On Tue, 18 Apr 2000, Ragnar Beer wrote: :What about Squid in between (in http accelerator mode)? :--Ragnar i use squid in http acc. mode, works fine. i had to set "Expires:" headers on the objects i wanted to cache (theres been a suggestion on how to use "Last-Modified" headers on the list lately). when serving from cache, i got 400 requests/sec. at a concurrency level of 300 (tested with apache benchmark on a pII 400 / 256mb ram). this should do for most cases, i guess. peter. : :>"J. Atwood" wrote: :> > :> > Are you sure that serving images off of Apache has any effect on :> > performance? I did a lot of testing on that (below) and did see any major :> > difference whether Zope served up the image or Apache did (out of a Zope :> > document). There was a slight increase but not enough (I felt) to deal with :> > the extra hassles of not having the images in Zope. :> :>YES. I am sure that serving images off Apache has a big effect on :>performance. Not only does Apache serving blow the pants off zope :>serving it alows some of the workload to be offloaded to a system that :>scales better when hit w/ high concurrent requests. I would say a :>performance increase of 3x to 9x is worth the extra configuration work. :> :>Here are some numbers from my tests w/ ab: :> :>Test using ab requesting the same 25K image via three access methods: :> :>1 - Apache Direct: using one file check in httpd.conf to check for :>existence of file and serving it from FS if it exists. :> :>2 - Zope via FCGI: using mod_FastCGI from Apache to retrieve image from :>a Zope server on a separate server from Apache. :> :>3 - Zope Direct: using port 8080 accessing Zope directly and requesting :>the same image. :> :> :>Image Size: 25,646 bytes :> :>rps = Request per second :>min = Connection Times (ms) Total: line min column :>min = Connection Times (ms) Total: line avg column :>min = Connection Times (ms) Total: line max column :> :> :> rps min avg max :> :>-n 10 -c 1 :>============================================= :>Apache Direct 84.03 11 11 12 (3x over Zope Direct) :>Zope via FCGI 11.83 44 84 245 :>Zope Direct 22.32 28 44 139 :> :>And if these numbers aren't enough, the chasim just grows from there. :>FCGI does add some overhead but if you're caching to FS that overhead :>quickly becomes nominal when you figure the increased serving speed of :>going staight from file. :> :> :>-n 100 -c 10 (run 1) :>============================================= :>Apache Direct 137.36 15 67 188 (9x over Zope Direct) :>Zope via FCGI 14.26 215 667 1953 :>Zope Direct 15.55 289 615 805 :> :>-n 100 -c 10 (run 2) :>============================================= :>Apache Direct 142.65 15 65 320 :>Zope via FCGI 18.55 314 523 1558 :>Zope Direct 15.19 352 624 819 :> :>-n 100 -c 10 (run 3) :>============================================= :>Apache Direct 117.10 17 77 282 :>Zope via FCGI 16.45 495 582 914 :>Zope Direct 17.51 178 556 909 :> :> :> :>-n 100 -c 25 (run 1) :>============================================= :>Apache Direct 136.99 19 162 336 :>Zope via FCGI 11.89 1359 1937 3050 :>Zope Direct 15.40 238 1432 1759 :> :>-n 100 -c 25 (run 2) :>============================================= :>Apache Direct 139.47 18 153 318 :>Zope via FCGI 15.67 632 1423 2103 :>Zope Direct 15.64 270 1402 1731 :> :>-n 100 -c 25 (run 3) :>============================================= :>Apache Direct 124.69 19 173 414 :>Zope via FCGI 14.23 700 1550 2119 :>Zope Direct 15.53 379 1427 1755 :> :> :> :>RE: your test suite. :> :>What where you actually testing in the ab printouts? I'm confused how :>you could test image serving rates using ab against test.html. Wouldn't :>that just test the load times for the HTML and not the images? :> :> :>Don't get me wrong I'm not saying zope is not the greatest dynamic :>serving enviroment I've every used. It is. I'm just pointing out when :>it comes to serving a site that's expected to get some serious load, :>look to the tools at your disposal. Zope alone may not make the cut, :>but Zope/Apache is truely a great combination. The configuration pains :>are more than worth it. :> :>-- :>------------------------------- :>tonyr@ep.newtimes.com :>Director of Web Technology :>New Times, Inc. :>------------------------------- :> :>_______________________________________________ :>Zope maillist - Zope@zope.org :>http://lists.zope.org/mailman/listinfo/zope :>** No cross posts or HTML encoding! ** :>(Related lists - :> http://lists.zope.org/mailman/listinfo/zope-announce :> http://lists.zope.org/mailman/listinfo/zope-dev ) : : :_______________________________________________ :Zope maillist - Zope@zope.org :http://lists.zope.org/mailman/listinfo/zope :** No cross posts or HTML encoding! ** :(Related lists - : http://lists.zope.org/mailman/listinfo/zope-announce : http://lists.zope.org/mailman/listinfo/zope-dev ) : -- _________________________________________________ peter sabaini, mailto: sabaini@niil.at -------------------------------------------------