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// SPDX-License-Identifier: BSD-3-Clause
/*
* p2_mixed - mail + vadd + int reduction + 2D grid + 2 streams in one
* process, freeing each phase before the next so the peak live device
* footprint stays at the vadd phase (3 x 32 KB = 24 pages).
*
* phase 1: device-authored mail via a parameter-buffer kernel
* phase 2: vectorAdd n=8192 (element-exact fp32)
* phase 3: 4096 -> 1 int reduction (shared memory + atomicAdd)
* phase 4: 2D grid hash kernel (40x20, block 16x16, partial tiles)
* phase 5: 2 streams, addv + scale per stream (exact fp32)
*/
#include "common.h"
#define MIX_MAIL "the little gpu man says p2 mixed"
#define VN 8192
#define RD_N 4096
#define G2_NX 40
#define G2_NY 20
#define ST_N 1024
#define ST_NS 2
__global__ void mail_kernel(char *out, const char *msg, int len)
{
int i = blockIdx.x * blockDim.x + threadIdx.x;
if (i < len)
out[i] = msg[i];
}
__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 reduce_sum(const int *in, int *out, int n)
{
__shared__ int sdata[256];
int tid = threadIdx.x;
int i = blockIdx.x * blockDim.x + tid;
sdata[tid] = (i < n) ? in[i] : 0;
__syncthreads();
for (int s = blockDim.x >> 1; s > 0; s >>= 1) {
if (tid < s)
sdata[tid] += sdata[tid + s];
__syncthreads();
}
if (tid == 0)
atomicAdd(out, sdata[0]);
}
__global__ void grid2d(int *out, int nx, int ny)
{
int ix = blockIdx.x * blockDim.x + threadIdx.x;
int iy = blockIdx.y * blockDim.y + threadIdx.y;
if (ix < nx && iy < ny) {
int idx = iy * nx + ix;
out[idx] = 1000000 + idx;
}
}
__global__ void addv(float *x, float v, int n)
{
int i = blockIdx.x * blockDim.x + threadIdx.x;
if (i < n)
x[i] = x[i] + v;
}
__global__ void scale(float *x, float s, int n)
{
int i = blockIdx.x * blockDim.x + threadIdx.x;
if (i < n)
x[i] = x[i] * s;
}
static int phase_mail(void)
{
char h[128];
char *d_out = NULL, *d_msg = NULL;
int len = (int)strlen(MIX_MAIL);
int bad = 0;
if (cudaMalloc(&d_out, len) != cudaSuccess)
return 1;
if (cudaMalloc(&d_msg, len) != cudaSuccess) {
cudaFree(d_out);
return 1;
}
cudaMemcpy(d_msg, MIX_MAIL, len, cudaMemcpyHostToDevice);
mail_kernel<<<1, 64>>>(d_out, d_msg, len);
cudaGetLastError();
cudaDeviceSynchronize();
cudaMemcpy(h, d_out, len, cudaMemcpyDeviceToHost);
bad = (memcmp(h, MIX_MAIL, len) != 0) ? 1 : 0;
if (bad == 0)
printf("MAIL %s\n", h);
cudaFree(d_out);
cudaFree(d_msg);
printf("RESULT mixed mail bad=%d\n", bad);
return bad;
}
static int phase_vadd(void)
{
float *h_a = (float *)malloc(sizeof(float) * VN);
float *h_b = (float *)malloc(sizeof(float) * VN);
float *h_c = (float *)malloc(sizeof(float) * VN);
float *d_a = NULL, *d_b = NULL, *d_c = NULL;
int bad = 0;
if (!h_a || !h_b || !h_c)
return 1;
for (int i = 0; i < VN; i++) {
h_a[i] = (float)(i % 1000) * 0.5f;
h_b[i] = (float)(i % 997) * 0.25f;
}
if (cudaMalloc(&d_a, sizeof(float) * VN) != cudaSuccess)
return 1;
if (cudaMalloc(&d_b, sizeof(float) * VN) != cudaSuccess)
return 1;
if (cudaMalloc(&d_c, sizeof(float) * VN) != cudaSuccess)
return 1;
cudaMemcpy(d_a, h_a, sizeof(float) * VN, cudaMemcpyHostToDevice);
cudaMemcpy(d_b, h_b, sizeof(float) * VN, cudaMemcpyHostToDevice);
vadd<<<(VN + 255) / 256, 256>>>(d_a, d_b, d_c, VN);
cudaGetLastError();
cudaDeviceSynchronize();
cudaMemcpy(h_c, d_c, sizeof(float) * VN, cudaMemcpyDeviceToHost);
