January 2009 - hotspot-gc-dev

hg: jdk7/hotspot-gc/hotspot: 6792421: assert(_bitMap->isMarked(addr+size-1), inconsistent Printezis mark)
by jon.masamitsu＠sun.com 31 Jan '09

31 Jan '09

Changeset: 9a25e0c45327 Author: jmasa Date: 2009-01-31 00:15 -0800 URL: http://hg.openjdk.java.net/jdk7/hotspot-gc/hotspot/rev/9a25e0c45327 6792421: assert(_bitMap->isMarked(addr+size-1),inconsistent Printezis mark) Summary: The CMS concurrent precleaning and concurrent marking phases should work around classes that are undergoing redefinition. Reviewed-by: ysr, tonyp ! src/share/vm/gc_interface/collectedHeap.hpp ! src/share/vm/interpreter/rewriter.cpp ! src/share/vm/memory/oopFactory.cpp ! src/share/vm/memory/oopFactory.hpp ! src/share/vm/oops/cpCacheKlass.cpp ! src/share/vm/oops/cpCacheKlass.hpp ! src/share/vm/oops/cpCacheOop.hpp

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hg: jdk7/hotspot-gc/hotspot: 6787254: Work queue capacity can be increased substantially on some platforms
by y.s.ramakrishna＠sun.com 30 Jan '09

30 Jan '09

Changeset: 23673011938d Author: ysr Date: 2009-01-30 14:17 -0800 URL: http://hg.openjdk.java.net/jdk7/hotspot-gc/hotspot/rev/23673011938d 6787254: Work queue capacity can be increased substantially on some platforms Summary: Increased the default and maximum size of the CMS marking stack and the size of the parallel workers' work queues in 64-bit mode. The latter was accomplished by an increase in the width of the Taskqueue's Age struct and its Tag field in 64-bit mode. Reviewed-by: jmasa, tonyp ! src/share/vm/runtime/globals.hpp ! src/share/vm/utilities/taskqueue.cpp ! src/share/vm/utilities/taskqueue.hpp

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hg: jdk7/hotspot-gc/hotspot: 7 new changesets
by y.s.ramakrishna＠sun.com 29 Jan '09

29 Jan '09

Changeset: 37b3ca071522 Author: coleenp Date: 2009-01-14 20:14 -0500 URL: http://hg.openjdk.java.net/jdk7/hotspot-gc/hotspot/rev/37b3ca071522 6793825: Missing include dependancies for GCC without predefined headers Summary: With predefined headers off for gcc, some .inline.hpp files aren't included to make definition visible for inline functions Reviewed-by: jcoomes, xlu ! src/share/vm/gc_implementation/includeDB_gc_concurrentMarkSweep ! src/share/vm/gc_implementation/includeDB_gc_g1 ! src/share/vm/gc_implementation/includeDB_gc_parNew ! src/share/vm/gc_implementation/includeDB_gc_parallelScavenge ! src/share/vm/includeDB_compiler2 ! src/share/vm/includeDB_core ! src/share/vm/includeDB_features Changeset: 8db2b3e46c38 Author: swamyv Date: 2009-01-14 19:45 -0800 URL: http://hg.openjdk.java.net/jdk7/hotspot-gc/hotspot/rev/8db2b3e46c38 6786948: SA on core file fails on solaris-amd64 if vm started with -XX:+StartAttachListener Reviewed-by: jjh, dcubed ! agent/src/os/linux/ps_core.c ! agent/src/os/solaris/proc/saproc.cpp Changeset: fc14734c5aec Author: swamyv Date: 2009-01-15 13:30 -0800 URL: http://hg.openjdk.java.net/jdk7/hotspot-gc/hotspot/rev/fc14734c5aec Merge Changeset: 40ee984935b9 Author: phh Date: 2009-01-21 11:14 -0500 URL: http://hg.openjdk.java.net/jdk7/hotspot-gc/hotspot/rev/40ee984935b9 6792705: Add JAR file to bootclasspath when using AggressiveOpts Summary: During argument processing, add alt-rt.jar to the bootclasspath between bootclasspath/p and default elements. Reviewed-by: xlu, coleenp ! src/share/vm/runtime/arguments.cpp Changeset: 99c597293e35 Author: coleenp Date: 2009-01-23 10:41 -0500 URL: http://hg.openjdk.java.net/jdk7/hotspot-gc/hotspot/rev/99c597293e35 Merge ! src/share/vm/gc_implementation/includeDB_gc_g1 Changeset: dc3ad84615cf Author: xlu Date: 2009-01-26 12:07 -0800 URL: http://hg.openjdk.java.net/jdk7/hotspot-gc/hotspot/rev/dc3ad84615cf 6795913: A few remaining wrong casts need to be fixed for building hotspot successfully on Mac OS. Summary: Use NULL_WORD in the places where intptr_t is expected due to incompatible types between intptr_t & int32_t Reviewed-by: phh, coleenp, never ! src/cpu/x86/vm/c1_Runtime1_x86.cpp ! src/cpu/x86/vm/interp_masm_x86_32.cpp ! src/cpu/x86/vm/interpreterRT_x86_32.cpp ! src/cpu/x86/vm/stubGenerator_x86_32.cpp ! src/cpu/x86/vm/templateInterpreter_x86_32.cpp ! src/cpu/x86/vm/templateTable_x86_32.cpp Changeset: 5b39c489c39d Author: ysr Date: 2009-01-29 21:25 -0800 URL: http://hg.openjdk.java.net/jdk7/hotspot-gc/hotspot/rev/5b39c489c39d Merge ! src/share/vm/gc_implementation/includeDB_gc_parNew

