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From "Ivan Popov (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-3822) [drlvm][gcv5] cannot create more than 334 threads on Linux SLES10
Date Tue, 08 May 2007 10:19:15 GMT
[drlvm][gcv5] cannot create more than 334 threads on Linux SLES10
-----------------------------------------------------------------

                 Key: HARMONY-3822
                 URL: https://issues.apache.org/jira/browse/HARMONY-3822
             Project: Harmony
          Issue Type: Bug
          Components: DRLVM
         Environment: Linux/x86 SLES10, harmony-jdk-r535876
            Reporter: Ivan Popov


After switching Harmony to GCv5, I cannot run JPDA tests on Linux SLES10. After a number of
tests passed, remaining tests fail with OutOfMemoryException while creating thread. With -XX:vm.dlls=libgc_cc.so
all tests pass. 

I see this problem only on SLES10 (kernel 2.6.16.21-0.25-bigsmp). It is not reproduced on
SLES9 (kernel 2.6.5-7.191-bigsmp). 

I'm attaching simple test that creates and runs 3000 threads sequentially. It works well for
GCv41 and hangs for GCv5 with 100% cpu utilization after throwing exception (^C does not kill).

Here is test output for SLES10:
-----------------------------------------------------------------------------------------
$ uname -a
Linux nstdrlxl11 2.6.16.21-0.25-bigsmp #1 SMP Tue Sep 19 07:26:15 UTC 2006 i686 i686 i386
GNU/Linux

$ .../target/hdk/jdk/jre/bin/java -XX:vm.dlls=libgc_cc.so -cp . ThreadTest
<****>
Created threads: 10000

$ .../target/hdk/jdk/jre/bin/java -XX:vm.dlls=libgc_gen.so -cp . ThreadTest
<****>
Created threads: 334
^C
^Z
[1]+  Stopped                .../target/hdk/jdk/jre/bin/java -XX:vm.dlls=libgc_gen.so -cp
. ThreadTest
-----------------------------------------------------------------------------------------

This work well on SLES9:
-----------------------------------------------------------------------------------------
$ uname -a
Linux nstdrlel16 2.6.5-7.191-bigsmp #1 SMP Tue Jun 28 14:58:56 UTC 2005 i686 i686 i386 GNU/Linux

$ /export/users/ipopov1/svn_harmony_federated/trunk/target/hdk/jdk/jre/bin/java -XX:vm.dlls=libgc_cc.so
 -cp . ThreadTest
<*****>
Created threads: 10000

$ /export/users/ipopov1/svn_harmony_federated/trunk/target/hdk/jdk/jre/bin/java -XX:vm.dlls=libgc_gen.so
 -cp . ThreadTest
<*****>
Created threads: 10000
-----------------------------------------------------------------------------------------


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