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Squid, is a caching web proxy, and is one of the great many back-end applications that we in the Systems department of Last.FM use to make your experience of the site that little bit smoother. We have Squid deployed as a reverse caching proxy.
This worked fine for a while, but over the past few days (as some of you have probably noticed and mentioned on the forums), it began to slow down. I set to work a couple of days ago debugging the speed decrease that had suddenly afflicted our squid cluster. Unfortunately, Squid is probably one of the least documented applications out there – the documentation that exists is vague, and doesn’t go into much detail; it would also seem that everyone else who’s set up squid either hasn’t dealt with the amount of traffic we do, or just hasn’t posted online about how they dealt with these issues when they cropped up. In debugging squid, there is approximately a 24 hour period after a modification before you really see whether what you have changed has fixed the problem. This is compounded if you add file-system benchmarking into the mix – the cache must refill bef...... (查看原文) 2007-09-01 18:51 |
