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<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif"">Hi All,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif"">On engine core, The usage CPU percentage is calculated by %sys + %usr<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif"">class VdsBrokerObjectsBuilder
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif"">function updateVDSStatisticsData<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:21.0pt;text-indent:21.0pt"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif"">vds.setCpuSys(AssignDoubleValue(xmlRpcStruct, VdsProperties.cpu_sys));<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif""> vds.setCpuUser(AssignDoubleValue(xmlRpcStruct, VdsProperties.cpu_user));<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif""> if (vds.getCpuSys() != null && vds.getCpuUser() != null) {<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif""> vds.setUsageCpuPercent((int) (vds.getCpuSys() + vds.getCpuUser()));<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif""> }<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif"">On vdsm, The %sys, %usr and %idle is calculated like below workflow,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif"">class API<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif"">function getStats<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:21.0pt;text-indent:21.0pt"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif"">decStats = self._cif._hostStats.get()<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif"">class clientIF<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif"">function __init__<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif""> self._hostStats = sampling.HostStatsThread(log=log)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif""> self._hostStats.start()<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif"">class HostStatsThread<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif"">function get<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif""> hs0, hs1 = self._samples[0], self._samples[-1]<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif""> …<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif""> jiffies = (hs1.totcpu.user - hs0.totcpu.user) % (2 ** 32)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif""> stats['cpuUser'] = jiffies / interval / self._ncpus<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif""> jiffies = (hs1.totcpu.sys - hs0.totcpu.sys) % (2 ** 32)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif""> stats['cpuSys'] = jiffies / interval / self._ncpus<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif""> stats['cpuIdle'] = max(0.0, 100.0 - stats['cpuUser'] - stats['cpuSys'])<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif"">class HostSample<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif"">function __init__<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif""> self.totcpu = TotalCpuSample()<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif"">class TotalCpuSample<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif"">function __init__<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif""> self.user, userNice, self.sys, self.idle = \<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif""> map(int, file('/proc/stat').readline().split()[1:5])<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif""> self.user += userNice<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif"">Question1: Why stats[‘cpuIdle’] do not use the sampling data totcpu.idle for calculating?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif"">Question2: There is another data named iowait in /proc/stat, do we need to consider add this into usage CPU percentage for calculating?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"HP Simplified","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:9.0pt;font-family:"HP Simplified","sans-serif";color:black">Best Regards,<br>
</span></b><span lang="EN-US" style="font-size:9.0pt;font-family:"HP Simplified","sans-serif";color:#717172">Jason Liao</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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