1) Message boards : Number crunching : Available work? (Message 27627)
Posted 4 Nov 2015 by Profile Tom95134
Post:
If you're running LHC on a system with other projects it's likely that you're missing them when they get rolled out. It happens to me all the time. Just to make sure nothing is "funny" I suggest you Suspend the other Projects on the system and just let LHC run for a week or so to see if any WU's show up. They don't get pushed very often and it's easy to miss getting a piece of the action if other Projects are eating up all the allocation.
2) Message boards : Number crunching : sorry if this has been already covered...GPU? (Message 27574)
Posted 22 Jul 2015 by Profile Tom95134
Post:
I process SETI@Home which makes both GPU and CPU Tasks available. The SETI GPU Tasks have been "sliced" into something that runs about 15 CPU Minutes on my GPU while their CPU Tasks run much longer (hours). I believe they have done this because BOINC wasn't able to manage the GPU and do Tasks switching. (Maybe this is still the case.) So, if you got a GPU Tasks that ran hours (Enigma@Home?) it would capture the GPU and hog the processor.

Somewhat of a misunderstanding there. Exactly the same SETI tasks are sent to CPUs and GPUs (a few special cases round the fringes) - there is certainly no "differential slicing".

If tasks take 15 minutes on GPU, but hours on CPU - then your GPU is faster. That much faster.

You can confirm this by checking validated tasks. It's possible to see workunits validated with one tack computed by a GPU, its 'wingmate' computed by a CPU.

There's also no problem with task switching with a GPU. The only weakness is that "leave applications in memory while suspended" can't be implemented on GPUs: there is no mechanism for temporarily paging GPU VRAM to hard disk. So GPU applications only make sense if the science applications have a viable checkpointing mechanism which can still be implemented for the parallel-processing GPU app. Provided that's in place - no problem. But task switching does create more of an overhead if the entire app, dataset, and checkpoint has to be reloaded at every switch. I lengthen the task switch interval on machines which might suffer from that - but in general (the exception being GPUGrid), GPU apps are so fast that they never even reach the default 1 hour TSI.


Thank you for the info. I had assumed that the CPU vs. GPU Tasks under SETI were different and targeted to one processor or the other.

My comment on Task switching was based from a number of years ago when I ran some Enigma@Home and SETI@Home GPU Tasks at the same time (switched). The Enigma Tasks would seize the GPU and then no SETI GPU Tasks would get switched in. So I guess I'll try doing some GPU work for Enigma again and see what happens.

Thanks again.
3) Message boards : Number crunching : sorry if this has been already covered...GPU? (Message 27571)
Posted 19 Jul 2015 by Profile Tom95134
Post:
Hi Filipe; I am awaiting a visit from my colleagues......
I'll try and remember to update you as soon as possible. Eric.


When Tasks become available for GPU processing what will be the trade-off between GPU and CPU Tasks?

I process SETI@Home which makes both GPU and CPU Tasks available. The SETI GPU Tasks have been "sliced" into something that runs about 15 CPU Minutes on my GPU while their CPU Tasks run much longer (hours). I believe they have done this because BOINC wasn't able to manage the GPU and do Tasks switching. (Maybe this is still the case.) So, if you got a GPU Tasks that ran hours (Enigma@Home?) it would capture the GPU and hog the processor.

Also, I have only one GPU in this system so for me it makes sense to do GPU work for only one Project. I suppose if your system(s) have a number of GPU installed then it makes sense but there is still the question of Tasks switching of GPU WU.

Will the GPU LHC@Home Tasks be "sliced" so that they play nicely with others or are we going to get GPU Tasks that run hours?

Tom
4) Message boards : Number crunching : Available work? (Message 27566)
Posted 11 Jul 2015 by Profile Tom95134
Post:
HERE! HERE!

