Re: numbers don't lie ...
- From: Danny Braniss <danny@xxxxxxxxxxxxx>
- Date: Thu, 14 Sep 2006 15:20:18 +0300
On Wednesday 13 September 2006 08:36, Danny Braniss wrote:
Im testing these 2 boxes, Sun X4100 and Dell-2950, and:
SUN X4100: Dual Core AMD Opteron(tm) Processor 280 (2393.19-MHz K8-class
CPU) one 70g sata disk
DELL 2950: Intel(R) Xeon(TM) CPU 3.20GHz (3192.98-MHz K8-class CPU)
4 sata disks + raid0
they both run identical 6.1-STABLE.
my 'cpu benchmark' shows the amd being much better than the intel.
but, doing a make buildworld give interesting results:
dell-2950 : make -j16 TARGET_ARCH=amd64 buildworld : 24m17.41s real
1h3m3.26s user 17m15.07s sys
dell-2950 : make -j8 TARGET_ARCH=amd64 buildworld : 24m8.28s real
1h2m59.38s user 16m16.20s sys
sunfire : make -j16 TARGET_ARCH=amd64 buildworld : 24m21.38s real 49m6.68s
user 14m22.64s sys
sunfire : make -j8 TARGET_ARCH=amd64 buildworld : 23m47.69s real 48m53.58s
user 13m44.81s sys
which probably says something about my 'cpu benchmark' :-(
but why is the user time so much different between the boxes?
Maybe the sunfire's CPU is faster, but has to wait on the harddisk. The
buildworld 'benchmark' is probably for a large part I/O bound.
nah, i have run the makefile with serveral different disks, ie
raid0, raid5, FC, iSCSI, SAS,
and the numbers/times don't change (or not significantly).
and in any case, it's the dell that has the fastest disks, but the user time
is the largest.
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