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发表于 2005-11-24 14:27:37
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November 22, 2005 - 21:30 UTC
We began sending out the mass e-mail yesterday warning SETI@home classic users that we are going to close down the old project on December 15th. It was sent to all 200,000 of the active classic users by this morning. Inactive classic users are being e-mailed at this point.
Due to the influx of new BOINC users (and the unfortunate timing of some googlebots and other web spiders) the load on our web server was extremely high for the past 12 hours. To fix this, we finally deployed a second web server to split the load. As DNS updates spread throughout the internet, the load on klaatu (the original single web server) decreases while the load on penguin (the new secondary web server) increases. Both are Sun D220R's (2 x 440MHz Sparc, 2 GB RAM).
Part of the problem was that the web servers were configured to spawn more many clients than actually necessary, which left lingering, unused threads open on the database, which in turn lead to the database running out of connections. Some users saw messages to this effect when the load on the web servers was at its highest.
This looked like a database problem, when in fact we are currently enjoying a 10% performance boost on the database. Last week we moved some memory off the myisam tables (which contain web forum info and not much else) and slated it for the innodb tables (which contain user, host, result, workunit, etc. tables). The myisam tables didn't need the excess memory.
By the way, the master database merge (see below) is currently on for the beginning of next week. |
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