On 7/18/06, Robert Fox <rfox2@xxxxxx> wrote:
Hello- We've been using Apache 2 here at Notre Dame libraries for several years now, and for the most part, the performance has been very reliable. However, there have been times during very peak usage periods when the Apache servers will freeze and essentially stop responding to further requests. We have several CGI applications running under the server that can be taxing, and sometimes Apache seems to get overwhelmed, and the maximum number of available server spawns are reached. When this happens, I've tried to restart Apache by first shutting it down and then starting the server again. However, what usually happens is that the first server process will start, and child processes do not spawn. This renders Apache useless again, and I'm usually forced to completely re-boot the server machine on which Apache is running in order to clear RAM and reset the network connections. Then, Apache comes up and everything is fine until the next incident. Here are some specs on our installation: Server version: Apache/2.0.54 OS Version: Red Hat EL 3.0 (kernel 2.4.21-4.ELsmp) Modules loaded: PHP 5, authentication modules, etc. The CGI applications are mainly Perl based. I've looked in the Apache logs (both main and error) and there is no indication that the server is failing around the time that Apache freezes up. It seems odd that I can't stop the Apache servers and restart them, which solves 90% of these sorts of issues with Apache. Except for administrative purposes, I rarely need to restart Apache, so this isn't a major issue. But, I would like to know where to look to try and determine what is happening when I'm unable to restart Apache. It's odd that the first process would start but the child processes won't. Any ideas? Thank you for your help,
Could be a library linked to php blocking on some resource someplace. Any other non-standard modules in use? You might try getting some backtraces of stuck parent and child processes: http://httpd.apache.org/dev/debugging.html#backtrace Joshua. --------------------------------------------------------------------- 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: users-unsubscribe@xxxxxxxxxxxxxxxx " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
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