Should work
parent
bb5db76bdc
commit
dc7147eb8d
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dn3/server
BIN
dn3/server
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28
dn3/server.c
28
dn3/server.c
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@ -5,7 +5,7 @@
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#include <unistd.h>
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#include <math.h>
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#define N_THREADS 8
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#define N_THREADS 9
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#define N_DIMENSIONS 200000000
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pthread_barrier_t b;
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@ -14,6 +14,10 @@ long *q_s;
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double res[N_THREADS];
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int active_threads[N_THREADS];
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// odd number of threads lock
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pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
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pthread_spinlock_t slock;
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void setup() {
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p_s = (long *) malloc(N_DIMENSIONS * sizeof(long));
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q_s = (long *) malloc(N_DIMENSIONS * sizeof(long));
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@ -40,6 +44,16 @@ void *calculate(void* arg) {
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pthread_barrier_wait( &b );
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int n_threads = N_THREADS;
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if(n_threads % 2 == 1) {
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if ( *myrank == N_THREADS - 1) {
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res[*myrank - 1] += res[*myrank];
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active_threads[*myrank] = -1;
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}
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n_threads--;
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}
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pthread_barrier_wait( &b );
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if (n_threads != 1) {
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@ -76,11 +90,14 @@ int main() {
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double dt = omp_get_wtime(); // start timing
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int p[N_THREADS];
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if(N_THREADS %2 != 0 && N_THREADS >= 2) {
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printf("Number of threads must be even!\n");
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return 1;
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}
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//if(N_THREADS %2 != 0 && N_THREADS >= 2) {
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// printf("Number of threads must be even!\n");
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// return 1;
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//}
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//
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// barrier & lock
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pthread_barrier_init( &b, NULL, N_THREADS );
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pthread_spin_init(&slock, PTHREAD_PROCESS_PRIVATE);
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for(int i = 0; i < N_THREADS; i++ ) {
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p[i] = i;
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@ -90,6 +107,7 @@ int main() {
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for(int i=0; i<N_THREADS; i++)
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pthread_join(t[i], NULL);
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pthread_spin_destroy(&slock);
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dt = omp_get_wtime() - dt; // finish timing
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printf("Execution time: %lf, caluclation result: %lf ", dt, sqrt(res[0]));
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