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8359827: Test runtime/Thread/ThreadCountLimit.java need loop increasing the limit

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Co-authored-by: David Holmes <dholmes@openjdk.org>
Reviewed-by: dholmes
This commit is contained in:
SendaoYan 2025-07-24 01:47:58 +00:00
parent b746701e57
commit fc8038441d
1 changed files with 20 additions and 7 deletions
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27
test/hotspot/jtreg/runtime/Thread/ThreadCountLimit.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2020, 2024, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2020, 2025, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -73,14 +73,27 @@ public class ThreadCountLimit {
if (Platform.isLinux()) {
// On Linux this test sometimes hits the limit for the maximum number of memory mappings,
// which leads to various other failure modes. Run this test with a limit on how many
// threads the process is allowed to create, so we hit that limit first.
final String ULIMIT_CMD = "ulimit -u 4096";
// threads the process is allowed to create, so we hit that limit first. What we want is
// for another "limit" processes to be available, but ulimit doesn't work that way and
// if there are already many running processes we could fail to even start the JVM properly.
// So we loop increasing the limit until we get a successful run. This is not foolproof.
int pLimit = 4096;
final String ULIMIT_CMD = "ulimit -u ";
ProcessBuilder pb = ProcessTools.createTestJavaProcessBuilder(ThreadCountLimit.class.getName());
String javaCmd = ProcessTools.getCommandLine(pb);
// Relaunch the test with args.length > 0, and the ulimit set
ProcessTools.executeCommand("bash", "-c", ULIMIT_CMD + " && " + javaCmd + " dummy")
.shouldHaveExitValue(0);
for (int i = 1; i <= 10; i++) {
// Relaunch the test with args.length > 0, and the ulimit set
String cmd = ULIMIT_CMD + Integer.toString(pLimit * i) + " && " + javaCmd + " dummy";
System.out.println("Trying: bash -c " + cmd);
OutputAnalyzer oa = ProcessTools.executeCommand("bash", "-c", cmd);
int exitValue = oa.getExitValue();
switch (exitValue) {
case 0: System.out.println("Success!"); return;
case 1: System.out.println("Retry ..."); continue;
default: oa.shouldHaveExitValue(0); // generate error report
}
}
throw new Error("Failed to perform a successful run!");
} else {
// Not Linux so run directly.
test();