Date: Wed, 14 Mar 2018 19:15:51 +0100
From: Steffen Nurpmeso <steffen@sdaoden.eu>
To: =?utf-8?B?Q8OhZw==?= <ca6c@bitmessage.ch>
Cc: alpine-user@lists.alpinelinux.org
Subject: Re: [alpine-user] FYI: community/zstd binary much (up to 4x)
 slower than necessary
Message-ID: <20180314181551.dESjX%steffen@sdaoden.eu>
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C=C3=A1g <ca6c@bitmessage.ch> wrote:
 |Steffen Nurpmeso wrote:
 |> Hello, for your possible interest.
 |>=20
 |> In a thead for the LUGA(ustria) i eventually had to time some
 |> compression algorithms and wondered why zstd is so slow, but
 |> especially so the decompressing stage, which a key feature of this
 |> one.  It turns out that the -Os compilation causes, well, drama-
 |> tical performance degradation.  I compiled my own with -O3 and the
 |> difference is up to factor four.  Just one example:
 |
 |What about -O2? Also what are the differences in binary sizes? Are you
 |using gcc? If yes, try clang.

I thought it could be of interest for those who have many files or
whatever.  Factor four is not nothing, especially if it is lost at
the bottommost level of computing.
In some private message i responded

  Not really comparable since it found development stuff of other
  archivers and compiled that in -- he adds more and more support
  for other archive formats and i think that will end up like tar
  a.k.a. libarchive umbrellas do.  I do not know how i could have
  an isolated quickshot or what make flags i would have to use to
  get a stripped version that is comparable.  (Too lazy, too late.)

  But sure it will be somewhat larger, -Os is like -O2 (?) with some
  reduction -- then again this is not chromium or something but
  a (per se) small archiver, and factor four on decompression side
  is drastical.  It may also be platform dependent.  I mean, for my
  use case that is all right (but now that i have the binary around
  it stays for a while), but if it would drive a compressed file
  system or if i had a lot of compressed files to deal with
  regulary, or if i had a server with database or whatever and it
  would base on such files, then it would matter.  (That is why
  i said FYI.)

--steffen
|
|Der Kragenbaer,                The moon bear,
|der holt sich munter           he cheerfully and one by one
|einen nach dem anderen runter  wa.ks himself off
|(By Robert Gernhardt)


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