On Tue, Feb 05, 2008 at 02:41:56PM +0100, Jeremy Cook wrote: > I have been struggling to understand why my zope3 site has a high > latency (ie initial response time is slow). Bandwidth seems to be > adequate, it just seems that it can take several seconds from clicking > on a link, to actually seeing that my server is awake and responding. > The server has no load or anything on it. I even started ZEO but see > little improvement.
Usually the first request is slower than the rest because the ZODB object caches are empty and it has to load everything from disk (or ZEO). > The strange thing is that when I click a link in 2 browsers on 2 > different hosts at the same time (right hand on desktop, lefthand on > laptop) I seem to get a faster response from both. I have tried both > with and without apache forwarding requests and dont seem to see any > difference. The problems seems to be something to do with zope3 taking > time to initially respond. > > Any ideas where to look or how to optimise anyone? Have you tried profiling that first request? You could, e.g. easy_install profilehooks (http://mg.pov.lt/profilehooks) and wrap the publish function with the @profile decorator, then hit ^C after Zope 3 serves the first request. Marius Gedminas -- (Pdb) operationerr.w_value.w_value.w_value.w_value.w_value.w_value <pypy.interpreter.executioncontext.OperationError instance at 0x5eee30> -- one of the clearer PyPy debugging sessions (seen in Michael Hudson's sig)
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