Bug fix when using peer-to-peer communication

ce2cd27b · Peter Eastman · 5e6d705e · ce2cd27b
Commit ce2cd27b authored Apr 19, 2013 by Peter Eastman
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platforms/cuda/src/CudaParallelKernels.cpp platforms/cuda/src/CudaParallelKernels.cpp +2 -1

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--- a/platforms/cuda/src/CudaParallelKernels.cpp
+++ b/platforms/cuda/src/CudaParallelKernels.cpp
@@ -194,7 +194,8 @@ double CudaParallelCalcForcesAndEnergyKernel::finishComputation(ContextImpl& con
        // Sum the forces from all devices.
        CudaContext& cu = *data.contexts[0];
-        contextForces->upload(pinnedForceBuffer, false);
+        if (!cu.getPlatformData().peerAccessSupported)
+            contextForces->upload(pinnedForceBuffer, false);
        int bufferSize = 3*cu.getPaddedNumAtoms();
        int numBuffers = data.contexts.size()-1;
        void* args[] = {&cu.getForce().getDevicePointer(), &contextForces->getDevicePointer(), &bufferSize, &numBuffers};