From: "Nicolò Balzarotti" <anothersms@gmail.com>
To: Pierre Neidhardt <mail@ambrevar.xyz>,
Guillaume Le Vaillant <glv@posteo.net>
Cc: guix-devel@gnu.org
Subject: Re: When substitute download + decompression is CPU-bound
Date: Fri, 29 Jan 2021 15:55:49 +0100 [thread overview]
Message-ID: <87bld7bxmy.fsf@guixSD.i-did-not-set--mail-host-address--so-tickle-me> (raw)
In-Reply-To: <87lfccrley.fsf@ambrevar.xyz>
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Pierre Neidhardt <mail@ambrevar.xyz> writes:
> Nicolò Balzarotti <anothersms@gmail.com> writes:
>
> What wouldn't be the case? If you mean that "gzip is never the best
> choice", wouldn't Zstd outperform gzip on the Raspberry Pi 1 too?
My bad, you are right. Also, memory usage shoudn't be a problem. gzip
uses way less (testd on ungoogled chromium, I get ~16kb peak heap size
for gzip, 8Mb for zstd and 32Mb for lzip), but I'd expect guix to be
running on systems with more than 8Mb of memory. Just for reference,
here's the memory profiling script
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#+PROPERTY: header-args:bash :session valgrind
* NAR Decompression memory benchmark
#+begin_src bash :results none
guix environment --ad-hoc valgrind lzip gzip zstd wget
#+end_src
#+begin_src bash :cache yes
valgrind --version | sed 's/-/ /'
lzip --version | head -1
gunzip --version | head -1 | sed 's/\s(/(/'
zstd --version | sed -e 's/command.*v//' -e 's/,.*//' -e 's/**//'
#+end_src
#+RESULTS[e07cecfd5cc770b7a898408b80678f2e8ea7772e]:
| valgrind | 3.16.1 |
| lzip | 1.21 |
| gunzip(gzip) | 1.1 |
| zstd | 1.4.4 |
Just noticed that there should be a new zstd release ([[https://github.com/facebook/zstd/releases/][zstd 1.4.8]]), and
a new lzip release ([[https://download.savannah.gnu.org/releases/lzip/][lzip 1.22]]).
** Prepare required data
#+begin_src bash :cache yes
wget https://ci.guix.gnu.org/nar/gzip/kfcrrl6p6f6v51jg5rirmq3q067zxih6-ungoogled-chromium-87.0.4280.88-0.b78cb92 -O uc.nar.gz
wget https://ci.guix.gnu.org/nar/lzip/kfcrrl6p6f6v51jg5rirmq3q067zxih6-ungoogled-chromium-87.0.4280.88-0.b78cb92 -O uc.nar.lz
#+end_src
#+RESULTS[ea17e5a54da1ca54a9c82f264912675d9ca981a0]:
Create zstd compressed file
#+begin_src bash :results none
gunzip -c < uc.nar.gz > uc.nar
zstd -19 uc.nar -o uc.nar.zstd
#+end_src
Check file sizes
#+begin_src bash
ls -lh --sort=size | head -5
#+end_src
#+RESULTS:
| total | 585M | | | | | | | |
| -rw-r--r-- | 1 | nixo | users | 335M | Jan | 29 | 15:14 | uc.nar |
| -rw-r--r-- | 1 | nixo | users | 103M | Jan | 29 | 15:13 | uc.nar.gz |
| -rw-r--r-- | 1 | nixo | users | 78M | Jan | 29 | 15:14 | uc.nar.zstd |
| -rw-r--r-- | 1 | nixo | users | 71M | Jan | 29 | 15:13 | uc.nar.lz |
** Decompress
#+name: massif
#+begin_src bash :session valgrind :var command="ls" input="." output="/dev/null" name="ls"
time valgrind --tool=massif --log-file=/dev/null --time-unit=B --trace-children=yes --massif-out-file=$name.massif $command < $input >$output
#+end_src
#+call: massif(command="gunzip -c", input="uc.nar.gz", output="/dev/null", name="gzip")
#+RESULTS:
| nixo@guixSD | ~/prof | [env]$ | nixo@guixSD | ~/prof | [env]$ | nixo@guixSD | ~/prof | [env]$ |
| real | 0m8.291s | | | | | | | |
| user | 0m7.910s | | | | | | | |
| sys | 0m0.201s | | | | | | | |
#+call: massif(command="lzip -d", input="uc.nar.lz", output="/dev/null", name="lzip")
#+RESULTS:
| nixo@guixSD | ~/prof | [env]$ | nixo@guixSD | ~/prof | [env]$ | nixo@guixSD | ~/prof | [env]$ |
| real | 0m22.378s | | | | | | | |
| user | 0m20.959s | | | | | | | |
| sys | 0m0.345s | | | | | | | |
#+call: massif(command="zstd -d", input="uc.nar.zstd", output="/dev/null", name="zstd")
#+RESULTS:
| nixo@guixSD | ~/prof | [env]$ | nixo@guixSD | ~/prof | [env]$ | nixo@guixSD | ~/prof | [env]$ |
| real | 0m4.607s | | | | | | | |
| user | 0m4.157s | | | | | | | |
| sys | 0m0.135s | | | | | | | |
** Check massif output
#+begin_src bash :results raw drawer
for ext in gzip lzip zstd; do
ms_print $ext.massif > $ext.graph
done
#+end_src
#+RESULTS:
