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News:2006-01-30_-_Recent_Outages

2006-01-30 - Recent Outages

Why archivers can kill a server
Why archivers can kill a server

Over the last week or so there have been some signifigant outages of the wiki and gentoo-portage.com . I'll try to explain them as best I can here

  • Jan 25th - 3 minor hiccups caused by me fiddling with some config values
  • Jan 28th - ~1 hour outage due to an out of control archiver on the wiki see: Image:Why Archivers Suck Terminal.png
  • Jan 29th - The big all day outage. This was the big one and the main reason I'm writing this news item, every so often pecl-apc will cause _something_ to happen that causes apache to fork uncontrollably until it reaches the hard limit set by /etc/limits. subsequently the machine locks up to all external access except ping. ("dont use pecl-apc then!" you say) Unfortunitly I NEED a php caching module such as APC and currently it is the only one that dosent cause this forking problem to happen almost instantly AND works with php5. and before everyone emails me about this see: Jan 30th Afternoon
  • Jan 30th Morning - Another APC hiccup caused because of me attempting to use apc_store / apc_fetch the night before cause the fork bomb to happen much faster then the usual ~2 weeks (I wont be trying that again soon)
  • Jan 30th Afternoon - I spent most of my afternoon trying other optimizers and other options for speeding up PHP without the fork bombing. No optimizer: almost instant lock due to excessive traffic. Zend Optimizer: Similar effect but took 3 min to happen. Eaccelerator: still does not run properly with my setup.

I have decided to give it a rest for a bit and wont try anything more until the squid proxy is setup; with the traffic this site gets it is difficult for me to try anything and see the results properly.

- Thrasher 22:35, 30 January 2006 (GMT)

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Last modified: Mon, 30 Jan 2006 11:39:00 +0000 Hits: 5,713