It depends on the OS. I recently ran some 8000 threads in my program. On Windows XP, the limit is around 2000 threads and i dont quite know how to increase that.
On, Linux: 'ulimit -aH' yields this output on my fedora core2. It cud be different for different flavors. [01:55:18 wallace new]$ ulimit -aH core file size (blocks, -c) unlimited data seg size (kbytes, -d) unlimited file size (blocks, -f) unlimited max locked memory (kbytes, -l) unlimited max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 8 stack size (kbytes, -s) unlimited cpu time (seconds, -t) unlimited max user processes (-u) 3967 virtual memory (kbytes, -v) unlimited Here the stack size and the max user processes are of interest. The default stack size is set as unlimited hence python will allocate its own default stack size, which is arnd 8Mb(for each thread). On my machine this means the max no. of threads=400. To increase this u can issue the command(valid only for that terminal)- 'ulimit -s <stacksize in KB>'. I limited the size to 64KB in my case. Hence I could run 3967 threads which is the max user processes, Only root can increase this parameter by issuing 'ulimit -u <no. of processes>'. This is not relevant in your case as 100 threads can easily be handled i suppose, but i wrote this for the benefit of other users. As for the clumsy programming question- It depends on your program.While using so many threads, you are relying on your system's thread scheduler, which might not be very efficient. Cheers, Shitiz --- Jarek Zgoda <[EMAIL PROTECTED]> wrote: > Przemysław Różycki napisał(a): > > > - Is there any 'upper boundary' that limits the > number of threads? (is > > it python / OS related) > > - Is that the sign of 'clumsy programming' - i.e. > Is creating so many > > threads a bad habit? (I must say that it > simplified the solution of my > > problem very much). > > I've read somewhere (I cann't recall where, though, > was it MSDN?) that > Windows is not well suited to run more than 32 > threads per process. Most > of the code I saw doesn't spawn more threads than a > half of this. > > -- > Jarek Zgoda > http://jpa.berlios.de/ | http://www.zgodowie.org/ > -- > http://mail.python.org/mailman/listinfo/python-list > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com -- http://mail.python.org/mailman/listinfo/python-list
