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Bug
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Resolution: Duplicate
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P4
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8u341
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x86_64
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linux
ADDITIONAL SYSTEM INFORMATION :
System where the method fails
Os
Linux 4.18.5-1.el7.elrepo.x86_64 #1 SMP Fri Aug 24 11:35:05 EDT 2018 x86_64 x86_64 x86_64 GNU/Linux
CPU Intel(R) Xeon(R) CPU E5-2699 v4 @ 2.20GHz
Works on the same os with this CPU
Intel(R) Xeon(R) Silver 4215R CPU @ 3.20GHz
Tried out JDK versions which not works
8.342.07-4, 11.0.16.9.1, 17.0.1.12.1, 18.0.2.9.1
Works only on jdk-19
A DESCRIPTION OF THE PROBLEM :
This issue only came up on this CPU and this Os. On other machine with the same Os the code works fine.
STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Build the minimal code on any of the above jdk versions (8.342.07-4, 11.0.16.9.1, 17.0.1.12.1, 18.0.2.9.1) like
jdk-18.0.2.1/bin/javac Main.java
and run it like
jdk-18.0.2.1/bin/java Main
EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
cpu util value 0.03203806502775575
cpu util value 0.032299124900556885
ACTUAL -
cpu util value -1.0
cpu util value -1.0
---------- BEGIN SOURCE ----------
import java.lang.management.ManagementFactory;
import java.lang.management.OperatingSystemMXBean;
import java.util.Random;
public class Main {
public static void main(String[] args) {
Thread thread = new Thread(new Runnable() {
@Override
public void run() {
while (true) {
int a = 1234;
int b = a * new Random().nextInt();
}
}
});
thread.start();
int i = 1;
while (i < 10) {
OperatingSystemMXBean operatingSystemMXBean = ManagementFactory.getOperatingSystemMXBean();
double cpuUtil = ((com.sun.management.OperatingSystemMXBean) operatingSystemMXBean).getProcessCpuLoad();
System.out.println("cpu util value " + cpuUtil);
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
i++;
}
thread.stop();
}
}
---------- END SOURCE ----------
FREQUENCY : always
System where the method fails
Os
Linux 4.18.5-1.el7.elrepo.x86_64 #1 SMP Fri Aug 24 11:35:05 EDT 2018 x86_64 x86_64 x86_64 GNU/Linux
CPU Intel(R) Xeon(R) CPU E5-2699 v4 @ 2.20GHz
Works on the same os with this CPU
Intel(R) Xeon(R) Silver 4215R CPU @ 3.20GHz
Tried out JDK versions which not works
8.342.07-4, 11.0.16.9.1, 17.0.1.12.1, 18.0.2.9.1
Works only on jdk-19
A DESCRIPTION OF THE PROBLEM :
This issue only came up on this CPU and this Os. On other machine with the same Os the code works fine.
STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Build the minimal code on any of the above jdk versions (8.342.07-4, 11.0.16.9.1, 17.0.1.12.1, 18.0.2.9.1) like
jdk-18.0.2.1/bin/javac Main.java
and run it like
jdk-18.0.2.1/bin/java Main
EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
cpu util value 0.03203806502775575
cpu util value 0.032299124900556885
ACTUAL -
cpu util value -1.0
cpu util value -1.0
---------- BEGIN SOURCE ----------
import java.lang.management.ManagementFactory;
import java.lang.management.OperatingSystemMXBean;
import java.util.Random;
public class Main {
public static void main(String[] args) {
Thread thread = new Thread(new Runnable() {
@Override
public void run() {
while (true) {
int a = 1234;
int b = a * new Random().nextInt();
}
}
});
thread.start();
int i = 1;
while (i < 10) {
OperatingSystemMXBean operatingSystemMXBean = ManagementFactory.getOperatingSystemMXBean();
double cpuUtil = ((com.sun.management.OperatingSystemMXBean) operatingSystemMXBean).getProcessCpuLoad();
System.out.println("cpu util value " + cpuUtil);
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
i++;
}
thread.stop();
}
}
---------- END SOURCE ----------
FREQUENCY : always
- duplicates
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JDK-8265104 CpuLoad and SystemCpuLoad in OperatingSystem MXBean returns -1.0
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- Resolved
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