by Anonymous Cowa » Wed, 11 Jul 2001 23:33:04
by Michel TALO » Thu, 12 Jul 2001 00:25:56
: I'd like to increase performance by re-building my FreeBSD kernel with
: the Pentium option.
You have to indicate the correct type of the CPU in the Kernel config file.
This should make some very slight performance improvments.
: Will this also rebuild the c-compiler to generate
: Pentium code? Will I have problems with FreeBSD pre-built packages?
This will not rebuild the c-compiler and other userland. But you can do it.
At the end of the day you will gain nothing, because the optimisations in gcc
are not very efficient.
: --
: tia
--
Michel TALON
by Rasput » Thu, 12 Jul 2001 00:38:58
>: I'd like to increase performance by re-building my FreeBSD kernel with
>: the Pentium option.
> You have to indicate the correct type of the CPU in the Kernel config file.
> This should make some very slight performance improvments.
>: Will this also rebuild the c-compiler to generate
>: Pentium code? Will I have problems with FreeBSD pre-built packages?
> This will not rebuild the c-compiler and other userland. But you can do it.
> At the end of the day you will gain nothing, because the optimisations in gcc
> are not very efficient.
(be warned this has been known to bite. YMMV.)
--
Boren's Laws:
(1) When in charge, ponder.
(2) When in trouble, delegate.
(3) When in doubt, mumble.
Rasputin :: Jack of All Trades - Master of Nuns ::
by pe.. » Thu, 12 Jul 2001 04:01:57
It's the applications that should consume your cpu. If you find
your system working with much "system time" you might have a badly
written application that needs recoding.
--Quote:> --
> tia
1. AIX PS/2 C-compiler bug (or is it me?)?
Hi -
I have AIX PS/2 (the latest and greatest: updates of C compiler and
base operating system as of 2/12/90), but I am unable to compile the
following simple program:
main()
{
double d;
long l;
short s;
int i;
char *c;
c = (char *) l;
c = (char *) s;
c = (char *) i;
c = (char *) d;
...I get the following compile-time diagnostic:
14. c = (char *) s;
15. c = (char *) d; <<<<<
****** Error number 137 in line 14 of file test.c *****
****** Illegal type conversion *****
1 errors. 0 warnings. 16 lines. File test.c
...BTW, this program compiles fine on AIX 2.2.1 on the RT (6150/125).
This code is an isolation of code in a much larger program. The exact
same error occurs there, too (on the PS/2; RT is okay and the program
WORKS).
Any ideas? Thanks.......
Pete Gregory | uucp: uunet!bally!pete ________
Bally Systems, Inc. | phone: 702-323-6156 x882 / /|| \ \
255 Bell St. | FAX: 702-323-5997 | |\/ || _ |
Reno, NV 89503 | | | || | |
\ ||__/ /
\________/ '71 MGB
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