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Home -> Community -> Mailing Lists -> Oracle-L -> RE: RAC system Calls
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:mgogala_at_oxhp.com
-----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)
Thanks,
Ravi.
--- "Gogala, Mladen" <MGogala_at_oxhp.com> 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:mgogala_at_oxhp.com
>
>
> -----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"
> <Rajendra.Jamadagni_at_espn.com> 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
> >
>
*********************************************************************This> > product or exempt from disclosure under applicable
> > e-mail message is confidential, intended only for
> > the named recipient(s) above and may contain
> > information that is privileged, attorney work
you.*********************************************************************1
-- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Ravi Kulkarni INET: nandagokul_at_yahoo.com Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Gogala, Mladen INET: MGogala_at_oxhp.com Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).Received on Fri Jul 11 2003 - 11:59:23 CDT
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