Diagnosing performance cliffs on JDK7.

[MacGregor, Duncan (GE Energy)]

On 21/08/2012 19:31, "Christian Thalinger"
<christian.thalinger at oracle.com> wrote:

>I see.  Honestly I never saw this before with JSR 292 code but I have an
>idea why this is happening.  It is a performance cliff but a different
>one than the one we were always talking about.  This might also hit us in
>the new implementation.  At least now until we revisited our inlining.
>
>Could you try to run this with the latest JDK 8 b52:
>
>http://jdk8.java.net/download.html
>
>That is the first JDK 8 build that contains our new JSR 292
>implementation.

Okay, with that I get a different set of COMPILE SKIPPED cases. The
non-retryable cases are hard to pin down to any specific benchmark or
method in our source as they are reported against
java.lang.invoke.LambdaForm$MH. Overall performance is about half the
speed, I don't see any catastrophic individual performance cliffs in that,
but haven't done a full comparison yet.

65 matches for "COMPILE SKIPPED" in buffer: jdk8-b52.log
    575:    [junit]  387   COMPILE SKIPPED: concurrent class loading
   1667:    [junit] 1412   COMPILE SKIPPED: unlinked call site (FIXME
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   2140:    [junit] 1746   COMPILE SKIPPED: unlinked call site (FIXME
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   2405:    [junit] 1972   COMPILE SKIPPED: unlinked call site (FIXME
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   2563:    [junit] 2057   COMPILE SKIPPED: unlinked call site (FIXME
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   3231:    [junit] 2438   COMPILE SKIPPED: unlinked call site (FIXME
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   3393:    [junit] 2535   COMPILE SKIPPED: unlinked call site (FIXME
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   3701:    [junit] 2707   COMPILE SKIPPED: unlinked call site (FIXME
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   6845:    [junit]   35   COMPILE SKIPPED: unlinked call site (FIXME
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   7532:    [junit] 5146   COMPILE SKIPPED: illegal oopMap register name
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   7624:    [junit] 5203   COMPILE SKIPPED: illegal oopMap register name
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   7627:    [junit] 5204   COMPILE SKIPPED: illegal oopMap register name
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   7981:    [junit]   42   COMPILE SKIPPED: unlinked call site (FIXME
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   8051:    [junit] 5551   COMPILE SKIPPED: illegal oopMap register name
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   8056:    [junit] 5556   COMPILE SKIPPED: unsupported incoming calling
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   8057:    [junit] 5553   COMPILE SKIPPED: illegal oopMap register name
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   8164:    [junit] 5650   COMPILE SKIPPED: unsupported calling sequence
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   8396:    [junit] 5754   COMPILE SKIPPED: unsupported incoming calling
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   8552:    [junit]   43   COMPILE SKIPPED: unlinked call site (FIXME
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   9290:    [junit] 6281   COMPILE SKIPPED: unlinked call site (FIXME
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   9468:    [junit] 6415   COMPILE SKIPPED: invalid non-klass dependency
   9754:    [junit] 6606   COMPILE SKIPPED: unlinked call site (FIXME
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   9774:    [junit] 6618   COMPILE SKIPPED: Exception handler can be
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   9784:    [junit] 6622   COMPILE SKIPPED: unlinked call site (FIXME
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  10239:    [junit] 6933   COMPILE SKIPPED: Exception handler can be
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  10600:    [junit] 7164   COMPILE SKIPPED: unlinked call site (FIXME
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  15151:    [junit] 11533   COMPILE SKIPPED: unsupported calling sequence
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  15152:    [junit] 11535   COMPILE SKIPPED: unsupported calling sequence
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  15154:    [junit] 11538   COMPILE SKIPPED: unsupported incoming calling
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  15507:    [junit] 11678   COMPILE SKIPPED: unsupported calling sequence
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