> I would imagine that just compiling ghostscript for i686 isn't enough;
> one would also have to recompile things it depends on (like libc) in
> order to really tell whether there was an improvement.
I do not think recompiling libc will make a noticible difference either;
any time ghostscript spends in libc is essentially wasted.
>
> In any case, if I go through the work to get the source RPMs to produce
> i586 and i686 code, does anyone know any particular reason why RedHat
> *wouldn't* accept that change into their source-base or whatever?
Space in the distro. If you want to add versions 486, 586, 686, 786 and
assorted AMD processors, disk space requirements will expand enormously.
Run procinfo on your system; here's the result on mine:
[summer@possum summer]$ procinfo
Linux 2.3.99-pre5 (root@possum) (gcc egcs-2.91.66) #34 1CPU
[possum.Summerfield]
Memory: Total Used Free Shared Buffers
Cached
Mem: 190428 185520 4908 0 35916
93272
Swap: 128480 43216 85264
Bootup: Thu Apr 20 15:07:15 2000 Load average: 0.02 0.06 0.02 1/111 910
user : 9:27:52.22 5.2% page in :127622816 disk 1: 2940464r
635536w
nice : 1d 1:16:28.74 13.8% page out: 1832242 disk 2: 1873407r
460w
system: 4:51:14.34 2.6% swap in : 336640 disk 3: 46899r
1892w
idle : 6d 0:00:32.92 78.4% swap out: 350623
uptime: 7d 15:36:08.21 context :110867739
irq 0: 66096822 timer irq 9: 72 acpi, aic7xxx
irq 1: 215199 keyboard irq 10: 1954128 epic100
irq 2: 0 cascade [4] irq 12: 3838482 PS/2 Mouse
irq 4: 1175 serial irq 13: 1 fpu
irq 6: 5 irq 14: 5430226 ide0
irq 7: 2 irq 15: 48740 ide1
irq 8: 1 rtc
[summer@possum summer]$
What would I benefit from a maby 5% improvement? Would I not be better
replacing my CPU with something faster?
Almost nobody will recover the time spent recompiling software using more
specific optimisations; only when the results are run on a lot of machines
does it become economically viable.
--
Cheers
John Summerfield
http://os2.ami.com.au/os2/ for OS/2 support.
Configuration, networking, combined IBM ftpsites index.
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