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Add option to set the base object size #50

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Add option to set the base object size #50

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20 changes: 17 additions & 3 deletions multichase.c
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Original file line number Diff line number Diff line change
Expand Up @@ -548,6 +548,7 @@ int main(int argc, char **argv) {
size_t nr_samples = DEF_NR_SAMPLES;
size_t cache_flush_size = DEF_CACHE_FLUSH;
size_t offset = DEF_OFFSET;
size_t base_object_size = 0;
int print_average = 0;
const char *extra_args = NULL;
const char *chase_optarg = chases[0].name;
Expand Down Expand Up @@ -669,6 +670,14 @@ int main(int argc, char **argv) {
exit(1);
}
break;
case 'S':
if (parse_mem_arg(optarg, &base_object_size)) {
fprintf(stderr,
"base_object_size must be a non-negative integer (suffixed "
"with k, m, or g)\n");
exit(1);
}
break;
case 'T':
if (parse_mem_arg(optarg, &genchase_args.tlb_locality)) {
fprintf(stderr,
Expand Down Expand Up @@ -745,6 +754,8 @@ int main(int argc, char **argv) {
"-o perform an ordered traversal (rather than random)\n");
fprintf(stderr, "-O nnnn[kmg] offset the entire chase by nnnn bytes\n");
fprintf(stderr, "-s nnnn[kmg] stride size (default %zu)\n", DEF_STRIDE);
fprintf(stderr, "-S nnnn[kmg] base object size in bytes, default set by"
" the chase\n");
fprintf(stderr, "-T nnnn[kmg] TLB locality in bytes (default %zu)\n",
DEF_TLB_LOCALITY * default_page_size);
fprintf(stderr,
Expand Down Expand Up @@ -805,19 +816,22 @@ int main(int argc, char **argv) {
genchase_args.total_memory % genchase_args.tlb_locality;
}

if (chase->base_object_size > base_object_size) {
base_object_size = chase->base_object_size;
}
genchase_args.nr_mixer_indices =
genchase_args.stride / chase->base_object_size;
genchase_args.stride / base_object_size;
if (genchase_args.nr_mixer_indices < nr_threads * chase->parallelism) {
fprintf(stderr,
"the stride is too small to interleave that many threads, need at "
"least %zu bytes\n",
nr_threads * chase->parallelism * chase->base_object_size);
nr_threads * chase->parallelism * base_object_size);
exit(1);
}

if (verbosity > 0) {
printf("nr_mixer_indices = %zu\n", genchase_args.nr_mixer_indices);
printf("base_object_size = %zu\n", chase->base_object_size);
printf("base_object_size = %zu\n", base_object_size);
printf("nr_threads = %zu\n", nr_threads);
print_page_size(page_size, use_thp);
printf("total_memory = %zu (%.1f MiB)\n", genchase_args.total_memory,
Expand Down