:results:
:end:
--------------------------------------------------------------------------------
Command: /gnu/store/378zjf2kgajcfd7mfr98jn5xyc5wa3qv-gzip-1.10/bin/gzip -d -c
Massif arguments: --time-unit=B --massif-out-file=gzip.massif
ms_print arguments: gzip.massif
--------------------------------------------------------------------------------
KB
15.59^ #
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| # :
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| : # :: : :
| : # :: : : :
| : :#: ::::: :: : :: : : : : : @@ :
| : :#: :: : :: : : : : : : : @ :
| : :#: :: : :: : : : : : : : @ :
| : :#: :: : :: : : : : : : : : @ :
| : :#: :: : :: : : : : : : : : @ :
| : :#: :: : ::: ::: :::: : : : :: : @ : :
| : :#: :: : ::: ::: :: :: : : : :::: :::: : @ : :
| : :#::::: : ::: ::: : :: : ::: : ::: : ::: :::@@ : @ ::: :
| : :#:: :: : :::::::: : :: : :: :: ::: : ::: :: @ :::@ :: :
| ::::#:: :: : :::: ::: : :: : :: :: ::: : ::: :: @ :::@ :: : :
0 +----------------------------------------------------------------------->MB
0 114.8
Number of snapshots: 53
Detailed snapshots: [5 (peak), 21, 39, 42, 46, 50]
--------------------------------------------------------------------------------
Command: lzip -d
Massif arguments: --time-unit=B --massif-out-file=lzip.massif
ms_print arguments: lzip.massif
--------------------------------------------------------------------------------
MB
32.09^ ###################################
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0 +----------------------------------------------------------------------->MB
0 64.18
Number of snapshots: 12
Detailed snapshots: [6 (peak)]
--------------------------------------------------------------------------------
Command: zstd -d
Massif arguments: --time-unit=B --massif-out-file=zstd.massif
ms_print arguments: zstd.massif
--------------------------------------------------------------------------------
MB
8.665^ #
| :#:::::::::::::::::::::::::::::::::
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0 +----------------------------------------------------------------------->MB
0 17.33
Number of snapshots: 18
Detailed snapshots: [9 (peak)]
next prev parent reply other threads:[~2021-01-29 14:56 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-14 22:20 When substitute download + decompression is CPU-bound Ludovic Courtès
2020-12-14 22:29 ` Julien Lepiller
2020-12-14 22:59 ` Nicolò Balzarotti
2020-12-15 7:52 ` Pierre Neidhardt
2020-12-15 9:45 ` Nicolò Balzarotti
2020-12-15 9:54 ` Pierre Neidhardt
2020-12-15 10:03 ` Nicolò Balzarotti
2020-12-15 10:13 ` Pierre Neidhardt
2020-12-15 10:14 ` Pierre Neidhardt
2020-12-15 11:42 ` Ludovic Courtès
2020-12-15 12:31 ` Pierre Neidhardt
2020-12-18 14:59 ` Ludovic Courtès
2020-12-18 15:33 ` Pierre Neidhardt
2020-12-15 11:36 ` Ludovic Courtès
2020-12-15 11:45 ` Nicolò Balzarotti
2020-12-15 10:40 ` Jonathan Brielmaier
2020-12-15 19:43 ` Joshua Branson
2021-01-07 10:45 ` Guillaume Le Vaillant
2021-01-07 11:00 ` Pierre Neidhardt
2021-01-07 11:33 ` Guillaume Le Vaillant
2021-01-14 21:51 ` Ludovic Courtès
2021-01-14 22:08 ` Nicolò Balzarotti
2021-01-28 17:53 ` Are gzip-compressed substitutes still used? Ludovic Courtès
2021-03-17 17:12 ` Ludovic Courtès
2021-03-17 17:33 ` Léo Le Bouter
2021-03-17 18:08 ` Vagrant Cascadian
2021-03-18 0:03 ` zimoun
2021-03-18 16:00 ` Vagrant Cascadian
2021-03-18 18:53 ` Leo Famulari
2021-03-20 11:23 ` Ludovic Courtès
2021-03-17 18:06 ` zimoun
2021-03-17 18:20 ` Jonathan Brielmaier
2021-03-18 17:25 ` Pierre Neidhardt
2021-01-15 8:10 ` When substitute download + decompression is CPU-bound Pierre Neidhardt
2021-01-28 17:58 ` Ludovic Courtès
2021-01-29 9:45 ` Pierre Neidhardt
2021-01-29 11:23 ` Guillaume Le Vaillant
2021-01-29 11:55 ` Nicolò Balzarotti
2021-01-29 12:13 ` Pierre Neidhardt
2021-01-29 13:06 ` Guillaume Le Vaillant
2021-01-29 14:55 ` Nicolò Balzarotti [this message]
2021-02-01 22:18 ` Ludovic Courtès
2021-01-29 13:33 ` zimoun
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