Hello,

I have recently installed the new Ubuntu Distribution on a:

Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz

which runs:

Linux Ubuntu 2.6.24-19-generic (64bit).

On running the BOINC benchmark now I find:

Sat 02 Aug 2008 21:27:06 BST||Benchmark results:
Sat 02 Aug 2008 21:27:06 BST|| Number of CPUs: 4
Sat 02 Aug 2008 21:27:06 BST|| 1135 floating point MIPS (Whetstone) per CPU
Sat 02 Aug 2008 21:27:06 BST|| 4874 integer MIPS (Dhrystone) per CPU


Previously on a Debian Linux distribution I was seeing
Whetstone = 1800 per CPU
Dhrystone = 9400 per CPU

Any ideas about what could have happened or has the CPU burnt out or something equivalent. Any reason for the loss in performance. Whether the change in distribution is responsible I think it is unlikely.

Nevica

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You might like to review this old thread.

Modern Linux distros are - very comendably - concerned about not wasting energy when nothing important is going on.

Unfortunately, the science applications controlled by BOINC (such as SETI) run at the 'nothing important' level. So linux tries to save energy, and invokes the Intel 'Speedstep' or AMD 'CoolNquiet' technology as appropriate. Result: lower CPU speed and reduced crunching.

There are posts with appropriate commands to overcome this in the thread I linked.

Ubuntu is set to *on demand* power setting by default. This equates to it doesn't think you need to run a low priority task like boinc at more than 50%.
This link shows how to set the scaling to 100%.

Link


Good luck! This would be my best guess.

---

"The most exciting phrase to hear in science, the one that heralds new discoveries, is not Eureka! (I found it!) but rather, 'hmm... that's funny...'" -- Isaac Asimov

Any ideas about what could have happened or has the CPU burnt out or something equivalent. Any reason for the loss in performance. Whether the change in distribution is responsible I think it is unlikely.

Nevica

Looks like you're running 50% speed... the app reports...

Processor Information:
  Model: Intel Core 2 Quad Q6600, 1.20 GHz
  Package: 4 Cores

Good luck,
JDWhale