Posts by MarkJ


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1) Message boards : Number crunching : crossfire or sli? (Message 1572631)
Posted 4 days ago by Profile MarkJProject donor
I believe CUDA 6 adds support for using cards in SLI mode (ie treating them as a single larger GPU). It may take some coding and I don't think anyone has produced a CUDA 6 Multi Beam app (yet). Jason would probably be the person to ask.

XT Libraries: Automatic Scaling to Multiple GPUs

CUDA 6 introduces XT Library interfaces which provide automatic scaling of cuBLAS level 3 and 2D/3D cuFFT routines to 2 or more GPUs. This means that if you have one or more dual-GPU accelerator cards in your workstation or cluster node, you can automatically take advantage of them for intensive FFTs and matrix-matrix multiplication. cuBLAS XT also enables multiplication of matrices that are too large to fit in the memory of a single GPU, because it operates directly on matrices allocated in CPU memory, tiling the matrix and overlapping computation with memory transfers. The result is linear scaling of very large GEMM operations to multiple GPUs, as the following figure shows.
2) Message boards : Number crunching : Fundraising time again...... (Message 1562981)
Posted 24 days ago by Profile MarkJProject donor
Thank you for your gift of $150.00 via Visa on 08/27/2014. Your gift will benefit the following area:

SETI@home - $150.00

Your confirmation number is: 136478
3) Message boards : Number crunching : ASIC computers (Message 1540667)
Posted 69 days ago by Profile MarkJProject donor
There was also this message thread.
4) Message boards : Number crunching : 120mm fans with ~ 59CFM / 100m3/h (installed) (Message 1496981)
Posted 175 days ago by Profile MarkJProject donor
I've replaced most of my failed ones with Noctua. They cost a bit more but they are quiet and more importantly reliable.

I had some Corsair ones that came with a H80 kit and they sound like a jet engine taking off.

Got some Fractal design ones (came with their case) and had them fail after about 12 months, replaced them with Noctua.

Also had some CoolerMaster ones that died. Totally seized up on a CPU cooler, ended up replacing them with Noctuas.

Have yet to have a Noctua fail and some of mine have been going for 3 years.
5) Message boards : Number crunching : app_config question (Message 1491778)
Posted 184 days ago by Profile MarkJProject donor
The lunatics apps all read command files, so no need to do it in app_config. You'd edit the txt files for each app, if you wanted to pass a value to the GPU app you'd put it into the txt file and leave the CPU version of the txt file blank.
6) Message boards : Number crunching : The (Preliminary and Premature) Green Bank SERENDIP Fundraiser - Help SETI@Home Build a New (non-Arecibo) Receiver! (Message 1491760)
Posted 184 days ago by Profile MarkJProject donor
Your order is complete! Your order number is 1330.

$490 so it should be down to $4000 left now, except gpuug.org isn't updating the amount
7) Message boards : Number crunching : CPU tasks run slow after upgrade to 7.2.42 (Message 1491084)
Posted 185 days ago by Profile MarkJProject donor
Are you sure it's not throttling? There are settings to do with suspending work when CPU usage exceeds a percentage. Have you checked these? Given BOINC itself doesn't do any crunching it sounds like it may be suspending and unsuspending. Messages should be in your BOINC event log if it is.
8) Message boards : Number crunching : Set of new CPU AstroPulse builds (Message 1477586)
Posted 217 days ago by Profile MarkJProject donor
Can someone explain the file names. The version number, SSE, etc I get, but what are the no_opt and the noarch? I am guessing no_opt means no optimisations.

Also was there an all_opt for x64? It looks like the only x64 was a vanilla version. Does avx yield anything?
9) Message boards : Number crunching : Will BOINC/ SETI run on a Beowulf Cluster ? (Message 1470199)
Posted 234 days ago by Profile MarkJProject donor
I haven't tried it myself but I believe there are hooks to use BOINC as a fill-in process under a condor cluster. BOINC itself doesn't support MPI that most clusters use to communicate with worker nodes in the cluster. Jason is/was looking to doing something in this area (superdreadnought).

You could install BOINC on each and use BOINCtasks to monitor them however for OS and other software updates etc you'd probably have to SSH into each one which is what I do with my bramble every so often.
10) Message boards : Number crunching : Stop network activity specific days? (Message 1459992)
Posted 261 days ago by Profile MarkJProject donor
You could set up a command script to use BOINCCMD (the command line tool for BOINC) to enable and disable network activity, so you'd have 2 scripts. Then use Task Scheduler if using Windows (or cron if Linux) to run it as desired.

