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...already did the Mutex patch to use unshitf and pop instead of shift and push and it didn''t really help much. The mem leak only really shows up when you use the wsess option to httperf. The other day I saw a ruby C extension that Mentalguy built called optimized_locking. It has an OptimizedMutex class that is written in C. Its actually pretty small amount of C code and fairly easy to understand. Anyway, long story short, I patch the latest mongrel trunk and added this optimized_locking.c in as another C extension that gets built when you make the gem. It has helped quite a bit wi...