speed of disk I/O on PPC
Garance A Drosihn
drosih at rpi.edu
Mon Jun 27 19:04:50 GMT 2005
At 9:24 AM +0200 6/27/05, Phil Regnauld wrote:
>Garance A Drosihn (drosih) writes:
>> me, so I haven't looked into other alternatives. I am running on
>> a Mac-mini though, which has a rather slow hard drive (4200 rpm).
>> So in my case, it's probably faster to stick with the NFS-mounted
>> directory... :-)
> Indeed on my G4-450 the disk is running in PIO mode, so NFS
> is definitely faster...
I just did some buildworld timings on my Mac-mini, which has that
really slow hard drive. I tried a buildworld with an NFS-mounted
/usr/obj directory, and another with an NFS-mounted /usr/src
directory. The NFS directories are coming from a i386 machine with
much faster disks. Oddly enough, the buildworld was faster with
both src and obj as local directories on the slow hard disk.
This was a very simplistic benchmark, and there were some other
things going on at the same time. Still, I was surprised that
NFS-mounting some directories did not seem to speed anything up.
Both local: real=5597.58 user=5157.62 sys= 75.53
NFS obj: real=6543.29 user=5203.52 sys=300.07
NFS src: real=6703.42 user=5564.93 sys= 90.69
Garance Alistair Drosehn = gad at gilead.netel.rpi.edu
Senior Systems Programmer or gad at freebsd.org
Rensselaer Polytechnic Institute or drosih at rpi.edu
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