Disk performance / profiling

From: Gyula Szokoly <szgyula_at_tarkus.pha.jhu.edu>
Date: Tue, 01 Jun 1999 18:29:32 -0400 (EDT)

Hi,

  I have two (hopefuly) trivial questions:

1. I would like to see what my RAID array is doing. I have tried the
   'monitor' utility, but it only seems to work for SCSI drives, not
   the RAID disks (reN). I have also tried 'iostat', but no luck either.
   Without arguments it only shows the first four drives, which are
   SCSI disks/floppy. It just ignores my request for 're0' (I can
   specify a normal SCSI disk, but not a RAID disk). I just want to
   see trivial statistics (transaction/sec, bytes/sec, etc.) like the
   output of 'iostat re0 1 100' would be -- if it worked.

2. Is there any way to profile deeper than shared libraries? The best
   I could get was the time spent in each of the shared libraries, but
   nothing finer (i.e. what function in the library). Is there any way to
   get to this information?

Thanks,
  Gyula

P.S.: O/S is 4.0E, newest compilers (C++), machine is a 1000A 5/500.
Received on Tue Jun 01 1999 - 22:31:48 NZST

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