[icecast-dev] yp server resources spike

[Ralph Giles]

BTW, there seems to be an issue with the yp servers traffic handling. 
After motherfish came back up today (from 3 days of downtime) mysql
drove the load average up to 200, with the maximum number of mysqld 
instances all spinning in some kind of active wait. I attached to 
several but strace showed no activity during the period I was watching.

This is quite bad; we assumed something was wrong and took the site down 
to investigate, but I don't know much about mysql and didn't discover 
anything obvious. Was this just a spike from all the icecast servers 
trying to connect at once? If so the code needs tuning. This is a 
serious scalability limit.

It seems to be coming down slowly on its own now, which most of the 
mysqld processes going to sleep.

 -r
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