From: "Luck, Tony" <tony.luck@intel.com>
To: linux-ia64@vger.kernel.org
Subject: RE: weird speed problem
Date: Mon, 24 Nov 2003 16:52:53 +0000 [thread overview]
Message-ID: <marc-linux-ia64-106969378010242@msgid-missing> (raw)
In-Reply-To: <marc-linux-ia64-106957761119369@msgid-missing>
> First I've compiled it under shipped red hat... it ran 12 sec, I was
> happy because it took the same amount of time for 64bit amd opteron...
> Then I played with how fast ia32 emulation is (took it about
> 2-3 minutes
> for the same but ia32 bit compiled program). But then at some point
> after I recompiled it back to ia64 it started running almost
> as slow as ia32
One _potential_ reason why it ran fast one time, and slow on other runs
is the lack of page colouring in Linux. If the working set of your test
program is some large percentage of the cache size, then you can hit this
on any architecture, not just ia64.
-Tony Luck
next prev parent reply other threads:[~2003-11-24 16:52 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-11-23 8:52 weird speed problem Yaroslav Halchenko
2003-11-24 16:52 ` Luck, Tony [this message]
2003-11-24 20:00 ` Luck, Tony
2003-11-24 21:21 ` David Mosberger
2003-11-24 21:44 ` Yaroslav Halchenko
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=marc-linux-ia64-106969378010242@msgid-missing \
--to=tony.luck@intel.com \
--cc=linux-ia64@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox