Mail Archives: pgcc/1998/05/12/21:35:16
Hi!
>Hello there. I am not a member of the list so I would appreciate it if
>replies were directed directly to me. I'll summarize to the list.
Well, first of all, you really should get member of this list. There is
not much traffic, you will expect about 3 mails a day. Some of these
mails will give you the answer to your question.
>Are there any special considerations when using pgcc with the AMD K6
>processors? When compiling, do we tell pgcc it is a Pentium, a Pentium
>Pro, a 486? Has anyone done any benchmarks with this compiler and K6's.
gcc -mamdk6 -O3 gives a nice improvement and seems to be stable, even
at times when the newest version is buggy. But, believe it or not, most
of the improvements are made because the Intel Pentium, and I mean
Intel, has a big problem with its pipelines. A lot of the improvements
are something like workarounds, to get both pipelines most of the time
busy. The AMD K6 does most of this scheduling in hardware! My K6 is
about 15% faster than my Pentium was. And as I expected, there is not
so much speedup, compared to Intel, when using the pgcc-Compiler.
>I have a lot of busy mail and web servers running Redhat 5.0 on K6-233mhz
>machines. If I could upgrade them to pgcc and get a "free" 5-30% speed
>improvement, I would be a really happy person. 8-)
As I said, you already had 15% by using AMD (compared to 233-MMX-Pentium),
so expect only the rest, giving a total of 30%.
Join the mailing list, read these low-traffic list, you will see when the
available version is stable, and don't expect too much unless you downgrade
to Intel :-)
Btw: If you are running a web-server, than you should have a test machine
to check out if everything works. pgcc is always beta, even when pretty
stable.
--
Wolfgang Formann (wolfi AT unknown DOT ruhr DOT de)
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