From: Yaroslav Halchenko <yoh@onerussian.com>
To: linux-ia64@vger.kernel.org
Subject: Re: weird speed problem
Date: Sun, 23 Nov 2003 08:52:36 +0000 [thread overview]
Message-ID: <marc-linux-ia64-106957761119369@msgid-missing> (raw)
Hi. I'm currently running unstable debian with 2.4.20 smp prepackaged
kernel but the problem started appearing before on RH. So I thought may
be you can give me a good guess why this might happen
I have a really weird problem with estimating how fast my itanium is.
I have a really simple/stupid program which is the loop which iterates
1000 times around the point of iterative approximation of PI.
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 though file says
a.out: ELF 64-bit LSB executable, IA-64 (Intel 64 bit architecture)
version 1 (SYSV), for GNU/Linux 2.4.0, dynamically linked (uses shared
libs), not stripped
I reinstalled linux with debian... The same story - that damn program
which runs fast under all other architerctures runs stupidly slow 64bit
on itanium...
What could I screw by checking ia32 emulation so 'thoroughly'??
What can I check? I've checked /proc/acpi/cpu but didn't find anything
usefull/weird there...
P.S. bogomips run from command line reports just ~400 when /proc/cpuinfo
is 1400...
WHAT is WRONG??? Please advise
.-.
=------------------------------ /v\ ----------------------------Keep in touch // \\ (yoh@|www.)onerussian.com
Yaroslav Halchenko /( )\ ICQ#: 60653192
Linux User ^^-^^ [175555]
Key http://www.onerussian.com/gpg-yoh.asc
GPG fingerprint 3BB6 E124 0643 A615 6F00 6854 8D11 4563 75C0 24C8
next reply other threads:[~2003-11-23 8:52 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-11-23 8:52 Yaroslav Halchenko [this message]
2003-11-24 16:52 ` weird speed problem Luck, Tony
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-ia64-106957761119369@msgid-missing \
--to=yoh@onerussian.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