IRC log of #zope for Friday, 2012-06-29

« Thursday, 2012-06-28 Index Saturday, 2012-06-30 »
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davetooI have a zope2-related question I'm kind of embarassed to have to ask:  we are running a zope-based app (zenoss) behind an Apache load-balancer/proxy (+ssl) with a handful of zopes running to handle the load.19:00
davetooThe zserver-threads are left at the default 4.19:00
davetooThere is a problem with threading in the twisted library being used,19:01
davetoowherein for the zope instances we use for integration with other systems, which get hit hard and fast, we've found that we need to run zope single-threaded.19:01
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davetooThe vendor claims that, essentially, running a pool with sixteen 1-thread zopes is equivalent to a pool with four 4-thread zopes.19:02
davetoo(these are 8-core hyperthreaded boxes, so the apps have what appear to be 16 cores available)19:02
davetoothe question is: I would think that, say, a 15-thread zope instance would use less system resources than a pool of 15 1-thread zope instances.19:04
davetoo(the back-end is RelStorage)19:04
davetooHow can I evaluate one vs. the other?19:04
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mcdoncdavetoo: no substitute for experimenting and measuring19:27
davetooyeah, that's what I was thinking; will have to do something like write a twill script to pound on the UI19:27
mcdoncthat said, each zope thread manages its own in-memory cache, and usually these caches consume the lion's share of ram19:27
mcdoncso there's not much theoretical savings using threads vs. processes there19:28
davetoointeresting19:28
mcdoncperformance might be slightly better with N processes vs. N threads if there's any per-thread or global lock contention19:30
davetooIf I run single-threaded, what should I do, if anything, to the check-interval setting?   At the moment, it's set to about 1500 based on a code fragment provided by the vendor that gives a recommendation19:30
mcdoncsort of doesnt matter in single threaded mode19:31
mcdonchttp://docs.python.org/library/sys.html#sys.setcheckinterval19:31
davetoo*nod*19:31
davetooI just don't know how expensive the check is; The doc implies that I still need it for signal handling :)19:32
mcdonci wouldnt worry about it19:33
mcdonc(iow, i dont know, you'll have to measure, but i dont think it's going to make any difference at all for a single thread)19:34
davetoo*nod*19:35
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J1mIf you're compute bound, multiple processes is far better.19:58
J1mIt's very hard to get Python to use more than one cpu.19:59
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davetooI was reading as much19:59
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