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ci: macos: Reduce test concurrency
Test performance regresses noticably when using all cores. This is more pronounced with meson than with autoconf, presumably because meson will schedule the "full number" of tests more consistently. 8 seems to work OK. Discussion: https://postgr.es/m/20220927040208.l3shfcidovpzqxfh@awork3.anarazel.de Backpatch: 15-, where CI was introduced
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.cirrus.yml

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@@ -294,7 +294,10 @@ task:
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env:
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CPUS: 12 # always get that much for cirrusci macOS instances
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BUILD_JOBS: $CPUS
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TEST_JOBS: $CPUS # already fast enough to not be worth tuning
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# Test performance regresses noticably when using all cores. 8 seems to
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# work OK. See
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# https://postgr.es/m/20220927040208.l3shfcidovpzqxfh%40awork3.anarazel.de
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TEST_JOBS: 8
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CIRRUS_WORKING_DIR: ${HOME}/pgsql/
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CCACHE_DIR: ${HOME}/ccache

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