JDK-8264572 : ForkJoinPool.getCommonPoolParallelism() reports always 1
- Type: Bug
- Component: core-libs
- Sub-Component: java.util.concurrent
- Affected Version: 17
- Priority: P3
- Status: Closed
- Resolution: Fixed
- OS: windows_10
- CPU: x86_64
- Submitted: 2021-03-31
- Updated: 2021-04-13
- Resolved: 2021-04-02
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| JDK 17 |
|---|
17 b17Fixed  |
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Description
ADDITIONAL SYSTEM INFORMATION :
Win10 20H2 (Build19042.868)
Java: 17-ea+11-835
CPU: i7-8700K
A DESCRIPTION OF THE PROBLEM :
A call to ForkJoinPool.getCommonPoolParallelism() will report "1" on my machine (JDK 16 = 11!)
If you think its a "special" problem on my machine - contact me.
STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Just run getCommonPoolParallelism()
EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Version: java.version: 16, OpenJDK 64-Bit Server VM, 16+36-2231
OS: Windows 10 Version 10.0 (amd64)
CPUs: 12
fjp: 11
ACTUAL -
Version: java.version: 17-ea, OpenJDK 64-Bit Server VM, 17-ea+11-835
OS: Windows 10 Version 10.0 (amd64)
CPUs: 12
fjp: 1
---------- BEGIN SOURCE ----------
public class TestFjp {
public static void main(String[] args) {
System.out.println("Version: " + getJavaVersion());
System.out.println("OS: " + getOsInofrmation());
System.out.println("CPUs: " + Runtime.getRuntime().availableProcessors());
System.out.println("fjp: " + ForkJoinPool.getCommonPoolParallelism());
}
private static String getJavaVersion() {
return "java.version: " //
+ System.getProperty("java.version")//
+ ", " + System.getProperty("java.vm.name")//
+ ", " + System.getProperty("java.runtime.version");
}
private static String getOsInofrmation() {
return System.getProperty("os.name") + " Version "
+ System.getProperty("os.version") + " (" + System.getProperty("os.arch") + ") ";
}
}
---------- END SOURCE ----------
CUSTOMER SUBMITTED WORKAROUND :
Using "Runtime.getRuntime().availableProcessors())" won't work on foreign software.
FREQUENCY : always
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