Different method to compute CPU cores to use

Author: ondrejmirtes

conf/config.neon

@@ -95,6 +95,7 @@ parameters:
 		maximumNumberOfProcesses: 8
 		minimumNumberOfJobsPerProcess: 2
 		buffer: 134217728 # 128 MB
+		loadLimit: 1.0
 	phpVersion: null
 	polluteScopeWithLoopInitialAssignments: true
 	polluteScopeWithAlwaysIterableForeach: true

conf/parametersSchema.neon

@@ -99,7 +99,8 @@ parametersSchema:
 		processTimeout: float(),
 		maximumNumberOfProcesses: int(),
 		minimumNumberOfJobsPerProcess: int(),
-		buffer: int()
+		buffer: int(),
+		loadLimit: schema(float(), nullable())
 	])
 	phpVersion: schema(anyOf(
 		schema(int(), min(70100), max(80599)),

src/Process/CpuCoreCounter.php

@@ -4,6 +4,7 @@
 
 use Fidry\CpuCoreCounter\CpuCoreCounter as FidryCpuCoreCounter;
 use Fidry\CpuCoreCounter\NumberOfCpuCoreNotFound;
+use PHPStan\DependencyInjection\AutowiredParameter;
 use PHPStan\DependencyInjection\AutowiredService;
 
 #[AutowiredService]
@@ -12,14 +13,21 @@ final class CpuCoreCounter
 
 	private ?int $count = null;
 
+	public function __construct(
+		#[AutowiredParameter(ref: '%parallel.loadLimit%')]
+		private ?float $loadLimit,
+	)
+	{
+	}
+
 	public function getNumberOfCpuCores(): int
 	{
 		if ($this->count !== null) {
 			return $this->count;
 		}
 
 		try {
-			$this->count = (new FidryCpuCoreCounter())->getCount();
+			$this->count = (new FidryCpuCoreCounter())->getAvailableForParallelisation(0, null, $this->loadLimit)->availableCpus;
 		} catch (NumberOfCpuCoreNotFound) {
 			$this->count = 1;
 		}