Display the correct number of processes used, when using '--debug'.

.github/workflows/e2e-tests.yml

@@ -436,6 +436,16 @@ jobs:
               cd e2e/bug-14036
               composer install
               ../../bin/phpstan analyze
+          - script: |
+              cd e2e/vvv-with-debug
+              OUTPUT=$(../../bin/phpstan analyze -l 0 -vvv --debug test.php 2>&1)
+              echo "$OUTPUT"
+              ../bashunit -a contains '# of spawned processes:    1' "$OUTPUT"
+          - script: |
+              cd e2e/vvv-with-debug
+              OUTPUT=$(../../bin/phpstan analyze -l 0 -vvv --debug --configuration parallel.neon test.php 2>&1)
+              echo "$OUTPUT"
+              ../bashunit -a contains '# of spawned processes:    1' "$OUTPUT"
 
     steps:
       - name: Harden the runner (Audit all outbound calls)

e2e/vvv-with-debug/parallel.neon

@@ -0,0 +1,3 @@
+parameters:
+    parallel:
+        maximumNumberOfProcesses: 2

e2e/vvv-with-debug/test.php

@@ -0,0 +1 @@
+<?php

src/Command/AnalyserRunner.php

@@ -71,7 +71,7 @@ public function runAnalyser(
 			);
 		}
 
-		$schedule = $this->scheduler->scheduleWork($this->cpuCoreCounter->getNumberOfCpuCores(), $files);
+		$schedule = $this->scheduler->scheduleWork($this->cpuCoreCounter->getNumberOfCpuCores(), $files, $debug);
 		$mainScript = null;
 		if (isset($_SERVER['argv'][0]) && is_file($_SERVER['argv'][0])) {
 			$mainScript = $_SERVER['argv'][0];

src/Command/FixerWorkerCommand.php

@@ -413,7 +413,7 @@ private function runAnalyser(LoopInterface $loop, Container $container, array $f
 		/** @var CpuCoreCounter $cpuCoreCounter */
 		$cpuCoreCounter = $container->getByType(CpuCoreCounter::class);
 
-		$schedule = $scheduler->scheduleWork($cpuCoreCounter->getNumberOfCpuCores(), $files);
+		$schedule = $scheduler->scheduleWork($cpuCoreCounter->getNumberOfCpuCores(), $files, false);
 		$mainScript = null;
 		if (isset($_SERVER['argv'][0]) && is_file($_SERVER['argv'][0])) {
 			$mainScript = $_SERVER['argv'][0];

src/Parallel/Scheduler.php

@@ -42,10 +42,11 @@ public function __construct(
 	public function scheduleWork(
 		int $cpuCores,
 		array $files,
+		bool $debug = false,
 	): Schedule
 	{
 		$jobs = array_chunk($files, $this->jobSize);
-		$numberOfProcesses = min(
+		$numberOfProcesses = $debug ? 1 : min(
 			max((int) floor(count($jobs) / $this->minimumNumberOfJobsPerProcess), 1),
 			$cpuCores,
 		);

tests/PHPStan/Parallel/SchedulerTest.php

@@ -68,6 +68,16 @@ public static function dataSchedule(): array
 				1,
 				[1],
 			],
+			[
+				16,
+				16,
+				2,
+				20,
+				100,
+				1,
+				[20, 20, 20, 20, 20],
+				true,
+			],
 		];
 	}
 
@@ -87,11 +97,12 @@ public function testSchedule(
 		int $numberOfFiles,
 		int $expectedNumberOfProcesses,
 		array $expectedJobSizes,
+		bool $debug = false,
 	): void
 	{
 		$files = array_fill(0, $numberOfFiles, 'file.php');
 		$scheduler = new Scheduler($jobSize, $maximumNumberOfProcesses, $minimumNumberOfJobsPerProcess);
-		$schedule = $scheduler->scheduleWork($cpuCores, $files);
+		$schedule = $scheduler->scheduleWork($cpuCores, $files, $debug);
 
 		$this->assertSame($expectedNumberOfProcesses, $schedule->getNumberOfProcesses());
 		$jobSizes = array_map(static fn (array $job): int => count($job), $schedule->getJobs());