[TriLUG] Intel processor Temperaturs

[Steve Litt]

On Wednesday 12 May 2010 09:26:03 John Broome wrote:
> On Tue, May 11, 2010 at 20:54, Ralph Blach <chipperb at nc.rr.com> wrote:
> > I have a dual core Intel(R) Core(TM)2 Duo CPU     E7500  @ 2.93GHz and
> > when it is idling it runs about
> > 43 C but when I start up VirutalBox, and do a compile the temperature
> > seems to go up to about 68 to 71 C
> >
> > Is this normal?
> 
> So the temp spikes when you're doing a highly CPU intensive task then
> drops when that task is done?  I'd say that's normal.

It's a matter of degree though. My dual Pentium regularly runs at 54 and 51C, 
respectively. I hammered it with my Sieve or Erasthanes prime number generator 
(http://www.troubleshooters.com/codecorn/primenumbers/primenumbers.htm#_Implementation:_Scalability_Through_Paging), 
and the temps went up to 58 and 54C respectively.

top - 09:47:05 up 15 days, 13:34, 19 users,  load average: 10.66, 11.25, 8.95
Tasks: 355 total,  12 running, 341 sleeping,   0 stopped,   2 zombie
Cpu(s): 81.3%us, 18.5%sy,  0.0%ni,  0.0%id,  0.0%wa,  0.0%hi,  0.2%si,  0.0%st
Mem:   3346096k total,  2845260k used,   500836k free,   379852k buffers
Swap: 24579408k total,   106864k used, 24472544k free,  1056804k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND           
27898 slitt     20   0  383m 156m  300 R   93  4.8  10:24.38 sievesteve.bin     
16858 slitt     20   0  144m 7064 6504 R   89  0.2  11056:22 arecord            
 1048 slitt     20   0  291m  96m  32m R    2  3.0  73:09.40 konqueror          
 2552 slitt     20   0  193m  49m  25m R    2  1.5  30:58.15 nspluginviewer     
16205 slitt     20   0  273m 106m  30m S    2  3.3  28:50.97 konqueror          
23622 slitt     20   0  144m  33m  21m S    1  1.0 273:22.30 nspluginviewer     
17173 slitt     20   0  127m  28m  21m S    1  0.9  25:36.93 nspluginviewer     
26284 slitt     20   0  128m  33m  23m S    1  1.0   0:19.99 nspluginviewer     
23582 slitt     20   0  148m  53m  26m R    1  1.6   0:18.07 konqueror          


When I killed arecord and sievestev.bin, the temp plunged to 53 and 51C within 
30 seconds.

So John's CPU temps appear to vary much more with stress than do mine, always 
assuming my sieve of Erasthanes is as CPU stressful as his VirtualBox.

SteveT

Steve Litt
Recession Relief Package
http://www.recession-relief.US
Twitter: http://www.twitter.com/stevelitt