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Hi Igor, We know the maximum compression is using LZMA format with 2 threads. Is it possible, we still use LZMA format, but use more than 2 threads to explore the best compression options ? For example, Thread 1, control thread Thread 2, try compress option 1 Thread 3, try compress option 2 ... Thread N, try compress option n-1, Thread 1, monitors all other threads and take the best one for a trunk and write it to disk. and then thread 2 -N tried to find best options for next trunk... Regards,

Hi @ipavlov, XZ Utils 5.8.0 is out. Can 7zip take the following advantage? :) liblzma on 32/64-bit x86: When possible, use SSE2 intrinsics instead of memcpy() in the LZMA/LZMA2 decoder. In typical cases, this may reduce decompression time by 0-5 %. However, when built against musl libc, over 15 % time reduction was observed with highly compressed files.

for the -xtd option, maybe we should add a warning in the help text that empty folders will be excluded from the archive. I have a scenario with this switch on/off: 42/34 folders

for the -xtd option, maybe we should add a warning in the help text that empty folder will be excluded from the archive. I have a scenario with this switch on/off: 42/34 folders

7z.sfx AND 7zCon.sfx are still x86 version in 7z2301-x64.exe. Should we replace them with 64-bit versions or keep them to x86 version for a reason?

Thank you very much!!! Lots to learn. :)

Thanks a lot. Now the packed size is same, but my headers size (17164/17180) is always bigger than yours (16806), any clue here? LOL. Size: 9 123 132 Packed Size: 1 349 001 Folders: 57 Files: 1 256 CRC: 6D932FDC ------------------------: Path: E:\Downloads\Compress\7z2301-src\test.7z Type: 7z Physical Size: 1 366 165 Headers Size: 17 164 Method: LZMA:9m Solid: + Blocks: 1

Hi Igor, A curious question. What were the parameters you compressed the source code, 7z2301-src.7z I unzipped and zipped again, the archive size is always bigger. Please refer following Packed Size and Header size. I even used parameters like these: -mmt=2 -mx=9 -mfb=273 -md=768m Your file Packed Size: 1 349 001 Folders: 57 Files: 1 256 CRC: 6D932FDC ------------------------: Path: E:\Downloads\Compress\7z2301-src.org.7z Type: 7z Physical Size: 1 365 807 Headers Size: 16 806 Method: LZMA:9m Solid:...