Hi, I've had a bizarre performance problem earlier this week and I can't figure it out. It'd be great if anyone had suggestions.
Twice recently, I've had extremely slow performance serving static files from a single virtual host on my Apache server. Files that were sent to Tomcat with mod_jk returned quickly, and files on other virtual hosts on the same machine returned quickly. But every 1 in 3 static files served by httpd in the affected virtual host took several seconds to return, irrespective of size. (e.g. a 12 kb image could take 6 seconds to return). A couple of notes: * Server load was low and swap space was barely being used * The problem appeared out of nowhere (no config changes) happened for an hour and went away. A week later it appeared for about 4 hours, then again fixed without warning. * When I copied all the web files to a different virtual host on the same box,it was lightening fast. * I suspected DNS/reverse DNS issues. But I ran a tcpdump on port 53 and saw no signs of DNS queries * I had large log files. I renamed them and stopped/started httpd. Still slow. * I ran a web analyzer on the Apache logs. Traffic was exactly average. * When I accessed the server from a machine on the same subnet, access was fast! So network distance (or maybe IP address) plays a role. One of my colleagues suspected the problem was strange registry settings at our top level domain. We were using nameservers from two different vendors for reliability. (and when we tested them, there was a serial number mismatch between them). But I hardcoded the DNS on my client in /etc/hosts (or the equivalent) and still saw the problem. Any pointers on what I should look for to diagnose this problem / prevent it in the future? I'm really at a loss as to what to do. We're running Apache 2.0.52 on RHEL 4, on a dual core, dual Woodcrest processor machine with 4GB Ram (also runs MySQL and Tomcat). The machine is in a data farm in Texas somewhere. Thanks, WILL -- View this message in context: http://www.nabble.com/performance-problem-in-one-virtual-host-tf4359125.html#a12423274 Sent from the Apache HTTP Server - Users mailing list archive at Nabble.com. --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: [EMAIL PROTECTED] " from the digest: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
