problem with ClassLayout.parseClass

[Nezih Yigitbasi]

Not that urgent, a release this week or early next week would be awesome.

On Wed, Nov 5, 2014 at 12:56 PM, Aleksey Shipilev <
aleksey.shipilev at oracle.com> wrote:

> Excellent. It has been a while since last release, might be this week.
> How important is this for you?
>
> -Aleksey.
>
> On 05.11.2014 23:52, Nezih Yigitbasi wrote:
> > Yep the problem is fixed with your latest change. Thanks for the quick
> > fix. When can you push a new release to the maven central repo?
> >
> > On Wed, Nov 5, 2014 at 12:41 PM, Aleksey Shipilev
> > <aleksey.shipilev at oracle.com <mailto:aleksey.shipilev at oracle.com>>
> wrote:
> >
> >     On 05.11.2014 23:27, Aleksey Shipilev wrote:
> >     > Hi Nezih,
> >     >
> >     > On 05.11.2014 22:33, Nezih Yigitbasi wrote:
> >     >> We are seeing a weird GC problem with the jol library with the
> >     >> ClassLayout.parseClass() call. The problem is that the calling
> >     >> thread spends a lot of time doing full GCs and it’s kind of stuck
> in
> >     >> a GC loop. We only observed this problem with the
> >     >> -XX:+UseConcMarkSweepGC and -XX:+ExplicitGCInvokesConcurrent flags
> >     >> where the explicit System.gc() call in the
> VMSupport.guessAlignment()
> >     >> method cause full GCs that are very slow (when these flags are
> >     >> removed I see less number of full GCs that are much faster and I
> >     >> don’t see the problem anymore). This seemed like a bug to me, but
> I
> >     >> just wanted to check with you to understand it better.
> >     >
> >     > Well, that code is running once during the initialization, and it
> does
> >     > indeed calls for GC to condense the newly allocated array with
> objects
> >     > to better estimate the alignment.
> >     >
> >     > I would agree that unexpected System.gc coming from a library is a
> >     > library bug, and therefore we can revisit this, filed:
> >     >   https://bugs.openjdk.java.net/browse/CODETOOLS-7901085
> >
> >     Should be fixed now with:
> >       http://hg.openjdk.java.net/code-tools/jol/rev/c58aecad901f
> >
> >     Can you confirm?
> >
> >     -Aleksey.
> >
> >
>
>
>