Thanks, Kinkie. The version that I'm running contains a couple of minor modifications, so as a first pass I'd rather get the 2.6 version working, rather than go through a repatch. I tried running under valgrind, and it found a couple of leaks, but I'm not sure that those are strictly the problem. If it were a "traditional" memory leak, where memory was just wandering off, I don't quite see why the CPU would climb along with the memory usage. Mark. -----Original Message----- From: Kinkie [mailto:gkinkie@xxxxxxxxx] Sent: Wednesday, December 17, 2008 4:50 PM To: Mark Kent Cc: squid-users@xxxxxxxxxxxxxxx Subject: Re: Performance problems with 2.6.STABLE18 On Wed, Dec 17, 2008 at 4:24 PM, Mark Kent <mkent@xxxxxxxxxxxxxxx> wrote: > > Hi, > > I'm currently having a performance issue with Squid 2.6.STABLE18 > (running on RHEL4). As I run traffic through the proxy, the memory > grows steadily, and apparently without limit. This increase in memory > usage is coupled with a steadily growing CPU usage, up to a point at > which a single core is saturated (97% usage at ~400MB of RSS). At this > point, the latency of requests increases. When the load is taken off > the proxy, the CPU returns to minimal usage, but the memory usage > sticks at the high water mark. > I should point out that I'm using squid for authentication only (HTTP > digest), not for caching. Consequently, I have maximum_object_size and > maximum_object_size_in_memory both set to 0 in the squid config file. > My understanding is that this should be sufficient to stop squid from > caching. > > There's plenty of spare physical RAM on the machine, so it seems > unlikely that it's a memory shortage causing the performance problem. > My interpretation is that something has gotten too large for Squid to > handle but, without object caching, it's not clear to me what that > might be. I would blame the authentication cache, but there's only > 2000 different users. > > Does anyone have an idea what might be going on, and how to fix it? There may be a memory leak somewhere.. Squid 2.6 is rather old, can you try upgrading to the last 2.7 STABLE release? Kinkie ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
