Re: Finding the Bottleneck
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
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