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Posts by Stuart

Posts by Stuart

1) Questions and Answers : Windows : Intel Visual Fortan run-time error (Message 46119)
Posted 29 Apr 2013 by Stuart
Post:
Hello,

Same error here, been cropping up over the last few weeks - had been aborting "bad" simulations but now its happening more often.

I dont appear able to copy and paste the error message and its alot to type!

Just aborted another task which was showing "computation error", task hadcm3n_3j00_1980_40_008352515

It was reported as having had 9h 55m 10s computation time which on my PC is around 2% completion.

Ive not really looked in detail to see when the others have failed in case there is a pattern.

Re-installed Boinc 7.0.64 for windows 64.

I run Windows 7 ultimate, 18Gb ram, i7 930 2.8Ghz which has been year long stable at 3.36GHz with an nVidia GTX 570 graphics card.

I only run the climate prediction and also GPU grid on boinc.

Hope this helps somebody fix things?

Stuart
2) Questions and Answers : Windows : hadcm3 only using 1 core (Message 45435)
Posted 10 Jan 2013 by Stuart
Post:
1 + 1 does equal 2.

But these calcs are for things such as sulphur pollutants, parts per million or less, and water vapour, a large % of the total. And lots of others.
The program, close to a million lines of floating point FORTRAN, needs time to get the correct data from the FPU.

Not to worry; if your models are statistically suspect, the researchers won't use them. Just like choosing fruit and veg at a shop: pick what looks good, and ignore what doesn't.

Been there, discussed this, many times.

******************

from your original post:
or allow the one instance to use all cores.

At least 2 projects used to run multi-core, but Acqua@home has ended.



Hi,

Thanks interesting, going to have a read up - id never considered over clocking as likely to affect a calculating.

I do alot of 3d graphics rendering, particle/fluid simulation in the likes of Adobe After effects, where effects packages run into Gb of programming, each frame may be 250MB in size. These things predict movement of billions of elements across thousands of frames so it may be similar in some respect to these models.

With this, i know, with the same settings applied, i will get the same result over and over again irrespective of the PC i run it on.

Anyway, i dont want to drag up a past subject, as i say - ive never considered it so i cant discuss it with any info with respect to boinc etc.

Thanks,
Stuart
3) Questions and Answers : Windows : hadcm3 only using 1 core (Message 45433)
Posted 10 Jan 2013 by Stuart
Post:
Hi, i see - ill enable the World Community grid stuff to pick up the slack resources. Room is cool without the CPU running at 100%

I dont think any of the boinc things run multicore, they just run multiple instances together. Even Adobe render things work the same way.

I had hoped to see 8 instances of the model running but perhaps not if that much work isnt available.

On the subject of the overclock, i would have assumed the calculation will be irrespective of CPU speed. If i do 1+1=2 at any speed ill always get the same answer. If there is an error due to the overclock, the system will lock. its a very stable overclock.

Also, the CPU clock speed would naturally fluctuate with energy savings where it downclocks at low load and it naturally overclocks a few cores with the Intel TurboBoost when the core loading is uneaven.

With that all in mind, id have assumed there should have been no effects on the instruction being executed.

Dave, i was just running the one task. Now back fully loaded with tasks from other projects.

4) Questions and Answers : Windows : hadcm3 only using 1 core (Message 45430)
Posted 10 Jan 2013 by Stuart
Post:
Hello, for along time ive ran Boinc with the World Community Grid and it had no problem using all 8 cores and lots of RAM.

Ive decided to move over to this after reading about the good work the hadcm3 model was doing.

I allowed all the World Community Grid computations to finish, however the Climate Prediction project is only ever running one instance using 12-13% of the CPU.

Everything is set to allow Climate Prediction to use 100% of the CPU 100% of the time and allowance of 80% of the 18Gb of RAM which i have.

The CPU is an i7 930 overclocked to 3.8Ghz and it used to chew through World Community Grid things very quickly.

Can anybody advise how to get another 7 instances of the hadcm3 engine to run, or allow the one instance to use all cores.

Thanks,
Stuart




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