cores is same machine reporting different bogo mips rating ?

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cores is same machine reporting different bogo mips rating ?

cores is same machine reporting different bogo mips rating ?

2006-10-18 - By Bob Flynn (bobf)

Back

Reply: 1 2

Hi,

I have a machine, which is reporting 4 cpus. It is 2 AMD processors, and
2 cores in each processor.

The 4 cores are not reporting the same bogomips ? Should they.

To explain.

test_HOME> grep AMD /proc/cpuinfo

vendor_id : AuthenticAMD

model name : Dual Core AMD Opteron(tm) Processor 265

vendor_id : AuthenticAMD

model name : Dual Core AMD Opteron(tm) Processor 265

vendor_id : AuthenticAMD

model name : Dual Core AMD Opteron(tm) Processor 265

vendor_id : AuthenticAMD

model name : Dual Core AMD Opteron(tm) Processor 265

test_HOME> grep bogo /proc/cpuinfo

bogomips : 3578.26

bogomips : 3578.26

bogomips : 3578.26

bogomips : 6710.88

note how the last core is reporting the higher figure. As LSF seems to
take the highest figure and append to this to create an architecture, a
similar box can report as different architectures under LSF. We can
tweak LSF so they will by classed as the same, but why, and should 1
core is reporting a higher figure are the questions.

( LSF is the application we are using to manage jobs to this box ).

The version of linux running is;

test_HOME> cat /etc/redhat-release

Red Hat Enterprise Linux WS release 3 (Taroon Update 8)

test_HOME> uname -a

Linux test 2.4.21-47.ELsmp #1 SMP Wed Jul 5 20:30:30 EDT 2006 x86_64
x86_64 x86

_64 GNU/Linux

Any pointers are appreciated.

Basically, is this correct behaviour ?

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<div class=Section1>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hi,</span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I have a machine, which is reporting 4 cpus. It is 2 AMD
processors, and 2 cores in each processor.</span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>The 4 cores are not reporting the same bogomips ? Should
they.</span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>To explain.</span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>test_HOME> grep AMD /proc/cpuinfo</span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>vendor_id       : AuthenticAMD
</span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>model name      : Dual Core AMD
Opteron(tm)
Processor 265</span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>vendor_id       : AuthenticAMD
</span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>model name      : Dual Core AMD
Opteron(tm)
Processor 265</span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>vendor_id       : AuthenticAMD
</span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>model name      : Dual Core AMD
Opteron(tm)
Processor 265</span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>vendor_id       : AuthenticAMD
</span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>model name      : Dual Core AMD
Opteron(tm)
Processor 265</span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>test_HOME> grep bogo /proc/cpuinfo</span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>bogomips        : 3578.26
</span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>bogomips        : 3578.26
</span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>bogomips        : 3578.26
</span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>bogomips        : 6710.88
</span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>note how the last core is reporting the higher figure. As
LSF seems to take the highest figure and append to this to create an
architecture, a similar box can report as different architectures under LSF. We
can tweak LSF so they will by classed as the same, but why, and should  1
core is reporting a higher figure are the questions.</span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>( LSF is the application we are using to manage jobs to this
box ).</span></font></p>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>The version of linux running is;</span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>test_HOME> cat /etc/redhat-release</span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Red Hat Enterprise Linux WS release 3 (Taroon Update 8)<
/span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>test_HOME> uname -a</span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Linux test 2.4.21-47.ELsmp #1 SMP Wed Jul 5 </span></font>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>20:30
:30 EDT</span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> 2006 x86_64
x86_64 x86</span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>_64 GNU/Linux</span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Any pointers are appreciated. </span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Basically, is this correct behaviour ?</span></font></p>

</div>

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