time-to-botec

commit 6b34d9abdb5a44fb2bddb2656ae522c61c2ce1f8
parent 58c74ce37d839977877f35b4bb41ac09a83e7c14
Author: NunoSempere <nuno.sempere@protonmail.com>
Date:   Fri,  2 Jun 2023 12:50:51 -0600

feat: add more threads, document rand_r in code.

Diffstat:
M
C-optimized/makefile
 | 
4
++++
M
C-optimized/out/samples
 | 
0

M
C-optimized/samples.c
 | 
4
+++-

3 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/C-optimized/makefile b/C-optimized/makefile
@@ -46,6 +46,8 @@ multi:
 	OMP_NUM_THREADS=1 ./$(OUTPUT) && echo
 	OMP_NUM_THREADS=2 ./$(OUTPUT) && echo
 	OMP_NUM_THREADS=4 ./$(OUTPUT) && echo
+	OMP_NUM_THREADS=8 ./$(OUTPUT) && echo
+	OMP_NUM_THREADS=16 ./$(OUTPUT) && echo
 	./$(OUTPUT_ONE_THREAD) && echo
 
 time-linux:
@@ -53,6 +55,8 @@ time-linux:
 	OMP_NUM_THREADS=1 /bin/time -f "Time: %es" ./$(OUTPUT) && echo
 	OMP_NUM_THREADS=2 /bin/time -f "Time: %es" ./$(OUTPUT) && echo
 	OMP_NUM_THREADS=4 /bin/time -f "Time: %es" ./$(OUTPUT) && echo
+	OMP_NUM_THREADS=8 /bin/time -f "Time: %es" ./$(OUTPUT) && echo
+	OMP_NUM_THREADS=16 /bin/time -f "Time: %es" ./$(OUTPUT) && echo
 	/bin/time -f "Time: %es" ./$(OUTPUT_ONE_THREAD) && echo
 
 debian-install-dependencies:
diff --git a/C-optimized/out/samples b/C-optimized/out/samples
Binary files differ.
diff --git a/C-optimized/samples.c b/C-optimized/samples.c
@@ -6,7 +6,7 @@
 
 const float PI = 3.14159265358979323846;
 
-#define N 100000000
+#define N 10000000
 
 //Array helpers
 
@@ -50,6 +50,8 @@ void array_cumsum(float* array_to_sum, float* array_cumsummed, int length)
 float rand_float(float to, unsigned int* seed)
 {
     return ((float)rand_r(seed) / (float)RAND_MAX) * to;
+		// See: <https://stackoverflow.com/questions/43151361/how-to-create-thread-safe-random-number-generator-in-c-using-rand-r>
+		// rand() is not thread-safe, as it relies on (shared) hidden state.
 }
 
 float ur_normal(unsigned int* seed)