Short Work Units

Message boards : Number crunching : Short Work Units
Message board moderation

To post messages, you must log in.

AuthorMessage
D. Gustibus

Send message
Joined: 3 Jan 04
Posts: 9
Credit: 242,311
RAC: 0
United States
Message 112836 - Posted: 19 May 2005, 14:35:08 UTC
Last modified: 19 May 2005, 14:36:24 UTC

For the past several weeks I've had increasing numbers of work units which complete in less than 1 minute. As I write this, I have 16 work units 'ready to report'; 7 of these units completed in less than a minute.

Not a problem... I'm just curious whether others are seeing this and why it is happening.
<img src="http://www.setisynergy.com/images/stats/comb-130.jpg"></img>


ID: 112836 · Report as offensive
Profile Captain Avatar
Volunteer tester
Avatar

Send message
Joined: 17 May 99
Posts: 15133
Credit: 529,088
RAC: 0
United States
Message 112837 - Posted: 19 May 2005, 14:39:30 UTC

You have two wu's on two different Machines...

The work Units were due in Semptember of 2004!

I think you missed the dealines....



ID: 112837 · Report as offensive
Kathy
Avatar

Send message
Joined: 5 Jan 03
Posts: 338
Credit: 27,877,436
RAC: 0
United States
Message 112839 - Posted: 19 May 2005, 14:43:31 UTC

Check the stderrout messages for those WU.
ID: 112839 · Report as offensive
Bill Barto

Send message
Joined: 28 Jun 99
Posts: 864
Credit: 58,712,313
RAC: 91
United States
Message 112879 - Posted: 19 May 2005, 17:45:23 UTC - in response to Message 112837.  

You have two wu's on two different Machines...

The work Units were due in Semptember of 2004!

I think you missed the dealines....



This answer does not relate to his question. Those are obviously some "lost" workunits that most of us that have been around since back then have on our computers and he is unable to delete those computers until they are gone.
ID: 112879 · Report as offensive
Profile Thierry Van Driessche
Volunteer tester
Avatar

Send message
Joined: 20 Aug 02
Posts: 3083
Credit: 150,096
RAC: 0
Belgium
Message 112920 - Posted: 19 May 2005, 19:48:27 UTC - in response to Message 112836.  
Last modified: 19 May 2005, 19:48:40 UTC

For the past several weeks I've had increasing numbers of work units which complete in less than 1 minute. As I write this, I have 16 work units 'ready to report'; 7 of these units completed in less than a minute.

Not a problem... I'm just curious whether others are seeing this and why it is happening.

These are WU's with the fameaous "SETI@Home Informational message -9 result_overflow" message.
When a WU is crunched and "The number of results detected exceeds the storage space allocated" you get this kind of short CPU time.
These are the so called noisy WU's which can contain for example radio signals from earth source. AFAIK S@H Classic would crunch them up to the end but S@H/Boinc stops crunching them at a certain time.
ID: 112920 · Report as offensive
D. Gustibus

Send message
Joined: 3 Jan 04
Posts: 9
Credit: 242,311
RAC: 0
United States
Message 113153 - Posted: 20 May 2005, 17:27:03 UTC - in response to Message 112920.  

These are the so called noisy WU's which can contain for example radio signals from earth source. AFAIK S@H Classic would crunch them up to the end but S@H/Boinc stops crunching them at a certain time.


That's the information I was looking for. Thanks.

<img src="http://www.setisynergy.com/images/stats/comb-130.jpg"></img>


ID: 113153 · Report as offensive
Profile Paul D. Buck
Volunteer tester

Send message
Joined: 19 Jul 00
Posts: 3898
Credit: 1,158,042
RAC: 0
United States
Message 113160 - Posted: 20 May 2005, 17:49:42 UTC - in response to Message 112920.  

S@H Classic would crunch them up to the end but S@H/Boinc stops crunching them at a certain time.

Classic did the same thing... that was one of the several ways people could manage to get higher WU counts ...

The dodges included (assuming you are interested)
1) WU Cloneing where partially processed WU were "shared" and completed on different machines and in some cases two people would share with each other also

2) Cherry selection, dropping WU with the "wrong" angle range and doing more of the "faster" work units, and trying to get more -9 types that could be processed faster

3) Returning the same WU multiple times

Countered by BOINC Assigning and tracking issued work so you cannot "share".
ID: 113160 · Report as offensive

Message boards : Number crunching : Short Work Units


 
©2024 University of California
 
SETI@home and Astropulse are funded by grants from the National Science Foundation, NASA, and donations from SETI@home volunteers. AstroPulse is funded in part by the NSF through grant AST-0307956.