FreeBSD/Linux Kernel Cross Reference
sys/contrib/zstd/examples/streaming_compression_thread_pool.c

     /*
      * Copyright (c) Martin Liska, SUSE, Facebook, Inc.
      * All rights reserved.
      *
      * This source code is licensed under both the BSD-style license (found in the
      * LICENSE file in the root directory of this source tree) and the GPLv2 (found
      * in the COPYING file in the root directory of this source tree).
      * You may select, at your option, one of the above-listed licenses.
      */
    
    
    #include <stdio.h>     // printf
    #include <stdlib.h>    // free
    #include <string.h>    // memset, strcat, strlen
    #include <zstd.h>      // presumes zstd library is installed
    #include "common.h"    // Helper functions, CHECK(), and CHECK_ZSTD()
    #include <pthread.h>
    
    typedef struct compress_args
    {
      const char *fname;
      char *outName;
      int cLevel;
    #if defined(ZSTD_STATIC_LINKING_ONLY)
      ZSTD_threadPool *pool;
    #endif
    } compress_args_t;
    
    static void *compressFile_orDie(void *data)
    {
        const int nbThreads = 16;
    
        compress_args_t *args = (compress_args_t *)data;
        fprintf (stderr, "Starting compression of %s with level %d, using %d threads\n", args->fname, args->cLevel, nbThreads);
        /* Open the input and output files. */
        FILE* const fin  = fopen_orDie(args->fname, "rb");
        FILE* const fout = fopen_orDie(args->outName, "wb");
        /* Create the input and output buffers.
         * They may be any size, but we recommend using these functions to size them.
         * Performance will only suffer significantly for very tiny buffers.
         */
        size_t const buffInSize = ZSTD_CStreamInSize();
        void*  const buffIn  = malloc_orDie(buffInSize);
        size_t const buffOutSize = ZSTD_CStreamOutSize();
        void*  const buffOut = malloc_orDie(buffOutSize);
    
        /* Create the context. */
        ZSTD_CCtx* const cctx = ZSTD_createCCtx();
        CHECK(cctx != NULL, "ZSTD_createCCtx() failed!");
    
    #if defined(ZSTD_STATIC_LINKING_ONLY)
        size_t r = ZSTD_CCtx_refThreadPool(cctx, args->pool);
        CHECK(r == 0, "ZSTD_CCtx_refThreadPool failed!");
    #endif
    
        /* Set any parameters you want.
         * Here we set the compression level, and enable the checksum.
         */
        CHECK_ZSTD( ZSTD_CCtx_setParameter(cctx, ZSTD_c_compressionLevel, args->cLevel) );
        CHECK_ZSTD( ZSTD_CCtx_setParameter(cctx, ZSTD_c_checksumFlag, 1) );
        ZSTD_CCtx_setParameter(cctx, ZSTD_c_nbWorkers, nbThreads);
    
        /* This loop reads from the input file, compresses that entire chunk,
         * and writes all output produced to the output file.
         */
        size_t const toRead = buffInSize;
        for (;;) {
            size_t read = fread_orDie(buffIn, toRead, fin);
            /* Select the flush mode.
             * If the read may not be finished (read == toRead) we use
             * ZSTD_e_continue. If this is the last chunk, we use ZSTD_e_end.
             * Zstd optimizes the case where the first flush mode is ZSTD_e_end,
             * since it knows it is compressing the entire source in one pass.
             */
            int const lastChunk = (read < toRead);
            ZSTD_EndDirective const mode = lastChunk ? ZSTD_e_end : ZSTD_e_continue;
            /* Set the input buffer to what we just read.
             * We compress until the input buffer is empty, each time flushing the
             * output.
             */
            ZSTD_inBuffer input = { buffIn, read, 0 };
            int finished;
            do {
                /* Compress into the output buffer and write all of the output to
                 * the file so we can reuse the buffer next iteration.
                 */
                ZSTD_outBuffer output = { buffOut, buffOutSize, 0 };
                size_t const remaining = ZSTD_compressStream2(cctx, &output , &input, mode);
                CHECK_ZSTD(remaining);
                fwrite_orDie(buffOut, output.pos, fout);
                /* If we're on the last chunk we're finished when zstd returns 0,
                 * which means its consumed all the input AND finished the frame.
                 * Otherwise, we're finished when we've consumed all the input.
                 */
                finished = lastChunk ? (remaining == 0) : (input.pos == input.size);
            } while (!finished);
            CHECK(input.pos == input.size,
                  "Impossible: zstd only returns 0 when the input is completely consumed!");
    
           if (lastChunk) {
               break;
           }
       }
   
       fprintf (stderr, "Finishing compression of %s\n", args->outName);
   
       ZSTD_freeCCtx(cctx);
       fclose_orDie(fout);
       fclose_orDie(fin);
       free(buffIn);
       free(buffOut);
       free(args->outName);
   
       return NULL;
   }
   
   
   static char* createOutFilename_orDie(const char* filename)
   {
       size_t const inL = strlen(filename);
       size_t const outL = inL + 5;
       void* const outSpace = malloc_orDie(outL);
       memset(outSpace, 0, outL);
       strcat(outSpace, filename);
       strcat(outSpace, ".zst");
       return (char*)outSpace;
   }
   
   int main(int argc, const char** argv)
   {
       const char* const exeName = argv[0];
   
       if (argc<=3) {
           printf("wrong arguments\n");
           printf("usage:\n");
           printf("%s POOL_SIZE LEVEL FILES\n", exeName);
           return 1;
       }
   
       int pool_size = atoi (argv[1]);
       CHECK(pool_size != 0, "can't parse POOL_SIZE!");
   
       int level = atoi (argv[2]);
       CHECK(level != 0, "can't parse LEVEL!");
   
       argc -= 3;
       argv += 3;
   
   #if defined(ZSTD_STATIC_LINKING_ONLY)
       ZSTD_threadPool *pool = ZSTD_createThreadPool (pool_size);
       CHECK(pool != NULL, "ZSTD_createThreadPool() failed!");
       fprintf (stderr, "Using shared thread pool of size %d\n", pool_size);
   #else
       fprintf (stderr, "All threads use its own thread pool\n");
   #endif
   
       pthread_t *threads = malloc_orDie(argc * sizeof(pthread_t));
       compress_args_t *args = malloc_orDie(argc * sizeof(compress_args_t));
   
       for (unsigned i = 0; i < argc; i++)
       {
         args[i].fname = argv[i];
         args[i].outName = createOutFilename_orDie(args[i].fname);
         args[i].cLevel = level;
   #if defined(ZSTD_STATIC_LINKING_ONLY)
         args[i].pool = pool;
   #endif
   
         pthread_create (&threads[i], NULL, compressFile_orDie, &args[i]);
       }
   
       for (unsigned i = 0; i < argc; i++)
         pthread_join (threads[i], NULL);
   
   #if defined(ZSTD_STATIC_LINKING_ONLY)
       ZSTD_freeThreadPool (pool);
   #endif
   
       return 0;
   }

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