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normalize & cumsum array in one for loop.

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This commit is contained in:
NunoSempere 2023-06-03 00:41:09 -06:00
parent 52260630de
commit 15e65534e4
3 changed files with 22 additions and 10 deletions
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8
C/makefile
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@ -33,14 +33,12 @@ FORMATTER=clang-format -i -style=$(STYLE_BLUEPRINT)
## make build
build: $(SRC)
$(CC) $(OPTIMIZED) $(DEBUG) $(SRC) $(OPENMP) $(MATH) -o $(OUTPUT)
$(CC) $(OPTIMIZED) $(DEBUG) $(SRC_ONE_THREAD) $(OPENMP) $(MATH) -o $(OUTPUT_ONE_THREAD)
format: $(SRC)
$(FORMATTER) $(SRC)
run: $(SRC) $(OUTPUT)
OMP_NUM_THREADS=1 ./$(OUTPUT) && echo
./$(OUTPUT_ONE_THREAD)
multi:
OMP_NUM_THREADS=1 ./$(OUTPUT) && echo
@ -48,7 +46,6 @@ multi:
OMP_NUM_THREADS=4 ./$(OUTPUT) && echo
OMP_NUM_THREADS=8 ./$(OUTPUT) && echo
OMP_NUM_THREADS=16 ./$(OUTPUT) && echo
./$(OUTPUT_ONE_THREAD) && echo
time-linux:
@echo "Requires /bin/time, found on GNU/Linux systems" && echo
@ -68,6 +65,10 @@ time-linux:
@echo "Running 100x and taking avg time: OMP_NUM_THREADS=16 $(OUTPUT)"
@t=$$(/usr/bin/time -f "%e" -p bash -c 'for i in {1..100}; do OMP_NUM_THREADS=16 $(OUTPUT); done' 2>&1 >/dev/null | grep real | awk '{print $$2}' ); echo "scale=2; 1000 * $$t / 100" | bc | sed "s|^|Time using 16 threads: |" | sed 's|$$|ms|' && echo
time-linux-fastest:
@echo "Running 100x and taking avg time: OMP_NUM_THREADS=16 $(OUTPUT)"
@t=$$(/usr/bin/time -f "%e" -p bash -c 'for i in {1..100}; do OMP_NUM_THREADS=16 $(OUTPUT); done' 2>&1 >/dev/null | grep real | awk '{print $$2}' ); echo "scale=2; 1000 * $$t / 100" | bc | sed "s|^|Time using 16 threads: |" | sed 's|$$|ms|' && echo
time-linux-simple:
@echo "Requires /bin/time, found on GNU/Linux systems" && echo
OMP_NUM_THREADS=1 /bin/time -f "Time: %es" ./$(OUTPUT) && echo
@ -75,7 +76,6 @@ time-linux-simple:
OMP_NUM_THREADS=4 /bin/time -f "Time: %es" ./$(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:
sudo apt-get install libomp-dev

BIN
C/out/samples
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22
C/samples.c
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@ -128,18 +128,28 @@ void mixture(float (*samplers[])(unsigned int*), float* weights, int n_dists, fl
// You can see a simpler version of this function in the git history
// or in C-02-better-algorithm-one-thread/
float sum_weights = array_sum(weights, n_dists);
float* normalized_weights = malloc(n_dists * sizeof(float));
/*float* normalized_weights = malloc(n_dists * sizeof(float));
// float normalized_weights[n_dists];
for (int i = 0; i < n_dists; i++) {
normalized_weights[i] = weights[i] / sum_weights;
}
float* cummulative_weights = malloc(n_dists * sizeof(float));
// float cummulative_weights[n_dists];
array_cumsum(normalized_weights, cummulative_weights, n_dists);
*/
float* cumsummed_normalized_weights = malloc(n_dists * sizeof(float));
cumsummed_normalized_weights[0] = weights[0]/sum_weights;
for (int i = 1; i < n_dists; i++) {
cumsummed_normalized_weights[i] = cumsummed_normalized_weights[i - 1] + weights[i]/sum_weights;
}
//create var holders
float p1;
int sample_index, i, own_length;
unsigned int* seeds[n_threads];
// unsigned int* seeds[n_threads];
unsigned int** seeds = malloc(n_threads * sizeof(unsigned int*));
for (unsigned int i = 0; i < n_threads; i++) {
seeds[i] = malloc(sizeof(unsigned int));
*seeds[i] = i;
@ -153,7 +163,7 @@ void mixture(float (*samplers[])(unsigned int*), float* weights, int n_dists, fl
for (int j = 0; j < own_length; j++) {
p1 = random_uniform(0, 1, seeds[i]);
for (int k = 0; k < n_dists; k++) {
if (p1 < cummulative_weights[k]) {
if (p1 < cumsummed_normalized_weights[k]) {
results[i][j] = samplers[k](seeds[i]);
break;
}
@ -161,11 +171,13 @@ void mixture(float (*samplers[])(unsigned int*), float* weights, int n_dists, fl
}
}
}
free(normalized_weights);
free(cummulative_weights);
// free(normalized_weights);
// free(cummulative_weights);
free(cumsummed_normalized_weights);
for (unsigned int i = 0; i < n_threads; i++) {
free(seeds[i]);
}
free(seeds);
}
// Functions used for the BOTEC.