Am 06.05.2011, 17:12 Uhr, schrieb Paul Winkler <sli...@gmail.com>: > On Fri, May 06, 2011 at 12:19:39PM +0200, Pedro Ferreira wrote: >> A quick check with nethogs shows values of network usage oscillating >> between 100 and 200 KB/s. But I guess that if I were loading an >> excessive amount of data, this value would be higher, no? > > So throughput isn't the problem. > > I don't think you've mentioned what the latency is like between your > ZEO server and clients. What's the ping time look like? > > You mentioned pages that load lots of objects (200 objects each > referring to a "handful" of sub-objects). If they're not in the > client cache, each of those will require a separate fetch from the ZEO > server. > > As an example, let's say your average object size is only 1k, but due > to network latency it takes 5ms per fetch. Let's say your slow page > loads 1000 objects, and 100 of them are not in the cache. That's only > 100k of data, but you've spent 500ms waiting on the network.
It would be cool if you could give a hint to ZEO somehow to prefetch a certain set of objects along with their subobjects and then return everything in one batch. This way you avoid all the round-trips when you discover you want to retrieve a suboject. -Matthias _______________________________________________ For more information about ZODB, see the ZODB Wiki: http://www.zope.org/Wikis/ZODB/ ZODB-Dev mailing list - ZODB-Dev@zope.org https://mail.zope.org/mailman/listinfo/zodb-dev
