On Mon, Jan 5, 2009 at 11:08 AM, <casper....@sun.com> wrote: > > >Hi, > > > >Is there a way to find processes that makes the most iowait in system? > >iostat -xtc and iostat commands shows me that the system in iowait > >state but I need to find out which processes cause that.. > > > > > iowait on OpenSolaris? AFAIK, "I/O wait" was removed from Solaris 10 > before it was released; it's therefor also not in OpenSolaris. > > Casper > > Hello Casper,
Please educate me: I missed the "io-wait" values for a long time. Then I thought I started to understand the reason why the metric was deemed invalid: While one process is blocked, any other process which is not blocked can use the CPU. Thus the CPU is just idle, not "waiting on IO". Conversely, I understand that while there is no specific "IO-wait" status for the system (or a CPU), a specific Process can still be waiting for IO? My understanding is that the reason why the metric is deemed meaningless is because it was reported against system resources (Eg a CPU) in stead of against a specific process. So the question is "how do you identify which processes are blocking on IO" (or page-in, or ...) Or better: How do you know how much each process is blocking? Thanx, _Johan -- Any sufficiently advanced technology is indistinguishable from magic. Arthur C. Clarke My blog: http://initialprogramload.blogspot.com
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