[Zope] Zope fine tuning HOW-TO / Zope Performance

[Peter Sabaini]

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.
:>-------------------------------
:>
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-- 

_________________________________________________
peter sabaini, mailto: sabaini@niil.at
-------------------------------------------------