2 ms·

> the -mt option seems to allocate core per file this can't be true in solid archive mode, which should almost always be used (otherwise you might as well use

> the -mt option seems to allocate core per file this can't be true in solid archive mode, which should almost always be used (otherwise you might as well use zip). also: $ tee {1..10} <<< 1 1 $ seq 1 1000000 > 11 $ time 7z a x.7z {1..11}; rm x.7z 7-Zip (z) 21.07 (x64) : Copyright (c) 1999-2021 Igor Pavlov : 2021-12-26 64-bit locale=en_US.UTF-8 Threads:12, ASM Scanning the drive: 11 files, 78888917 bytes (76 MiB) Creating archive: x.7z Add new data to archive: 11 files, 78888917 bytes (76 MiB) Files read from disk: 11 Archive size: 2680630 bytes (2618 KiB) Everything is Ok 7z a x.7z {1..11} 19.89s user 0.09s system 205% cpu 9.733 total $ time 7z a -mmt=1 x.7z {1..11}; rm x.7z 7-Zip (z) 21.07 (x64) : Copyright (c) 1999-2021 Igor Pavlov : 2021-12-26 64-bit locale=en_US.UTF-8 Threads:12, ASM Scanning the drive: 11 files, 78888917 bytes (76 MiB) Creating archive: x.7z Add new data to archive: 11 files, 78888917 bytes (76 MiB) Files read from disk: 11 Archive size: 2779833 bytes (2715 KiB) Everything is Ok 7z a -mmt=1 x.7z {1..11} 21.88s user 0.05s system 99% cpu 21.943 total

vetinari 5y ago
Seems that I will have to check what parameters to really use: $ time 7z a x.7z ubuntu-20.04.4-desktop-amd64.iso 7-Zip [64] 16.02 : Copyright (c) 1999-2016 Igor Pavlov : 2016-05-21 p7zip Version 16.02 (locale=en_US.UTF-8,Utf16=on,HugeFiles=on,64 bits,24 CPUs AMD Ryzen Threadripper 2920X 12-Core Processor (800F82),ASM,AES-NI) Scanning the drive: 1 file, 3379068928 bytes (3223 MiB) Creating archive: x.7z Items to compress: 1 Files read from disk: 1 Archive size: 3277419065 bytes (3126 MiB) Everything is Ok real 1m23,295s user 25m24,447s sys 0m27,991s is quite a difference compared to: $ time 7z a -t7z -m0=lzma x.7z ubuntu-20.04.4-desktop-amd64.iso 7-Zip [64] 16.02 : Copyright (c) 1999-2016 Igor Pavlov : 2016-05-21 p7zip Version 16.02 (locale=en_US.UTF-8,Utf16=on,HugeFiles=on,64 bits,24 CPUs AMD Ryzen Threadripper 2920X 12-Core Processor (800F82),ASM,AES-NI) Scanning the drive: 1 file, 3379068928 bytes (3223 MiB) Creating archive: x.7z Items to compress: 1 Files read from disk: 1 Archive size: 3305891811 bytes (3153 MiB) Everything is Ok real 7m5,647s user 13m9,589s sys 0m6,757s

vetinari 5y ago

Seems that I will have to check what parameters to really use: $ time 7z a x.7z ubuntu-20.04.4-desktop-amd64.iso 7-Zip [64] 16.02 : Copyright (c) 1999-2016 Igor Pavlov : 2016-05-21 p7zip Version 16.02 (locale=en_US.UTF-8,Utf16=on,HugeFiles=on,64 bits,24 CPUs AMD Ryzen Threadripper 2920X 12-Core Processor (800F82),ASM,AES-NI) Scanning the drive: 1 file, 3379068928 bytes (3223 MiB) Creating archive: x.7z Items to compress: 1 Files read from disk: 1 Archive size: 3277419065 bytes (3126 MiB) Everything is Ok real 1m23,295s user 25m24,447s sys 0m27,991s is quite a difference compared to: $ time 7z a -t7z -m0=lzma x.7z ubuntu-20.04.4-desktop-amd64.iso 7-Zip [64] 16.02 : Copyright (c) 1999-2016 Igor Pavlov : 2016-05-21 p7zip Version 16.02 (locale=en_US.UTF-8,Utf16=on,HugeFiles=on,64 bits,24 CPUs AMD Ryzen Threadripper 2920X 12-Core Processor (800F82),ASM,AES-NI) Scanning the drive: 1 file, 3379068928 bytes (3223 MiB) Creating archive: x.7z Items to compress: 1 Files read from disk: 1 Archive size: 3305891811 bytes (3153 MiB) Everything is Ok real 7m5,647s user 13m9,589s sys 0m6,757s