[Beowulf] What class of PDEs/numerical schemes suitable for GPU clusters

Jan Heichler jan.heichler at gmx.net
Thu Nov 20 08:39:26 PST 2008


Hallo Mark,

Donnerstag, 20. November 2008, meintest Du:

>> [shameless plug]

>> A project I have spent some time with is showing 117x on a 3-GPU machine over 
>> a single core of a host machine (3.0 GHz Opteron 2222).  The code is 
>> mpihmmer, and the GPU version of it.  See http://www.mpihmmer.org for more 
>> details.  Ping me offline if you need more info.

>> [/shameless plug]

MH> I'm happy for you, but to me, you're stacking the deck by comparing to a
MH> quite old CPU.  you could break out the prices directly, but comparing 3x
MH> GPU (modern?  sounds like pci-express at least) to a current entry-level
MH> cluster node (8 core2/shanghai cores at 2.4-3.4 GHz) be more appropriate.

Instead of benchmarking some CPU vs. some GPU wouldn't it be fairer to 

a) compare systems of similar costs (1k, 2k, 3k EUR/USD)
b) compare systems with a similar power footprint

?

What does it help that 3 GPUs are 1000x faster than a Asus Eee PC? 

Jan
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