[BUG] Keka zstd use only one core

[ilya-kudravets]

Configuration

• Keka version: [e.g. 1.2.11 (4493)]
• macOS version: [e.g. 10.15.7 (19H524)]

Describe the bug

Keka use only one cpu core
If your use console zstd with -T0 -4 argument, we see very fast compression.

2021-03-05 14:59:51.367 DEV: Path set as unavailable: /Users/ilya/VirtualBoxVMs.tar.zst
2021-03-05 14:59:51.369 DEV: Checking tasks queue
2021-03-05 14:59:51.395 DEV: Starting queued task
2021-03-05 14:59:51.396 DEV: OS: Версия 10.15.7 (Выпуск 19H524)
2021-03-05 14:59:51.396 DEV: Keka: v1.2.11-r4493 (WEB) (Sandboxed) (ru)
2021-03-05 14:59:51.396 DEV: Binary used: kekazstd
2021-03-05 14:59:51.396 DEV: Arguments: (
    "-4",
    "-T0",
    "-o",
    "/Users/ilya/VirtualBoxVMs.tar.zst",
    "/Users/ilya/VirtualBoxVMs.tar"
)
2021-03-05 14:59:51.420 READER: 
Read : 0 / 88615 MB ==> 33% 
2021-03-05 14:59:51.587 READER: 
Read : 25 / 88615 MB ==> 41% 
2021-03-05 14:59:51.754 READER: 
Read : 54 / 88615 MB ==> 64% 
2021-03-05 14:59:51.871 DEV: Showing delayed tasks
2021-03-05 14:59:51.921 READER: 
Read : 95 / 88615 MB ==> 77% 
2021-03-05 14:59:52.087 READER: 
Read : 133 / 88615 MB ==> 62% 
2021-03-05 14:59:52.254 READER: 
Read : 167 / 88615 MB ==> 55% 
2021-03-05 14:59:52.422 READER: 
Read : 192 / 88615 MB ==> 51% 
2021-03-05 14:59:52.589 READER: 
Read : 219 / 88615 MB ==> 48% 
2021-03-05 14:59:52.756 READER: 
Read : 246 / 88615 MB ==> 45% 
2021-03-05 14:59:52.922 READER: 
Read : 271 / 88615 MB ==> 43% 
2021-03-05 14:59:53.089 READER: 
Read : 293 / 88615 MB ==> 42% 
2021-03-05 14:59:53.256 READER: 
Read : 320 / 88615 MB ==> 40% 
2021-03-05 14:59:53.424 READER: 
Read : 355 / 88615 MB ==> 39% 
2021-03-05 14:59:53.591 READER: 
Read : 394 / 88615 MB ==> 36% 
2021-03-05 14:59:53.758 READER: 
Read : 416 / 88615 MB ==> 36% 
2021-03-05 14:59:53.925 READER: 
Read : 444 / 88615 MB ==> 36% 
2021-03-05 14:59:54.094 READER: 
Read : 463 / 88615 MB ==> 36% 
2021-03-05 14:59:54.260 READER: 
Read : 484 / 88615 MB ==> 36% 
2021-03-05 14:59:54.427 READER: 
Read : 509 / 88615 MB ==> 35% 
2021-03-05 14:59:54.594 READER: 
Read : 527 / 88615 MB ==> 35% 
2021-03-05 14:59:54.761 READER: 
Read : 551 / 88615 MB ==> 35% 
2021-03-05 14:59:54.928 READER: 
Read : 633 / 88615 MB ==> 31% 
2021-03-05 14:59:55.095 READER: 
Read : 771 / 88615 MB ==> 26% 
2021-03-05 14:59:55.262 READER: 
Read : 809 / 88615 MB ==> 26% 
2021-03-05 14:59:55.430 READER: 

To Reproduce

Steps to reproduce the behavior:
1.Open keka
2.Create zstd archive

Expected behavior

Very fast compression with multicore

Screenshots

[aonez]

Thanks a lot @ilya-kudravets! Seems multithreading was disabled in ZSTD. Not sure why it was not detected before.

[aonez]

1.2.12 released with ZSTD multithread support 🔥