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    compman

    @compman

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    Latest posts made by compman

    • RE: It takes longer Time (More Than 5 Minutes) Erasing current MBR/GPT tables.

      zstd would be even better if it was possible to use its new --long option, which can be associated with level -19 and multithreading for amazing compression ratio and speed, without the known issue of too large memory usage from --ultra modes (levels 20+). Downside: it requires a fairly recent version of zstd (v1.3.4+).

      posted in FOG Problems
      C
      compman
    • RE: Hardware upgrades for server

      @george1421 zstd decompression speed is supposed to stay more or less the same whatever the compression level. Only compression becomes slower.

      posted in General
      C
      compman
    • RE: Capture failure since 1.3.5

      Could this be an IO error beyond 2 GB ?
      That used to happen on older 32-bits systems, and is still something to care about with minGW.
      I would not expect that from Ubuntu x64, but that conclusion may depend on the compiler used.

      posted in FOG Problems
      C
      compman
    • RE: ZSTD Compression

      @Junkhacker “ultra” compression ratio (>=20) use a lot of memory.
      So, either stick to “normal” compression levels (<= 19), or limit the number of threads, to ensure it doesn’t consume too much memory.

      posted in Feature Request
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      compman
    • RE: ZSTD Compression

      @Tom-Elliott this is really unexpected. zstd tends to save a ton of time compared to gzip, on top of a better compression ratio, especially on large files (and anything > 100 MB certainly qualifies).

      Except for cases where compression time doesn’t matter, zstd good use range seems to be levels 1 - 8. Default is 3, though I tend to prefer level 5 for my own use. It always compresses better than default gzip 6.

      Your test image may contains large uncompressible sections (such as already-compressed files in the image, that no algorithm can compress further). This is typical of a freshly installed Windows OS. But is it representative of fog images ?

      posted in Feature Request
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      compman
    • RE: ZSTD Compression

      Note that, since v1.1.3, there is a multithread mode available with zstd.

      It needs to be compiled with specific flags though.
      On linux, it means typing make zstdmt
      For Windows, there are pre-compiled binaries in the release section : use the zstdmt one.

      Since pigz is multi-threaded, it would be more fair to compare to zstdmt, rather than single-threaded zstd.

      The number of threads can be selected with command -T#, like xz.

      posted in Feature Request
      C
      compman