is it possible to limit parallel tests in xcuitest?

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Im doing uitest, in test plan theres 'execute in parallel (if possible)' option. However this launches 5 simulator in my case, consuming all 32gb of ram (and some swap) and tests fails for unknown reasons, is it possible to limit maximum number of launched simulator clones?

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You can reduce the number in Xcode's General Preferences. The automatic number is frequently flaky.

screenshot of preferences