Geez, folks. Get off Eric's back. It isn't like he sits up all night with a hammer and chisel making tiny rocks out of big ones. I remember not too many years ago before the LHC came on-line when there were no work units at all for many months at a stretch. WU will come when they come. Surely you all are working on other projects to pass the time.
5) Message boards : Number crunching : Available work? (Message 27562)
Posted 9 Jul 2015 by Profile Tom95134
Post:
New tasks?
Shed some light on us, we are starving


How can you be "starving" when you participate in 21 Projects. I'm doing work for 4 and I always have enough work to keep busy. Granted, it's not always LHC Tasks but I just keep crunching away.

LHC Tasks tend to be feast or famine. It's the nature of the work they are doing for the LHC.
6) Message boards : Cafe LHC : Build your own Lego LHC (Message 27556)
Posted 4 Jul 2015 by Profile Tom95134
Post:
Hope one of these is accessible. Please vote for production.
Have fun. Eric.

http://build-your-own-particle-detector.org/

https://cds.cern.ch/journal/CERNBulletin/2015/13/News%20Articles/2001046?ln=en

Where are the tiny flashing blue tracer LEDs?
7) Message boards : Number crunching : cannot get any workunits (Message 27500)
Posted 5 Jun 2015 by Profile Tom95134
Post:
Just because you see a few hundred WU available when you check Server Status doesn't mean that they exist. The numbers in Server Status are not updated in real time so you may get a No work available return when you try to pump the Server (do an Update).
8) Message boards : Number crunching : Host messing up tons of results (Message 27331)
Posted 8 Apr 2015 by Profile Tom95134
Post:
Eric,

I saw the following in your recent post...
"These training tasks in limited numbers could be deployed to willing users so I'm ready to sacrifice some of my machine time to make correlative results."


As you pointed out in our previous exchange of messages, my system doesn't appear to be throwing errors so I'm quite willing to point to a different location and get some "broken" tasks to crunch as a point of reference.

    Windows 7 Pro x64 SP1
    INTEL CORE i7-2600 3.4GHz
    16GB RAM
    NVIDIA GPU
    My network is Wi-Fi using Linksys WMP600N



I'll shut up now and let you get on with the work. :)

Thanks for the effort you are putting in.


Tom

9) Message boards : Number crunching : Available work? (Message 27263)
Posted 3 Apr 2015 by Profile Tom95134
Post:
Will it last over the Easter weekend?

I have a work machine that is now crunching away on SixTrack only, with all other Boinc projects suspended. It would be a shame if that machine sits idle over the weekend because the Sixtrack tasks run out.


You mean Passover?
10) Message boards : LHC@home Science : The Big Band Machine (Message 27241)
Posted 29 Mar 2015 by Profile Tom95134
Post:
He disappeared into a Higgs Boson. If you listen closely you can still hear his music.
11) Message boards : Number crunching : Available work? (Message 27236)
Posted 29 Mar 2015 by Profile Tom95134
Post:
WOW!!! 500+k Tasks waiting. I don't think I've ever seen that many in the queue.

Somebody at CERN must have found the "GO" switch.

I guess it's time to stop running in Lo-gear and get the system crunching 24x7 (Mea culpa PGE). No more overnight shutdowns for me and it's time to block new tasks for the other Projects I'm running too. (Although, when LHC has work the Project tends to get the lions share of the system. Yeah, I stumbled across how to tweak BOINC... I think.)
12) Message boards : Cafe LHC : Well, almost the truth (Message 27228)
Posted 26 Mar 2015 by Profile Tom95134
Post:
Enjoy...

