RFR (M): 8207266: ThreadMXBean::getThreadAllocatedBytes() can be quicker for self thread
Daniel D. Daugherty
daniel.daugherty at oracle.com
Thu Sep 19 01:08:11 UTC 2019
We should probably repurpose
JDK-8231209 Many com.sun.management.ThreadMXBean test failures
after 8207266
as your REDO bug.
Dan
On 9/18/19 9:05 PM, Hohensee, Paul wrote:
> +1, thanks!
>
> My apologies for the bad patch. I'll file another issue and run every test that mentions ThreadMXBean. At least, I know how to revert a patch now.
>
> Paul
>
> On 9/18/19, 6:00 PM, "David Holmes" <david.holmes at oracle.com> wrote:
>
> Ship it!
>
> Thanks Dan!
>
> David
>
> On 19/09/2019 10:53 am, Daniel D. Daugherty wrote:
> > Looks like the issue is different versions of 'hg' in use.
> >
> > When I import Paul's patch from his webrev using my 'hg' and
> > then export it again, it matches my version of the backout.
> >
> > I have done a mechanical verification that the backout is an
> > exact reversal for Paul's original changeset.
> >
> > I'm planning to push the changeset with the following info:
> >
> >
> > 8231210: [BACKOUT] JDK-8207266 ThreadMXBean::getThreadAllocatedBytes()
> > can be quicker for self thread
> > Reviewed-by: phh, dholmes
> >
> > Everyone good with this?
> >
> > Dan
> >
> > On 9/18/19 8:44 PM, Daniel D. Daugherty wrote:
> >> For some reason, the backout that I did does not match the backout
> >> that you did so I'm trying to figure that out.
> >>
> >> Dan
> >>
> >>
> >>
> >> On 9/18/19 8:36 PM, Hohensee, Paul wrote:
> >>> And I filed 8231211 for the same thing. :)
> >>>
> >>> Yes, please handle it, because it will go faster since I don't have
> >>> access to a fast machine (just my laptop).
> >>>
> >>> Webrev here:
> >>>
> >>> http://cr.openjdk.java.net/~phh/8231211/webrev.00/
> >>>
> >>> Thanks,
> >>>
> >>> On 9/18/19, 5:25 PM, "Daniel D. Daugherty"
> >>> <daniel.daugherty at oracle.com> wrote:
> >>>
> >>> I created this sub-task for you:
> >>> JDK-8231210 [BACKOUT] JDK-8207266
> >>> ThreadMXBean::getThreadAllocatedBytes() can be quicker for self
> >>> thread
> >>> https://bugs.openjdk.java.net/browse/JDK-8231210
> >>> If you would prefer, I can handle this backout for you.
> >>> Dan
> >>> On 9/18/19 8:21 PM, Hohensee, Paul wrote:
> >>> > Never having done this before, is it
> >>> >
> >>> > hg backout -r <original commit id>
> >>> >
> >>> > ? Do I file a JBS issue for the reversion? Seems necessary.
> >>> >
> >>> > On 9/18/19, 5:18 PM, "Daniel D. Daugherty"
> >>> <daniel.daugherty at oracle.com> wrote:
> >>> >
> >>> > % hg backout
> >>> >
> >>> > is the usual way to do this...
> >>> >
> >>> > Dan
> >>> >
> >>> >
> >>> > On 9/18/19 8:17 PM, Hohensee, Paul wrote:
> >>> > > Is there a tool that will generate a reversal patch?
> >>> > >
> >>> > > On 9/18/19, 5:14 PM, "Daniel D. Daugherty"
> >>> <daniel.daugherty at oracle.com> wrote:
> >>> > >
> >>> > > > Shall I go with that, or reverse the original
> >>> patch?
> >>> > >
> >>> > > I'm a bit worried about what else might show up
> >>> since the
> >>> > > NSK monitoring tests were not run prior to this push.
> >>> > >
> >>> > > I vote for backing out the fix until proper
> >>> testing has
> >>> > > been done (and at least the one problem fixed...)
> >>> > >
> >>> > > Dan
> >>> > >
> >>> > >
> >>> > > On 9/18/19 8:00 PM, Hohensee, Paul wrote:
> >>> > > > They all implement
> >>> com.sun.management.ThreadMXBean, so adding a
> >>> getCurrentThreadAllocatedBytes broke them. Potential fix is to give
> >>> it a default implementation, vis
> >>> > > >
> >>> > > > public default long
> >>> getCurrentThreadAllocatedBytes() {
> >>> > > > return -1;
> >>> > > > }
> >>> > > >
> >>> > > > Shall I go with that, or reverse the original
> >>> patch?
