1:02 a.m.
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Hi All,
On engine core, The usage CPU percentage is calculated by %sys + %usr
class VdsBrokerObjectsBuilder
function updateVDSStatisticsData
vds.setCpuSys(AssignDoubleValue(xmlRpcStruct, VdsProperties.cpu_sys));
vds.setCpuUser(AssignDoubleValue(xmlRpcStruct, VdsProperties.cpu_us=
er));
if (vds.getCpuSys() !=3D null && vds.getCpuUser() !=3D null) {
vds.setUsageCpuPercent((int) (vds.getCpuSys() + vds.getCpuUser(=
)));
}
On vdsm, The %sys, %usr and %idle is calculated like below workflow,
class API
function getStats
decStats =3D self._cif._hostStats.get()
class clientIF
function __init__
self._hostStats =3D sampling.HostStatsThread(log=3Dlog)
self._hostStats.start()
class HostStatsThread
function get
hs0, hs1 =3D self._samples[0], self._samples[-1]
...
jiffies =3D (hs1.totcpu.user - hs0.totcpu.user) % (2 ** =
32)
stats['cpuUser'] =3D jiffies / interval / self._ncpus
jiffies =3D (hs1.totcpu.sys - hs0.totcpu.sys) % (2 ** 32)
stats['cpuSys'] =3D jiffies / interval / self._ncpus
stats['cpuIdle'] =3D max(0.0, 100.0 - stats['cpuUser'] -
stats['cpu=
Sys'])
class HostSample
function __init__
self.totcpu =3D TotalCpuSample()
class TotalCpuSample
function __init__
self.user, userNice, self.sys, self.idle =3D \
map(int, file('/proc/stat').readline().split()[1:5])
self.user +=3D userNice
Question1: Why stats['cpuIdle'] do not use the sampling data totcpu.idle fo=
r calculating?
Question2: There is another data named iowait in /proc/stat, do we need to =
consider add this into usage CPU percentage for calculating?
Best Regards,
Jason Liao
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</head <body lang=3D"ZH-CN"
link=3D"#0563C1" vlink=3D"#954F72" style=3D"text-justi=
fy-trim:punctuation" <div
class=3D"WordSection1" <p
class=3D"MsoNormal"><span lang=3D"EN-US"
style=3D"font-family:"HP S=
implified","sans-serif"">Hi
All,<o:p></o:p></span></p <p
class=3D"MsoNormal"><span lang=3D"EN-US"
style=3D"font-family:"HP S=
implified","sans-serif""><o:p> </o:p></span></p <p class=3D"MsoNormal"><span
lang=3D"EN-US" style=3D"font-family:"HP S=
implified","sans-serif"">On engine core, The usage CPU
perce=
ntage is calculated by %sys + %usr<o:p></o:p></span></p <p class=3D"MsoNormal"><span
lang=3D"EN-US" style=3D"font-family:"HP S=
implified","sans-serif""><o:p> </o:p></span></p <p class=3D"MsoNormal"><span
lang=3D"EN-US" style=3D"font-family:"HP S=
implified","sans-serif"">class VdsBrokerObjectsBuilder
<o:p></o:p></span></p <p
class=3D"MsoNormal"><span lang=3D"EN-US"
style=3D"font-family:"HP S=
implified","sans-serif"">function
updateVDSStatisticsData<o:=
p></o:p></span></p <p
class=3D"MsoNormal"
style=3D"margin-left:21.0pt;text-indent:21.0pt"><spa=
n lang=3D"EN-US" style=3D"font-family:"HP
Simplified","sans-=
serif"">vds.setCpuSys(AssignDoubleValue(xmlRpcStruct, VdsProperties.cp=
u_sys));<o:p></o:p></span></p <p
class=3D"MsoNormal"><span lang=3D"EN-US"
style=3D"font-family:"HP S=
implified","sans-serif"">  =
; vds.setCpuUser(AssignDoubleValue(xmlRpcStruct, VdsProperties.cpu_us=
