updated benchmark for v1.5.1

answers #2764

diff --git a/README.md b/README.md
index 44cce47ee0d5b1fe3e1695579773419f3df6fe58..e8117a99d6697d48094283d8308a37897a198cf0 100644 (file)
--- a/README.md
+++ b/README.md
@@ -32,8 +32,8 @@ a list of known ports and bindings is provided on [Zstandard homepage](http://ww
 ## Benchmarks
 
 For reference, several fast compression algorithms were tested and compared
-on a server running Arch Linux (`Linux version 5.5.11-arch1-1`),
-with a Core i9-9900K CPU @ 5.0GHz,
+on a desktop running Ubuntu 20.04 (`Linux 5.11.0-41-generic`),
+with a Core i7-9700K CPU @ 4.9GHz,
 using [lzbench], an open-source in-memory benchmark by @inikep
 compiled with [gcc] 9.3.0,
 on the [Silesia compression corpus].
@@ -44,25 +44,24 @@ on the [Silesia compression corpus].
 
 | Compressor name         | Ratio | Compression| Decompress.|
 | ---------------         | ------| -----------| ---------- |
-| **zstd 1.4.5 -1**       | 2.884 |   500 MB/s |  1660 MB/s |
-| zlib 1.2.11 -1          | 2.743 |    90 MB/s |   400 MB/s |
-| brotli 1.0.7 -0         | 2.703 |   400 MB/s |   450 MB/s |
-| **zstd 1.4.5 --fast=1** | 2.434 |   570 MB/s |  2200 MB/s |
-| **zstd 1.4.5 --fast=3** | 2.312 |   640 MB/s |  2300 MB/s |
-| quicklz 1.5.0 -1        | 2.238 |   560 MB/s |   710 MB/s |
-| **zstd 1.4.5 --fast=5** | 2.178 |   700 MB/s |  2420 MB/s |
-| lzo1x 2.10 -1           | 2.106 |   690 MB/s |   820 MB/s |
-| lz4 1.9.2               | 2.101 |   740 MB/s |  4530 MB/s |
-| **zstd 1.4.5 --fast=7** | 2.096 |   750 MB/s |  2480 MB/s |
-| lzf 3.6 -1              | 2.077 |   410 MB/s |   860 MB/s |
-| snappy 1.1.8            | 2.073 |   560 MB/s |  1790 MB/s |
+| **zstd 1.5.1 -1**       | 2.887 |   530 MB/s |  1700 MB/s |
+| [zlib] 1.2.11 -1        | 2.743 |    95 MB/s |   400 MB/s |
+| brotli 1.0.9 -0         | 2.702 |   395 MB/s |   450 MB/s |
+| **zstd 1.4.5 --fast=1** | 2.437 |   600 MB/s |  2150 MB/s |
+| **zstd 1.4.5 --fast=3** | 2.239 |   670 MB/s |  2250 MB/s |
+| quicklz 1.5.0 -1        | 2.238 |   540 MB/s |   760 MB/s |
+| **zstd 1.4.5 --fast=4** | 2.148 |   710 MB/s |  2300 MB/s |
+| lzo1x 2.10 -1           | 2.106 |   660 MB/s |   845 MB/s |
+| [lz4] 1.9.3             | 2.101 |   740 MB/s |  4500 MB/s |
+| lzf 3.6 -1              | 2.077 |   410 MB/s |   830 MB/s |
+| snappy 1.1.9            | 2.073 |   550 MB/s |  1750 MB/s |
 
 [zlib]: http://www.zlib.net/
-[LZ4]: http://www.lz4.org/
+[lz4]: http://www.lz4.org/
 
 The negative compression levels, specified with `--fast=#`,
-offer faster compression and decompression speed in exchange for some loss in
-compression ratio compared to level 1, as seen in the table above.
+offer faster compression and decompression speed
+at the cost of compression ratio (compared to level 1).
 
 Zstd can also offer stronger compression ratios at the cost of compression speed.
 Speed vs Compression trade-off is configurable by small increments.