3 ms·

I just tested on a ramdisk: tool cspeed size dspeed zstd 361 MB/s 16% 1321 MB/s lzop 512 MB/s 29% 539 MB/s lz4 555 MB/s 29% 1190 MB/

by o11c 1y ago

I just tested on a ramdisk: tool cspeed size dspeed zstd 361 MB/s 16% 1321 MB/s lzop 512 MB/s 29% 539 MB/s lz4 555 MB/s 29% 1190 MB/s If working from files on disk that happen not to be cached, the speed differences are likely to disappear, even on many NVMe disks. (It just so happens that the concatenation of all text-looking .tar files I happen to have on this machine is roughly a gigabyte (though I did the math for the actual size)).

PhilipRoman 1y ago
Looks like it depends heavily on choice of file, but I see good performance on both compressible and uncompressible files. Small files tend to perform (relatively) bad though. Here is a sample of 3 large files with different compression ratios: zstd -b1 --fast -i10 some-rpi-os-image-idk.img -1#-os-image-idk.img :2097152000 -> 226798302 (x9.247), 6765.0 MB/s, 5897.3 MB/s zstd -b1 --fast -i10 jdk-11.0.8+10.tar -1#jdk-11.0.8+10.tar : 688844800 -> 142114709 (x4.847), 2660.7 MB/s, 2506.8 MB/s zstd -b1 --fast -i10 archlinux-2025.04.01-x86_64.iso -1#.04.01-x86_64.iso :1236303872 ->1221271223 (x1.012), 3643.5 MB/s, 7836.6 MB/s