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Corrupting WUs...

post #1 of 10
Thread Starter 
This is great fun.

86% completed, Quad has been slaving away through the night...

My other instance of f@h needs to go online and get a new job so i enable the wireless to let it...

Corrupts the job that was at 86%... F@H now informs that it is deleting the WU its been working so hard on.

Getting a bit tired of how easily work units corrupt.

From reading on the web it appears there is an issue with F@h and windows wireless where if the connection changes in some way it impacts on the mpiexec





When I was leaving the wireless on permanently the WUs would often hang hence why I leave it disabled until it needs it.
This is fine if running only one instance but I decided to move to 2.
post #2 of 10
Thread Starter 
http://folding.stanford.edu/English/FAQ-SMP#ntoc24


Q: When something happens to my network (changing settings or other tweaks), the FAH/SMP client has problems.

One issue with the SMP client is that the client uses MPI to handle multiple processors and MPI uses the network system (albeit on the local loopback device). If the network is tweaked during a run, this can cause problems for the loopback device, causing problems with MPI, causing Gromacs to stop processing. The same happens when a WIFI signal drops or goes out of range and comes back.

We are looking into this and in particular whether we can detect this well enough such that the client restarts from a checkpoint (best case scenario). For now, please don't change the network settings while FAH/SMP is running (you can always stop the FAH client, change the settings, and then restart the client later).

On some home routers, it has been found that DHCP lease renewals have caused the same issue as changing network settings. Setting a Static IP address instead will avoid that problem. And an Ethernet cable will help to avoid the problems of a WIFI connection. And these problems are less prevalent in Windows Vista and 2008, as the IP stack has several updates that Windows 2000 and XP do not.
post #3 of 10
Sorry to hear that Cog
post #4 of 10
Yeah that sucks

I feel your pain, just lost 2 units at 94% first units I've lost in a long time.
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Mighty-iTX
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post #5 of 10
I hope they sort it out... wireless is the future...
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post #6 of 10
Well, that explains my problems with WU's dropping, too...They seem to quit within the first 15% though :\\
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post #7 of 10
Thread Starter 
Vista apparently doesnt suffer from this problem.
post #8 of 10
Thanks the heavens for Vista (lol)!
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post #9 of 10
I never dropped a WU before, maybe its because I am wired.
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post #10 of 10
there is new client comin out check fah for fix
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