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schbench: Avoid zero-page backed memory for matrices #12

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schbench: Avoid zero-page backed memory for matrices #12

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28 changes: 17 additions & 11 deletions schbench.c
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,7 @@
#include <string.h>
#include <math.h>
#include <linux/futex.h>
#include <sys/mman.h>
#include <sys/socket.h>
#include <sys/syscall.h>
#include <sys/sysinfo.h>
Expand Down Expand Up @@ -1541,6 +1542,7 @@ void *message_thread(void *arg)
{
struct thread_data *td = arg;
struct thread_data *worker_threads_mem = NULL;
unsigned long alloc_size;
int i;
int ret;

Expand All @@ -1561,18 +1563,19 @@ void *message_thread(void *arg)
if (worker_cpus)
pin_worker_cpus(worker_cpus);

/* Allocate based on private_matrix_size if using split, else use matrix_size */
if (private_matrix_size > 0)
alloc_size = private_matrix_size;
else
alloc_size = matrix_size;
alloc_size = 3 * sizeof(unsigned long) * alloc_size * alloc_size;

for (i = 0; i < worker_threads; i++) {
pthread_t tid;
unsigned long alloc_size;

/* Allocate based on private_matrix_size if using split, else use matrix_size */
if (private_matrix_size > 0)
alloc_size = private_matrix_size;
else
alloc_size = matrix_size;

worker_threads_mem[i].data = malloc(3 * sizeof(unsigned long) * alloc_size * alloc_size);
if (!worker_threads_mem[i].data) {
worker_threads_mem[i].data = mmap(NULL, alloc_size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON | MAP_POPULATE, -1, 0);
if (worker_threads_mem[i].data == MAP_FAILED) {
perror("unable to allocate ram");
pthread_exit((void *)-ENOMEM);
}
Expand Down Expand Up @@ -1858,6 +1861,7 @@ int main(int ac, char **av)
if (split_specified) {
unsigned long shared_cache_kb = (cache_footprint_kb * (100 - split_percent)) / 100;
unsigned long private_cache_kb = (cache_footprint_kb * split_percent) / 100;
unsigned long alloc_size;

shared_matrix_size = sqrt(shared_cache_kb * 1024 / 3 / sizeof(unsigned long));
private_matrix_size = sqrt(private_cache_kb * 1024 / 3 / sizeof(unsigned long));
Expand All @@ -1869,8 +1873,10 @@ int main(int ac, char **av)

/* Allocate shared data if needed */
if (shared_matrix_size > 0) {
shared_data = malloc(3 * sizeof(unsigned long) * shared_matrix_size * shared_matrix_size);
if (!shared_data) {
alloc_size = 3 * sizeof(unsigned long) * shared_matrix_size * shared_matrix_size;
shared_data = mmap(NULL, alloc_size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON | MAP_POPULATE, -1, 0);
if (shared_data == MAP_FAILED) {
perror("unable to allocate shared data");
exit(1);
}
Expand Down