Robert Lor [EMAIL PROTECTED] wrote:
CVS head now has the following LWLock probes, and more can easily be
added. These probes can be enabled using the sample DTrace scripts at
http://pgfoundry.org/projects/dtrace/
lwlock-acquire
lwlock-release
lwlock-startwait
lwlock-endwait
Tom Lane [EMAIL PROTECTED] wrote:
This seems fairly invasive, as well as confused about whether it's an
#ifdef'able thing or not. You can't have system views and pg_proc
entries conditional on a compile-time #ifdef, so in a default build
we would have a lot of nonfunctional cruft exposed to
Tom Lane wrote:
I'm confused ... is this patch being proposed for inclusion? I
understood your previous message to say that it didn't help much.
This is only the patch for carving where there is any problem.
The patch is buggy as posted, because it will try to do this:
if
ITAGAKI Takahiro [EMAIL PROTECTED] writes:
Tom Lane [EMAIL PROTECTED] wrote:
This seems fairly invasive, as well as confused about whether it's an
#ifdef'able thing or not. You can't have system views and pg_proc
entries conditional on a compile-time #ifdef, so in a default build
we would
Tom Lane wrote:
I think the actual wave of the future for analyzing behavior at the
LWLock level is going to be DTrace. It seems way more flexible than
an aggregate-statistics view can be.
CVS head now has the following LWLock probes, and more can easily be
added. These probes can be
Katsuhiko Okano [EMAIL PROTECTED] writes:
(A) The algorithm which replaces a buffer is bad.
A time stamp does not become new until swapout completes
the swapout page.
If access is during swap at other pages, the swapout page will be
in the state where it is not used most,
It is again
Hi,All.
Since the cause was found and the provisional patch was made
and solved about the CSStorm problem in previous mails, it reports.
Subject: [HACKERS] poor performance with Context Switch Storm at TPC-W.
Date: Tue, 11 Jul 2006 20:09:24 +0900
From: Katsuhiko Okano [EMAIL PROTECTED]
Katsuhiko Okano wrote:
Since the cause was found and the provisional patch was made
and solved about the CSStorm problem in previous mails, it reports.
(snip)
(A) The algorithm which replaces a buffer is bad.
A time stamp does not become new until swapout completes
the swapout page.
If
Hi hackers,
I tackled the performance problem on SUBTRANS module with Okano.
He and I reach a conclusion that SubTrans log is heavily read on a specific
access pattern in my TPC-W implementation. There seems to be awful traffic
on SUBTRANS to check visivility of tuples in
