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Count line of processor in /proc/cpuinfo on linux, that matches #4512

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Count line of processor in /proc/cpuinfo on linux, that matches #4512

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@sergey-dryabzhinsky sergey-dryabzhinsky commented Oct 18, 2025 •
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cpu cores even in lxc containers
Address issue #4510

@meta-cla meta-cla bot added the CLA Signed label Oct 18, 2025
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sergey-dryabzhinsky commented Oct 18, 2025 •
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Backup compression on proxmox3 server / debian7. Cpu: intel core i7 6850k 3.6 GHz, 12 cores.
W/o patch:

 time zstdmt -14 -vv -f vzdump-openvz-20001-2025_10_09-15_57_53.tar
*** Zstandard CLI (64-bit) v1.5.7, by Yann Collet ***
Note: 6 physical core(s) detected
Compressing with 6 worker threads
--zstd=wlog=22,clog=22,hlog=23,slog=5,mml=5,tlen=32,strat=6
--format=.zst --no-sparse --block-size=0 --memory=134217728 --threads=6 --content-size
Decompression will require 4194304 B of memory
vzdump-openvz-20001-2025_10_09-15_57_53.tar : 22.04%   (1803284480 B => 397499354 B, vzdump-openvz-20001-20
25_10_09-15_57_53.tar.zst)
vzdump-openvz-20001-2025_10_09-15_57_53.tar : Completed in 26.51 sec  (cpu load : 489%)
real    0m26.573s
user    2m8.388s
sys     0m1.313s

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With patch:

time zstdmt -14 -vv -f vzdump-openvz-20001-2025_10_09-15_57_53.tar
*** Zstandard CLI (64-bit) v1.5.7, by Yann Collet ***
Note: 12 physical core(s) detected
Compressing with 12 worker threads
--zstd=wlog=22,clog=22,hlog=23,slog=5,mml=5,tlen=32,strat=6
--format=.zst --no-sparse --block-size=0 --memory=134217728 --threads=12 --content-size
Decompression will require 4194304 B of memory
vzdump-openvz-20001-2025_10_09-15_57_53.tar : 22.04%   (1803284480 B => 397499354 B, vzdump-openvz-20001-2025_10_09-15_57_53.tar.zst)
vzdump-openvz-20001-2025_10_09-15_57_53.tar : Completed in 17.84 sec  (cpu load : 916%)
real    0m17.990s
user    2m42.266s
sys     0m1.353s

System load greater but process run faster.

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sergey-dryabzhinsky commented Oct 18, 2025 •
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Second server: proxmox7, debian11, cpu intel xeon E3-1230 v6 @ 3.50GHz, 8 cores.
W/o patch:

 time zstdmt -14 -vv -f vzdump-openvz-60047-2023_08_18-18_01_53.tar
*** Zstandard CLI (64-bit) v1.5.5, by Yann Collet ***
Note: 4 physical core(s) detected
--zstd=wlog=22,clog=22,hlog=23,slog=5,mml=5,tlen=32,strat=6
--format=.zst --no-sparse --block-size=0 --memory=134217728 --threads=4 --content-size
Decompression will require 4194304 B of memory
vzdump-openvz-60047-2023_08_18-18_01_53.tar : 25.32%   (580116480 B => 146903865 B, vzdump-openvz-60047-2023_08_18-18_01_53.tar.zst)
vzdump-openvz-60047-2023_08_18-18_01_53.tar : Completed in 12.85 sec  (cpu load : 375%)
real    0m12.890s
user    0m47.804s
sys     0m0.433s

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sergey-dryabzhinsky commented Oct 18, 2025 •
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With patch:

time zstdmt -14 -vv -f vzdump-openvz-60047-2023_08_18-18_01_53.tar
*** Zstandard CLI (64-bit) v1.5.7, by Yann Collet ***
Note: 8 physical core(s) detected
Compressing with 8 worker threads
--zstd=wlog=22,clog=22,hlog=23,slog=5,mml=5,tlen=32,strat=6
--format=.zst --no-sparse --block-size=0 --memory=134217728 --threads=8 --content-size
Decompression will require 4194304 B of memory
vzdump-openvz-60047-2023_08_18-18_01_53.tar : 25.01%   (580116480 B => 145070412 B, vzdump-openvz-60047-2023_08_18-18_01_53.tar.zst)
vzdump-openvz-60047-2023_08_18-18_01_53.tar : Completed in 9.25 sec  (cpu load : 673%)
real    0m9.279s
user    1m1.568s
sys     0m0.703s

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Failed action not related

@Cyan4973
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If you prefer zstdmt or -T0 to count logical cores as opposed to physical ones, there is already the --auto-threads=logical command.

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@Cyan4973 Thanx, I'll check it

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That works:

 zstdmt -vv --auto-threads=logical /dev/zero
*** Zstandard CLI (64-bit) v1.5.7, by Yann Collet ***
Note: 8 logical core(s) detected
Compressing with 8 worker threads
--zstd=wlog=21,clog=16,hlog=17,slog=1,mml=5,tlen=0,strat=2
--format=.zst --no-sparse --block-size=0 --memory=134217728 --threads=8 --content-size
zstd: /dev/zero is not a regular file -- ignored

Question: why it is not default behaviour?

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@sergey-dryabzhinsky @Cyan4973