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OpenCL under Linux is slow unless I use CL_QUEUE_PROFILING_ENABLE

Question asked by vmiura on May 10, 2013
Latest reply on Jun 12, 2013 by himanshu.gautam



I'm getting severely slowed down performance under Linux (Ubuntu 12.04 64bit) with HD 7790 Catalyst Performance Driver.  It ran fine under Windows on the same GPU (about 4 to 8 times faster).


When I tried profiling with CodeXL - the slow down went away.  I then realized that setting CL_QUEUE_PROFILING_ENABLE made it run a lot faster, just like under Windows.