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max-substitution-jobs release note entry

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This commit is contained in:
Matej Urbas 2023-05-13 11:25:06 +01:00
parent 916da456cb
commit c66a7af0c6
2 changed files with 7 additions and 4 deletions
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4
doc/manual/src/release-notes/rl-next.md
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@ -1,2 +1,6 @@
# Release X.Y (202?-??-??)
- Speed-up of downloads from binary caches.
The number of parallel downloads (also known as substitutions) has been separated from the [`--max-jobs` setting](../command-ref/conf-file.md#conf-max-jobs).
The new setting is called [`max-substitution-jobs`](../command-ref/conf-file.md#conf-max-substitution-jobs).
The number of parallel downloads is now set to 16 by default (previously, the default was 1 due to the coupling to build jobs).

7
src/libstore/build/substitution-goal.cc
View file

@ -200,10 +200,9 @@ void PathSubstitutionGoal::tryToRun()
{
trace("trying to run");
/* Make sure that we are allowed to start a build. Note that even
if maxBuildJobs == 0 (no local builds allowed), we still allow
a substituter to run. This is because substitutions cannot be
distributed to another machine via the build hook. */
/* Make sure that we are allowed to start a substitution. Note that even
if maxSubstitutionJobs == 0, we still allow a substituter to run. This
prevents infinite waiting. */
if (worker.getNrSubstitutions() >= std::max(1U, (unsigned int) settings.maxSubstitutionJobs)) {
worker.waitForBuildSlot(shared_from_this());
return;