Daniel Malmkvist wrote:
To my supprise i could not have more then ~3500 threads at the same time.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.
I got a OutOfMemoryException, but there was plenty of system memory left
(the JVM only ha about 10% of system physical memory).
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.
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