JRockit 1.4.2_04 released

Question

An update release for the JRockit 1.4.2_04 JVM has been released and is now
available from the BEA download site (http://commerce.bea.com). This is a
maintenance update to the JRockit 1.4.2_04 JVM release that was previously
released in April '04.
Some highlights of this release vs. JRockit 8.1 SP2 (J2SE 1.4.1):
- Support for new OSes. In addition to previously supported OSes, the
following are additional supported platforms - Red Hat EL 3.0 (IA32 / IPF),
Windows Server 2003 (IA32), and SuSE Linux Server 9 (IA32 / IPF). Support
for Red Flag 4.1 (IA32 / IPF) will be added soon after it's availability.
- This release will be bundled with each of the following Linux
distributions - Red Hat EL 3.0, SuSE Linux Server 9, Red Flag Advanced
Server 4.1.
- Improved runtime performance
- Improved startup performance
- Support for Native POSIX Thread Library (NPTL) on Linux
- Code caching (experimental feature)
- Numerous bug fixes
For more information on new features, please visit:
http://edocs.bea.com/wljrockit/docs142/intro/newftrs.html.
Finally, this JRockit release is bundled and certified with WebLogic
Platform 8.1 SP3, which is also available from the BEA download site.

Answer 1

Here is a test program you can use to test if for JVM leaks memory when creating
threads.
Johan Walles <johan@spamalamadingdong> wrote:
I don't think so, but I could be wrong.
Your best bet (in case nobody who actually knows answers this) is to
write a
short test program that starts tons of threads but always keeps the total
number
of threads at some sane value, then run that for a long time. Or ask
Vegard for
his :-).
//Johan
harish tejwani wrote:
We are running jrockit81sp2rp1_141_06 for our production
Any clue if it exists in this version ?
Thanks
Harish
"Vegard Bye" <[email protected]> wrote:
I've built a program, which just creates threads and let each of them
run. Each
thread just increases a couple of numbers and then terminates. After
about 13
million threads the program crashes with
Error Message: Null pointer exception in native code
Signal info : si_signo=11, si_code=1
Version : BEA WebLogic JRockit(TM) 1.4.2_04 JVM ari-29212-20040415-1332-linux-ia32
Threads / GC : Native Threads, GC strategy: parallel
: mmHeap->data = 0x20000000, mmHeap->top = 0x30000000
: mmStartCompaction = 0x23c00000, mmEndCompaction = 0x25000000
which may imply that it is correct that there is a memeory leak for
each
started
thread. In my test program the number of concurrent threads never increases
100.
This memory leak is very critical, since my server will crash afterabout
a day
or two.
Johan Walles <johan@spamalamadingdong> wrote:
There's a memory leak of about 100 bytes per started thread in JRockit
1.4.2_04.
If your app starts a lot of threads you may be running into this.
Regards //Johan
[TestCreateThreadMemoryLeak.java]