[Zope] Urgent help needed: Zope falls over under moderate load

[Chris McDonough]

Are the pages uncacheable because they're restricted by security or
for another reason?

----- Original Message -----
From: "Michael Fraase" <mfraase@farces.com>
To: "'Chris McDonough'" <chrism@zope.com>; <zope@zope.org>
Sent: Tuesday, November 20, 2001 1:14 PM
Subject: RE: [Zope] Urgent help needed: Zope falls over under moderate
load


> Thanks Chris,
>
> I've cached what I can find. The only page that's cacheable is
> index_html; the pages being hit are another layer deeper in the
> hierarchy. I've also cached all of the page elements (images,
header,
> footer) I could find.
>
> --
> Michael Fraase
> ARTS & FARCES LLC
> mfraase@farces.com
> www.farces.com
> PGP Fingerprint:
> 3D85 F3F4 9E65 4949 176A  260C CB47 190D C864 9A96
>
> > -----Original Message-----
> > From: Chris McDonough [mailto:chrism@zope.com]
> > Sent: Tuesday, November 20, 2001 12:11 PM
> > To: mfraase@farces.com; zope@zope.org
> > Subject: Re: [Zope] Urgent help needed: Zope falls over under
> > moderate load
> >
> >
> > Your clients maybe *should* laugh at you if you're not doing
> > any caching.  ;-)
> >
> > To cache, you have two options.
> >
> > Use Zope's RAM Cache Manager to do caching.  As a result, the
> > pages you choose to cache will be cached in RAM and won't be
> > regenerated on each request.
> >
> > - OR -
> >
> > Use a caching web server in front of Zope to bear the brunt
> > of the load in conjunction with (perhaps) the HTTP
> > Accelerated Cache Manager stuff in Zope.  In this case, your
> > web server (or proxy) keeps a copy of a pregenerated page and
> > serves it out to requestors instead of continually asking
> > Zope to regenerate it.
> >
> > One of these is going to be necessary for any sort of
> > high-traffic site.  Zope can't keep up when it needs to
> > dynamically generate content; you need to help it out by
> > doing some kind of caching.
> >
> > If you don't or can't use Cache Managers, but you still want
> > to use an HTTP caching proxy in front of your Zope site,
> > you'll need to make each of the pages you want to cache has
> > an "Expires" and "Last Modified" header.  You may do this by
> > using RESPONSE.setHeader if you're not using a cache manager.
> >  If you're behind Apache, you can use mod_proxy with caching
> > turned on.
> >
> > See http://www.zope.org/SiteIndex/search?text_content=caching
> > for more information.
> >
> > I've also found the document about mod_perl and headers at
> > http://perl.apache.org/guide/correct_headers.html helpful...
> > there are lots of other nuggets in that document as well.
> >
> > HTH,
> >
> > - C
> >
> >
> >
> > ----- Original Message -----
> > From: "Michael Fraase" <mfraase@farces.com>
> > To: <zope@zope.org>
> > Sent: Tuesday, November 20, 2001 12:39 PM
> > Subject: [Zope] Urgent help needed: Zope falls over under
> > moderate load
> >
> >
> > > So yesterday my site got slashdotted. Zope fell over within
minutes.
> > A
> > > day later it's still falling over within an hour or so.
> > >
> > > I have 512Kb DSL (the outbound channel is 512Kb; the inbound
channel
> > is
> > > 768Kb). I figured that bandwidth would be saturated or that
Windows
> > 2000
> > > Pro would melt long before Zope would fail, but that has proven
not
> > to
> > > be the case.
> > >
> > > Here's the particulars of my installation:
> > >
> > > Pentium III 850MHz with 768Mb RAM
> > > MS Windows 2000 Pro with current patches and service packs
> > Zope 2.4.3
> > > running as a service Squishdot 1.3.0
> > > 512Kb bandwidth
> > >
> > > Here's the registry start parameters:
> > >
> > > "C:\PROGRA~1\FARCES~1\bin\python.exe"
> > "C:\PROGRA~1\FARCES~1\z2.py" -S
> > > -w80 -W9800
> > >
> > > I don't know what the -S is; -w80 sets the port Zope's web
server
> > > listens on; and -W9800 sets the WebDAV port.
> > >
> > > Zope just shuts down and closes port 80 on what seems to be very
> > > moderate load. We're talking a peak of less than 60,000 hits, a
peak
> > of
> > > 125Mb bandwidth usage, just over 58,000 page views, and a peak
of
> > 4013
> > > visitors.
> > >
> > > What I've been doing is to manually stop the Zope service and
> > restart
> > > it, but that's ridiculous. At this rate, clients are going to
laugh
> > at
> > > me when I suggest using Zope for a web project.
> > >
> > > Anyone have any ideas? I'm digestified, so please cc me in any
> > response.
> > >
> > > Thanks kindly.
> > >
> > > --
> > > Michael Fraase
> > > ARTS & FARCES LLC
> > > mfraase@farces.com
> > > www.farces.com
> > > PGP Fingerprint:
> > > 3D85 F3F4 9E65 4949 176A  260C CB47 190D C864 9A96
> > >
> > >
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>
>
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