Re: numbers don't lie ...

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?



Even though your asking about user time I would like to point out I have long prefered to see build world as by far a hard disk io benchmark over a CPU benchmark.
After doing such benchmarks my self I have noticed my raid 1 SAS Dells with upto 40% less CPU power crush my Dell dual socket 3.6ghz raid 5 SAS servers in buildworld speed, this is purely because simple fact raid 5 is much slower on writes, CPU has far less to do with buildworld performance.
Also a Dell 2950 on SATA seems to be a bit of a odd combination as I would believe most people get the SAS drives for a Dell 2950 and use the PERC5 / mfi SAS device crontroller.

Mike

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Relevant Pages

  • Re: numbers dont lie ...
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