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Re: [jgit-dev] JGit - constant 100% CPU usage in MyersDiff
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Hi,
I personally have not seen the inifinite loop but I think Shawn was
once hunting for such a problem. See here:
http://code.google.com/p/gerrit/issues/detail?id=487
Ciao
Chris
On Fri, Nov 12, 2010 at 17:36, Zivkov, Sasa <sasa.zivkov@xxxxxxx> wrote:
> On our internal Gerrit system I found out that Gerrit process is constantly using 100% of CPU.
> Using Gerrit 2.1.5.
>
> Using "top -H" and creating several thread dumps I found that the java thread that is
> consuming the CPU is always doing something in MyersDiff class.
>
> Here a few examples from a few thread dumps:
> "HTTP-23" prio=10 tid=0x00007f084c6c2800 nid=0x2cf8 runnable [0x00007f084b5ea000]
> java.lang.Thread.State: RUNNABLE
> at org.eclipse.jgit.diff.MyersDiff$MiddleEdit$ForwardEditPaths.snake(MyersDiff.java:439)
> at org.eclipse.jgit.diff.MyersDiff$MiddleEdit$EditPaths.calculate(MyersDiff.java:394)
> at org.eclipse.jgit.diff.MyersDiff$MiddleEdit.calculate(MyersDiff.java:240)
> at org.eclipse.jgit.diff.MyersDiff.calculateEdits(MyersDiff.java:168)
> at org.eclipse.jgit.diff.MyersDiff.calculateEdits(MyersDiff.java:155)
> at org.eclipse.jgit.diff.MyersDiff.<init>(MyersDiff.java:130)
> at com.google.gerrit.server.patch.PatchListCacheImpl$Loader.newEntry(PatchListCacheImpl.java:345)
> at com.google.gerrit.server.patch.PatchListCacheImpl$Loader.newEntry(PatchListCacheImpl.java:323)
> at com.google.gerrit.server.patch.PatchListCacheImpl$Loader.readPatchList(PatchListCacheImpl.java:257)
> at com.google.gerrit.server.patch.PatchListCacheImpl$Loader.createEntry(PatchListCacheImpl.java:180)
> at com.google.gerrit.server.patch.PatchListCacheImpl$Loader.createEntry(PatchListCacheImpl.java:166)
> at com.google.gerrit.server.cache.PopulatingCache$1.createEntry(PopulatingCache.java:55)
> ...
>
> ...some minutes later...
> "HTTP-23" prio=10 tid=0x00007f084c6c2800 nid=0x2cf8 runnable [0x00007f084b5ea000]
> java.lang.Thread.State: RUNNABLE
> at org.eclipse.jgit.diff.MyersDiff$MiddleEdit$EditPaths.getX(MyersDiff.java:306)
> at org.eclipse.jgit.diff.MyersDiff$MiddleEdit$BackwardEditPaths.meets(MyersDiff.java:513)
> at org.eclipse.jgit.diff.MyersDiff$MiddleEdit$EditPaths.calculate(MyersDiff.java:425)
> at org.eclipse.jgit.diff.MyersDiff$MiddleEdit.calculate(MyersDiff.java:240)
> at org.eclipse.jgit.diff.MyersDiff.calculateEdits(MyersDiff.java:168)
> at org.eclipse.jgit.diff.MyersDiff.calculateEdits(MyersDiff.java:155)
> at org.eclipse.jgit.diff.MyersDiff.<init>(MyersDiff.java:130)
> at com.google.gerrit.server.patch.PatchListCacheImpl$Loader.newEntry(PatchListCacheImpl.java:345)
> at com.google.gerrit.server.patch.PatchListCacheImpl$Loader.newEntry(PatchListCacheImpl.java:323)
> at com.google.gerrit.server.patch.PatchListCacheImpl$Loader.readPatchList(PatchListCacheImpl.java:257)
> at com.google.gerrit.server.patch.PatchListCacheImpl$Loader.createEntry(PatchListCacheImpl.java:180)
> at com.google.gerrit.server.patch.PatchListCacheImpl$Loader.createEntry(PatchListCacheImpl.java:166)
> ...
>
> "HTTP-23" prio=10 tid=0x00007f084c6c2800 nid=0x2cf8 runnable [0x00007f084b5ea000]
> java.lang.Thread.State: RUNNABLE
> at org.eclipse.jgit.diff.MyersDiff$MiddleEdit$EditPaths.calculate(MyersDiff.java:425)
> at org.eclipse.jgit.diff.MyersDiff$MiddleEdit.calculate(MyersDiff.java:240)
> at org.eclipse.jgit.diff.MyersDiff.calculateEdits(MyersDiff.java:168)
> at org.eclipse.jgit.diff.MyersDiff.calculateEdits(MyersDiff.java:155)
> at org.eclipse.jgit.diff.MyersDiff.<init>(MyersDiff.java:130)
> at com.google.gerrit.server.patch.PatchListCacheImpl$Loader.newEntry(PatchListCacheImpl.java:345)
> at com.google.gerrit.server.patch.PatchListCacheImpl$Loader.newEntry(PatchListCacheImpl.java:323)
> at com.google.gerrit.server.patch.PatchListCacheImpl$Loader.readPatchList(PatchListCacheImpl.java:257)
> at com.google.gerrit.server.patch.PatchListCacheImpl$Loader.createEntry(PatchListCacheImpl.java:180)
> at com.google.gerrit.server.patch.PatchListCacheImpl$Loader.createEntry(PatchListCacheImpl.java:166)
> at com.google.gerrit.server.cache.PopulatingCache$1.createEntry(PopulatingCache.java:55)
> ...
>
>
> "HTTP-23" prio=10 tid=0x00007f084c6c2800 nid=0x2cf8 runnable [0x00007f084b5ea000]
> java.lang.Thread.State: RUNNABLE
> at org.eclipse.jgit.diff.MyersDiff$MiddleEdit$BackwardEditPaths.snake(MyersDiff.java:481)
> at org.eclipse.jgit.diff.MyersDiff$MiddleEdit$EditPaths.calculate(MyersDiff.java:394)
> at org.eclipse.jgit.diff.MyersDiff$MiddleEdit.calculate(MyersDiff.java:240)
> at org.eclipse.jgit.diff.MyersDiff.calculateEdits(MyersDiff.java:168)
> at org.eclipse.jgit.diff.MyersDiff.calculateEdits(MyersDiff.java:155)
> at org.eclipse.jgit.diff.MyersDiff.<init>(MyersDiff.java:130)
> at com.google.gerrit.server.patch.PatchListCacheImpl$Loader.newEntry(PatchListCacheImpl.java:345)
> at com.google.gerrit.server.patch.PatchListCacheImpl$Loader.newEntry(PatchListCacheImpl.java:323)
> at com.google.gerrit.server.patch.PatchListCacheImpl$Loader.readPatchList(PatchListCacheImpl.java:257)
> at com.google.gerrit.server.patch.PatchListCacheImpl$Loader.createEntry(PatchListCacheImpl.java:180)
> at com.google.gerrit.server.patch.PatchListCacheImpl$Loader.createEntry(PatchListCacheImpl.java:166)
> at com.google.gerrit.server.cache.PopulatingCache$1.createEntry(PopulatingCache.java:55)
>
>
> It is already more than an hour since the first thread dump and the CPU usage is still 100%
> and the top -H shows the same thread at the top.
>
> Looks like an infinite loop somewhere in MyersDiff?
>
> Sasa Zivkov
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