Thanks for this suggestion! We finally got our production servers switched over to shm, and it seems to have completely solved the problem. There have been no errors since we made the change.
-Al
-----Original Message-----
From: David Rees [mailto:[EMAIL PROTECTED]]
Sent: Thursday, January 11, 2001 11:12 AM
To: [EMAIL PROTECTED]
Subject: RE: modssl problems under heavy load
> The lines from httpd.conf are:
>
> SSLSessionCache dbm:/usr/local/apache/logs/ssl_scache
> SSLSessionCacheTimeout 300
>
> Should we maybe be using shm instead? I can imagine that dbm would have
> trouble if there was a lot of concurrent access attempts.
I would definately try the shm session cache, I found it to improve
performance quite a bit over the dbm session cache.
I'm currently using the shmcb session cache (vs the shmht or shm cache)
which is supposed to be better under heavy load, but I haven't seen your
problem when using either. To enable this you need to compile with
the --enable-rule=SSL_EXPERIMENTAL when configuring mod_ssl and then specify
SSLSessionCache shmcb:/path/to/ssl_scache(size of cache).
> The server gets about 50,000 to 100,000+ page views per day, and there are
> around 25-50 active sessions/logins in our web application during the day.
Doesn't seem like too much load on Apache itself...
> Also, the errors you said were normal...is that because the user
> pressed the
> Stop button? I don't think that is the case in this situation, because
> there are a ton of them all in a row, which normally wouldn't
> happen if the
> users were pressing stop occasionally.
Usually they'll push stop, (or back, or whatever) and there the page would
have already started loading all the graphics/etc for the page, which is why
you see a bunch of them at once. Either way, we see this on our servers
with similar load and I don't know of any problems. But I am not seeing
those other errors you showed us. We have had a few busier days with
hundreds of user sessions and about a million hits (not page views) in a 24
hour period with no problems, but this is on a SGI machine. We do have some
machines using Redhat 6.2 and mod_ssl, but they only see very light load.
-Dave
______________________________________________________________________
Apache Interface to OpenSSL (mod_ssl) www.modssl.org
User Support Mailing List [EMAIL PROTECTED]
Automated List Manager [EMAIL PROTECTED]
