldefense.com/v3/__https://www.transfernow.net/dl/20240215j9NaPTc0__;!!ACWV5N9M2RV99hQ!MWZDuvCBsbZSYul-HLDtF_j1IBD6osBF4cBVE_bg0yM5zCqYFwzLLp7nKN3b1hq1XVFRreqUVaXiKuXjUwGbxpjjFeDXD5_-$
>>> <
>>> https://urldefense.com/v3/__https://www.transfernow.net/dl/20240215j9NaPTc0__;!!ACWV5N9M2RV99hQ!MWZDuvCBsbZSYul-HLDtF_j1IBD6osBF4cBVE_bg0yM5zCqYFwzLLp7nKN3b1hq1XVFRreqUVaXiKuXjUwGbxpjjFeDXD5_-$>>
>>> <
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>>> https://urldefense.com/v3/__https://www.transfernow.net/dl/20240215j9NaPTc0__;!!ACWV5N9M2RV99hQ!MWZDuvCBsbZSYul-HLDtF_j1IBD6osBF4cBVE_bg0yM5zCqYFwzLLp7nKN3b1hq1XVFRreqUVaXiKuXjUwGbxpjjFeDXD5_-$>
>>> <
>>> https://urldefense.com/v3/__https://www.transfernow.net/dl/20240215j9NaPTc0__;!!ACWV5N9M2RV99hQ!MWZDuvCBsbZSYul-HLDtF_j1IBD6osBF4cBVE_bg0yM5zCqYFwzLLp7nKN3b1hq1XVFRreqUVaXiKuXjUwGbxpjjFeDXD5_-$
>>> <
>>> https://urldefense.com/v3/__https://www.transfernow.net/dl/20240215j9NaPTc0__;!!ACWV5N9M2RV99hQ!MWZDuvCBsbZSYul-HLDtF_j1IBD6osBF4cBVE_bg0yM5zCqYFwzLLp7nKN3b1hq1XVFRreqUVaXiKuXjUwGbxpjjFeDXD5_-$
>>> >>>>>
>>> >      >      >>     >      >
>>> >      >      >>     >      > You'd have to unzip into
>>> >      >      >>    bundles/sirix-core/src/test/resources/json,
>>> >      >      >>     >      > remove the @Disabled annotation and run
>>> the test
>>> >      >      >>     >      > JsonShredderTest::testChicagoDescendantAxis
>>> >      >      >>     >      >
>>> >      >      >>     >      > The test JVM parameters are specified in
>>> the
>>> >     parent
>>> >      >      >>    build.gradle
>>> >      >      >>     >     in the
>>> >      >      >>     >      > project root folder.
>>> >      >      >>     >      >
>>> >      >      >>     >      > The GitHub repo:
>>> >     https://github.com/sirixdb/sirix
>>> <https://urldefense.com/v3/__https://github.com/sirixdb/sirix__;!!ACWV5N9M2RV99hQ!LO8iMrNtVuMHM0elGqimqgkyKip3sUQtngpyEvIeEXo_ydu21QQ0KfHymFrv5r3aiNLd_8GiYZJTq_TmlUIg_mWLTIcvdA$>
>>> >     <
>>> https://urldefense.com/v3/__https://github.com/sirixdb/sirix__;!!ACWV5N9M2RV99hQ!Oy8M_MVHordSb4P3bQK7FIsjr7OUWYsKxpJWW-5Hsq4QmU-5utLsNbRRM5kiyoHWE92dAWA7n38XpX68XvdBhd0HuVPfuWFY$
>>> >
>>> >      >
>>> >       <
>>> https://urldefense.com/v3/__https://github.com/sirixdb/sirix__;!!ACWV5N9M2RV99hQ!M33-mkbNfIFidOtIRYJLrdt970BIn5XjvmSvgBg0Ip6zkm5Zk7w6OG6FunFxjzDpUZju_f7FbEua8sTaS9Q3SnufNbw9BBhL$