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hg: jdk7/hotspot-gc/langtools: Added tag jdk7-b45 for changeset 30db5e0aaf83
by john.coomes＠sun.com 29 Jan '09

29 Jan '09

Changeset: d957ceba29f9 Author: xdono Date: 2009-01-29 13:21 -0800 URL: http://hg.openjdk.java.net/jdk7/hotspot-gc/langtools/rev/d957ceba29f9 Added tag jdk7-b45 for changeset 30db5e0aaf83 ! .hgtags

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hg: jdk7/hotspot-gc/jdk: Added tag jdk7-b45 for changeset 527b426497a2
by john.coomes＠sun.com 29 Jan '09

29 Jan '09

Changeset: 997c6403bf2e Author: xdono Date: 2009-01-29 13:21 -0800 URL: http://hg.openjdk.java.net/jdk7/hotspot-gc/jdk/rev/997c6403bf2e Added tag jdk7-b45 for changeset 527b426497a2 ! .hgtags

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hg: jdk7/hotspot-gc/jaxws: Added tag jdk7-b45 for changeset dea7753d7139
by john.coomes＠sun.com 29 Jan '09

29 Jan '09

Changeset: af4a3eeb7812 Author: xdono Date: 2009-01-29 13:21 -0800 URL: http://hg.openjdk.java.net/jdk7/hotspot-gc/jaxws/rev/af4a3eeb7812 Added tag jdk7-b45 for changeset dea7753d7139 ! .hgtags

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hg: jdk7/hotspot-gc/jaxp: Added tag jdk7-b45 for changeset 0f113667880d
by john.coomes＠sun.com 29 Jan '09

29 Jan '09

Changeset: b2271877894a Author: xdono Date: 2009-01-29 13:21 -0800 URL: http://hg.openjdk.java.net/jdk7/hotspot-gc/jaxp/rev/b2271877894a Added tag jdk7-b45 for changeset 0f113667880d ! .hgtags

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hg: jdk7/hotspot-gc/corba: Added tag jdk7-b45 for changeset 68814aa5b44b
by john.coomes＠sun.com 29 Jan '09

29 Jan '09

Changeset: 1691dbfc08f8 Author: xdono Date: 2009-01-29 13:20 -0800 URL: http://hg.openjdk.java.net/jdk7/hotspot-gc/corba/rev/1691dbfc08f8 Added tag jdk7-b45 for changeset 68814aa5b44b ! .hgtags

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hg: jdk7/hotspot-gc: Added tag jdk7-b45 for changeset 99846f001ca2
by john.coomes＠sun.com 29 Jan '09

29 Jan '09

Changeset: e8a2a4d18777 Author: xdono Date: 2009-01-29 13:20 -0800 URL: http://hg.openjdk.java.net/jdk7/hotspot-gc/rev/e8a2a4d18777 Added tag jdk7-b45 for changeset 99846f001ca2 ! .hgtags

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Re: parallel adaptive gc
by Jon Masamitsu 29 Jan '09

29 Jan '09

Tony, The definition of GC cost used in the adaptive size policy work is the fraction GC-pause-time / time-interval where time-interval is the time from the start of of one GC to the start of the next GC. The time-interval is calculated as time-interval = GC-pause-time + time-between-GC where time-between-GC is time from the end of a GC to the start of the next GC. Each GC cost is calculated separately (minor GC cost and major GC cost). The intent is that the time-between-GC includes all the times (mutator times and times for other types of GC's). Does that make sense? I can't say why the GC cost is modeled as this fraction. Before the current adaptive size policy there was an implementation in 1.4.2 that did the sizing of the generations and the GC cost model may have come from that previous implementation. Jon Tony Guan wrote On 01/29/09 09:25,: >Hi, >I just reviewed some of the code of the class PSAdaptiveSizePolicy. >There is one thing I don't understand, why the mutator cost is >caculated 2 times: one is measured from the end of the minor >collection till the beginning of the next minor collection: >(_latest_minor_mutator_interval_seconds=_minor_timer.seconds), and the >other is measured from the end of a major collection till the >beginning of the next major collection.( >_latest_major_mutator_interval_seconds = _major_timer.seconds()) > >And the cost of minor collection is calculated as (this minor gc >time)/(this minor gc time+last MINOR mutator time) >the cost of major collection is : (this major gc time)/(this major gc >time+last MAJOR mutator time) > >But in fact, the two mutator time can be overlapping, since we don't >stop minor timer even when we are doing the major timer, and vice >versa. >So we end up with such possible counting: >time1 time2 >time3 >minor gc stops minor gc starts minor gc stops >minor_mutator_starts minor_mutator_ends minor_mutator_starts > >time4 time5 time6 >major gc starts major gc stops minor gc starts >major mutator ends major mutator starts minor mutator ends > >time 7 >minor gc ends >minor mutator starts. > >If we are at time 7, and want to caculate minor gc cost, then >last_minor_mutator is (time6-time3), and minor gc time is >(time7-time6) >but here (time6-time3)= >(time4-time3)+(time5-time4)+(time6-time5)=mutator time + full gc >time+mutator time. > >based on such cost calculation, I really doubt whether we could be >precise enough to do any prediction? > >Or that's maybe just my incomplete understanding of it, can somebody >help me out? > >Thanks! > > >Tony >_______________________________________________ >hotspot-gc-use mailing list >hotspot-gc-use(a)openjdk.java.net >http://mail.openjdk.java.net/mailman/listinfo/hotspot-gc-use > > _______________________________________________ hotspot-gc-use mailing list hotspot-gc-use(a)openjdk.java.net http://mail.openjdk.java.net/mailman/listinfo/hotspot-gc-use

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