for (int i = 0; i < VN; i++)
if (h_c[i] != h_a[i] + h_b[i])
bad++;
cudaFree(d_a);
cudaFree(d_b);
cudaFree(d_c);
free(h_a);
free(h_b);
free(h_c);
printf("RESULT mixed vadd n=%d bad=%d\n", VN, bad);
return bad;
}
static int phase_reduce(void)
{
int *h_in = (int *)malloc(sizeof(int) * RD_N);
int *d_in = NULL, *d_out = NULL;
int got = 0, exp = 0, bad = 0;
if (!h_in)
return 1;
for (int i = 0; i < RD_N; i++) {
h_in[i] = i;
exp += i;
}
if (cudaMalloc(&d_in, sizeof(int) * RD_N) != cudaSuccess)
return 1;
if (cudaMalloc(&d_out, sizeof(int)) != cudaSuccess)
return 1;
cudaMemcpy(d_in, h_in, sizeof(int) * RD_N, cudaMemcpyHostToDevice);
cudaMemset(d_out, 0, sizeof(int));
reduce_sum<<<(RD_N + 255) / 256, 256>>>(d_in, d_out, RD_N);
cudaGetLastError();
cudaDeviceSynchronize();
cudaMemcpy(&got, d_out, sizeof(int), cudaMemcpyDeviceToHost);
bad = (got != exp) ? 1 : 0;
cudaFree(d_in);
cudaFree(d_out);
free(h_in);
printf("RESULT mixed red n=%d sum=%d bad=%d\n", RD_N, got, bad);
return bad;
}
static int phase_grid2d(void)
{
int n = G2_NX * G2_NY;
int *d_out = NULL, *got = (int *)malloc(sizeof(int) * n);
int bad = 0;
if (!got)
return 1;
if (cudaMalloc(&d_out, sizeof(int) * n) != cudaSuccess) {
free(got);
return 1;
}
grid2d<<<dim3(5, 2), dim3(16, 16)>>>(d_out, G2_NX, G2_NY);
cudaGetLastError();
cudaDeviceSynchronize();
cudaMemcpy(got, d_out, sizeof(int) * n, cudaMemcpyDeviceToHost);
for (int i = 0; i < n; i++)
if (got[i] != 1000000 + i)
bad++;
cudaFree(d_out);
free(got);
printf("RESULT mixed grid2d nx=%d ny=%d bad=%d\n", G2_NX, G2_NY,
bad);
return bad;
}
static int phase_streams(void)
{
float *h = (float *)malloc(sizeof(float) * ST_N);
float *got = (float *)malloc(sizeof(float) * ST_N);
cudaStream_t st[ST_NS];
float *d_x[ST_NS];
int bad = 0;
if (!h || !got)
return 1;
for (int i = 0; i < ST_N; i++)
h[i] = (float)(i % 100);
for (int k = 0; k < ST_NS; k++) {
if (cudaStreamCreate(&st[k]) != cudaSuccess)
return 1;
if (cudaMalloc(&d_x[k], sizeof(float) * ST_N) != cudaSuccess)
return 1;
cudaMemcpyAsync(d_x[k], h, sizeof(float) * ST_N,
cudaMemcpyHostToDevice, st[k]);
addv<<<(ST_N + 255) / 256, 256, 0, st[k]>>>(d_x[k], 7.0f, ST_N);
scale<<<(ST_N + 255) / 256, 256, 0, st[k]>>>(d_x[k], 3.0f, ST_N);
cudaGetLastError();
}
for (int k = 0; k < ST_NS; k++) {
cudaStreamSynchronize(st[k]);
cudaMemcpy(got, d_x[k], sizeof(float) * ST_N,
cudaMemcpyDeviceToHost);
for (int i = 0; i < ST_N; i++)
if (got[i] != ((float)(i % 100) + 7.0f) * 3.0f)
bad++;
cudaStreamDestroy(st[k]);
cudaFree(d_x[k]);
}
free(h);
free(got);
printf("RESULT mixed stream nstreams=%d n=%d bad=%d\n", ST_NS, ST_N,
bad);
return bad;
}
int main(int argc, char **argv)
{
if (p2_emit_mode(argc, argv)) {
printf("MAIL %s\n", MIX_MAIL);
printf("RESULT mixed mail bad=0\n");
printf("RESULT mixed vadd n=%d bad=0\n", VN);
printf("RESULT mixed red n=%d sum=%d bad=0\n", RD_N,
RD_N * (RD_N - 1) / 2);
printf("RESULT mixed grid2d nx=%d ny=%d bad=0\n", G2_NX, G2_NY);
printf("RESULT mixed stream nstreams=%d n=%d bad=0\n", ST_NS,
ST_N);
printf("RESULT mixed total bad=0\n");
return p2_status(0);
}
p2_device_info();
int bad = 0;
bad += phase_mail();
bad += phase_vadd();
bad += phase_reduce();
bad += phase_grid2d();
bad += phase_streams();
printf("RESULT mixed total bad=%d\n", bad);
return p2_status(bad);
}
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