Sorry. Only just caught up with this:
Tony McDonald wrote:
(replies to list as some of this might be interesting to them)
Agreed. I imagine quite alot of people missed this next bit because of the subject line.
Loads of Zope work, upgrading servers to 2.5.1/python 2.1.3, and therein lies a tale. You might have seen the interchanges on the list between fearless Paul Browning, magic Matt Hamilton
Overdoing the Newcastle Brown again?
and I about threading on Solaris
http://www.zope.org/Members/glpb/news2
Upshot there is that Python is not very happy on multiprocessors
For those of you that didn't catch it: -------------------- On Tue, 28 May 2002, Matthew T. Kromer wrote: 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. Linux has no native mechanism for processor binding. In fact, there is a CPU dispatch mask for processes, but there is no facility to set the mask that I know of. Solaris can use a system command like 'pbind' to bind a process to a particular CPU. Full post at <http://zope.nipltd.com/public/lists/zope-archive.nsf/ByKey/381AE53C5F57B42 6> --------------------
hence I'm using the 'pbind' (solaris) command to allocate a processor to a particular Zope process. This has seriously made me look at Apple Xserve boxes (you know I have a penchant for the kind of stuff they make :) and the anguish from Bristol (PB's lair - a big solaris shop) has been heard all the way to the northeast!
Positive aspect of 2.5.1/2.1.3 is that our systems are much more stable, but I have a weird problem re:sessions that even has ChrisMcD baffled! (puffs out chest).
Tone: So how do you use pbind? Can you share a script or two? Thanks, Paul -- The Library, Tyndall Avenue, Univ. of Bristol, Bristol, BS8 1TJ, UK E-mail: paul.browning@bristol.ac.uk URL: http://www.bris.ac.uk/