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USVyas
 

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    1. CODid you previously use the command line profiler(nvprof) in daemon mode ? Could you make sure that task manager does not show any processes named `nvprof` running in the background ? Could you also try the following : From a command line, run `nvprof --profile-all-processes`, then hit `ctrl+c` to terminate nvprof. At that point, retry running the app with cuda-memcheck.
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      1. POInternal Memcheck Error: Memcheck failed initialization as profiler is attached
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    2. CO1. Could you check that the attach functionality in the Nsight Monitor is disabled? You can do this by right clicking on the Nsight Monitor tray icon, hit Properties and go the CUDA section and disable "Use this Monitor for CUDA attach". 2. Could you also check if the environment variables CUDA_INJECTION32_PATH and CUDA_INJECTION64_PATH exist and if so, delete them and retry ?
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      1. POInternal Memcheck Error: Memcheck failed initialization as profiler is attached
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    3. COThe issue is that the application has a inter-warp (actually inter-block) global memory race. The problem actually stems from the line :`data1[idxS] = ComplexAdd(data0[idxS],data0[idxS+bfsize/2]);` At this point, `idxS` is scoped to the thread correctly, but `idxS+bfSize/2` can (and frequently will) alias to the idxS of a completely different block/thread. As a result there is a race between the read from `data0[idxS+bfSize/2]` and the write to data0[idxS] for a different thread at `data0[idxS] = data1[idxS];`.
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      1. POgetting the wrong output with CUDA when using more than one block
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