unable to create new native thread when start WebLogic 8.1 on HP-UX 11.11

[Ladislav Dvorak]

Hello guys,

please I have one question, we migrate our application server from HP-UX 11.00 to HP-UX 11.11.

When I run this AS with (-Xms1424m -Xmx1424m) on HP-UX 11.00 there is no problem.

When I run with (-Xms1424m -Xmx1424m) on HP-UX 11.11 I get "java.lang.OutOfMemoryError: unable to create new native thread" message.

When I run with (-Xms3076m -Xmx3076m) on HP-UX 11.11, this is without problem again.

Please, can someone say me, why with the same setting of java heap, I have problem on different version of HP-UX.

I try check kernel parameters, installed patches and seems that all is correct (according HPjconfig).

Thank you for any info, which can explain this issue.

Ladislav Dvorak

[Steven E. Protter]

Shalom,

First thing that comes to mind is the versions of JAVA are probably different on the two systems as the 11.00 system is out of support and hasn't seen a Java update in a few years.

Check JAVA version first.

SEP

[Ladislav Dvorak]

Shalom Steven,

java is the same. Is JDK 1.4.2_09. The application server was completely copied including java. That's why I dont see.

Thank

[Dennis Handly]

How much swap space do you have? "swapinfo -tam"
How big is maxdsiz/maxdsiz_64bit?

[Ladislav Dvorak]

Hi Dennis,

HP-UX 11.00 server

swapinfo -tam

Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 4096 0 4096 0% 0 - 1 /dev/vg00/lvol2
reserve - 3263 -3263
memory 9945 949 8996 10%
total 14041 4212 9829 30% - 0 -

maxdsiz 0X11000000 = 272M
maxdsiz_64bit 0x0000000040000000 = 1024M


HP-UX 11.11 server

Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 16384 0 16384 0% 0 - 1 /dev/vg00/lvol2
reserve - 3989 -3989
memory 13289 52 13237 0%
total 29673 4041 25632 14% - 0 -

maxdsiz 0xc0000000 = 3072M
maxdsiz_64bit 0x100000000 = 4096M

[Dennis Handly]

>total 14041 4212 9829 30%
>maxdsiz 0X11000000 = 272M
>maxdsiz_64bit 0x0000000040000000 = 1024M

I can't see how it works for 11.00, since smaller. For 32 bit mode you only have 272 Mb. And 1 Gb for 64 bit mode. (I don't see -d64 in your java options.)

>total 29673 4041 25632 14%
>maxdsiz 0xc0000000 = 3072M
>maxdsiz_64bit 0x100000000 = 4096M

You seem to have much larger maxdsiz.
In both, your swapspace since fine at the time you ran swapinfo(1m).

I suppose you could have too many threads?
What is max_thread_proc & nkthread?

[Dennis Shin]

The results show the following command:

$kcusage -d nkthread
$kcusage -d max_thread_proc

[Dennis Handly]

>Dennis Shin: the following command: kcusage

This won't work too well on 11.11. :-)

[Dennis Shin]

Oops sorry..kcusage not work on 11.11


Try the following test
1. reduces the number of thread (ex:using weblogic thread pool..)

2. reduces Thread Stack Size (ex:-Xss256k)

3. reduces Java Heap..

4. using 64bit JVM (There are some performance degradation)

[Ladislav Dvorak]

Server with HP-UX 11.00

nkthread 3635
max_thread_proc 1024

Server with HP-UX 11.11

nkthread 6000
max_thread_proc 4096

All java parameters are here:-Xverbosegc:file=server2/logs/gc_log.out -server -Xms2560m -Xmx2560m -XX:NewSize=400m -XX:MaxNewSize=400m -XX:SurvivorRatio=6 -XX:MaxPermSize=256m -XX:PermSize=256m -da -Dplatform.home=/opt/wli8/wlp813 -Dwls.home=/opt/wli8/wlp813/server -Dwli.home=/opt/wli8/wlp813/integration -Dlog4j.configuration=file:/opt/wli8/wlp813/common/lib/workshopLogCfg.xml -Dweblogic.management.discover=false -Dweblogic.management.server=http://172.6.2.4:7003 -Dweblogic.security.SSL.ignoreHostnameVerify=true -Dwlw.iterativeDev=false -Dwlw.testConsole=false -Dwlw.logErrorsToConsole=false -Dweblogic.webservice.i18n.charset=utf-8 -Dweblogic.security.SSL.enforceConstraints=off