PragDave: See Rails request paths in 'top'

During our sale, we had one particular request that came in and wedged the application: every time it hit, the mongrel process size zoomed steadily up to 500Mb, so we had to kill it. But finding out which request was doing this was tricky. The log files didn't help—with the amount of traffic we were getting, it was a small needle and a large haystack. Eventually, we found the culprit. But it would

[watamin_syou]

便利そう

[kgbu]

コマンド名である$0を書き換えちゃって、topコマンドで表示されるコマンド名を、requestヘッダに含まれるrequest pathの最初の16文字で置き換える。そうすると、負荷が高いプロセスとURIの関係が分かる。