From: Tim Walberg <twalberg@mindspring.com>
To: "Miguel González Castaños" <mgc@tid.es>
Cc: linux-admin@vger.kernel.org
Subject: Re: CPU tests
Date: Fri, 31 Mar 2006 08:28:08 -0600 [thread overview]
Message-ID: <20060331142808.GH15740@mindspring.com> (raw)
In-Reply-To: <442D29B0.6020806@tid.es>
On 03/31/2006 15:08 +0200, Miguel González Castaños wrote:
>> Dear all,
>>
>> I am trying to launch CPU tests on a Pentium IV Prescott 3.0 Ghz with
>> 4Gb of RAM. I have tried some tests from distributed.net and everything
>> seems to be ok, although with the test attached in the email (sorry for
>> the size of the mail), I am experiencing some problems. As you can see
>> with the static flag the number generation is faster than without that
That part is not surprising once you understand the dynamic linking
mechanism - it adds a small amount of overhead to every function call
into the library, because each function call is essentially an indirect
call. That said, the amount of overhead you're seeing does seem a bit
higher than I would expect (and the sqrt() case is possibly because
the compiler converts the sqrt() call into a fsqrt instruction in both
cases because of the -O3 - there is no instruction set equivalent for
the rand(), random() and log() cases).
tw
--
twalberg@mindspring.com
-
To unsubscribe from this list: send the line "unsubscribe linux-admin" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
prev parent reply other threads:[~2006-03-31 14:28 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-31 13:08 CPU tests Miguel González Castaños
2006-03-31 14:28 ` Tim Walberg [this message]
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=20060331142808.GH15740@mindspring.com \
--to=twalberg@mindspring.com \
--cc=linux-admin@vger.kernel.org \
--cc=mgc@tid.es \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.