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