Search found 13 matches

by yalexey
Sun Jan 08, 2017 3:53 pm
Forum: FAH Hardware
Topic: PCI-e bandwidth/capacity limitations
Replies: 257
Views: 93095

Re: PCI-e bandwidth/capacity limitations

Recent data in that the thread suggest - the performance is much stronger influence by latency, rather than the bus width. That is why I want to repeat the question: Is it possible to eliminate this bottleneck, by reducing latency requirements? For example, by the GPU job queue formed CPU cycles or ...
by yalexey
Thu Dec 29, 2016 9:18 pm
Forum: FAH Hardware
Topic: PCI-e bandwidth/capacity limitations
Replies: 257
Views: 93095

Re: PCI-e bandwidth/capacity limitations

Is it possible to organize some kind of queue in OpenCL, and preload data? Perhaps due to the processing of two or more threads on a single GPU. Cost of multigpu system essentially depends on the required bus bandwidth. The other day I saw the description and photo 12 Radeon GPU system on a single S...
by yalexey
Sun Dec 18, 2016 11:00 am
Forum: FAH Hardware
Topic: Advise on new machine
Replies: 28
Views: 7261

Re: BIOS Update

Upgrading the motherboard BIOS, usually does nothing, and it is not necessary if the manufacturer's website as indicated for your case. Regarding the graphics card firmware is different case. The update can significantly improve operation of the device. But the video card manufacturer's website is a...
by yalexey
Fri Dec 16, 2016 4:03 am
Forum: FAH Hardware
Topic: PCI-e bandwidth/capacity limitations
Replies: 257
Views: 93095

Re: PCI-e bandwidth/capacity limitations

Xeon E5-2609 v4 has only 40 PCIe lines. If there is no PCIe switch on this motherboard, the video cards have at most eight PCIe lines each. Bus load is typical for such number of lines.
by yalexey
Mon Dec 05, 2016 9:00 pm
Forum: FAH Hardware
Topic: MultiGPU problem
Replies: 5
Views: 1204

Re: MultiGPU problem

Yes. It is V7.4.15 client. 14:51:48:************************* Folding@home Client ************************* 14:51:48: Website: http://folding.stanford.edu/ 14:51:48: Copyright: (c) 2009-2016 Stanford University 14:51:48: Author: Joseph Coffland <joseph@cauldrondevelopment.com> 14:51:48: Args: 14:51:...
by yalexey
Mon Dec 05, 2016 7:55 pm
Forum: FAH Hardware
Topic: MultiGPU problem
Replies: 5
Views: 1204

MultiGPU problem

Almost every reboot, I see in the log messages, such as: 14:51:48:ERROR:FS01:OpenCL device not found for 'opencl-index' = 3 with vendor ID = 0x10de, plese correct this by removing the manually configured 'opencl-index' option. 14:51:48:ERROR:FS03:'opencl-index'=2 is in use by another folding slot bu...
by yalexey
Mon Dec 05, 2016 7:39 pm
Forum: Problems with NVidia drivers
Topic: WARNING Do not upgrade to 375/376.xx drivers (for xx<48)
Replies: 311
Views: 179620

Re: WARNING ! Do not upgrade to 375/376.xx drivers.

Charmingly. They have favourite bugs. I do not think they will be easy to part with it.
by yalexey
Fri Nov 18, 2016 5:54 pm
Forum: FAH Hardware
Topic: PCI-e bandwidth/capacity limitations
Replies: 257
Views: 93095

Re: PCI-e bandwidth/capacity limitations

Two PSU 500-600 watt power is also cheaper than the one on the 1000-1200 watts. Two casess, if need any, less expensive than ordering a special frame for the graphics cards on raisers. And it cheaper than 4 liquid-cooled graphics card, plus an external heat sink. We can talk about a slight increase ...
by yalexey
Thu Nov 17, 2016 10:06 pm
Forum: FAH Hardware
Topic: PCI-e bandwidth/capacity limitations
Replies: 257
Views: 93095

Re: PCI-e bandwidth/capacity limitations

According to my calculations, the cost of a new motherboard with four full-fledged PCIe x16 slots and powerful processor will exceed the cost of two budget motherboards with two PCIe x16 slots each and two cheap dual-core processors. Boards with two cards do not require a special risers and housing....
by yalexey
Wed Nov 16, 2016 5:31 pm
Forum: Issues with a specific server
Topic: 171.67.108.105 / 46
Replies: 13
Views: 4231

Re: 171.67.108.105 / 46

I have a problems with the same subnet now. One WU able to upload more than a day. The other two were downloaded for 10-20 minutes. The card is idle.

This was before too. I think, I will just deny connections to server in this network. On the other servers I do not have such problems.
by yalexey
Fri Nov 11, 2016 6:10 am
Forum: FAH Hardware
Topic: PCI-e bandwidth/capacity limitations
Replies: 257
Views: 93095

Re: PCI-e bandwidth/capacity limitations

x4 slot slowing too. According to FAHBench results 2-10%. Using real results of the calculations are not correct for compare. Depending on the cores and different workunits performance can float by +-10% or more. In addition, PPD affected by state of the network, servers load, and a lot of other fac...
by yalexey
Wed Nov 02, 2016 12:52 pm
Forum: FAH Hardware
Topic: PCI-e bandwidth/capacity limitations
Replies: 257
Views: 93095

Re: PCI-e bandwidth/capacity limitations

FAHbench show significant performance loss if I connect one GTX 1070 card to PCIe 3.0 x1 slot. Depending on test pattern - 9%-47% low performance. And 75-85% bus controller load on this card.
Something similar occurs in the processing of real jobs by core 21.

Win 10. Asrok B150 motherboard.
by yalexey
Sun Oct 30, 2016 5:28 pm
Forum: Problems with NVidia drivers
Topic: WARNING Do not upgrade to 375/376.xx drivers (for xx<48)
Replies: 311
Views: 179620

Re: WARNING ! Do not upgrade to 375.xx drivers.

Security problems and potential vulnerability drivers are relevant for those who, for some reason, launches a lot of untrusted downloaded from the network code on their machine.
If so, then updates are needed.

But this is specific type of activities.