multiple GPUs problem: same kernel,some devices have low speed?

Discussion created by wyxxlz on Sep 2, 2010
Latest reply on Sep 5, 2010 by himanshu.gautam

i use 5970,which have two devicesevice0 and device1;

i run the kernel in single devices model(device0 or device1), need 4093 ms to run the kernel ;

while i run the kernel in multiple devices model,the time need sometime need 4093 ms,some time need 12000ms?