Pedro Espinoza wrote:
Thank you, Tony.
I just compiled with -m32, yes, it made a difference: from 8m40s to
2m51s, on that box. Is there any way to effect globally such that all
calls made to qsort() make use of 32bit stuff.
This benchmark is all very interesting in an academic sense, but I;m
sceptical that it represents anyone's workload.
Nor does it do anything to exploit 64-bit capabilities. If you have lots
of RAM then you stand to gain considerably from the 64-bit architecture;
the CPUs handle it much better.
I don't know whether it's related, but I've misguidedly been trying to
repair my 64-bit Fedora 9A system with a 32-bit F8 rescue disk. It took
around 30 minutes to get it running ready to use, whereas once I got the
equivalent 64-bit media it was all over in a minute or two. The system
has 2 Gbytes of RAM.
This "benchmark" tests very little, and the measurements might be useful
as part of a model to estimate a system's performance, but it's of
little use in deciding how to run a complex workload.
For that you need a benchmark that is typical of what you really do,
that actually runs Perl scripts. If you load up databases then your
benchmark must include that activity, either with the same version (for
commercial such as Oracle) or with the version matching your OS (for
free such as Postgresql).
You need to measure the _system_ performance, that is the hardware and
the software both, in configurations you use or that you might use.
Meanwhile, here are some more numbers:
+ for o in s 1 2 3
+ cc sorttest.c -Os -lm -o sorttest
+ ./sorttest 20
real 1m17.105s
user 1m16.270s
sys 0m0.671s
+ for o in s 1 2 3
+ cc sorttest.c -O1 -lm -o sorttest
+ ./sorttest 20
real 1m16.831s
user 1m16.027s
sys 0m0.605s
+ for o in s 1 2 3
+ cc sorttest.c -O2 -lm -o sorttest
+ ./sorttest 20
real 1m16.941s
user 1m16.241s
sys 0m0.628s
+ for o in s 1 2 3
+ cc sorttest.c -O3 -lm -o sorttest
+ ./sorttest 20
real 1m16.821s
user 1m16.072s
sys 0m0.623s
++ echo -ne '\033]0;[EMAIL PROTECTED]:~'
I can't test 32-bit on this system, I don't have the libraries installed.
+ cc sorttest.c -Os -lm -o sorttest
+ ./sorttest 40
real 2m32.955s
user 2m31.507s
sys 0m1.181s
--
Cheers
John
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