[github]

Hi thanks for the great work.

With xtool0.12 I have

[External compressor:xzlib,xZLib]
header = 0
packcmd = "pre\xt12\xtool" erecomp:t75p,c128m:zlib - - <stdin> <stdout>
unpackcmd= pre\xt12\xtool drecomp:t4 - - <stdin> <stdout>

On a testing file set mostly zip and 7z files, it could precomp it well

;xzlib:
;Compressed 139 files, 822,152,142 => 1,096,061,919 bytes. Ratio 133.32%
;Compression time: cpu 0.81 sec/real 31.35 sec = 3%. Speed 26.23 mB/s

Then I could add srep+FL2 to compress it with a good ratio.

With the recent release xtool 2020 from xtool_0.3.8.7z,

with a setting of

[External compressor:xzlib2,xZLib2]
header = 0
packcmd = "pre\XTool_2020\XTool" precomp:zlib:c128m,t75p - - <stdin> <stdout>
unpackcmd= "pre\XTool_2020\XTool" decode:t4 - - <stdin> <stdout>

It will not do the similar precomp process, output is

;xzlib2
;Compressed 139 files, 822,152,142 => 822,151,338 bytes. Ratio 100.00%
;Compression time: cpu 0.53 sec/real 2.23 sec = 24%. Speed 369.24 mB/s

Do I have to adjust/add the parameter to have the similar results?

Edit:

I guess the default values for zlib might have changed. And on some aspects the new version is performing much more like a normal average setting.


For a set of .dat files 800MB, tried to compressing with arc

srep+FL2 compressed it to 414300KB, takes 32 seconds.

xtool_0.12 erecomp:t75p,c128m:zlib+srep+FL2 compressed to 412000KB takes a big 55 seconds. the zlib codec here is working very hard on something and found a little bit to more to compress further. But it added 23 seconds up on (srep+FL2)

xtool_0.12 erecomp:t75p,c128m:zstd+srep+FL2 got 414000KB takes 36 seconds, it adds 4 seconds up on (srep+FL2)

xtool_0.3.8 erecomp:t75p,c128m:zlib+srep+FL2 got to 414000KB takes 33 seconds, it adds 1 seconds up on (srep+FL2)

xtool_0.3.8 erecomp:t75p,c128m:zstd+srep+FL2 got to 414000KB takes 33 seconds , it adds 1 seconds up on (srep+FL2)