On Wed, 6 Jun 2001, Jason Lim wrote: > I was wondering if there is a way to find out what/where the bottleneck of > a large mail server is.
Look at vmstat. vmstat can tell you about number of processeses waiting for run time, amount of memory swapped to disk, blocks per second sent (and received) from disks, number of interrupts and context switches per second, CPU usage, and more. The difficult part of using this is to have a baseline to compare it with. For example, this is from a lightly-loaded system: procs memory swap io system cpu r b w swpd free buff cache si so bi bo in cs us sy id 0 0 0 3528 1804 1508 13868 0 0 0 1 104 7 1 1 98 0 0 0 3528 1804 1508 13868 0 0 0 0 104 7 1 1 98 BSD systems have detailed systat, vmstat, and fstat utilities that are useful for tracking down bottlenecks. (It sure seems like Linux would have similar tools, but I don't know where.) Jeremy C. Reed ....................................................... ISP-FAQ.com -- find answers to your questions http://www.isp-faq.com/