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Use wall time (not CPU time) in dotproduct bench #1

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Use wall time (not CPU time) in dotproduct bench #1

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11 changes: 7 additions & 4 deletions u3_interpreters/concur/vec/tests.c
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
#include "vendor/unity.h"

#include <sys/time.h>
#include "vec.h"

extern data_t dotproduct(vec_ptr, vec_ptr);
Expand Down Expand Up @@ -49,15 +50,17 @@ void test_longer(void) {

long expected = (2 * n * n * n + 3 * n * n + n) / 6;

clock_t start = clock();
struct timeval start, stop;
gettimeofday(&start, NULL);
long actual = dotproduct(u, v);
clock_t end = clock();
gettimeofday(&stop, NULL);


TEST_ASSERT_EQUAL(expected, actual);
double time_elapsed = (end - start) / (double)CLOCKS_PER_SEC;
double elapsed = stop.tv_sec - start.tv_sec + (stop.tv_usec - start.tv_usec) / 1000000.0;
printf(
"%0.2fs to take product of length %ld vectors (%0.2f ns per element)\n",
time_elapsed, n, time_elapsed * 1e9 / n);
elapsed, n, elapsed * 1e9 / n);

free_vec(u);
free_vec(v);
Expand Down