Don't use more than availableProcessors threads for parallel tests in ContextLocalTest using vthreads.

jchalou · jchalou · commit 1c0a6f034027 · 2025-06-03T13:18:09.000+02:00
diff --git a/truffle/src/com.oracle.truffle.api.test/src/com/oracle/truffle/api/test/polyglot/ContextLocalTest.java b/truffle/src/com.oracle.truffle.api.test/src/com/oracle/truffle/api/test/polyglot/ContextLocalTest.java
@@ -156,7 +156,7 @@ public String get(Thread t) {
     }
 
     private static void runInParallel(boolean vthreads, Runnable callable) throws InterruptedException, ExecutionException {
-        ExecutorService executor = threadPool(PARALLELISM, vthreads);
+        ExecutorService executor = threadPool(vthreads ? Math.min(PARALLELISM, Runtime.getRuntime().availableProcessors()) : PARALLELISM, vthreads);
         List<Future<?>> futures = new ArrayList<>();
         /*
          * For virtual threads, we want a number of iterations well above the maxPoolSize of

Original file line number	Diff line number	Diff line change
`@@ -156,7 +156,7 @@ public String get(Thread t) {`
`156`	`156`	`}`
`157`	`157`
`158`	`158`	`private static void runInParallel(boolean vthreads, Runnable callable) throws InterruptedException, ExecutionException {`
`159`		`- ExecutorService executor = threadPool(PARALLELISM, vthreads);`
	`159`	`+ ExecutorService executor = threadPool(vthreads ? Math.min(PARALLELISM, Runtime.getRuntime().availableProcessors()) : PARALLELISM, vthreads);`
`160`	`160`	`List<Future<?>> futures = new ArrayList<>();`
`161`	`161`	`/*`
`162`	`162`	`* For virtual threads, we want a number of iterations well above the maxPoolSize of`