Hi I have successfuly folowed your advise. After rekompiling the kernel so that I now can address 4G of memory, change the max #processes plus changed the thread stacksize i now can create more than 12 000 threads (which is pretty cool i thing), the limit must now be the 4G addressspace limit. I guess the next step is to buy i 64 bit platform...
Many thanks /Daniel On Wed, 04 Feb 2004 09:56:57 -0800 Hui Huang <[EMAIL PROTECTED]> wrote: > Nathan Bryant wrote: > > Daniel Malmkvist wrote: > > > >> To my supprise i could not have more then ~3500 threads at the same time. > >> I got a OutOfMemoryException, but there was plenty of system memory left > >> (the JVM only ha about 10% of system physical memory). > >> > >> > > Address space might be a limiting factor in a 32-bit machine. Assuming a > > 3gig/1gig VM split, you have less than a megabyte per thread stack at > > 3500 threads, even assuming there is no other memory overhead, and there > > is a lot of other overhead... Did you try using the Thread constructor > > that specifies a stack size? Try specifying a single page - 4K. > > > > You might also need to increase the maximum size of the Java heap. (Or > > decrease it to make room for more stack?) I have found that it can't > > grow beyond 1.5gig on x86. > > > > If you are allocating the default stack size which is probably fairly > > large, > > Default stack size is 512k. You need 3500 * 512k = 1750M address space > for 3500 threads. Try -Xss96k. Also check your limit on max #processes > (ulimit -u), you can't create more threads than that limit either. > > regards, > -hui > > the system won't appear to be using the memory because the stack > > pages won't have corresponding physical pages allocated by the VM until > > they are used - the stacks grow down. But they are still allocated > > virtual address space within the process. > > > > > > ---------------------------------------------------------------------- > > To UNSUBSCRIBE, email to [EMAIL PROTECTED] > > with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED] > > > > > > ---------------------------------------------------------------------- > To UNSUBSCRIBE, email to [EMAIL PROTECTED] > with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED] > ---------------------------------------------------------------------- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
