Quote:
Originally Posted by infovs
Thank you Razor12911 for your incredible work! Two short questions if it is not too much trouble...how to use undocumented option introduced in 0.70?
- added optimize option to speed up the decoding process for zstd and oodle codecs
Looking at source it is used by adding parameter -o ...but not sure where, at decoding or encoding... I tried used it at both places, precomp some oodle data -> decoding speed was exactly the same as before without -o parameter :\
Also, is there any chance or parameter that can make xtool use and utilize srep64.exe instead of renamed srep.exe?
Thanks in advance, again, big thanks for everything!
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Hi, optimise was added but not documented simply because the conditions needed for the benefits to even be noticeable are obscure, essentially the game Returnal was the reason this feature was added. The game used leviathan which takes a long time to process, to put it into perspective, if a stream was compressed using level 9 and let's say it takes 20 seconds to process, what optimise does is try lesser compression settings that give the same output, like level 8 which takes half the time on average compared to level 9 so that's about 10 seconds, 50% gain in speed, it does this again and again until the compression setting no longer gives the same output. As a result, some level 9 compressed streams of Returnal could be compressed with level 6, some level 7.
With this in mind, the installation should be faster right? Well yes it is but I wasn't impressed by the improvements so I left it undocumented.
Benchmark on pakchunk2_s8-WindowsNoEditor.pak of Returnal
without -o
Code:
XTool is created by Razor12911
Time: 00:22:17 (CPU 02:12:41)
with -o
Code:
XTool is created by Razor12911
Time: 00:18:50 (CPU 01:52:02)
We got about 15% speed improvement. You might see this as a win, but precompression took 32 mins with -o than 23 mins without -o so 40% more time for precompression.
As for srep/srep64, just let 32-bit programs die.