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>>> >>
>>> >      >      >>
>>> >      >
>>> >       <
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>>> <
>>> https://urldefense.com/v3/__https://github.com/sirixdb/sirix__;!!ACWV5N9M2RV99hQ!O5j6Ri-Ostqq68q1zm71CEhSQ4CE7DqBfHZNq7cDAhU7b7CwqrnIA-ddZFaQDbOMAkgHkFriNeIrXJdRofVuv1UybALU2RDy$
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>>> https://urldefense.com/v3/__https://github.com/sirixdb/sirix__;!!ACWV5N9M2RV99hQ!O5j6Ri-Ostqq68q1zm71CEhSQ4CE7DqBfHZNq7cDAhU7b7CwqrnIA-ddZFaQDbOMAkgHkFriNeIrXJdRofVuv1UybALU2RDy$
>>> >>>
>>> >      >      >>     >
>>> >      >
>>> >       <
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>>> <
>>> https://urldefense.com/v3/__https://github.com/sirixdb/sirix__;!!ACWV5N9M2RV99hQ!MWZDuvCBsbZSYul-HLDtF_j1IBD6osBF4cBVE_bg0yM5zCqYFwzLLp7nKN3b1hq1XVFRreqUVaXiKuXjUwGbxpjjFUUPdeUD$>
>>> <
>>> https://urldefense.com/v3/__https://github.com/sirixdb/sirix__;!!ACWV5N9M2RV99hQ!MWZDuvCBsbZSYul-HLDtF_j1IBD6osBF4cBVE_bg0yM5zCqYFwzLLp7nKN3b1hq1XVFRreqUVaXiKuXjUwGbxpjjFUUPdeUD$
>>> <
>>> https://urldefense.com/v3/__https://github.com/sirixdb/sirix__;!!ACWV5N9M2RV99hQ!MWZDuvCBsbZSYul-HLDtF_j1IBD6osBF4cBVE_bg0yM5zCqYFwzLLp7nKN3b1hq1XVFRreqUVaXiKuXjUwGbxpjjFUUPdeUD$>>
>>> <
>>> https://urldefense.com/v3/__https://github.com/sirixdb/sirix__;!!ACWV5N9M2RV99hQ!MWZDuvCBsbZSYul-HLDtF_j1IBD6osBF4cBVE_bg0yM5zCqYFwzLLp7nKN3b1hq1XVFRreqUVaXiKuXjUwGbxpjjFUUPdeUD$
>>> <
>>> https://urldefense.com/v3/__https://github.com/sirixdb/sirix__;!!ACWV5N9M2RV99hQ!MWZDuvCBsbZSYul-HLDtF_j1IBD6osBF4cBVE_bg0yM5zCqYFwzLLp7nKN3b1hq1XVFRreqUVaXiKuXjUwGbxpjjFUUPdeUD$>
>>> <
>>> https://urldefense.com/v3/__https://github.com/sirixdb/sirix__;!!ACWV5N9M2RV99hQ!MWZDuvCBsbZSYul-HLDtF_j1IBD6osBF4cBVE_bg0yM5zCqYFwzLLp7nKN3b1hq1XVFRreqUVaXiKuXjUwGbxpjjFUUPdeUD$
>>> <
>>> https://urldefense.com/v3/__https://github.com/sirixdb/sirix__;!!ACWV5N9M2RV99hQ!MWZDuvCBsbZSYul-HLDtF_j1IBD6osBF4cBVE_bg0yM5zCqYFwzLLp7nKN3b1hq1XVFRreqUVaXiKuXjUwGbxpjjFUUPdeUD$
>>> >>>>
>>> >      >      >>     >      > <https://github.com/sirixdb/sirix
>>> <https://urldefense.com/v3/__https://github.com/sirixdb/sirix__;!!ACWV5N9M2RV99hQ!LO8iMrNtVuMHM0elGqimqgkyKip3sUQtngpyEvIeEXo_ydu21QQ0KfHymFrv5r3aiNLd_8GiYZJTq_TmlUIg_mWLTIcvdA$>
