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Use pixz instead of bzip2 for compressing nars

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According to following two benchmarks:

- https://www.rootusers.com/gzip-vs-bzip2-vs-xz-performance-comparison/
- http://catchchallenger.first-world.info/wiki/Quick_Benchmark:_Gzip_vs_Bzip2_vs_LZMA_vs_XZ_vs_LZ4_vs_LZO

xz has better compression ratio than bzip2 at lowest compression rate.

https://github.com/vasi/pixz has been chosen as it can scale compressing
over multiple cores linearly.

We're using this in snabblab for a month now and it has improved CPU
wise the main Hydra server.
This commit is contained in:
Domen Kožar 2016-08-12 11:39:07 +02:00
parent dd32033657
commit 23bf99b8e2
4 changed files with 7 additions and 4 deletions
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1
hydra-module.nix
View file

@ -225,6 +225,7 @@ in
base_uri ${cfg.hydraURL} base_uri ${cfg.hydraURL}
notification_sender ${cfg.notificationSender} notification_sender ${cfg.notificationSender}
max_servers 25 max_servers 25
compress_num_threads 0
${optionalString (cfg.logo != null) '' ${optionalString (cfg.logo != null) ''
hydra_logo ${cfg.logo} hydra_logo ${cfg.logo}
''} ''}

2
release.nix
View file

@ -134,7 +134,7 @@ rec {
]; ];
hydraPath = lib.makeBinPath ( hydraPath = lib.makeBinPath (
[ libxslt sqlite subversion openssh nix coreutils findutils [ libxslt sqlite subversion openssh nix coreutils findutils pixz
gzip bzip2 lzma gnutar unzip git gitAndTools.topGit mercurial darcs gnused bazaar gzip bzip2 lzma gnutar unzip git gitAndTools.topGit mercurial darcs gnused bazaar
] ++ lib.optionals stdenv.isLinux [ rpm dpkg cdrkit ] ); ] ++ lib.optionals stdenv.isLinux [ rpm dpkg cdrkit ] );

2
src/lib/Hydra/View/NARInfo.pm
View file

@ -21,7 +21,7 @@ sub process {
my $info; my $info;
$info .= "StorePath: $storePath\n"; $info .= "StorePath: $storePath\n";
$info .= "URL: nar/" . basename $storePath. "\n"; $info .= "URL: nar/" . basename $storePath. "\n";
$info .= "Compression: bzip2\n"; $info .= "Compression: xz\n";
$info .= "NarHash: $narHash\n"; $info .= "NarHash: $narHash\n";
$info .= "NarSize: $narSize\n"; $info .= "NarSize: $narSize\n";
$info .= "References: " . join(" ", map { basename $_ } @{$refs}) . "\n"; $info .= "References: " . join(" ", map { basename $_ } @{$refs}) . "\n";

4
src/lib/Hydra/View/NixNAR.pm
View file

@ -8,12 +8,14 @@ sub process {
my ($self, $c) = @_; my ($self, $c) = @_;
my $storePath = $c->stash->{storePath}; my $storePath = $c->stash->{storePath};
my $numThreads = $c->config->{'compress_num_threads'};
my $pParam = ($numThreads > 0) ? "-p$numThreads" : "";
$c->response->content_type('application/x-nix-archive'); # !!! check MIME type $c->response->content_type('application/x-nix-archive'); # !!! check MIME type
my $fh = new IO::Handle; my $fh = new IO::Handle;
open $fh, "nix-store --dump '$storePath' | bzip2 |"; open $fh, "nix-store --dump '$storePath' | pixz -0 $pParam |";
setCacheHeaders($c, 365 * 24 * 60 * 60); setCacheHeaders($c, 365 * 24 * 60 * 60);