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| author | Eelco Dolstra <eelco.dolstra@logicblox.com> | 2015-11-25 17:13:11 +0100 |
|---|---|---|
| committer | Eelco Dolstra <eelco.dolstra@logicblox.com> | 2015-11-25 17:13:11 +0100 |
| commit | c0d4173263a3077905643d5a044e982fc830f7ff (patch) | |
| tree | 1e7e0d4df523ab9d50389a837c2e97b66dda129a | |
| parent | efd6a8c9f63714a9d9e6020211e78de6fc5f8c11 (diff) | |
Set default binary-caches-parallel-connections to 25
Some benchmarking suggested this as a good value. Running
$ benchmark -f ... -t 25 -- sh -c 'rm -f /nix/var/nix/binary-cache*; nix-store -r /nix/store/x5z8a2yvz8h6ccmhwrwrp9igg03575jg-nixos-15.09.git.5fd87e1M.drv --dry-run --option binary-caches-parallel-connections <N>'
gave the following mean elapsed times for these values of N:
N=10: 3.3541
N=20: 2.9320
N=25: 2.6690
N=30: 2.9417
N=50: 3.2021
N=100: 3.5718
N=150: 4.2079
Memory usage is also reduced (N=150 used 186 MB, N=25 only 68 MB).
Closes #708.
| -rw-r--r-- | doc/manual/command-ref/conf-file.xml | 2 | ||||
| -rw-r--r-- | scripts/download-from-binary-cache.pl.in | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/doc/manual/command-ref/conf-file.xml b/doc/manual/command-ref/conf-file.xml index 1ad538049..daaf00ac3 100644 --- a/doc/manual/command-ref/conf-file.xml +++ b/doc/manual/command-ref/conf-file.xml @@ -426,7 +426,7 @@ flag, e.g. <literal>--option gc-keep-outputs false</literal>.</para> <listitem><para>The maximum number of parallel HTTP connections used by the binary cache substituter to get NAR info files. This number should be high to minimise latency. It defaults to - 150.</para></listitem> + 25.</para></listitem> </varlistentry> diff --git a/scripts/download-from-binary-cache.pl.in b/scripts/download-from-binary-cache.pl.in index ea053bf14..60f7f9aef 100644 --- a/scripts/download-from-binary-cache.pl.in +++ b/scripts/download-from-binary-cache.pl.in @@ -21,7 +21,7 @@ Nix::Config::readConfig; my @caches; my $gotCaches = 0; -my $maxParallelRequests = int($Nix::Config::config{"binary-caches-parallel-connections"} // 150); +my $maxParallelRequests = int($Nix::Config::config{"binary-caches-parallel-connections"} // 25); $maxParallelRequests = 1 if $maxParallelRequests < 1; my $ttlNegative = 24 * 3600; # when to purge negative lookups from the database |