er));<o:p></o:p></span></p <p
class=3D"MsoNormal"><span lang=3D"EN-US"
style=3D"font-family:"HP S=
implified","sans-serif"">  =
; if (vds.getCpuSys() !=3D null && vds.getCpuUser() !=3D null=
) {<o:p></o:p></span></p <p
class=3D"MsoNormal"><span lang=3D"EN-US"
style=3D"font-family:"HP S=
implified","sans-serif"">  =
; vds.setUsageCpuPercent((int)
(vds.getCpuSys=
() + vds.getCpuUser()));<o:p></o:p></span></p <p class=3D"MsoNormal"><span
lang=3D"EN-US" style=3D"font-family:"HP S=
implified","sans-serif"">  =
; }<o:p></o:p></span></p <p
class=3D"MsoNormal"><span lang=3D"EN-US"
style=3D"font-family:"HP S=
implified","sans-serif""><o:p> </o:p></span></p <p class=3D"MsoNormal"><span
lang=3D"EN-US" style=3D"font-family:"HP S=
implified","sans-serif"">On vdsm, The %sys, %usr and
%idle i=
s calculated like below workflow,<o:p></o:p></span></p <p class=3D"MsoNormal"><span
lang=3D"EN-US" style=3D"font-family:"HP S=
implified","sans-serif""><o:p> </o:p></span></p <p class=3D"MsoNormal"><span
lang=3D"EN-US" style=3D"font-family:"HP S=
implified","sans-serif"">class
API<o:p></o:p></span></p <p
class=3D"MsoNormal"><span lang=3D"EN-US"
style=3D"font-family:"HP S=
implified","sans-serif"">function
getStats<o:p></o:p></span>=
</p <p class=3D"MsoNormal"
style=3D"margin-left:21.0pt;text-indent:21.0pt"><spa=
n lang=3D"EN-US" style=3D"font-family:"HP
Simplified","sans-=
serif"">decStats =3D
self._cif._hostStats.get()<o:p></o:p></span></p <p class=3D"MsoNormal"><span
lang=3D"EN-US" style=3D"font-family:"HP S=
implified","sans-serif"">class
clientIF<o:p></o:p></span></p=
<p class=3D"MsoNormal"><span
lang=3D"EN-US" style=3D"font-family:"HP S=
implified","sans-serif"">function
__init__<o:p></o:p></span>=
</p <p class=3D"MsoNormal"><span
lang=3D"EN-US" style=3D"font-family:"HP S=
implified","sans-serif"">  =
;
s=
elf._hostStats =3D
sampling.HostStatsThread(log=3Dlog)<o:p></o:p></span></p=
<p class=3D"MsoNormal"><span
lang=3D"EN-US" style=3D"font-family:"HP S=
implified","sans-serif"">  =
; self._hostStats.start()<o:p></o:p></span></p <p class=3D"MsoNormal"><span
lang=3D"EN-US" style=3D"font-family:"HP S=
implified","sans-serif"">class
HostStatsThread<o:p></o:p></s=
pan></p <p
class=3D"MsoNormal"><span lang=3D"EN-US"
style=3D"font-family:"HP S=
implified","sans-serif"">function
get<o:p></o:p></span></p <p
class=3D"MsoNormal"><span lang=3D"EN-US"
style=3D"font-family:"HP S=
implified","sans-serif"">  =
;
h=
s0, hs1 =3D self._samples[0],
self._samples[-1]<o:p></o:p></span></p <p
class=3D"MsoNormal"><span lang=3D"EN-US"
style=3D"font-family:"HP S=
implified","sans-serif"">  =
;
&=
#8230;<o:p></o:p></span></p <p
class=3D"MsoNormal"><span lang=3D"EN-US"
style=3D"font-family:"HP S=
implified","sans-serif"">  =
;
j=
iffies =3D (hs1.totcpu.user - hs0.totcpu.user) % (2 **
32)<o:p></o:p></span=
></p <p
class=3D"MsoNormal"><span lang=3D"EN-US"
style=3D"font-family:"HP S=
implified","sans-serif"">  =
; stats['cpuUser'] =3D jiffies / interval /
self._ncpus<o:p></o:p></s=
pan></p <p
