Kirk Strauser wrote:
I'm running a command (dumprecspg from my XBaseToPg project) on a FreeBSD 7
server. I've noticed that throughput on that program is a lot lower than I
would have expected, and further investigation found it spending most of its
time in the kernel, presumably in read() [1].
I was testing the same software on my desktop PC when I noticed that it ran
*much* faster, and found that it was spending only about 1% as much time in
the kernel on Linux as it was on FreeBSD.
I ran a quick-and-dirty comparison of the same software on two different
machines, the FreeBSD server being by far the more powerful of the two. I
ran the same command on both machines from various filesystems (to rule out
differences in drive performance), and posted the output of zsh's "time"
command for the fastest run in each setting. The results are below.
Any ideas what could be causing this horrible performance? I'm willing to
try just about anything.
ktrace(1) and check for the buffer size in use. It is probably too small.
Kris
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