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/* Copyright 2025 Joshua Bakita
* Simple kernel that uses measure_launch_oh to measure how long CUDA
* initialization takes.
* Prints status to stderr and nothing to stdout.
*/
#include <time.h> // clock_gettime()
#include <stdio.h> // fprintf(), perror()
#include <stdlib.h> // putenv()
#include <string.h> // strcmp()
#include <unistd.h> // execve()
extern char **environ;
#include "testbench.h"
static char* child_argv_default[3] = {"./measure_launch_oh", "1", NULL};
int main(int argc, char **argv) {
struct timespec start;
if (argc == 2 && (!strcmp(argv[1], "--help") || !strcmp(argv[1], "-h"))) {
fprintf(stderr, "Usage: %s [-e environment var to apply to child (optional) | prog prog_arg...]\n", argv[0]);
return 1;
}
char **child_argv = child_argv_default;
if (argv[1]) {
// Change env
// (Use this to apply LD_PRELOAD to the child only)
if (!strcmp(argv[1], "-e"))
putenv(argv[2]);
// Special exec (e.g., ./nvtaskset --gpc-list 0 ./measure_launch_oh 1)
else
child_argv = &argv[1];
}
clock_gettime(CLOCK_MONOTONIC_RAW, &start);
fprintf(stderr, "(%d) Starting '%s' at CLOCK_MONOTONIC_RAW = %ld ns\n",
getpid(), child_argv[0], time2ns(start));
if (execve(child_argv[0], child_argv, environ)) {
perror("Unable to start subprogram");
return 1;
}
return 0;
}
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