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https://issues.apache.org/jira/browse/HADOOP-12356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15061391#comment-15061391
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Inigo Goiri commented on HADOOP-12356:
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{code:title=SysInfoLinux.java|borderStyle=solid}
@Override
public float getCpuUsage() {
readProcStatFile();
float overallCpuUsage = cpuTimeTracker.getCpuTrackerUsagePercent();
if (overallCpuUsage != CpuTimeTracker.UNAVAILABLE) {
overallCpuUsage = overallCpuUsage / getNumProcessors();
}
return overallCpuUsage;
}
{code}
This shows that it will take the summation of all the CPU percentages and
divide it by the number of cores to make a number between 0 and 100.
> CPU usage statistics on Windows
> -------------------------------
>
> Key: HADOOP-12356
> URL: https://issues.apache.org/jira/browse/HADOOP-12356
> Project: Hadoop Common
> Issue Type: Bug
> Components: util
> Environment: CPU: Intel Xeon
> OS: Windows server
> Reporter: Yunqi Zhang
> Assignee: Yunqi Zhang
> Labels: easyfix, newbie, patch
> Attachments: 0001-Correct-the-CPU-usage-calcualtion.patch,
> 0001-Correct-the-CPU-usage-calcualtion.patch, HADOOP-12356-v3.patch
>
> Original Estimate: 2h
> Remaining Estimate: 2h
>
> The CPU usage information on Windows is computed incorrectly. The proposed
> patch fixes the issue, and unifies the the interface with Linux.
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