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authorZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2014-07-05 14:29:56 -0400
committerZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2014-07-06 19:06:03 -0400
commitfd53fee04b1f1c1ca1e30e8d470d7416900a35dc (patch)
treeb794e2af0010e8cf88d1a4fa3ff81f6ef7f6bd7c /src/journal
parentd89c8fdf48c7bad5816b9f2e77e8361721f22517 (diff)
compress: add benchmark-style test
This is useful to test the behaviour of the compressor for various buffer sizes. Time is limited to a minute per compression, since otherwise, when LZ4 takes more than a second which is necessary to reduce the noise, XZ takes more than 10 minutes. % build/test-compress-benchmark (without time limit) XZ: compressed & decompressed 2535300963 bytes in 794.57s (3.04MiB/s), mean compresion 99.95%, skipped 3570 bytes LZ4: compressed & decompressed 2535303543 bytes in 1.56s (1550.07MiB/s), mean compresion 99.60%, skipped 990 bytes % build/test-compress-benchmark (with time limit) XZ: compressed & decompressed 174321481 bytes in 60.02s (2.77MiB/s), mean compresion 99.76%, skipped 3570 bytes LZ4: compressed & decompressed 2535303543 bytes in 1.63s (1480.83MiB/s), mean compresion 99.60%, skipped 990 bytes It appears that there's a bug in lzma_end where it leaks 32 bytes.
Diffstat (limited to 'src/journal')
-rw-r--r--src/journal/test-compress-benchmark.c113
1 files changed, 113 insertions, 0 deletions
diff --git a/src/journal/test-compress-benchmark.c b/src/journal/test-compress-benchmark.c
new file mode 100644
index 0000000000..0a23bd1e13
--- /dev/null
+++ b/src/journal/test-compress-benchmark.c
@@ -0,0 +1,113 @@
+/***
+ This file is part of systemd
+
+ Copyright 2014 Zbigniew Jędrzejewski-Szmek
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include "compress.h"
+#include "util.h"
+#include "macro.h"
+
+typedef int (compress_t)(const void *src, uint64_t src_size, void *dst, uint64_t *dst_size);
+typedef int (decompress_t)(const void *src, uint64_t src_size,
+ void **dst, uint64_t *dst_alloc_size, uint64_t* dst_size, uint64_t dst_max);
+
+#define MAX_SIZE (1024*1024LU)
+
+static char* make_buf(size_t count) {
+ char *buf;
+ size_t i;
+
+ buf = malloc(count);
+ assert(buf);
+
+ for (i = 0; i < count; i++)
+ buf[i] = 'a' + i % ('z' - 'a' + 1);
+
+ return buf;
+}
+
+static void test_compress_decompress(const char* label,
+ compress_t compress, decompress_t decompress) {
+ usec_t n, n2;
+ float dt;
+
+ _cleanup_free_ char *text, *buf;
+ _cleanup_free_ void *buf2 = NULL;
+ size_t buf2_allocated = 0;
+ size_t skipped = 0, compressed = 0, total = 0;
+
+ text = make_buf(MAX_SIZE);
+ buf = calloc(MAX_SIZE + 1, 1);
+ assert(text && buf);
+
+ n = now(CLOCK_MONOTONIC);
+
+ for (size_t i = 1; i <= MAX_SIZE; i += (i < 2048 ? 1 : 217)) {
+ size_t j = 0, k = 0;
+ int r;
+
+ r = compress(text, i, buf, &j);
+ /* assume compresion must be succesful except for small inputs */
+ assert(r == 0 || (i < 2048 && r == -ENOBUFS));
+ /* check for overwrites */
+ assert(buf[i] == 0);
+ if (r != 0) {
+ skipped += i;
+ continue;
+ }
+
+ assert(j > 0);
+ if (j >= i)
+ log_error("%s \"compressed\" %zu -> %zu", label, i, j);
+
+ r = decompress(buf, j, &buf2, &buf2_allocated, &k, 0);
+ assert(r == 0);
+ assert(buf2_allocated >= k);
+ assert(k == i);
+
+ assert(memcmp(text, buf2, i) == 0);
+
+ total += i;
+ compressed += j;
+
+ n2 = now(CLOCK_MONOTONIC);
+ if (n2 - n > 60 * USEC_PER_SEC)
+ break;
+ }
+
+ dt = (n2-n) / 1e6;
+
+ log_info("%s: compressed & decompressed %zu bytes in %.2fs (%.2fMiB/s), "
+ "mean compresion %.2f%%, skipped %zu bytes",
+ label, total, dt,
+ total / 1024. / 1024 / dt,
+ 100 - compressed * 100. / total,
+ skipped);
+}
+
+int main(int argc, char *argv[]) {
+
+ log_set_max_level(LOG_DEBUG);
+
+#ifdef HAVE_XZ
+ test_compress_decompress("XZ", compress_blob_xz, decompress_blob_xz);
+#endif
+#ifdef HAVE_LZ4
+ test_compress_decompress("LZ4", compress_blob_lz4, decompress_blob_lz4);
+#endif
+ return 0;
+}