Richard Lynch wrote:
>
> My observations show that the results of the benchmark is heavily
> dependent on the amount of L2 cache.
>
>
>
>   Processor             OS/Type  VM   L2 Cache      
> Results   Description
>  
> --------------------------------------------------------------------------------------------------
>
>   Intel Core2 Duo 2.0       32-bit VMware  4096 KB        
> 1:43s   Laptop
>   AMD Opteron 165 1.8       64-bit       1024 KB        
> 3:08s   Home Desktop
>   AMD Opteron 165 1.8       32-bit       1024 KB        
> 2:21s   Home Desktop
>   AMD X2 4400+           64-bit        512 KB        
> 6:55s   Work Desktop
>   AMD X2 4400+           32-bit        512 KB        
> 6:27s   Work Desktop
>   Intel Xeon(TM) Core2 2.80GHz 32-bit       2048 KB        
> 2:39s   Work Server X-Series
>   Intel Xeon(TM) 3.00GHz Blade 32-bit VMware  1024 KB        
> 3:48s   Work Server VM Bladecenter
>
> The ones running on AMD chips were all running RHEL5. The servers
> (Core2 and Blade) were running RHEL4. And, the laptop was running
> Kubuntu 7.10 under VMware on WinXP. It appears that running in a
> virtualized environment has little effect. Note that the X2 (which is
> faster) performed worse than the Opteron.  However, the Opteron has
> twice the L2 cache. The laptop has the most L2 cache and beat them all
> significantly. My thinking is that because of the large memory
> footprint this benchmark makes heavy use of L2 cache.
<>

No doubt that it's making heavy use of cache. but a large memory
footprint it's not. Not these days, I have lots of programs running on
my desktop that are using more.

Cache works best with good locality of data and instruction code.

>> You need to measure the _system_ performance, that is the hardware and
>> the software both, in configurations you use or that you might use.
>>
>> Meanwhile, here are some more numbers:
>> + for o in s 1 2 3
>> + cc sorttest.c -Os -lm -o sorttest
>> + ./sorttest 20
>>
>> real   1m17.105s
>> user   1m16.270s
>> sys   0m0.671s
>> + for o in s 1 2 3

cache size    : 2048 KB


--

Cheers
John

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