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/* benchmark_uncompress.cc -- benchmark uncompress()
* Copyright (C) 2024-2025 Hans Kristian Rosbach
* For conditions of distribution and use, see copyright notice in zlib.h
*/
#include <stdio.h>
#include <assert.h>
#include <benchmark/benchmark.h>
extern "C" {
# include "zbuild.h"
# include "zutil_p.h"
# if defined(ZLIB_COMPAT)
# include "zlib.h"
# else
# include "zlib-ng.h"
# endif
# include "test/compressible_data_p.h"
}
#define MAX_SIZE (1024 * 1024)
#define NUM_TESTS 6
class uncompress_bench: public benchmark::Fixture {
private:
uint8_t *inbuff;
uint8_t *outbuff;
uint8_t *compressed_buff[NUM_TESTS];
z_uintmax_t compressed_sizes[NUM_TESTS];
uint32_t sizes[NUM_TESTS] = {1, 64, 1024, 16384, 128*1024, 1024*1024};
public:
void SetUp(::benchmark::State& state) {
outbuff = (uint8_t *)malloc(MAX_SIZE + 16);
if (outbuff == NULL) {
state.SkipWithError("malloc failed");
return;
}
// Initialize input buffer with highly compressible data, interspersed
// with small amounts of random data and 3-byte matches.
inbuff = gen_compressible_data(MAX_SIZE);
if (inbuff == NULL) {
free(outbuff);
outbuff = NULL;
state.SkipWithError("gen_compressible_data() failed");
return;
}
// Compress data into different buffers
for (int i = 0; i < NUM_TESTS; ++i) {
compressed_buff[i] = (uint8_t *)zng_alloc(sizes[i] + 64);
assert(compressed_buff[i] != NULL);
z_uintmax_t compressed_size = sizes[i] + 64;
int err = PREFIX(compress2)(compressed_buff[i], &compressed_size, inbuff, sizes[i], Z_BEST_COMPRESSION);
if (err != Z_OK) {
fprintf(stderr, "compress() failed with error %d\n", err);
abort();
}
compressed_sizes[i] = compressed_size;
}
}
void Bench(benchmark::State& state) {
int err;
for (auto _ : state) {
int index = 0;
while (sizes[index] != (uint32_t)state.range(0)) ++index;
z_uintmax_t out_size = MAX_SIZE;
err = PREFIX(uncompress)(outbuff, &out_size, compressed_buff[index], compressed_sizes[index]);
if (err != Z_OK) {
fprintf(stderr, "uncompress() failed with error %d\n", err);
abort();
}
}
}
void TearDown(const ::benchmark::State&) {
free(inbuff);
free(outbuff);
for (int i = 0; i < NUM_TESTS; ++i) {
zng_free(compressed_buff[i]);
}
}
};
#define BENCHMARK_UNCOMPRESS(name) \
BENCHMARK_DEFINE_F(uncompress_bench, name)(benchmark::State& state) { \
Bench(state); \
} \
BENCHMARK_REGISTER_F(uncompress_bench, name)->Arg(1)->Arg(64)->Arg(1024)->Arg(16<<10)->Arg(128<<10)->Arg(1024<<10);
BENCHMARK_UNCOMPRESS(uncompress_bench);
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