How to write a 'tar' command - eviltoast
  • Eager Eagle@lemmy.worldEnglish
    4·
    1 year ago

    as in time wasted transferring a highly compressible file that you didn’t bother compressing first?

    it’s only a waste of time when the file format is already compressed.

    • PuppyOSAndCoffee@lemmy.ml
      12·
      1 year ago

      Unless you measure your baud in dial up modem, it often can take longer to compress / transport / uncompress than just transfer directly.

      • Eager Eagle@lemmy.worldEnglish
        4·
        1 year ago

        unless you’re picking a slow compressor that’s not true at all

        Original size | 100 GB
Compressed size | 47.8 GB (2.091 ratio)
Transfer speed | 1 Gbps (125 MB/s)
Original transfer time | 100 GB / 125 MB/s = 800 seconds
Compressed transfer time | 47.8 GB / 125 MB/s = 382.4 seconds

Compressor | Snappy
Compression ratio | 2.091 ratio
Compression speed | 565 MB/s
Decompression speed | 1950 MB/s
Compression time | 100 GB / 565 MB/s = 177 seconds
Decompression time | 47.8 GB / 1950 MB/s = 24.5 seconds

Transfer time w/o compression | 800 seconds
Transfer time with compression | 177 + 382.4 + 24.5 = 584.9 seconds