From: "M. Edward (Ed) Borasky" Date: 2007-11-10T14:16:12+09:00 Subject: Re: Ruby/Fastcgi going into uninterruptible after random periods of time nate wrote: > Agree there too, and already done, sorry if I didn't clarify in the > original email! Top shows a lot of I/O wait as does sar(as far as > CPU I/O wait) but it seems just to be an artifact of the defunct > processes as there is no other signs that I/O is being used. Now *that's* bizarre -- I/O wait without disk utilization. I wonder if you need to check your kernel memory split and high memory I/O configuration. You may not be getting all the page cache space you can have with an 8 GB box. > Agree there too and there is no signs of swapping, the systems have 8GB > of memory and seem to run in the 3-5GB range. The biggest app does have > a memory leak and the system auto restarts it once the memory usage for > the app exceeds 5GB. 5 GB occupied in an 8 GB machine? Do you mean you have 3 GB of *free* memory? *That* would be a big problem. What kernel versions did the old and new systems have?