Files
UnrealEngine/Engine/Source/ThirdParty/Blosc/c-blosc-1.21.0/examples/multithread.c
2025-05-18 13:04:45 +08:00

101 lines
2.6 KiB
C

/*
Copyright (C) 2014 Francesc Alted
http://blosc.org
License: MIT (see LICENSE.txt)
Example program demonstrating use of the Blosc filter from C code.
To compile this program using gcc or clang:
gcc/clang multithread.c -o multithread -lblosc -lpthread
or, if you don't have the blosc library installed:
gcc -O3 -msse2 multithread.c ../blosc/!(*avx2*)*.c -I../blosc -o multithread -lpthread
Using MSVC on Windows:
cl /Ox /Femultithread.exe /Iblosc multithread.c blosc\*.c
To run:
$ ./multithread
Blosc version info: 1.4.2.dev ($Date:: 2014-07-08 #$)
Using 1 threads (previously using 1)
Compression: 4000000 -> 158494 (25.2x)
Succesful roundtrip!
Using 2 threads (previously using 1)
Compression: 4000000 -> 158494 (25.2x)
Succesful roundtrip!
Using 3 threads (previously using 2)
Compression: 4000000 -> 158494 (25.2x)
Succesful roundtrip!
Using 4 threads (previously using 3)
Compression: 4000000 -> 158494 (25.2x)
Succesful roundtrip!
*/
#include <stdio.h>
#include <blosc.h>
#define SIZE 1000*1000
int main(){
static float data[SIZE];
static float data_out[SIZE];
static float data_dest[SIZE];
int isize = SIZE*sizeof(float), osize = SIZE*sizeof(float);
int dsize = SIZE*sizeof(float), csize;
int nthreads, pnthreads, i;
for(i=0; i<SIZE; i++){
data[i] = i;
}
/* Register the filter with the library */
printf("Blosc version info: %s (%s)\n",
BLOSC_VERSION_STRING, BLOSC_VERSION_DATE);
/* Initialize the Blosc compressor */
blosc_init();
/* Tell Blosc to use some number of threads */
for (nthreads=1; nthreads <= 4; nthreads++) {
pnthreads = blosc_set_nthreads(nthreads);
printf("Using %d threads (previously using %d)\n", nthreads, pnthreads);
/* Compress with clevel=5 and shuffle active */
csize = blosc_compress(5, 1, sizeof(float), isize, data, data_out, osize);
if (csize < 0) {
printf("Compression error. Error code: %d\n", csize);
return csize;
}
printf("Compression: %d -> %d (%.1fx)\n", isize, csize, (1.*isize) / csize);
/* Decompress */
dsize = blosc_decompress(data_out, data_dest, dsize);
if (dsize < 0) {
printf("Decompression error. Error code: %d\n", dsize);
return dsize;
}
for(i=0;i<SIZE;i++){
if(data[i] != data_dest[i]) {
printf("Decompressed data differs from original!\n");
return -1;
}
}
printf("Succesful roundtrip!\n");
}
/* After using it, destroy the Blosc environment */
blosc_destroy();
return 0;
}