The "times" call is very cheap and could not possibly consume so much time.
Here is what man page says:
NAME
times - get process and child process times
SYNOPSIS
#include <sys/times.h>
clock_t times(struct tms *buffer);
DESCRIPTION
times() fills the structure pointed to by buffer with time-accounting
information. The structure defined in <sys/times.h> is as follows:
struct tms {
clock_t tms_utime; /* user time */
clock_t tms_stime; /* system time */"
clock_t tms_cutime; /* user time, children */
clock_t tms_cstime; /* system time, children */
};
This information comes from the calling process and each of its
terminated child processes for which it has executed a wait(),
wait3(), or waitpid(). The times are in units of 1/CLK_TCK seconds,
where CLK_TCK is processor dependent The value of CLK_TCK can be
queried using the sysconf() function (see sysconf(2)).
Your problem is with the preceding "read" call. Try to figure out where is
attempting to read from, is there a process handling the file/device and
to which process is all that kernel CPU time billed. Try with ps -el and
top. Also, try with "netstat -i" to see whether you're retransmitting on
the high speed interconnect.
Mladen Gogala
Oracle DBA
Phone:(203) 459-6855
Email:[EMAIL PROTECTED]
-----Original Message-----
Sent: Friday, July 11, 2003 12:05 PM
To: Multiple recipients of list ORACLE-L
Mladen, As mentioned earlier, I have lots of "times"
funtion calls, which (my guess) relate to (60-70%)"IPC
send completion sync" waits I got in statspack. Dont
mean to fill your inboxes, but, pasting few truss
lines:
26949: read(14, "01 O\0\006\0\0\0\0\011 i".., 2064)
= 335
26949: times(0xFFBED228)
= 225698576
26949: times(0xFFBED0D8)
= 225698576
26949: times(0xFFBED228)
= 225698576
26949: times(0xFFBED108)
= 225698576
26949: times(0xFFBED108)
= 225698576
26949: times(0xFFBED108)
= 225698577
26949: times(0xFFBED108)
= 225698577
26949: times(0xFFBECA08)
= 225698577
26949: times(0xFFBECA08)
= 225698577
26949: times(0xFFBECC88)
= 225698577
26949: times(0xFFBECC88)
= 225698577
26949: times(0xFFBED0D8)
= 225698577
Thanks,
Ravi.
--- "Gogala, Mladen" <[EMAIL PROTECTED]> wrote:
> Just for fun, have you tried using truss to find out
> which calls
> are being used? That might help you.
>
> Mladen Gogala
> Oracle DBA
> Phone:(203) 459-6855
> Email:[EMAIL PROTECTED]
>
>
> -----Original Message-----
> Sent: Thursday, July 10, 2003 8:14 PM
> To: Multiple recipients of list ORACLE-L
>
>
> Raj,
> Yes. Timed_statistics=true. But I see the 'times'
> even
> in single instance(non-rac)database but relatively
> called negligible number of times.
> -Ravi.
> --- "Jamadagni, Rajendra"
> <[EMAIL PROTECTED]> wrote:
> > You seem to have timed_statistics=TRUE right ?? in
> > RAC you will ALWAYS see
> > GCS pings ... basically as long as
> > cluster_database=true, even if only one
> > node is running, you will still see Oracle trying
> to
> > ping other instances.
> >
> > My guess is that's what is happening ... but I
> could
> > be very well wrong, I
> > have RAC experience, but never tried to truss the
> > top processes.
> >
> > Raj
> >
>
----------------------------------------------------------------------------
> > ----
> > Rajendra dot Jamadagni at nospamespn dot com
> > All Views expressed in this email are strictly
> > personal.
> > QOTD: Any clod can have facts, having an opinion
> is
> > an art !
> >
> >
> > -----Original Message-----
> > Sent: Thursday, July 10, 2003 12:30 PM
> > To: Multiple recipients of list ORACLE-L
> >
> >
> > Hello List,
> >
> > We are running Benchmark tests on Solaris 2-Node
> > RAC.
> > Consistently noticed the following :
> > - Very high Kernel usage (averaging 45%) on TOP
> > - Statspack has "IPC Send Completion sync" waits
> > (70%
> > Total ela time)
> > - On trussing top process, found Oracle to be
> > issuing
> > huge number of "times" system calls in addition to
> > read/writes(which I think are select/inserts).
> > Has anyone noticed this in your environment. I am
> > guessing these to be inter-instance pings, but
> could
> > not get any hits in Doc/Metalink to confirm this.
> > "times" call is clocking lot of CPU. Is this
> normal
> > ?
> > Any pointers would be helpful ? If this is out of
> > context, is there a separate list for RAC?
> >
> > Thanks,
> > Ravi.
> >
> >
> >
> > __________________________________
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