climateprediction.net home page
can a task really take this long?

can a task really take this long?

Message boards : Cafe CPDN : can a task really take this long?
Message board moderation

To post messages, you must log in.

AuthorMessage
James Birkin

Send message
Joined: 14 Dec 06
Posts: 6
Credit: 766,196
RAC: 0
Message 25650 - Posted: 18 Dec 2006, 12:53:17 UTC

I have just started on CPDN and as far as I can see there are over 7000 hours to complete. As the experiment appears to have a report deadline next november surely my experiment is doomed not to finish?

Bit depressing that !

Hope I have misunderstood the information.


ID: 25650 · Report as offensive     Reply Quote
Profile MikeMarsUK
Volunteer moderator
Avatar

Send message
Joined: 13 Jan 06
Posts: 1498
Credit: 15,613,038
RAC: 0
Message 25651 - Posted: 18 Dec 2006, 14:18:45 UTC
Last modified: 18 Dec 2006, 14:20:45 UTC


The estimate is often very inaccurate. It\'s based on the Boinc benchmarks, and for some reason your benchmarks are very low, hence the estimate will be for a long time. The most accurate way to tell is to look at the \'s/ts\' (seconds per timestamp) figure displayed on the \'show graphics\' screen (press \'Z\' followed by \'8\'). Multiply the s/ts figure by 4.1 million to get the overall estimate.

As it happens, the \'deadline\' is ignored, so it doesn\'t matter how long it takes.

I'm a volunteer and my views are my own.
News and Announcements and FAQ
ID: 25651 · Report as offensive     Reply Quote
Profile old_user202885
Volunteer developer
Volunteer tester
Avatar

Send message
Joined: 16 Oct 06
Posts: 13
Credit: 8,437
RAC: 0
Message 25727 - Posted: 24 Dec 2006, 20:23:46 UTC - in response to Message 25650.  

your computer seems to be running a bit slow (8.9 seconds per timestep) considering it\'s a P4/3.2GHz (I have a P4/3.2GHz at home and it gets 2.1 seconds per timestep). I\'m not sure quite why it\'s so slow, but if it\'s running at 8.9 secs per timestep it could indeed take over a year to finish a complete 160 model-year run!
ID: 25727 · Report as offensive     Reply Quote
Profile geophi
Volunteer moderator

Send message
Joined: 7 Aug 04
Posts: 2167
Credit: 64,458,099
RAC: 2,895
Message 25729 - Posted: 25 Dec 2006, 5:14:42 UTC

Given the extremely low benchmarks, and the much higher s/TS than expected, I wonder if thermal throttling is occurring.
ID: 25729 · Report as offensive     Reply Quote
Ant B

Send message
Joined: 29 Mar 06
Posts: 8
Credit: 2,793,692
RAC: 0
Message 27350 - Posted: 15 Mar 2007, 22:45:33 UTC - in response to Message 25650.  

I have just started on CPDN and as far as I can see there are over 7000 hours to complete. As the experiment appears to have a report deadline next november surely my experiment is doomed not to finish?

Bit depressing that !

Hope I have misunderstood the information.



James,

There certainly seems to be something odd about your PC speed - it should be going a lot quicker. I see a few things which are of concern:
Your processor speed benchmarks (look on your computer page) are very slow and suggest your machine is running a quarter of its proper speed. These should show numbers which are equivalent to your processor speed, so 3200 integer speed (or maybe 1600x2, since you have a dual core processor). But definitely not 600. This may mean someone has set up your computer wrong in the first place (an upgrade perhaps?), or there was a heavy application running when the benchmark was run. The suggestion about overheating is valid, but I think unlikely. You may want to suspend the project and run the PC benchmark tests manually (advanced options - run CPU benchmarks) to see whether this is just anomalous reporting, or check your BIOS settings on the PC.
Secondly, I see you are not running the latest version of the software. The latest version is 5.8.11. I think I saw in one of your error messages that you are running 5.4.1. Perhaps an undate may help.
A couple of the error messages from crashed models seem to point to files getting corrupted. I have no clue what this means, except to wonder whether the shutdown sequence is not happening properly. Perhaps the update will help.

Look at your hardware settings to start with, see whether you can get the CPU benchmarks up to the proper amount, and see what happens.

Good luck.

Anthony
ID: 27350 · Report as offensive     Reply Quote
Profile old_user453018

Send message
Joined: 22 May 07
Posts: 5
Credit: 653
RAC: 0
Message 28924 - Posted: 23 May 2007, 14:47:12 UTC - in response to Message 27350.  

I am running a P4 3.0 gighertz system with 2 gig of ram. I do run 2 tasks at the same time (seti an CPDN) the CPDN esimate to completion is 2935 hours adverage. Is this normal? That would be like 122+ days.

It\'s well within the deadline.
ID: 28924 · Report as offensive     Reply Quote
Profile Pooh Bear 27
Avatar

Send message
Joined: 5 Feb 05
Posts: 465
Credit: 1,914,189
RAC: 0
Message 28931 - Posted: 23 May 2007, 19:15:36 UTC - in response to Message 28924.  

I am running a P4 3.0 gighertz system with 2 gig of ram. I do run 2 tasks at the same time (seti an CPDN) the CPDN esimate to completion is 2935 hours adverage. Is this normal? That would be like 122+ days.

It\'s well within the deadline.

Very normal. My P4 Xeon 2.8G HT does them in 132 days. This is shared with other projects, but hardly ever gets swapped out.


ID: 28931 · Report as offensive     Reply Quote

Message boards : Cafe CPDN : can a task really take this long?

©2024 climateprediction.net