> >>> > > >
> >>> > > > On 9/18/19, 4:48 PM, "serviceability-dev on
> >>> behalf of Hohensee, Paul"
> >>> <serviceability-dev-bounces at openjdk.java.net on behalf of
> >>> hohensee at amazon.com> wrote:
> >>> > > >
> >>> > > > I'll take a look.
> >>> > > >
> >>> > > > On 9/18/19, 4:40 PM, "David Holmes"
> >>> <david.holmes at oracle.com> wrote:
> >>> > > >
> >>> > > > Paul,
> >>> > > >
> >>> > > > Unfortunately this patch has broken the
> >>> vmTestbase/nsk/monitoring tests:
> >>> > > >
> >>> > > > [2019-09-18T22:59:32,349Z]
> >>> > > >
> >>> /scratch/mesos/jib-master/install/jdk-14+15-615/src.full/open/test/hotspot/jtreg/vmTestbase/nsk/monitoring/share/server/ServerThreadMXBeanNew.java:32:
> >>>
> >>> > > > error: ServerThreadMXBeanNew is not
> >>> abstract and does not override
> >>> > > > abstract method
> >>> getCurrentThreadAllocatedBytes() in ThreadMXBean
> >>> > > >
> >>> > > > and possibly other issues as we are
> >>> seeing hundreds of failures.
> >>> > > >
> >>> > > > David
> >>> > > >
> >>> > > > On 18/09/2019 8:50 am, David Holmes wrote:
> >>> > > > > On 18/09/2019 12:10 am, Hohensee,
> >>> Paul wrote:
> >>> > > > >> Thanks, Serguei. :)
> >>> > > > >>
> >>> > > > >> David, are you ok with the patch?
> >>> > > > >
> >>> > > > > Yep, nothing further from me.
> >>> > > > >
> >>> > > > > David
> >>> > > > >
> >>> > > > >> Paul
> >>> > > > >>
> >>> > > > >> *From: *"serguei.spitsyn at oracle.com"
> >>> <serguei.spitsyn at oracle.com>
> >>> > > > >> *Date: *Tuesday, September 17, 2019
> >>> at 2:26 AM
> >>> > > > >> *To: *"Hohensee, Paul"
> >>> <hohensee at amazon.com>, David Holmes
> >>> > > > >> <david.holmes at oracle.com>, Mandy
> >>> Chung <mandy.chung at oracle.com>
> >>> > > > >> *Cc: *OpenJDK Serviceability
> >>> <serviceability-dev at openjdk.java.net>,
> >>> > > > >> "hotspot-gc-dev at openjdk.java.net"
> >>> <hotspot-gc-dev at openjdk.java.net>
> >>> > > > >> *Subject: *Re: RFR (M): 8207266:
> >>> > > > >>
> >>> ThreadMXBean::getThreadAllocatedBytes() can be quicker for self thread
> >>> > > > >>
> >>> > > > >> Hi Paul,
> >>> > > > >>
> >>> > > > >> Thank you for refactoring and fixing
> >>> the test.
> >>> > > > >> It looks great now!
> >>> > > > >>
> >>> > > > >> Thanks,
> >>> > > > >> Serguei
> >>> > > > >>
> >>> > > > >>
> >>> > > > >> On 9/15/19 02:52, Hohensee, Paul wrote:
> >>> > > > >>
> >>> > > > >> Hi, Serguei, thanks for the
> >>> review. New webrev at
> >>> > > > >>
> >>> > > > >>
> >>> http://cr.openjdk.java.net/~phh/8207266/webrev.09/
> >>> > > > >>
> >>> > > > >> I refactored the test’s main()
> >>> method, and you’re correct,
> >>> > > > >> getThreadAllocatedBytes should be
> >>> getCurrentThreadAllocatedBytes in
> >>> > > > >> that context: fixed.
