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Add more benchmarks.

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Con Kolivas 2012-07-07 23:59:26 +10:00
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doc/README.benchmarks
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@ -126,6 +126,23 @@ which works the memory subsystem rather hard making noticeable impact on the
rest of the machine also does further wonders for the compression (virtually
always) and even the times in this particular case.
Finally testing the same 10GB image on a i7-3930K at 3.2GHz (12 thread CPU!)
with 32GB of ram so the whole image fits in ram with a fast SSD:
Compression Size Percentage Compress Time Decompress Time
None 10737418240 100.0
gzip 2772899756 25.8 3m56s 2m15s
pbzip2 2705814394 25.2 1m41s 1m46s
lrzip 1095337763 10.2 2m54s 2m21s
Note that with enough ram and CPU, lrzip is actually faster than gzip (which
does compression in place) and comparable on decompression, despite a huge
increase in compression. pbzip2 is faster than both but its compression is
almost no better than gzip.
This should help govern what compression you choose. Small files are nicely
compressed with zpaq. Intermediate files are nicely compressed with lzma.
Large files get excellent results even with lzo provided you have enough ram.
@ -134,4 +151,4 @@ Or, to make things easier, just use the default settings all the time and be
happy as lzma gives good results. :D
Con Kolivas
Fri, 17 Mar 2011
Saturday, 7th July 2012