hi, as i understand, on linux, python uses the operating systems threads (so python is not simulating threads by himself).
that means that on a multi-CPU computer, the different threads may get executed on different CPUs. i am working with zope, and i was referenced to this page: http://www.zope.org/Members/glpb/solaris/report_ps it's rather old (2002), but it claims the following: > I do *not* recommend running Zope on multiprocessor machines without an > ability to restrict Zope to execution on a single CPU. > > The reason for this is that the Python Global Interpreter Lock is shared > inside a Zope process. However, threads in Python are backed by > underlying OS threads. Thus, Zope will create multiple threads, and > each thread is likely to be assigned to a different CPU by the OS > scheduler. However, all CPUs but one which are dispatching any given > Zope process will have to then wait and attempt to acquire the GIL; this > process introduces significant latency into Python and thus into Zope. now, i know about tools that allow me to bind a python process to a specific cpu, but i wonder.. is the performance soo bad when i am running a python process, and the threads are running on different cpus? i understand that because of the GIL i cannot make my application faster. but slower? thanks, gabor -- http://mail.python.org/mailman/listinfo/python-list
