From d913aa21b33212443c3be360ad99c5d2d0484f1d Mon Sep 17 00:00:00 2001
From: Neil Gershenfeld <gersh@cba.mit.edu>
Date: Sun, 24 Oct 2021 16:28:15 -0400
Subject: [PATCH] wip
---
CUDA/cudapi.cu | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/CUDA/cudapi.cu b/CUDA/cudapi.cu
index b755b84..9870945 100644
--- a/CUDA/cudapi.cu
+++ b/CUDA/cudapi.cu
@@ -35,7 +35,7 @@ void reduce(double *arr) {
uint64_t len = npts >> 1;
while (1) {
reduce_sum<<<blocks,threads>>>(arr,len);
- cudaCheck("reduce");
+ cudaCheck("reduce_sum");
len = len >> 1;
if (len == 0)
return;
@@ -50,10 +50,12 @@ int main(void) {
cudaCheck("init");
reduce(darr);
cudaDeviceSynchronize();
+ cudaCheck("cudaDeviceSynchronize");
auto tend = std::chrono::high_resolution_clock::now();
auto dt = std::chrono::duration_cast<std::chrono::microseconds>(tend-tstart).count();
auto mflops = npts*nloop*5.0/dt;
cudaMemcpy(harr,darr,8,cudaMemcpyDeviceToHost);
+ cudaCheck("cudaMemcpy");
printf("npts = %ld, nloop = %ld, pi = %lf\n",npts,nloop,harr[0]);
printf("time = %f, estimated MFlops = %f\n",1e-6*dt,mflops);
cudaFree(darr);
--
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