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| davetoo | I 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 |
| davetoo | The zserver-threads are left at the default 4. | 19:00 |
| davetoo | There is a problem with threading in the twisted library being used, | 19:01 |
| davetoo | wherein 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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| davetoo | The 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 |
| davetoo | the 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 |
| davetoo | How can I evaluate one vs. the other? | 19:04 |
| _mup_ | Branch | 19:08 |
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| mcdonc | davetoo: no substitute for experimenting and measuring | 19:27 |
| davetoo | yeah, that's what I was thinking; will have to do something like write a twill script to pound on the UI | 19:27 |
| mcdonc | that said, each zope thread manages its own in-memory cache, and usually these caches consume the lion's share of ram | 19:27 |
| mcdonc | so there's not much theoretical savings using threads vs. processes there | 19:28 |
| davetoo | interesting | 19:28 |
| mcdonc | performance might be slightly better with N processes vs. N threads if there's any per-thread or global lock contention | 19:30 |
| davetoo | If 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 recommendation | 19:30 |
| mcdonc | sort of doesnt matter in single threaded mode | 19:31 |
| mcdonc | http://docs.python.org/library/sys.html#sys.setcheckinterval | 19:31 |
| davetoo | *nod* | 19:31 |
| davetoo | I just don't know how expensive the check is; The doc implies that I still need it for signal handling :) | 19:32 |
| mcdonc | i wouldnt worry about it | 19:33 |
| 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 |
| _mup_ | Branch | 19:53 |
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| J1m | If you're compute bound, multiple processes is far better. | 19:58 |
| J1m | It's very hard to get Python to use more than one cpu. | 19:59 |
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| davetoo | I was reading as much | 19:59 |
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