From 642b5fb0007b64c77d186fcb018d571152ee1d47 Mon Sep 17 00:00:00 2001 From: dzwdz Date: Mon, 14 Aug 2023 18:51:07 +0200 Subject: reorganization: first steps --- src/cmd/iostress/iostress.c | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 src/cmd/iostress/iostress.c (limited to 'src/cmd/iostress/iostress.c') diff --git a/src/cmd/iostress/iostress.c b/src/cmd/iostress/iostress.c new file mode 100644 index 0000000..ac555de --- /dev/null +++ b/src/cmd/iostress/iostress.c @@ -0,0 +1,43 @@ +#include +#include +#include +#include +#include + +int main(int argc, char **argv) { + long num_runs = 4; + long num_calls = 512; + long num_bytes = 1; + uint64_t *results; + char *inbuf; + + if (argc > 1) num_runs = strtol(argv[1], NULL, 0); + if (argc > 2) num_calls = strtol(argv[2], NULL, 0); + if (argc > 3) num_bytes = strtol(argv[3], NULL, 0); + if (argc > 4 || num_runs == 0 || num_calls == 0) { + fprintf(stderr, "usage: %s [num_runs] [num_calls] [num_bytes]\n", argv[0]); + return 1; + } + + results = malloc(sizeof(*results) * num_runs); + inbuf = malloc(num_bytes); + memset(inbuf, '.', num_bytes); + + for (long i = 0; i < num_runs; i++) { + uint64_t time = __rdtsc(); + for (long j = 0; j < num_calls; j++) + _sys_write(1, inbuf, num_bytes, -1, 0); + results[i] = __rdtsc() - time; + _sys_write(1, "\n", 1, -1, 0); + } + + uint64_t total = 0; + for (long i = 0; i < num_runs; i++) { + uint64_t scaled = results[i] / 3000; + total += scaled; + fprintf(stderr, "run %ld: %lu\n", i, scaled); + } + fprintf(stderr, "%lu calls, %lu bytes. avg %lu\n", num_calls, num_bytes, total / num_runs); + + return 0; +} -- cgit v1.2.3