> >>> > > > >>
> >>> > > > >> Paul
> >>> > > > >>
> >>> > > > >> *From:
> >>> *"serguei.spitsyn at oracle.com"
> >>> > > > >> <mailto:serguei.spitsyn at oracle.com>
> >>> <serguei.spitsyn at oracle.com>
> >>> > > > >> <mailto:serguei.spitsyn at oracle.com>
> >>> > > > >> *Organization: *Oracle Corporation
> >>> > > > >> *Date: *Friday, September 13,
> >>> 2019 at 5:50 PM
> >>> > > > >> *To: *"Hohensee, Paul"
> >>> <hohensee at amazon.com>
> >>> > > > >> <mailto:hohensee at amazon.com>, David
> >>> Holmes <david.holmes at oracle.com>
> >>> > > > >> <mailto:david.holmes at oracle.com>,
> >>> Mandy Chung
> >>> > > > >> <mandy.chung at oracle.com>
> >>> <mailto:mandy.chung at oracle.com>
> >>> > > > >> *Cc: *OpenJDK Serviceability
> >>> <serviceability-dev at openjdk.java.net>
> >>> > > > >>
> >>> <mailto:serviceability-dev at openjdk.java.net>,
> >>> > > > >> "hotspot-gc-dev at openjdk.java.net"
> >>> > > > >>
> >>> <mailto:hotspot-gc-dev at openjdk.java.net>
> >>> > > > >> <hotspot-gc-dev at openjdk.java.net>
> >>> > > > >>
> >>> <mailto:hotspot-gc-dev at openjdk.java.net>
> >>> > > > >> *Subject: *Re: RFR (M): 8207266:
> >>> > > > >>
> >>> ThreadMXBean::getThreadAllocatedBytes() can be quicker for self
> >>> > > > >> thread
> >>> > > > >>
> >>> > > > >> Hi Paul,
> >>> > > > >>
> >>> > > > >> It looks pretty good in general.
> >>> > > > >>
> >>> > > > >>
> >>> > > > >>
> >>> http://cr.openjdk.java.net/~phh/8207266/webrev.08/test/jdk/com/sun/management/ThreadMXBean/ThreadAllocatedMemory.java.frames.html
> >>>
> >>> > > > >>
> >>> > > > >>
> >>> > > > >> It would be nice to refactor the
> >>> java main() method as it becomes
> >>> > > > >> too big.
> >>> > > > >> Two ways
> >>> ofgetCurrentThreadAllocatedBytes() testing are good
> >>> > > > >> candidates
> >>> > > > >> to become separate methods.
> >>> > > > >>
> >>> > > > >> 98 long size1 =
> >>> mbean.getThreadAllocatedBytes(id);
> >>> > > > >>
> >>> > > > >> Just wanted to double check if
> >>> you wanted to invoke
> >>> > > > >> the
> >>> getCurrentThreadAllocatedBytes() instead as it is
> >>> > > > >> a part of:
> >>> > > > >>
> >>> > > > >> 85 // First way,
> >>> getCurrentThreadAllocatedBytes
> >>> > > > >>
> >>> > > > >>
> >>> > > > >> Thanks,
> >>> > > > >> Serguei
> >>> > > > >>
> >>> > > > >> On 9/13/19 12:11 PM, Hohensee,
> >>> Paul wrote:
> >>> > > > >>
> >>> > > > >> Hi David, thanks for your
> >>> comments. New webrev in
> >>> > > > >>
> >>> > > > >>
> >>> > > > >>
> >>> http://cr.openjdk.java.net/~phh/8207266/webrev.08/
> >>> > > > >>
> >>> > > > >>
> >>> > > > >> Both the old and new
> >>> versions of the code check that thread
> >>> > > > >> allocated memory is both supported
> >>> and enabled. The existing version
> >>> > > > >> of getThreadAllocatedBytes(long [])
> >>> calls
> >>> > > > >> verifyThreadAllocatedMemory(long
> >>> []), which checks inline to make sure
> >>> > > > >> thread allocated memory is
> >>> supported, then calls
> >>> > > > >> isThreadAllocatedMemoryEnabled() to
> >>> verify that it's enabled.
> >>> > > > >> isThreadAllocatedMemoryEnabled()
> >>> duplicates (!) the support check and
> >>> > > > >> returns the enabled flag. I removed
> >>> the redundant check in the new
> >>> > > > >> version.
> >>> > > > >>
> >>> > > > >>
> >>> > > > >> You're of course correct
> >>> about the back-to-back check.
> >>> > > > >> Application code can't know when the
> >>> runtime will hijack a thread for
> >>> > > > >> its own purposes. I've removed the
> >>> check.
> >>> > > > >>
> >>> > > > >>
> >>> > > > >> Paul
> >>> > > > >>
> >>> > > > >>
> >>> > > > >> On 9/13/19, 12:50 AM, "David
> >>> Holmes"<david.holmes at oracle.com>
> >>> > > > >> <mailto:david.holmes at oracle.com> wrote:
> >>> > > > >>
> >>> > > > >>
> >>> > > > >> Hi Paul,
> >>> > > > >>
> >>> > > > >>
> >>> > > > >> On 13/09/2019 10:29 am,
> >>> Hohensee, Paul wrote:
> >>> > > > >>
> >>> > > > >> > Thanks for clarifying the review
> >>> rules. Would someone
> >>> > > > >> from the
> >>> > > > >>
> >>> > > > >> > serviceability team please review?
