On 04/14/2010 01:25 AM, Nitro wrote: >>>> 40 tps sounds low: are you pushing blob content over the wire somehow? >> >> I have seen the ZEO storage committing transactions at least an order of >> magnitude faster than that (e.g., when processing incoming newswire >> feeds). I would guess that there could have been some other latencies >> involved in your setup (e.g., that 0-100ms lag you mention below). > > See my attached test script. It outputs 45-55 transactions/s for 100 > byte sized payload. Maybe there's a very fundamental flaw in the way the > test is setup. Note that I am testing on a regular desktop machine > (Windows 7, WoW64, 4GB RAM, 1TB hard disk capable of transfer rates > >100MB/s).
I don't think the transfer rate is actually that interesting. For small but many transactions the seek time/spinning speed should have the limiting influence. I've run the attached script a couple of times on my notebook, here's the results: 0.11 909.090909091 0.15 666.666666667 0.2 500.0 0.07 1428.57142857 0.07 1428.57142857 0.14 714.285714286 The initial runs are a bit lower as they were interfered with by other applications writing to the disk. It's a notebook w/ Intel P9600, Seagate 7.2k SATA drive, 4GB RAM, Ubuntu 10.04, linux 2.6.32, ext4 Christian -- Christian Theune · c...@gocept.com gocept gmbh & co. kg · forsterstraße 29 · 06112 halle (saale) · germany http://gocept.com · tel +49 345 1229889 0 · fax +49 345 1229889 1 Zope and Plone consulting and development _______________________________________________ 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
