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Use mt19937 as PRNG 

Reasons: It's faster than rand() and can be made thread-safe
This commit is contained in:
Peter Keresztes Schmidt 2021-10-12 19:18:21 +02:00
parent c027b7a38d
commit cd45c61555
1 changed files with 7 additions and 6 deletions
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13
src/zmbenchmark.cpp
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@ -19,8 +19,9 @@
#include <algorithm> #include <algorithm>
#include <cassert> #include <cassert>
#include <memory>
#include <cstdlib> #include <cstdlib>
#include <memory>
#include <random>
#include <utility> #include <utility>
#include "zm_config.h" #include "zm_config.h"
@ -30,6 +31,8 @@
#include "zm_utils.h" #include "zm_utils.h"
#include "zm_zone.h" #include "zm_zone.h"
static std::mt19937 mt_rand(111);
// //
// This allows you to feed in a set of columns and timing rows, and print it // This allows you to feed in a set of columns and timing rows, and print it
// out in a nice-looking table. // out in a nice-looking table.
@ -142,13 +145,13 @@ std::shared_ptr<Image> GenerateRandomImage(
// Now randomize the pixels inside a box. // Now randomize the pixels inside a box.
const int box_width = (width * change_box_percent) / 100; const int box_width = (width * change_box_percent) / 100;
const int box_height = (height * change_box_percent) / 100; const int box_height = (height * change_box_percent) / 100;
const int box_x = (int) ((uint64_t) rand() * (width - box_width) / RAND_MAX); const int box_x = (int) ((uint64_t) mt_rand() * (width - box_width) / RAND_MAX);
const int box_y = (int) ((uint64_t) rand() * (height - box_height) / RAND_MAX); const int box_y = (int) ((uint64_t) mt_rand() * (height - box_height) / RAND_MAX);
for (int y = 0 ; y < box_height ; y++) { for (int y = 0 ; y < box_height ; y++) {
uint8_t *row = (uint8_t *) image->Buffer(box_x, box_y + y); uint8_t *row = (uint8_t *) image->Buffer(box_x, box_y + y);
for (int x = 0 ; x < box_width ; x++) { for (int x = 0 ; x < box_width ; x++) {
row[x] = (uint8_t) rand(); row[x] = (uint8_t) mt_rand();
} }
} }
@ -295,8 +298,6 @@ void RunDetectMotionBenchmarks(
} }
int main(int argc, char *argv[]) { int main(int argc, char *argv[]) {
srand(111);
// Init global stuff that we need. // Init global stuff that we need.
config.font_file_location = "../fonts/default.zmfnt"; config.font_file_location = "../fonts/default.zmfnt";
config.event_close_mode = "time"; config.event_close_mode = "time";