> >>> New webrev at
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >>
> >>> >http://cr.openjdk.java.net/~phh/8207266/webrev.07/
> >>> > > > >>
> >>> > > > >>
> >>> > > > >> One aspect of the
> >>> functional change needs clarification
> >>> > > > >> for me - and
> >>> > > > >>
> >>> > > > >> apologies if this has been covered
> >>> in the past. It seems
> >>> > > > >> to me that
> >>> > > > >>
> >>> > > > >> currently we only check
> >>> isThreadAllocatedMemorySupported
> >>> > > > >> for these
> >>> > > > >>
> >>> > > > >> operations, but if I read things
> >>> correctly the updated
> >>> > > > >> code additionally
> >>> > > > >>
> >>> > > > >> checks
> >>> isThreadAllocatedMemoryEnabled, which is a
> >>> > > > >> behaviour change not
> >>> > > > >>
> >>> > > > >> mentioned in the CSR.
> >>> > > > >>
> >>> > > > >>
> >>> > > > >> > I didn’t disturb the existing
> >>> checks in the test, just
> >>> > > > >> added code to
> >>> > > > >>
> >>> > > > >> > check the result of
> >>> getThreadAllocatedBytes(long) on a
> >>> > > > >> non-current
> >>> > > > >>
> >>> > > > >> > thread, plus the back-to-back
> >>> no-allocation checks. The
> >>> > > > >> former wasn’t
> >>> > > > >>
> >>> > > > >> > needed before because
> >>> getThreadAllocatedBytes(long) was
> >>> > > > >> just a wrapper
> >>> > > > >>
> >>> > > > >> > around
> >>> getThreadAllocatedBytes(long []). This patch
> >>> > > > >> changes that, so I
> >>> > > > >>
> >>> > > > >> > added a separate test. The latter
> >>> is supposed to fail
> >>> > > > >> if there’s object
> >>> > > > >>
> >>> > > > >> > allocation on calls to
> >>> getCurrentThreadAllocatedBytes and
> >>> > > > >>
> >>> > > > >> > getThreadAllocatedBytes(long).
> >>> I.e., a feature, not a
> >>> > > > >> bug, because
> >>> > > > >>
> >>> > > > >> > accumulation of transient small
> >>> objects can be a
> >>> > > > >> performance problem.
> >>> > > > >>
> >>> > > > >> > Thanks to your review, I noticed
> >>> that the back-to-back
> >>> > > > >> check on the
> >>> > > > >>
> >>> > > > >> > current thread was using
> >>> getThreadAllocatedBytes(long)
> >>> > > > >> instead of
> >>> > > > >>
> >>> > > > >> > getCurrentThreadAllocatedBytes and
> >>> fixed it. I also
> >>> > > > >> removed all
> >>> > > > >>
> >>> > > > >> > instances of “TEST FAILED: “.
> >>> > > > >>
> >>> > > > >>
> >>> > > > >> The back-to-back check
> >>> is not valid in general. You don't
> >>> > > > >> know if the
> >>> > > > >>
> >>> > > > >> first check might trigger some class
> >>> loading on the
> >>> > > > >> return path after it
> >>> > > > >>
> >>> > > > >> has obtained the first
> >>> memory value. The check might also
> >>> > > > >> fail if using
> >>> > > > >>
> >>> > > > >> JVMCI and some compilation related
> >>> activity occurs in the
> >>> > > > >> current thread
> >>> > > > >>
> >>> > > > >> on the second call.
> >>> Also with the introduction of
> >>> > > > >> handshakes its
> >>> > > > >>
> >>> > > > >> possible the current thread might
> >>> hit a safepoint checks
> >>> > > > >> that results in
> >>> > > > >>
> >>> > > > >> it executing a
> >>> handshake operation that performs
> >>> > > > >> allocation. Potentially
> >>> > > > >>
> >>> > > > >> there could be numerous
> >>> non-deterministic actions that
> >>> > > > >> might occur
> >>> > > > >>
> >>> > > > >> leading to unanticipated allocation.
> >>> > > > >>
> >>> > > > >>
> >>> > > > >> I understand what you
> >>> want to test here, I just don't
> >>> > > > >> think it is
> >>> > > > >>
> >>> > > > >> reliably doable.
