AuroraMiddleware/zstd
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Fix small README things

Browse Source
This commit is contained in:
Nick Terrell 2016-09-01 15:30:36 -07:00
parent c932520960
commit f381d2d39c
1 changed files with 6 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
contrib/pzstd/README.md
View File

@ -1,6 +1,7 @@
# Parallel Zstandard (PZstandard)
Parallel Zstandard provides Zstandard format compatible compression and decompression that is able to utilize multiple cores.
Parallel Zstandard is a Pigz-like tool for Zstandard.
It provides Zstandard format compatible compression and decompression that is able to utilize multiple cores.
It breaks the input up into equal sized chunks and compresses each chunk independently into a Zstandard frame.
It then concatenates the frames together to produce the final compressed output.
Optionally, with the `-p` option, PZstandard will write a 12 byte header for each frame that is a skippable frame in the Zstandard format, which tells PZstandard the size of the next compressed frame.
@ -31,11 +32,11 @@ Compression Speed vs Ratio with 4 Threads | Decompression Speed with 4 Threads
The test procedure was to run each of the following commands 2 times for each compression level, and take the minimum time.
time ./pzstd -# -n 4 -p -c silesia.tar > silesia.tar.zst
time ./pzstd -d -n 4 -c silesia.tar.zst > /dev/null
time pzstd -# -n 4 -p -c silesia.tar > silesia.tar.zst
time pzstd -d -n 4 -c silesia.tar.zst > /dev/null
time pigz -# -p 4 -k -c silesia.tar > silesia.tar.gz
time pigz -d -p 4 -k -c silesia.tar.gz > /dev/null
time pigz -# -p 4 -k -c silesia.tar > silesia.tar.gz
time pigz -d -p 4 -k -c silesia.tar.gz > /dev/null
PZstandard was tested using compression levels 1-19, and Pigz was tested using compression levels 1-9.
Pigz cannot do parallel decompression, it simply does each of reading, decompression, and writing on separate threads.