1) Message boards : Server and website : Server needs topping up (Message 40745)
Posted 22 days ago by Profile skgiven
As well as SETI and Einstein,
POEM has an opencl_nvidia_101 app and MilkyWay has Open_CL apps for NVidia cards.

I've emailed Gianni, Matt and the group just in case they didn't know.
2) Message boards : Number crunching : Dear Gerard (Message 40726)
Posted 26 days ago by Profile skgiven
Last time I checked doing both was only slightly more advantageous (2 or 3%) than just freeing up a CPU core/thread (or two), but if you are just missing a deadline then it might help. Freeing up a thread or two could help more, but once you've done that you might as well use SWAN too.
The benefits of SWAN_SYNC could depend on the task type and your system (CPU performance and GPU). Unfortunately there are so many task types around now it could take weeks to get enough results to present accurate measurements.
3) Message boards : Number crunching : Dear Gerard (Message 40724)
Posted 26 days ago by Profile skgiven
For SWAN_SYNC to work you need to restart the computer, after you create it. You also need to specify in Boinc Manager to leave at least 1 CPU core/thread free to benefit, but leaving more than one free improves things even more. On a 4core/8thread system there is usually no benefit in using less than 50% of the CPU (4threads) and not much difference between using 4 and 5 threads. I normally only use between 5 and 7 threads 62.5% to 87.5% of the CPU.
4) Message boards : Frequently Asked Questions (FAQ) : Not getting new work! (Message 40715)
Posted 27 days ago by Profile skgiven
That's a CUDA 6.0 driver, but it should suffice for now.
5) Message boards : Number crunching : Dear Gerard (Message 40714)
Posted 27 days ago by Profile skgiven
SWAN_SYNC is an environmental variable.
Basically, it will force the task to use a full CPU core/thread.

Last I heard is that on Linux you need to use SWAN_SYNC=1

https://www.gpugrid.net/forum_thread.php?id=3890&nowrap=true#38355

Try some searches for SWAN_SYNC + Linux.
6) Message boards : Number crunching : Dear Gerard (Message 40708)
Posted 27 days ago by Profile skgiven
It's called Linux.
Other things that can expedite the process are not using the CPU for CPU work, using SWAN_SYNC, slightly overclocking, setting higher process priority, affinity and using process lasso might also help, as might using an iGPU for the display.
7) Message boards : Frequently Asked Questions (FAQ) : Not getting new work! (Message 40707)
Posted 27 days ago by Profile skgiven
If the drivers installed properly Boinc may be starting before the drivers are ready. Add a delay or restart boinc from a terminal.

HOW TO - Add a Boinc Start Delay in Ubuntu
8) Message boards : Graphics cards (GPUs) : Select GPU for F@H (Message 40706)
Posted 27 days ago by Profile skgiven
On Boinc Manager 7.4.42 it's Tools, Computing Preferences (not options), exclusive applications.
9) Message boards : Graphics cards (GPUs) : Select GPU for F@H (Message 40688)
Posted 28 days ago by Profile skgiven
How can i run 2 GPUs (Not SLI mode) in BOINC ?
GOT a GTX460, GT630 :)

Install them and add the 'use all gpu's' instruction in a cc_config.xml file,
http://boinc.berkeley.edu/wiki/Client_configuration

When i make here any suggestions will it be added to BOINC Manager ?
No. Berkeley maintain and publish the Boinc software,
http://boinc.berkeley.edu/
10) Message boards : Graphics cards (GPUs) : Big Maxwell GM2*0 (Message 40687)
Posted 28 days ago by Profile skgiven
Over the last couple of years the performance variation between task types has increased significantly. This has made it awkward to compare cards of different generation/even sub-generation. Task performances vary significantly because different tasks challenge the GPU in different ways, even exposing the limitations of more subtle design differences.

While DooKey's 5820K system (with the Titan X) may be using lots of CPU, it's a 6 cores/12 thread system, and while he has a high rac at Universe@home (a CPU project), he does not have that system hooked up there,
http://boincstats.com/signature/-1/user/21224/sig.png
http://boincstats.com/en/stats/-1/user/detail/21224/projectList
http://universeathome.pl/universe/hosts_user.php?userid=2059

The CPU could be dropping into a lower power state, he could be gaming or playing with the setup/config:

3855MHz GDDR seems like a heavy OC for 3500MHz/7GHz memory.
While SKHynix have 4GB memory chips rated at 8GHz, I don't think the Titan X uses them?

Several errors here,
https://www.gpugrid.net/results.php?hostid=196801
and looking at some of the tasks, there are a lot of recoveries, before the failures,
https://www.gpugrid.net/result.php?resultid=14040943

The WDDM overhead could well be greater with the bigger cards and it might not be a constant, it could vary itself by task type (atom count/CPU demand). Last time we had a look there did seem to be some variation with GPU performance.

A significant overall performance gain might come by running more than one WU, as with the GTX970 and GTX980 on W7, Vista, W8 & W10 preview (WDDM2.0). Perhaps 3 WU's on a Titan X, would be optimal?


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