class=3D"MsoNormal"><span lang=3D"EN-US"
style=3D"font-family:"HP S=
implified","sans-serif"">  =
; jiffies =3D (hs1.totcpu.sys - hs0.totcpu.sys) % (2 ** 32)<o:p></o:p=
></span></p <p
class=3D"MsoNormal"><span lang=3D"EN-US"
style=3D"font-family:"HP S=
implified","sans-serif"">  =
; stats['cpuSys'] =3D jiffies / interval /
self._ncpus<o:p></o:p></sp=
an></p <p
class=3D"MsoNormal"><span lang=3D"EN-US"
style=3D"font-family:"HP S=
implified","sans-serif"">  =
; stats['cpuIdle'] =3D max(0.0, 100.0 - stats['cpuUser'] -
stats['cpu=
Sys'])<o:p></o:p></span></p <p
class=3D"MsoNormal"><span lang=3D"EN-US"
style=3D"font-family:"HP S=
implified","sans-serif"">class
HostSample<o:p></o:p></span><=
/p <p class=3D"MsoNormal"><span
lang=3D"EN-US" style=3D"font-family:"HP S=
implified","sans-serif"">function
__init__<o:p></o:p></span>=
</p <p class=3D"MsoNormal"><span
lang=3D"EN-US" style=3D"font-family:"HP S=
implified","sans-serif"">  =
;
s=
elf.totcpu =3D TotalCpuSample()<o:p></o:p></span></p <p class=3D"MsoNormal"><span
lang=3D"EN-US" style=3D"font-family:"HP S=
implified","sans-serif"">class
TotalCpuSample<o:p></o:p></sp=
an></p <p
class=3D"MsoNormal"><span lang=3D"EN-US"
style=3D"font-family:"HP S=
implified","sans-serif"">function
__init__<o:p></o:p></span>=
</p <p class=3D"MsoNormal"><span
lang=3D"EN-US" style=3D"font-family:"HP S=
implified","sans-serif"">  =
; self.user, userNice, self.sys, self.idle =3D
\<o:p></o:p></sp=
an></p <p
class=3D"MsoNormal"><span lang=3D"EN-US"
style=3D"font-family:"HP S=
implified","sans-serif"">  =
; map(int,
file('/proc/stat').readline().spli=
t()[1:5])<o:p></o:p></span></p <p
class=3D"MsoNormal"><span lang=3D"EN-US"
style=3D"font-family:"HP S=
implified","sans-serif"">  =
; self.user +=3D userNice<o:p></o:p></span></p <p class=3D"MsoNormal"><span
lang=3D"EN-US" style=3D"font-family:"HP S=
implified","sans-serif""><o:p> </o:p></span></p <p class=3D"MsoNormal"><span
lang=3D"EN-US" style=3D"font-family:"HP S=
implified","sans-serif"">Question1: Why
stats[‘cpuIdle=
’] do not use the sampling data totcpu.idle for calculating?<o:p></o:=
p></span></p <p
class=3D"MsoNormal"><span lang=3D"EN-US"
style=3D"font-family:"HP S=
implified","sans-serif""><o:p> </o:p></span></p <p class=3D"MsoNormal"><span
lang=3D"EN-US" style=3D"font-family:"HP S=
implified","sans-serif"">Question2: There is another
data na=
med iowait in /proc/stat, do we need to consider add this into usage CPU pe=
rcentage for calculating?<o:p></o:p></span></p <p class=3D"MsoNormal"><span
lang=3D"EN-US" style=3D"font-family:"HP S=
implified","sans-serif""><o:p> </o:p></span></p <p class=3D"MsoNormal"><b><span
lang=3D"EN-US" style=3D"font-size:9.0pt;fon=
t-family:"HP
Simplified","sans-serif";color:black">Best=
Regards,<br </span></b><span
lang=3D"EN-US" style=3D"font-size:9.0pt;font-family:"=
HP Simplified","sans-serif";color:#717172">Jason
Liao</span>=
<span lang=3D"EN-US"><o:p></o:p></span></p <p class=3D"MsoNormal"><span
lang=3D"EN-US"><o:p> </o:p></span></p </div
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