On Wed, Jul 29, 2009 at 2:17 AM, Steve Loughran <[email protected]> wrote:
> Scott Carey wrote: > >> Well, the first thing to do in any performance bottleneck investigation is >> to look at the machine hardware resource usage. >> >> During your test, what is the CPU use and disk usage? What about network >> utilization? >> Top, vmstat, iostat, and some network usage monitoring would be useful. >> It >> could be many things causing your lack of scalability, but without >> actually >> monitoring your machines to see if there is an obvious bottleneck its just >> random guessing and hunches. >> > > iotop is very good here > But sadly not available with kernels before 2.6.20 :( I was looking into this recently and the next best thing I could find was blktrace, but it's not nearly as nice. Any other tools people know about, especially that work on RHEL5/CentOS5? -Todd