>>> >     <
>>> https://urldefense.com/v3/__https://github.com/sirixdb/sirix__;!!ACWV5N9M2RV99hQ!Oy8M_MVHordSb4P3bQK7FIsjr7OUWYsKxpJWW-5Hsq4QmU-5utLsNbRRM5kiyoHWE92dAWA7n38XpX68XvdBhd0HuVPfuWFY$
>>> >
>>> >      >
>>> >       <
>>> https://urldefense.com/v3/__https://github.com/sirixdb/sirix__;!!ACWV5N9M2RV99hQ!M33-mkbNfIFidOtIRYJLrdt970BIn5XjvmSvgBg0Ip6zkm5Zk7w6OG6FunFxjzDpUZju_f7FbEua8sTaS9Q3SnufNbw9BBhL$
>>> <
>>> https://urldefense.com/v3/__https://github.com/sirixdb/sirix__;!!ACWV5N9M2RV99hQ!M33-mkbNfIFidOtIRYJLrdt970BIn5XjvmSvgBg0Ip6zkm5Zk7w6OG6FunFxjzDpUZju_f7FbEua8sTaS9Q3SnufNbw9BBhL$
>>> >>
>>> >      >      >>
>>> >      >
>>> >       <
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>>> <
>>> https://urldefense.com/v3/__https://github.com/sirixdb/sirix__;!!ACWV5N9M2RV99hQ!O5j6Ri-Ostqq68q1zm71CEhSQ4CE7DqBfHZNq7cDAhU7b7CwqrnIA-ddZFaQDbOMAkgHkFriNeIrXJdRofVuv1UybALU2RDy$>
>>> <
>>> https://urldefense.com/v3/__https://github.com/sirixdb/sirix__;!!ACWV5N9M2RV99hQ!O5j6Ri-Ostqq68q1zm71CEhSQ4CE7DqBfHZNq7cDAhU7b7CwqrnIA-ddZFaQDbOMAkgHkFriNeIrXJdRofVuv1UybALU2RDy$
>>> <
>>> https://urldefense.com/v3/__https://github.com/sirixdb/sirix__;!!ACWV5N9M2RV99hQ!O5j6Ri-Ostqq68q1zm71CEhSQ4CE7DqBfHZNq7cDAhU7b7CwqrnIA-ddZFaQDbOMAkgHkFriNeIrXJdRofVuv1UybALU2RDy$
>>> >>>
>>> >      >      >>     >
>>> >      >
>>> >       <
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>>> <
>>> https://urldefense.com/v3/__https://github.com/sirixdb/sirix__;!!ACWV5N9M2RV99hQ!MWZDuvCBsbZSYul-HLDtF_j1IBD6osBF4cBVE_bg0yM5zCqYFwzLLp7nKN3b1hq1XVFRreqUVaXiKuXjUwGbxpjjFUUPdeUD$>
>>> <
>>> https://urldefense.com/v3/__https://github.com/sirixdb/sirix__;!!ACWV5N9M2RV99hQ!MWZDuvCBsbZSYul-HLDtF_j1IBD6osBF4cBVE_bg0yM5zCqYFwzLLp7nKN3b1hq1XVFRreqUVaXiKuXjUwGbxpjjFUUPdeUD$
>>> <
>>> https://urldefense.com/v3/__https://github.com/sirixdb/sirix__;!!ACWV5N9M2RV99hQ!MWZDuvCBsbZSYul-HLDtF_j1IBD6osBF4cBVE_bg0yM5zCqYFwzLLp7nKN3b1hq1XVFRreqUVaXiKuXjUwGbxpjjFUUPdeUD$>>
>>> <
>>> https://urldefense.com/v3/__https://github.com/sirixdb/sirix__;!!ACWV5N9M2RV99hQ!MWZDuvCBsbZSYul-HLDtF_j1IBD6osBF4cBVE_bg0yM5zCqYFwzLLp7nKN3b1hq1XVFRreqUVaXiKuXjUwGbxpjjFUUPdeUD$
>>> <
