[ILUG] anyone have any experience of java thread problems on linux ?

[Hunt, Bryan]

Hi Mathew, 

Here is my problem. 

Linux (red hat at least) has limits on the number of threads that can be
created by 
a process ... apparently this is 1024 threads. 
I have a test program called TestThreads. When I run this program it creates
threads 
, each thread sleeps 60 seconds and then finishes. I cannot get past a
thread count of
1024 . I will be needing a lot more threads than that for my application to
work properly.

On windows I can run the program from the console and it goes up to 7988
threads so it looks
to my boss like linux can't scale :( this is not the view of Linux that I
want to 
perpetuate. 

The problem IMHO is that the glib library has been compiled with the 
#define PTHREAD_THREADS_MAX     1024 
in the file 
./linuxthreads/sysdeps/unix/sysv/linux/bits/local_lim.h
I have modified this and uped the number to 8192. 
#define PTHREAD_THREADS_MAX     8192 

I have then configured it with
./configure --enable-add-ons --prefix=/usr

and did a make and make install ... (this took about 2 hours to run) 

I then tried out my thread testing program again. 
Same thing... it gets to 1018 threads and then produces an out of memory
error.

I can run 4 instances of it at the same time in four different consoles and
I get 
console 1 664 
console 2 1018
console 3 1017 
console 4 917

This is wierd ... anyone got any ideas ?

--B

PS: I've been in google hell for a couple of days so no links to volcano ...
been there 


-----Original Message-----
From: Matthew French [mailto:mfrench42 at yahoo.co.uk]
Sent: Friday, May 03, 2002 2:20 PM
To: Hunt, Bryan
Subject: Re: [ILUG] anyone have any experience of java thread problems
on linux ?


Bryan Hunt asked:
> Anyone have any experience of java thread problems on linux ?
> Specifically problems with compiling glibc from source on redhat 73
platform

Could you give more information? Which java? What is the error message?

Although I cannot say I have had to recompile java or glibc very recently...

- Matthew



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