Are GPU work units dependent on the internet other than sending and/or receiving. The reason for this question is because our internet went out a three times over the last month and the workunits that were currently being processed continued on until completion and they were reported as client error/compute error. The last internet outage, I turned off the computer and restarted it after the outage and the work unit processed correctly. Are the workunits dependent on a good internet connection while being processed? I have lost 6 workunits due to this.

Um, no, and, um, well, yes ...

Which is confusing ... bear with me ...

There is no need for an internet connection to compute a GPU Grid task.

On the other hand, the TCP/IP connection used to connect the client to the manager can be farbled up if you lose your external connection. This is a long standing issue with the BOINC client that, because of its "intermittent" nature is difficult to locate.

*IF* you know you are losing, or will lose, or have lost your connection you have two choices to protect your work. One shut down the system or two, turn off BOINC's connection (Activity menu, suspend internet).

What killed your tasks were "No heartbeat" meaning the client and the science application lost "sight" of each other ... most specifically, the application thinks that the client is dead. It isn't really, it is just tied up trying to make a connection to the Internet. And it is locked up, so to speak, in the deadly embrace waiting for the connection to fail... but while it is doing that it is not paying any attention to anything else ...

{edit}
Like the running applications ... so they try to make the connection a specific number of times and if they fail that number of times, they quit ...

*SO* ...

Hope this helps ...

Thanks for that I was coincidentally having latency issues last night when Boinc lost connection to the client.

Isn't there a reference server/s that the system uses to check if the connection is good or not. Maybe it has something to do with losing site of that.

Rob

Thanks for the info, I'll shut down the internet connection next time and let the application continue to process.

I think the reference server it tries is google. I think i saw it somewhere but no idea where.

I think the reference server it tries is google. I think i saw it somewhere but no idea where.

Mhh, I also had occasional network failures but I didn't see the apps loosing connection to the BOINC client, even though I didn't suspend network activity (after all, there's always the chance the connection is restored and I won't have to run dry..).

So I'm wondering: is it really your external connection? Or some strange problem with your windows setup?

MrS

I don't think its a problem with the Windows setup. This is just a recent problem and it only happens when the internet in the area goes down. It has gone down three times in the last month and the two work units being processed at the time crashed and burned. The onlt problem I can think of ia a bug in BOINC Application 6.6.20 files (which was also installed about the time the problems started). I will revert back to a previous version and see what happens. I am also running the most current nvidia drivers for the video cards.

I don't think its a problem with the Windows setup. This is just a recent problem and it only happens when the internet in the area goes down. It has gone down three times in the last month and the two work units being processed at the time crashed and burned. The onlt problem I can think of ia a bug in BOINC Application 6.6.20 files (which was also installed about the time the problems started). I will revert back to a previous version and see what happens. I am also running the most current nvidia drivers for the video cards.

Except if you have different computers and / or you know the neighbours inet is also gone or you see the service guys working or whatever. I don't know your situation, so this was just an idea.. maybe a crazy one ;)

Well, I reverted back to BOINC 6.4.7 and everything has been running properly for the last two days. No problems to report at all. In my opinion there is a problem in the BOINC 6.6.20 code as it is applied to GPU/CUDA functions. BOINC 6.6.20 runs fine on my other computers, however they are not running GPU/CUDA functions.

Maybe I should have said "some problems' onstead of "a problem." Bad choice of words on my part. However, these problems have not manifested themselves on my computers that are not using CUDA.

There are two major problems with 6.6.20; neither of which is recognized by UCB as far as I know. One of them has been fixed in 6.6.23 and later, though 6.6.24 introduced a new issue, addressed in 6.6.25 (multi-GPU users only).

The two problems in 6.6.20 show as long running tasks on either CPU or GPU (I now have a confirmed instance of this relating to AP tasks of SaH), and secondly a gradual imbalance in internal debts that results in a very poor mix of work selection on the system.

Could the problem with long running tasks be only for those tasks that don't have fairly frequent checkpoints available yet?

Could the problem with long running tasks be only for those tasks that don't have fairly frequent checkpoints available yet?