>>> https://urldefense.com/v3/__https://github.com/sirixdb/sirix__;!!ACWV5N9M2RV99hQ!MWZDuvCBsbZSYul-HLDtF_j1IBD6osBF4cBVE_bg0yM5zCqYFwzLLp7nKN3b1hq1XVFRreqUVaXiKuXjUwGbxpjjFUUPdeUD$>
>>> <
>>> https://urldefense.com/v3/__https://github.com/sirixdb/sirix__;!!ACWV5N9M2RV99hQ!MWZDuvCBsbZSYul-HLDtF_j1IBD6osBF4cBVE_bg0yM5zCqYFwzLLp7nKN3b1hq1XVFRreqUVaXiKuXjUwGbxpjjFUUPdeUD$
>>> <
>>> https://urldefense.com/v3/__https://github.com/sirixdb/sirix__;!!ACWV5N9M2RV99hQ!MWZDuvCBsbZSYul-HLDtF_j1IBD6osBF4cBVE_bg0yM5zCqYFwzLLp7nKN3b1hq1XVFRreqUVaXiKuXjUwGbxpjjFUUPdeUD$
>>> >>>>>
>>> >      >      >>     >      >
>>> >      >      >>     >      > Screenshot from 2024-02-15 21-43-33.png
>>> >      >      >>     >      >
>>> >      >      >>     >      > kind regards
>>> >      >      >>     >      > Johannes
>>> >      >      >>     >      >
>>> >      >      >>     >      > Am Do., 15. Feb. 2024 um 20:01 Uhr schrieb
>>> >     Peter Booth
>>> >      >      >>     >      > <peter_booth at me.com
>>> >     <mailto:peter_booth at me.com> <mailto:peter_booth at me.com
>>> >     <mailto:peter_booth at me.com>>
>>> >      >     <mailto:peter_booth at me.com <mailto:peter_booth at me.com>
>>> >     <mailto:peter_booth at me.com <mailto:peter_booth at me.com>>>
>>> >      >      >>    <mailto:peter_booth at me.com <mailto:
>>> peter_booth at me.com>
>>> >     <mailto:peter_booth at me.com <mailto:peter_booth at me.com>>
>>> >      >     <mailto:peter_booth at me.com <mailto:peter_booth at me.com>
>>> >     <mailto:peter_booth at me.com <mailto:peter_booth at me.com>>>>
>>> >      >      >>     >     <mailto:peter_booth at me.com
>>> >     <mailto:peter_booth at me.com> <mailto:peter_booth at me.com
>>> >     <mailto:peter_booth at me.com>>
>>> >      >     <mailto:peter_booth at me.com <mailto:peter_booth at me.com>
>>> >     <mailto:peter_booth at me.com <mailto:peter_booth at me.com>>>
>>> >      >      >>    <mailto:peter_booth at me.com <mailto:
>>> peter_booth at me.com>
>>> >     <mailto:peter_booth at me.com <mailto:peter_booth at me.com>>
>>> >      >     <mailto:peter_booth at me.com <mailto:peter_booth at me.com>
>>> >     <mailto:peter_booth at me.com <mailto:peter_booth at me.com>>>>>>:
>>> >      >      >>     >      >
>>> >      >      >>     >      >     Just curious - what CPU, physical
>>> memory
>>> >     and OS are
>>> >      >      >>    you using?