Doco for BOINCCMD can be found here

Enable script
Cd "\Program Files\boinc"
BOINCCMD --set_network_mode always

Disable script
Cd "\Program Files\boinc"
BOINCCMD --set_network_mode never
11) Message boards : News : Our Winter 2013 fundraising drive is underway. (Message 1459452)
Posted 262 days ago by Profile MarkJProject donor
Thank you for your gift of $200.00 via Visa on 12/31/2013.
Your gift will benefit the following area:

SETI@home - $200.00

Your confirmation number is: 128828
12) Message boards : Number crunching : BONIC on RK3188 running PicUntu (Message 1446973)
Posted 298 days ago by Profile MarkJProject donor
They (the Pis) are classed as ARM hard float.

Actually its: arm-unknown-linux-gnueabihf
13) Message boards : Number crunching : BONIC on RK3188 running PicUntu (Message 1446957)
Posted 298 days ago by Profile MarkJProject donor
There is a Multibeam v7 app for the Raspberry Pi available at Burdeview by Daniel Carrion. They (the Pis) are classed as ARM hard float.

The bad news is you have to use anon platform until Eric can add it as a standard app. Daniel has an app_info in the zip file and instructions on his blog.
14) Message boards : Number crunching : New BOINC version (Message 1441369)
Posted 312 days ago by Profile MarkJProject donor
New BOINC version with Virtualbox.

What is this?

Tim

There are two flavours you can download. One with virtualbox and one without. You can also download virtualbox on its own from the oracle site. You only need virtualbox if you are going to run a project that uses it such as Test4Theory. If you don't want to run one of the virtualbox projects then it's best to get the version without.

The virtualbox version bundled with BOINC is already (slightly) out of date which is one reason you might want to get it directly from oracle.
15) Message boards : Number crunching : Boinc Deletes SETI? (Message 1415007)
Posted 372 days ago by Profile MarkJProject donor
You aren't using an account manager (grid republic or bam) are you?
16) Message boards : Number crunching : Lunatics - Should I be using a different MB GPU app? (Message 1410734)
Posted 383 days ago by Profile MarkJProject donor
One other thing you might find is leaving a CPU core free to feed the GPU. OpenCL apps seem to benefit greatly from this. Just set the "use % processors" to some value less than 100 (eg 87.5% for your i7-2600 machine).

Also check your driver version. It says unknown which might just be BOINC doesn't know, but maybe the driver isn't the best one for your card.
17) Message boards : Number crunching : 2013 Fundraiser (Message 1403064)
Posted 402 days ago by Profile MarkJProject donor
And here's a donation from me

Thank you for your gift of $250.00 via Visa on 08/14/2013.
Your gift will benefit the following area:

SETI@home - $250.00

Your confirmation number is: 116355
18) Message boards : Number crunching : SETI ASIC Chips (Message 1387994)
Posted 442 days ago by Profile MarkJProject donor

Sure it will work. We already can use the Raspberry Pi.


I have a RasPi (actually 2). From the first batch even. I was of course curious about crunching with the Pi. I installed the software, pretty straight forward.

Fact is that with MB V6 my RAC stabilised at about 14. I do not know if the software has been upgraded to V7, but it would for sure not top higher than 7 (no pun intended... or yes? ;-) ).
So, it is fun, but actually of very little use even for the not die hard credit seekers.

Happy crunching!

Sleepy


See Daniel Carrions blog here for various Raspberry Pi apps including multi-beam v7. Yes they are rather slow but at $35 each you can have a few of them.
19) Message boards : Number crunching : SETI ASIC Chips (Message 1387576)
Posted 443 days ago by Profile MarkJProject donor
When I first brought up the possibility of ASIC chips, I was not so interested in speed as I was cost of ownership vs. number crunching. If we look at the price of a pc with all of its hardware to crunch and then add more and more expensive hardware to crunch then to some, it becomes cost ineffective to crunch. Not to mention the price of electricity a pc and it's associated hardware uses.

If we have chips that are low power and low cost, then we could build crunching rigs as we go. If I was not sending less on electricity, then I could add some more chips to a rig as I went. It would increase the crunching.

Now, I know about the Parallella, so do you think something like it could work?


Sure it will work. We already can use the Raspberry Pi. The Parallella is a dual core ARM A9 so it's like two Pi's. The unknown is how well the Epiphany chip will run a SETI OpenCL app.
20) Message boards : Number crunching : SETI ASIC Chips (Message 1386625)
Posted 445 days ago by Profile MarkJProject donor
<edit> Here's another interesting link which came up in the google search. Looks like somebody has been playing around with idea.


That's the one I mentioned before only I didn't link to it. Could have been interesting if they got it to work.

I am awaiting the Parallella to see how they go, although the small number of cores will presumably be one of its limitations (when compared with a GPGPU).


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