fix memory leaks

week05/ex3.c

@@ -84,8 +84,12 @@ int main(int argc, char *argv[]) {
       TODO
       Free the allocated memory.
     */
-    for (int i = 0; i < n_threads; i++)
+    for (int i = 0; i < n_threads; ++i) {
         free(results[i]);
+    }
+    free(threads);
+    free(results);
+    free(requests);
 
     printf("%d\n", total_result);
 

week05/ex3.txt

@@ -1,15 +1,15 @@
 time ./ex3 10000000 1
-10.82user 0.00system 0:10.88elapsed 99%CPU (0avgtext+0avgdata 1576maxresident)k
-0inputs+0outputs (0major+75minor)pagefaults 0swaps
+10.29user 0.01system 0:10.30elapsed 99%CPU (0avgtext+0avgdata 1648maxresident)k
+0inputs+0outputs (0major+76minor)pagefaults 0swaps
 time ./ex3 10000000 2
-11.17user 0.05system 0:07.02elapsed 159%CPU (0avgtext+0avgdata 1640maxresident)k
-0inputs+0outputs (0major+78minor)pagefaults 0swaps
+10.69user 0.00system 0:06.72elapsed 159%CPU (0avgtext+0avgdata 1692maxresident)k
+0inputs+0outputs (0major+79minor)pagefaults 0swaps
 time ./ex3 10000000 4
-11.66user 0.16system 0:03.95elapsed 298%CPU (0avgtext+0avgdata 3056maxresident)k
-0inputs+0outputs (0major+86minor)pagefaults 0swaps
+11.63user 0.01system 0:03.84elapsed 302%CPU (0avgtext+0avgdata 3128maxresident)k
+0inputs+0outputs (0major+84minor)pagefaults 0swaps
 time ./ex3 10000000 10
-20.34user 0.33system 0:03.04elapsed 679%CPU (0avgtext+0avgdata 3528maxresident)k
-0inputs+0outputs (0major+105minor)pagefaults 0swaps
+20.63user 0.00system 0:03.13elapsed 657%CPU (0avgtext+0avgdata 5120maxresident)k
+0inputs+0outputs (0major+102minor)pagefaults 0swaps
 time ./ex3 10000000 100
-22.07user 0.15system 0:02.98elapsed 744%CPU (0avgtext+0avgdata 5744maxresident)k
-0inputs+0outputs (0major+348minor)pagefaults 0swaps
+22.58user 0.00system 0:02.96elapsed 761%CPU (0avgtext+0avgdata 5916maxresident)k
+0inputs+0outputs (0major+345minor)pagefaults 0swaps

week05/ex4.c

@@ -79,6 +79,7 @@ int main(int argc, char *argv[]) {
       Free the allocated memory.
     */
     pthread_mutex_destroy(&global_lock);
+    free(threads);
 
     printf("%d\n", primes_found_so_far);
     exit(EXIT_SUCCESS);

week05/ex4.explanation.txt

@@ -1,7 +1,8 @@
 The execution time is almost the same as ex3.
 But, in this case, after increasing number of threads
-4->10 and 10->100, the execution time is
-insignificantly increasing. It is probably caused by
+4->10 and 10->100, the execution time sometimes
+insignificantly increased (it happened before
+several times). It is probably caused by
 mutexes, since they don't allow multiple threads run
 the locked code at the same time. The number of
 threads is way higher than the number of physical

week05/ex4.txt

@@ -1,15 +1,15 @@
 time ./ex4 10000000 1
-10.27user 0.00system 0:10.36elapsed 99%CPU (0avgtext+0avgdata 1720maxresident)k
-0inputs+0outputs (0major+78minor)pagefaults 0swaps
-time ./ex4 10000000 2
-10.65user 0.02system 0:05.38elapsed 198%CPU (0avgtext+0avgdata 1588maxresident)k
+10.31user 0.00system 0:10.31elapsed 100%CPU (0avgtext+0avgdata 1636maxresident)k
 0inputs+0outputs (0major+76minor)pagefaults 0swaps
+time ./ex4 10000000 2
+10.71user 0.02system 0:05.37elapsed 199%CPU (0avgtext+0avgdata 1556maxresident)k
+0inputs+0outputs (0major+77minor)pagefaults 0swaps
 time ./ex4 10000000 4
-12.35user 0.14system 0:03.15elapsed 396%CPU (0avgtext+0avgdata 1548maxresident)k
-0inputs+0outputs (0major+80minor)pagefaults 0swaps
+12.26user 0.14system 0:03.11elapsed 398%CPU (0avgtext+0avgdata 1540maxresident)k
+0inputs+0outputs (0major+81minor)pagefaults 0swaps
 time ./ex4 10000000 10
-20.43user 0.81system 0:03.25elapsed 652%CPU (0avgtext+0avgdata 1672maxresident)k
-0inputs+0outputs (0major+98minor)pagefaults 0swaps
+22.42user 0.52system 0:03.01elapsed 762%CPU (0avgtext+0avgdata 1572maxresident)k
+0inputs+0outputs (0major+93minor)pagefaults 0swaps
 time ./ex4 10000000 100
-20.05user 0.80system 0:03.28elapsed 634%CPU (0avgtext+0avgdata 2116maxresident)k
-0inputs+0outputs (0major+281minor)pagefaults 0swaps
+22.42user 0.60system 0:02.99elapsed 769%CPU (0avgtext+0avgdata 5840maxresident)k
+0inputs+0outputs (0major+280minor)pagefaults 0swaps