Question about crunching with CPU and GPU

[OldChap]

David, it is fairly straightforward, what you need is an app_config file. EDIT: FOR APP_CONFIG YOU NEED TO RUN BOINC 7.0.42 OR LATER !! Select the one for your os on this page: http://boinc.berkeley.edu/download_all.php There are advantages to using 7.0.54 or later.

Users should be aware that due to the lack of driver support, namely open cl support, AMD 7xxx cards will not crunch using Windows XP.



Here is one that I use on a q6600. I have also used the same on 3770K

<app_config>
<app>
<name>hcc1</name>
<max_concurrent>16</max_concurrent>
<gpu_versions>
<gpu_usage>0.0625</gpu_usage>
<cpu_usage>0.25</cpu_usage>
</gpu_versions>
</app>

<app>
<name>beta</name>
<max_concurrent>16</max_concurrent>
<gpu_versions>
<gpu_usage>0.0625</gpu_usage>
<cpu_usage>0.25</cpu_usage>
</gpu_versions>
</app>

</app_config>

copy this into notepad then save it in the following folder: program data> Boinc> projects> www.worldcommunitygrid.org ensuring you select the "all files" option in the "save as type" box. Name the file app_config.xml

Unless you changed it already files and folders like this are hidden. Unhide them to get this done: (in search box type folder options and select that from results> you will see this



As in the highlighted area select show hidden files and folders)

When you stop and re-start boinc this should then start working on 16 wu's running concurrently on your graphics card but your rig may have a number of other projects waiting to run. Go to your my grid page and change your profile to stop cpu work then abort any cpu tasks you may have in cache.

To get the best out of your rig it is necessary to spend some time separating in time the concurrent wu's so that they are all at a different stage of completion at any one time. May I suggest a figure of around 50 seconds to start with until you get a feel for how your rig is performing. It is the figure I use on a CPU @ 3.3, Gpu @ 1300 Rig. (If you run an overclocked 3770K or 2600K make this 40 seconds) Unfortunately this is not an exact science and you may find that, over time, the wu's tend to group together. If you are one that wants absolute best performance it is necessary to re-allign regularly (daily) or after you use graphics for anything else like watching vids

You may want to experiment with how many wu's to run concurrently so here is a little insight as to what each figure in the config file is doing

<app>
<name>hcc1</name>
<max_concurrent>16</max_concurrent>This is the total number of hcc1 wu's running at any one time on your RIG
<gpu_versions>
<gpu_usage>0.0625</gpu_usage>This is 1 divided by the number of wu's you wish to run on a CARD
<cpu_usage>0.25</cpu_usage>This is the number of cores/threads on your cpu that you wish to give to the GPU work divided by the number of GPU wu's you wish to run concurrently on the RIG
</gpu_versions>
</app>


Feel free to ask any question if I have been unclear on something