Date: Fri, 15 Nov 1996 12:57:49 +0800 (CST) From: Frank Chen-Hsiung Chan <frankch@waru.life.nthu.edu.tw> To: freebsd-current@freebsd.org Subject: fast libm? Message-ID: <Pine.BSI.3.95.961115124816.7632A-100000@waru.life.nthu.edu.tw>
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Our lab is planning to buy some PPro for scientific calculation.
We have previously test the performance of a PPro 200 running
FreeBSD and another running Linux.
The performance in the Linux box is 2 times faster than the
FreeBSD box. Through some investigation, we have found that the
problem is due to the math library. The Linux libm is optimized
for i386 machine, and written in assembly. Whereas FreeBSD libm
is written entirely in C.
Personally I favor the FreeBSD, but calculation speed is the
major concern.
I wonder whether there's anyone trying to optimize libm in
FreeBSD? I believe this will extend the use of FreeBSD in
scientific realms.
BTW, if the FPU option in /etc/make.conf is not turned on, the
FreeBSD performance will be 9 times slower than Linux (in Math
calculations).
--
Frank Chen Hsiung Chan |
------------------------------+---------------------------------
Department of Life Science | frankch@waru.life.nthu.edu.tw
National Tsing Hua University | http://waru.life.nthu.edu.tw/
Taiwan |
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