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Old 2009-01-06, 12:02   #1
MatWur-S530113
 
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Apr 2007
Spessart/Germany

101000102 Posts
Default Problems running ECM on 2 workers

Hello,

I'm running 2 times the same batch with ECM curves on both workers like:
Code:
 
[Worker #1]
ECM2=1,2,2213,-1,44000000,4400000000,30,"53113,7967736971962111"
.
.
.
[Worker #2]
ECM2=1,2,2213,-1,44000000,4400000000,30,"53113,7967736971962111"
.
.
.
Yesterday I interrupted prime95 while running this curves to add more batches of work for the night. Worker#1 was at curve 28 when I stopped it, Worker#2 was at curve 29 (~5%). After restarting prime95 both workers began with curve 29 at 5% and the same sigma. I think both workers stored their data in the same file on the HD, overwriting the data of the first worker.
With prime95 v24.14 (atm I'm using v25.8b5) I never had this problem as it used 2 instances and 2 different folders on the HD. Curve 30 had different sigmas again for the both workers. Then prime95 reportet 2 times '30 curves done' to the server. Indeed curve 28 of Worker#1 was not calculatet and curve 29 was calculatet twice. This could be used for another kind of the 'cheesehead-bug': Interrupt Worker#1 at curve 1 and Worker#2 at curve 30. Restart both workers at curve 30 and report 2 times 30 curves done...
I don't know how to solve this problem. I will try to run ECM on different exponents, but it is a strength of ECM to be parallelizeable and sometimes it is needed.

best regards,

Matthias
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