The Truth About Black Holes, the Large Hadron Collider, and Finding Parallel Universes
13) Message boards : Number crunching : Available work? (Message 27175)
Posted 19 Feb 2015 by Profile Tom95134
Post:
I set LHC with a pretty high priority. That way, when stuff trickles through I usually get some of the tasks. And if there is a lot of work I'm kept pretty busy.
14) Message boards : LHC@home Science : The Big Band Machine (Message 27059)
Posted 15 Jan 2015 by Profile Tom95134
Post:
I posted an item on the vLHC message board about a program that NOVA/PBS carried on the LHC and Higgs. CLICK HERE

I don't think it was a rerun. In any case I found it very enjoyable watching.
15) Message boards : Cafe LHC : Atomic Apocalypse (movie) (Message 27006)
Posted 21 Nov 2014 by Profile Tom95134
Post:
Tonight in France, right now it fact, there's a movie called Atomic Apocalypse.
It's about a large particle collider creating a black hole and threatening the world.
...
Strange, I feel like I heard something like that before XD

Well after the series of "2012 Armageddon" based movies, nothing is surprising, everything will be used up to the core.

edit: wow, first part before ads cut ended, and it seems it's a serious case of people going berserk on misnaming and misdescribing something (though there's a collider involved, but that's the only thing they understood...maybe)


I guess we should all just wait for the know-nothing anti-science types here in the U.S. to see it and start spreading their usual sturm und drang about the evils of advanced science and the end of the world comming.
16) Message boards : News : Heavy I/O on Windows WUs (Message 27000)
Posted 18 Nov 2014 by Profile Tom95134
Post:
Eric,

FYI. The new version of BOINC (7.4.27) includes the ability to set which debug information is included in the BOINC Log. I haven't tried it but it looks like there are a number of settings that include disk info.

I just loaded 7.4.27 late this afternoon to see how it runs. vLHC and Enigma seem to be okay. Hopefully we'll have some more LHC work soon. SETI has gone quiet.

Tom
17) Message boards : News : Heavy I/O on Windows WUs (Message 26994)
Posted 15 Nov 2014 by Profile Tom95134
Post:
John,

I noticed the same slowdown when "w-" Tasks start to overwhelm the system. The approach I took was to use BOINC Manager Tasks to selectively suspend two or three of them which allows other Projects to run Tasks. I'll Resume these Suspended Tasks after a few hours and non-"w" Tasks are running on LHC.

Yeah, it's a pain to have to manually manage these things but it got me through the terrible "w"s.

Tom95134
18) Message boards : Number crunching : Where did all the work go? (Message 26991)
Posted 14 Nov 2014 by Profile Tom95134
Post:
I just looked at the Server Status and all the work in Tasks ready to send has "disappeared". Did it finally run out or has it been flushed until the heavy I/O issue has been resolved?
19) Message boards : News : Heavy I/O on Windows WUs (Message 26988)
Posted 14 Nov 2014 by Profile Tom95134
Post:
Here is a suggestion to try in an effort to eliminate or minimize the impact LHC has on other applications.

Note: This works with applications that the user starts when doing other work on the same computer. I have no way of testing whether it works with applications that start based on other demands.

Make use of the "exclusive applications" tab and insert those specific applications in the list.

Under BOINC Manager, click Tools then click Computing preferences and then select the "exclusive applications" tab. Click Add and then navigate to the application and add it to the list.


I just double checked that this function is still working (using Photoshop) and as far as I can tell, it is. All Projects indicate Suspended under the Tasks tab. I also checked VM (for those running vLHC or other Projects) and the status on those Tasks indicates "Paused"

The advantage of using the "exclusive applications" feature is that you never have to remember to Resume the Projects that you Suspended. They will automatically restart once all designated applications are closed.
20) Message boards : Number crunching : LHC on GPU ? (Message 26966)
Posted 8 Nov 2014 by Profile Tom95134
Post:
Does anyone know BOINC if suspends the GPU when you are running one of the exclusive applications on your system? At one time it didn't.

Back in the good old days (before retirement) I was often doing "business" work on a system where I was also running BOINC. When you are running things like Photoshop, Illustrator, Framemaker, etc. it is a real plus to be able to put these in the exclusive applications tab because BOINC suspends the Tasks so you have a "free" CPU. Admittedly, some CPU heavy applications do not have a heavy graphics requirement but others (as I mentioned) do, and poor graphics response is the pits.


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