> >>> > > > >>
> >>> > > > >>
> >>> > > > >> Thanks,
> >>> > > > >>
> >>> > > > >> David
> >>> > > > >>
> >>> > > > >> -----
> >>> > > > >>
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >> > Paul
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >> > *From: *Mandy
> >>> Chung<mandy.chung at oracle.com>
> >>> > > > >> <mailto:mandy.chung at oracle.com>
> >>> > > > >>
> >>> > > > >> > *Date: *Thursday, September 12,
> >>> 2019 at 10:09 AM
> >>> > > > >>
> >>> > > > >> > *To: *"Hohensee,
> >>> Paul"<hohensee at amazon.com>
> >>> > > > >> <mailto:hohensee at amazon.com>
> >>> > > > >>
> >>> > > > >> > *Cc: *OpenJDK
> >>> > > > >>
> >>> Serviceability<serviceability-dev at openjdk.java.net>
> >>> > > > >>
> >>> <mailto:serviceability-dev at openjdk.java.net>,
> >>> > > > >>
> >>> > > > >> >"hotspot-gc-dev at openjdk.java.net"
> >>> > > > >>
> >>> <mailto:hotspot-gc-dev at openjdk.java.net>
> >>> > > > >> <hotspot-gc-dev at openjdk.java.net>
> >>> > > > >>
> >>> <mailto:hotspot-gc-dev at openjdk.java.net>
> >>> > > > >>
> >>> > > > >> > *Subject: *Re: RFR (M): 8207266:
> >>> > > > >> ThreadMXBean::getThreadAllocatedBytes()
> >>> > > > >>
> >>> > > > >> > can be quicker for self thread
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >> > On 9/3/19 12:38 PM, Hohensee, Paul
> >>> wrote:
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >> > Minor update in new
> >>> > > > >>
> >>> webrevhttp://cr.openjdk.java.net/~phh/8207266/webrev.05/.
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >> > I only reviewed the library side
> >>> implementation that
> >>> > > > >> looks good. I
> >>> > > > >>
> >>> > > > >> > expect the serviceability team to
> >>> review the test and
> >>> > > > >> hotspot change.
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >> > Need a confirmatory review to
> >>> push this. If I
> >>> > > > >> understand the rules correctly, it
> >>> doesn't need a Reviewer review
> >>> > > > >> since Mandy's already reviewed it,
> >>> it just needs a Committer review.
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >> > You need another reviewer to
> >>> advice the following
> >>> > > > >> because I was not
> >>> > > > >>
> >>> > > > >> > close to the ThreadsList work.
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >> > 2087 ThreadsListHandle tlh;
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >> > 2088 JavaThread* java_thread =
> >>> > > > >>
> >>> tlh.list()->find_JavaThread_from_java_tid(thread_id);
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >> > 2089
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >> > 2090 if (java_thread != NULL) {
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >> > 2091 return
> >>> java_thread->cooked_allocated_bytes();
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >> > 2092 }
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >> > This looks right to me.
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> test/jdk/com/sun/management/ThreadMXBean/ThreadAllocatedMemory.java
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >> > - "ThreadAllocatedMemory is
> >>> expected to
> >>> > > > >> be disabled");
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >> > + "TEST FAILED:
> >>> ThreadAllocatedMemory is
> >>> > > > >> expected to be
> >>> > > > >>
> >>> > > > >> > disabled");
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >> > Prepending "TEST FAILED" in
> >>> exception message (in
> >>> > > > >> several places)
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >> > seems redundant since such
> >>> RuntimeException is thrown
> >>> > > > >> and expected
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >> > a test failure.
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >> > + // back-to-back calls
> >>> shouldn't allocate any
> >>> > > > >> memory
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >> > + size =
> >>> mbean.getThreadAllocatedBytes(id);
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >> > + size1 =
> >>> mbean.getThreadAllocatedBytes(id);
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >> > + if (size1 != size) {
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >> > Is there anything in the test can
> >>> do to help guarantee
> >>> > > > >> this? I didn't
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >> > closely review this test. The
> >>> main thing I advice is
> >>> > > > >> to improve
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >> > the reliability of this test. Put
> >>> it in another way,
> >>> > > > >> we want to
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >> > ensure that this test change will
> >>> pass all the time in
> >>> > > > >> various
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >> > test configuration.
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >> > Mandy
> >>> > > > >>
> >>> > > > >> >
> >>> > > > >>
> >>> > > > >>
> >>> > > > >>
> >>> > > > >>
> >>> > > > >>
> >>> > > >
> >>> > > >
> >>> > > >
> >>> > > >
> >>> > >
> >>> > >
> >>> > >
> >>> >
> >>> >
> >>> >
> >>>
> >>
> >
>
>
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