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ex2!: 3 times height

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This commit is contained in:
Fredrik Robertsen
2025-09-10 18:58:38 +02:00
parent efd1fa4922
commit eb02c25559
2 changed files with 44 additions and 25 deletions
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5
exercise2/Makefile
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@@ -10,17 +10,16 @@ NPROC := 3
.PHONY: all clean run .PHONY: all clean run
all: clean run all: parallel
$(TARGET): $(SRC) $(TARGET): $(SRC)
mkdir -p $(OUTDIR)
$(CC) $(CFLAGS) -o $(OUT) $< $(CC) $(CFLAGS) -o $(OUT) $<
run: $(TARGET) run: $(TARGET)
cd $(OUTDIR) && ./$< $(ARGS) cd $(OUTDIR) && ./$< $(ARGS)
clean: clean:
rm -rf $(OUTDIR) rm -rf $(OUTDIR)/*
time: $(TARGET) time: $(TARGET)
python3 bench.py './$(OUT) 0' $(NBENCH) python3 bench.py './$(OUT) 0' $(NBENCH)

64
exercise2/mandel_mpi.c
View File

@@ -2,6 +2,7 @@
#include <mpi.h> #include <mpi.h>
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
#include <string.h>
#define XSIZE 2560 #define XSIZE 2560
#define YSIZE 2048 #define YSIZE 2048
@@ -22,6 +23,8 @@ typedef struct {
double real, imag; double real, imag;
} complex_t; } complex_t;
int rank, size;
void calculate() { void calculate() {
for (int i = 0; i < XSIZE; i++) { for (int i = 0; i < XSIZE; i++) {
for (int j = 0; j < YSIZE; j++) { for (int j = 0; j < YSIZE; j++) {
@@ -83,36 +86,53 @@ void fancycolour(uchar *p, int iter) {
int main(int argc, char **argv) { int main(int argc, char **argv) {
MPI_Init(&argc, &argv); MPI_Init(&argc, &argv);
int rank, size;
MPI_Comm_rank(MPI_COMM_WORLD, &rank); MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &size); MPI_Comm_size(MPI_COMM_WORLD, &size);
printf("hello from rank %d/%d", rank, size);
if (argc == 1) {
puts("Usage: MANDEL n");
puts("n decides whether image should be written to disk (1=yes, 0=no)");
return 0;
}
/* Calculate the range in the y-axis such that we preserve the
aspect ratio */
step = (xright - xleft) / XSIZE; step = (xright - xleft) / XSIZE;
yupper = ycenter + (step * YSIZE) / 2; double old_yupper = ycenter + (step * YSIZE) / 2;
ylower = ycenter - (step * YSIZE) / 2; double old_ylower = ycenter - (step * YSIZE) / 2;
double delta = (old_yupper - old_ylower) / size;
ylower = old_ylower + rank * delta;
yupper = old_ylower + (rank + 1) * delta;
calculate(); calculate();
if (strtol(argv[1], NULL, 10) != 0) { printf("after calculate %d\n", rank);
/* create nice image from iteration counts. take care to create it upside
down (bmp format) */ const int bufsize = XSIZE * YSIZE * 3;
unsigned char *buffer = calloc(XSIZE * YSIZE * 3, 1); unsigned char *buffer = calloc(bufsize, 1);
for (int i = 0; i < XSIZE; i++) { for (int i = 0; i < XSIZE; i++) {
for (int j = 0; j < YSIZE; j++) { for (int j = 0; j < YSIZE; j++) {
int p = ((YSIZE - j - 1) * XSIZE + i) * 3; int p = ((YSIZE - j - 1) * XSIZE + i) * 3;
fancycolour(buffer + p, pixel[PIXEL(i, j)]); fancycolour(buffer + p, pixel[PIXEL(i, j)]);
}
} }
/* write image to disk */
savebmp("mandel.bmp", buffer, XSIZE, YSIZE);
} }
printf("after buffer %d\n", rank);
if (rank != 0)
MPI_Send(buffer, bufsize, MPI_INT8_T, 0, 0, MPI_COMM_WORLD);
printf("hello again from %d\n", rank);
// use process 0 as central process: gather calulations and output image
if (rank == 0) {
unsigned char *bufferest = calloc(bufsize * size, 1);
memcpy(bufferest, buffer, bufsize);
printf("after memcpy\n");
for (int i = 1; i < size; i++) {
MPI_Recv(buffer, bufsize, MPI_INT8_T, i, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
memcpy(bufferest + bufsize * i, buffer, bufsize);
}
printf("after loop\n");
savebmp("mandel.bmp", buffer, XSIZE, YSIZE * size);
printf("after save\n");
}
MPI_Finalize(); MPI_Finalize();
return 0; return 0;
} }