Dear Tom,
The evidence is from the Process Activity Recorder, an Irix utility
similar to strace the reports syscall usage. A number of semop's are performed
in the operation of backend. Luis can send you specifics. --Bob
Luis Alberto Amigo Navarro writes:
>
>
> ----- Original Message -----
> From: "Tom Lane" <tgl@sss.pgh.pa.us>
> To: "Luis Alberto Amigo Navarro" <lamigo@atc.unican.es>
> Cc: <pgsql-hackers@postgresql.org>; "Robert E. Bruccoleri"
> <bruc@stone.congenomics.com>
> Sent: Monday, March 18, 2002 5:36 PM
> Subject: Re: Fw: [HACKERS] bad performance on irix
>
>
> > "Luis Alberto Amigo Navarro" <lamigo@atc.unican.es> forwards:
> > >> It's using the spinlocks
> > >> for some locks, but semaphores for others.
> >
> > That doesn't make any sense to me. For one thing, if HAS_TEST_AND_SET
> > is defined in the config header, the executable will just plain fail to
> > build if there's no tas implementation, because lmgr/spin.c won't be
> > compiled. And I sure don't see how some of the locks might be
> > implemented one way and some the other.
> >
> > Which ones do you think are being implemented as semaphores, and what's
> > your evidence?
> >
> > regards, tom lane
> >
> > ---------------------------(end of broadcast)---------------------------
> > TIP 5: Have you checked our extensive FAQ?
> >
> > http://www.postgresql.org/users-lounge/docs/faq.html
> >
>
>
+-----------------------------+------------------------------------+
| Robert E. Bruccoleri, Ph.D. | email: bruc@acm.org |
| P.O. Box 314 | URL: http://www.congen.com/~bruc |
| Pennington, NJ 08534 | |
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