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// SPDX-License-Identifier: BSD-3-Clause
/*
* streams_events_probe.cu - instrumented victory_streams_events.
*
* Same 3-stream event chain (c0 = a0+b0; c1 = (a1+b1)+c0; c2 = (a2+b2)+c1)
* but with per-buffer diagnostics: device pointers, per-buffer bad counts,
* and the first 8 expected/actual values of every output so a stale-input
* vs stale-readback failure is distinguishable in one run.
*
* Output lines:
* DEVICE ...
* DPTRS da0..dc2 (device), ha0..hc2 (host)
* BUF s=<n> bad=<n>
* FIRST s=<n> exp=<v0..v7> got=<v0..v7>
* STREAMS3 n=<count> bad=<mismatches>
* STATUS OK|FAIL
*/
#include <cstdio>
#include <cstdlib>
#include <cstdint>
#include <cuda_runtime.h>
#define CHECK(x) \
do { \
cudaError_t e_ = (x); \
if (e_ != cudaSuccess) { \
printf("CUDA_ERROR %s at line %d\n", \
cudaGetErrorString(e_), __LINE__); \
printf("STATUS FAIL\n"); \
return 1; \
} \
} while (0)
#define NSTREAMS 3
__global__ void vadd(const float *a, const float *b, float *c, int n)
{
int i = blockIdx.x * blockDim.x + threadIdx.x;
if (i < n)
c[i] = a[i] + b[i];
}
__global__ void vadd_into(float *c, const float *s, int n)
{
int i = blockIdx.x * blockDim.x + threadIdx.x;
if (i < n)
c[i] = c[i] + s[i];
}
int main(void)
{
cudaDeviceProp prop;
const int n = 1 << 16;
size_t bytes = (size_t)n * sizeof(float);
float *h_a[NSTREAMS], *h_b[NSTREAMS], *h_c[NSTREAMS];
float *d_a[NSTREAMS], *d_b[NSTREAMS], *d_c[NSTREAMS];
cudaStream_t st[NSTREAMS];
cudaEvent_t ev[NSTREAMS], t0, t1;
float ms = 0.0f;
int bad = 0, i, s;
const int grid = (n + 255) / 256;
setvbuf(stdout, NULL, _IONBF, 0);
CHECK(cudaGetDeviceProperties(&prop, 0));
printf("DEVICE %s cc=%d.%d sm=%d mem=%llu\n", prop.name,
prop.major, prop.minor, prop.multiProcessorCount,
(unsigned long long)prop.totalGlobalMem);
for (s = 0; s < NSTREAMS; s++) {
h_a[s] = (float *)malloc(bytes);
h_b[s] = (float *)malloc(bytes);
h_c[s] = (float *)malloc(bytes);
if (!h_a[s] || !h_b[s] || !h_c[s])
return 1;
for (i = 0; i < n; i++) {
h_a[s][i] = (float)((i + s) % 1000) * 0.5f;
h_b[s][i] = (float)((i + 2 * s) % 997) * 0.25f;
}
CHECK(cudaMalloc(&d_a[s], bytes));
CHECK(cudaMalloc(&d_b[s], bytes));
CHECK(cudaMalloc(&d_c[s], bytes));
CHECK(cudaStreamCreate(&st[s]));
CHECK(cudaEventCreate(&ev[s]));
}
CHECK(cudaEventCreate(&t0));
CHECK(cudaEventCreate(&t1));
printf("DPTRS");
for (s = 0; s < NSTREAMS; s++)
printf(" da%d=%p db%d=%p dc%d=%p", s, (void *)d_a[s], s,
(void *)d_b[s], s, (void *)d_c[s]);
printf("\n");
printf("HPTRS");
for (s = 0; s < NSTREAMS; s++)
printf(" ha%d=%p hb%d=%p hc%d=%p", s, (void *)h_a[s], s,
(void *)h_b[s], s, (void *)h_c[s]);
printf("\n");
CHECK(cudaEventRecord(t0));
for (s = 0; s < NSTREAMS; s++) {
CHECK(cudaMemcpyAsync(d_a[s], h_a[s], bytes,
cudaMemcpyHostToDevice, st[s]));
CHECK(cudaMemcpyAsync(d_b[s], h_b[s], bytes,
cudaMemcpyHostToDevice, st[s]));
vadd<<<grid, 256, 0, st[s]>>>(d_a[s], d_b[s], d_c[s], n);
CHECK(cudaGetLastError());
CHECK(cudaEventRecord(ev[s], st[s]));
}
CHECK(cudaStreamWaitEvent(st[1], ev[0], 0));
vadd_into<<<grid, 256, 0, st[1]>>>(d_c[1], d_c[0], n);
CHECK(cudaGetLastError());
CHECK(cudaEventRecord(ev[1], st[1]));
CHECK(cudaStreamWaitEvent(st[2], ev[1], 0));
vadd_into<<<grid, 256, 0, st[2]>>>(d_c[2], d_c[1], n);
CHECK(cudaGetLastError());
for (s = 0; s < NSTREAMS; s++)
CHECK(cudaMemcpyAsync(h_c[s], d_c[s], bytes,
cudaMemcpyDeviceToHost, st[s]));
CHECK(cudaEventRecord(t1, st[2]));
for (s = 0; s < NSTREAMS; s++)
CHECK(cudaStreamSynchronize(st[s]));
CHECK(cudaEventElapsedTime(&ms, t0, t1));
for (s = 0; s < NSTREAMS; s++) {
int b = 0;
float exp0[8], got0[8];
for (i = 0; i < n; i++) {
float c0 = h_a[0][i] + h_b[0][i];
float c1 = h_a[1][i] + h_b[1][i] + c0;
float c2 = h_a[2][i] + h_b[2][i] + c1;
float want = (s == 0) ? c0 : (s == 1) ? c1 : c2;
if (i < 8) {
exp0[i] = want;
got0[i] = h_c[s][i];
}
if (h_c[s][i] != want)
b++;
}
bad += b;
printf("BUF s=%d bad=%d\n", s, b);
printf("FIRST s=%d exp=", s);
for (i = 0; i < 8; i++)
printf("%.4f ", exp0[i]);
printf(" got=");
for (i = 0; i < 8; i++)
printf("%.4f ", got0[i]);
printf("\n");
}
printf("STREAMS3 n=%d bad=%d\n", n, bad);
printf("TIMING ms=%.3f\n", ms);
if (bad != 0) {
printf("STATUS FAIL\n");
return 1;
}
printf("STATUS OK\n");
return 0;
}
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