>>> >      >      >>     >      >     Sent from my iPhone
>>> >      >      >>     >      >
>>> >      >      >>     >      >>     On Feb 15, 2024, at 12:23 PM, Johannes
>>> >      >     Lichtenberger
>>> >      >      >>     >      >>     <lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>
>>> >      >     <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>>
>>> >      >      >>    <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>
>>> >      >     <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>>>
>>> >      >      >>     >     <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>
>>> >      >     <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>>
>>> >      >      >>    <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>
>>> >      >     <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>>>>
>>> >      >      >>     >      >>
>>> >       <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>
>>> >      >     <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>>
>>> >      >      >>    <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>
>>> >      >     <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>>>
>>> >      >      >>     >     <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>
>>> >      >     <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>>
>>> >      >      >>    <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>
>>> >      >     <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>>>>>> wrote:
>>> >      >      >>     >      >>
>>> >      >      >>     >      >>     
>>> >      >      >>     >      >>     I guess I don't know which JDK it
>>> picks
>>> >     for the
>>> >      >      >>    tests, but I
>>> >      >      >>     >     guess
>>> >      >      >>     >      >>     OpenJDK
>>> >      >      >>     >      >>
>>> >      >      >>     >      >>     Johannes Lichtenberger
>>> >      >      >>    <lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>
>>> >      >     <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>>
>>> >      >      >>    <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>
>>> >      >     <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>>>
>>> >      >      >>     >     <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>
>>> >      >     <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>>
>>> >      >      >>    <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>
>>> >      >     <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>>>>
>>> >      >      >>     >      >>
>>> >       <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>
>>> >      >     <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>>
>>> >      >      >>    <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>
>>> >      >     <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>>>
>>> >      >      >>     >     <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>
>>> >      >     <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>>
>>> >      >      >>    <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>
>>> >      >     <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>>>>>> schrieb am Do., 15.
>>> >      >      >>     >      >>     Feb. 2024, 17:58:
>>> >      >      >>     >      >>
>>> >      >      >>     >      >>         However, it's the same with:
>>> ./gradlew
>>> >      >      >>     >      >>
>>> >      >       -Dorg.gradle.java.home=/home/johannes/.jdks/openjdk-21.0.2
>>> >      >      >>     >      >>         :sirix-core:test --tests
>>> >      >      >>     >      >>
>>> >      >      >>     >
>>> >      >
>>> >
>>>  io.sirix.service.json.shredder.JsonShredderTest.testChicagoDescendantAxis
>>>  using OpenJDK hopefully
>>> >      >      >>     >      >>
>>> >      >      >>     >      >>         Am Do., 15. Feb. 2024 um 17:54 Uhr
>>> >     schrieb
>>> >      >     Johannes
>>> >      >      >>     >      >>         Lichtenberger
>>> >      >     <lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>
>>> >      >     <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>>
>>> >      >      >>    <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>
>>> >      >     <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>>>
>>> >      >      >>     >     <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>
>>> >      >     <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>>
>>> >      >      >>    <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>
>>> >      >     <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>>>>
>>> >      >      >>     >      >>
>>> >       <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>
>>> >      >     <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>>
>>> >      >      >>    <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>
>>> >      >     <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>>>
>>> >      >      >>     >     <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>
>>> >      >     <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>>
>>> >      >      >>    <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>
>>> >      >     <mailto:lichtenberger.johannes at gmail.com
>>> >     <mailto:lichtenberger.johannes at gmail.com>>>>>>:
>>> >      >      >>     >      >>
>>> >      >      >>     >      >>             I've attached two logs, the
>>> >     first one
>>> >      >     without
>>> >      >      >>     >      >>             -XX:+Generational, the second
>>> >     one with the
>>> >      >      >>    option set,
>>> >      >      >>     >      >>             even though I also saw, that
>>> >      >     generational ZGC is
>>> >      >      >>     >     going to
>>> >      >      >>     >      >>             be supported in GraalVM 24.1
>>> in
>>> >      >     September...
>>> >      >      >>    so not sure
>>> >      >      >>     >      >>             what this does :)
>>> >      >      >>     >      >>
>>> >      >      >>     >      >>             Am Do., 15. Feb. 2024 um 17:52
>>> >     Uhr schrieb
>>> >      >      >>    Johannes
>>> >      >      >>     >      >>             Lichtenberger
>>> >      >      >>    <lichtenberger.johannes at gmail.com
>>>
>>
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