Transfer equal amount of bytes during each block

[membench] / membench.c

diff --git a/membench.c b/membench.c
index b73bdefeb03e449b782e020f52be5cfcedb40745..e99e6ea047ff2b0512e73b8497b5184d6427b4f5 100644 (file)
--- a/membench.c
+++ b/membench.c
@@ -4,9 +4,9 @@
 
 #define lsize sizeof(unsigned long)
 
-long usec_diff(const struct timeval *a, const struct timeval *b)
+long long usec_diff(const struct timeval *a, const struct timeval *b)
 {
-       long usec_a, usec_b;
+       long long usec_a, usec_b;
        usec_a = a->tv_sec * 1000000 + a->tv_usec;
        usec_b = b->tv_sec * 1000000 + b->tv_usec;
        return usec_b - usec_a;
@@ -18,21 +18,24 @@ int main(int argc, char *argv[])
        unsigned long *buf, i, tmp = 0;
        struct timeval start, end;
 
+       printf("Benchmark sequential access bandwidth "
+               "and random access latency\n\n");
+
        if (argc > 1)
                iterations = atoi(argv[1]);
        else
                iterations = 24;
 
        if (argc > 2)
-               count = atoi(argv[2]);
+               count = atoi(argv[2]) * 1024;
        else
-               count = 1024;
+               count = 1024 * 64;
        latcount = count / 10;
 
        printf("Doing %d runs with buffer size goin up to %dk\n",
               iterations, 1 << (iterations - 10));
        printf("Running each round %d times\n", count);
-       printf("Size of unsigned long is %lu bits\n\n", lsize * 8);
+       printf("Size of unsigned long is %d bits\n\n", (int)lsize * 8);
 
        switch (lsize) {
        case 4:
@@ -74,7 +77,7 @@ int main(int argc, char *argv[])
                for (i = 0; i < size; i++)
                        buf[i] = i;
 
-               printf("%8luk |", size * lsize / 1024);
+               printf("%8dk |", (int)(size * lsize / 1024));
 
                /* Read bandwidth*/
 
@@ -139,6 +142,11 @@ int main(int argc, char *argv[])
        
                printf("\n");
 
+               count /= 2;
+               count = count ? count : 1;
+               latcount = count / 10;
+               latcount = latcount ? latcount : 1;
+
                free(buf);
        }
        return 0;