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nixos/hercules-ci-agent: Set default concurrency to auto

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Robert Hensing 2021-05-04 16:28:31 +02:00
parent a1b341da7e
commit 4abd56732e
1 changed files with 10 additions and 3 deletions
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nixos/modules/services/continuous-integration/hercules-ci-agent/common.nix
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@ -37,15 +37,22 @@ let
description = '' description = ''
Number of tasks to perform simultaneously. Number of tasks to perform simultaneously.
A task is a single derivation build or an evaluation. A task is a single derivation build, an evaluation or an effect run.
At minimum, you need 2 concurrent tasks for <literal>x86_64-linux</literal> At minimum, you need 2 concurrent tasks for <literal>x86_64-linux</literal>
in your cluster, to allow for import from derivation. in your cluster, to allow for import from derivation.
<literal>concurrentTasks</literal> can be around the CPU core count or lower if memory is <literal>concurrentTasks</literal> can be around the CPU core count or lower if memory is
the bottleneck. the bottleneck.
The optimal value depends on the resource consumption characteristics of your workload,
including memory usage and in-task parallelism. This is typically determined empirically.
When scaling, it is generally better to have a double-size machine than two machines,
because each split of resources causes inefficiencies; particularly with regards
to build latency because of extra downloads.
''; '';
type = types.int; type = types.either types.ints.positive (types.enum [ "auto" ]);
default = 4; default = "auto";
}; };
workDirectory = mkOption { workDirectory = mkOption {
description = '' description = ''