max number of CPU PEs per GPU?

From: Danny Xu (quantum_mania_at_yahoo.com)
Date: Fri Jun 10 2011 - 01:17:53 CDT

Hi,

I was testing the namd 2.8b2 cuda binary (Linux-x86_64-CUDA) on a 48-core
opteron/1x GTX480 server. I got:
...
Pe 41 sharing CUDA device 0 first 0 next 42
Pe 40 sharing CUDA device 0 first 0 next 41
FATAL ERROR: CUDA error cudaStreamCreate on Pe 23 (chili device 0): no
CUDA-capable device is available
------------- Processor 23 Exiting: Called CmiAbort ------------
Reason: FATAL ERROR: CUDA error cudaStreamCreate on Pe 23 (chili device 0): no
CUDA-capable device is available

First I thought there was something wrong with the GTX480 card. Then I tried 12
PE's and the job ran just fine. It turned out the max number core I could use
with one GTX480 is 14. My question is, is this hard coded in namd 2.8? Or it's a
bug in 2.8b2 and has been fixed in 2.8?

It'd be nice if all 48-core could be used with the GPU.

Thanks,

DX

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