From: Hans Kristian Rosbach <hk-git@circlestorm.org>
Date: Wed, 29 Jan 2025 15:54:36 +0000 (+0100)
Subject: Add uncompress benchmark
X-Git-Tag: 2.2.4~4
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=057104f11a07ab0a7ae4565cebe112780aa618c5;p=thirdparty%2Fzlib-ng.git

Add uncompress benchmark
---

diff --git a/test/benchmarks/CMakeLists.txt b/test/benchmarks/CMakeLists.txt
index 1e6671ff..0efed968 100644
--- a/test/benchmarks/CMakeLists.txt
+++ b/test/benchmarks/CMakeLists.txt
@@ -48,6 +48,7 @@ add_executable(benchmark_zlib
     benchmark_crc32.cc
     benchmark_main.cc
     benchmark_slidehash.cc
+    benchmark_uncompress.cc
     )
 
 target_compile_definitions(benchmark_zlib PRIVATE -DBENCHMARK_STATIC_DEFINE)
diff --git a/test/benchmarks/benchmark_uncompress.cc b/test/benchmarks/benchmark_uncompress.cc
new file mode 100644
index 00000000..58830c14
--- /dev/null
+++ b/test/benchmarks/benchmark_uncompress.cc
@@ -0,0 +1,94 @@
+/* benchmark_uncompress.cc -- benchmark uncompress()
+ * Copyright (C) 2024 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
+}
+
+#define MAX_SIZE (1024 * 1024)
+#define NUM_TESTS 6
+
+class uncompress_bench: public benchmark::Fixture {
+private:
+    size_t maxlen;
+    uint8_t *inbuff;
+    uint8_t *outbuff;
+    uint8_t *compressed_buff[NUM_TESTS];
+    uLong compressed_sizes[NUM_TESTS];
+    int64_t sizes[NUM_TESTS] = {1, 64, 1024, 16384, 128*1024, 1024*1024};
+
+public:
+    void SetUp(const ::benchmark::State& state) {
+        const char teststr[42] = "Hello hello World broken Test tast mello.";
+        maxlen = MAX_SIZE;
+
+        inbuff = (uint8_t *)zng_alloc(MAX_SIZE + 1);
+        assert(inbuff != NULL);
+
+        outbuff = (uint8_t *)zng_alloc(MAX_SIZE + 1);
+        assert(outbuff != NULL);
+
+        // Initialize input buffer
+        int pos = 0;
+        for (int32_t i = 0; i < MAX_SIZE - 42 ; i+=42){
+           pos += sprintf((char *)inbuff+pos, "%s", teststr);
+        }
+
+        // Compress data into different buffers
+        for (size_t i = 0; i < NUM_TESTS; ++i) {
+            compressed_buff[i] = (uint8_t *)zng_alloc(MAX_SIZE + 1);
+            assert(compressed_buff[i] != NULL);
+
+            uLong compressed_size = maxlen;
+            int err = PREFIX(compress)(compressed_buff[i], &compressed_size, inbuff, sizes[i]);
+            if (err != Z_OK) {
+                fprintf(stderr, "Compression failed with error %d\n", err);
+                abort();
+            }
+            compressed_sizes[i] = compressed_size;
+        }
+    }
+
+    void Bench(benchmark::State& state) {
+        int err = 0;
+
+        for (auto _ : state) {
+            int index = 0;
+            while (sizes[index] != state.range(0)) ++index;
+
+            uLong out_size = maxlen;
+            err = PREFIX(uncompress)(outbuff, &out_size, compressed_buff[index], compressed_sizes[index]);
+        }
+
+        benchmark::DoNotOptimize(err);
+    }
+
+    void TearDown(const ::benchmark::State& state) {
+        zng_free(inbuff);
+        zng_free(outbuff);
+
+        for (size_t 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);