void busywait(void * msec)
{
long long waitmsec = *((long long*) msec);
long long msbefore;
long long msafter;
struct timespec spec;
clock_gettime(CLOCK_REALTIME, &spec);
srand(spec.tv_nsec);
long randomval = rand();
clock_gettime(CLOCK_REALTIME, &spec);
msbefore = timespecToMs(spec);
while(1) {
if (randomval < 2135116019) {
randomval = randomval + 1;
}
clock_gettime(CLOCK_REALTIME, &spec);
msafter = timespecToMs(spec);
if((msafter-msbefore) > waitmsec) {
break;
}
}
}
int main()
{
int numThreads = 1;
struct timespec tspec;
double x = 0.001643721971153, y = 0.8224676332988;
double zoom = 0.5;
long long withpool, before;
colorPalette * c = color_createPalette(7);
color_setColor(c, 0, 0, 0, 0);
color_setColor(c, 0, 33, 109, 1);
color_setColor(c, 255, 192, 0, 2);
color_setColor(c, 255, 255, 255, 3);
color_setColor(c, 255, 192, 0, 4);
color_setColor(c, 96, 0, 16, 5);
color_setColor(c, 0, 0, 0, 6);
FILE *file;
file = fopen("./bin/times_nopool.csv","a+"); /* apend file (add text to a file)*/
fprintf(file, "---mandelbrot time test, no pool---\n");
fprintf(file, "imageSize = 512x512, iterations = 1000\n");
fprintf(file, "format: numThreads, time\n\n");
for (numThreads = 1; numThreads <= 128; numThreads += 2) {
//time
clock_gettime(CLOCK_REALTIME, &tspec);
before = timespecToMs(tspec);
renderImageTime(x, y, zoom, c, numThreads);
// withpool time
clock_gettime(CLOCK_REALTIME, &tspec);
withpool = timespecToMs(tspec) - before;
// save withpool results to file
fprintf(file,"%d, %d\n", numThreads*numThreads, withpool); /*writes*/
}
fclose(file);
return 0;
}
int main(int argc, char *argv[])
{
if ( argc != 3 ) {
printf("usage: %s numtasks poolsize\n", argv[0]);
exit(0);
}
int NUMTASKS = atoi(argv[1]); //1600 // 16000
int POOLSIZE = atoi(argv[2]); // 300 //868
struct timespec tspec;
long long withpool, nopool, before;
static long long waittime = 500;
clock_gettime(CLOCK_REALTIME, &tspec);
before = timespecToMs(tspec);
struct threadpool * pool = threadpool_create(POOLSIZE);
for (int i=0; i < NUMTASKS; ++i) {
threadpool_enqueue(pool, busywait, &waittime);
}
threadpool_destroy(pool);
clock_gettime(CLOCK_REALTIME, &tspec);
withpool = timespecToMs(tspec) - before;
clock_gettime(CLOCK_REALTIME, &tspec);
before = timespecToMs(tspec);
pthread_t threads[NUMTASKS];
for (int i=0; i < NUMTASKS; ++i) {
pthread_create(&threads[i], NULL, busypthread, &waittime);
}
for(int i=0; i < NUMTASKS; ++i) {
if(pthread_join(threads[i], NULL) != 0) {
exit(EXIT_FAILURE);
}
}
clock_gettime(CLOCK_REALTIME, &tspec);
nopool = timespecToMs(tspec) - before;
printf("Pool runtime: %lld\n",withpool);
printf("Naked runtime: %lld\n",nopool);
return 0;
}
// sets diffTimeMs parameter as well (appalling...)
bool waitingTooLong(struct timespec startTime, int threshold, time_t* diffTimeMs)
{
struct timespec endTime;
clock_gettime(CLOCK_MONOTONIC, &endTime);
*diffTimeMs = timespecToMs(diffTime(endTime, startTime));
if(*diffTimeMs > threshold)
return true;
return false;
}
