Welcome to MilkyWay@home

Posts by robertmiles

1) Message boards : News : New Poll Regarding GPU Application of N-Body (Message 71035)
Posted 28 Jul 2021 by robertmiles
Post:
Nvidia provides a CUDA sample that looks closely related to the N-body problem.

On my computer, it is in directory:

C:\ProgramData\NVIDIA Corporation\CUDA Samples\v11.4\5_Simulations

Its name is nbody.

Have you checked if it contains anything useful for the N-body problem?

I've seen no sign that programs partly in CUDA and partly in OpenCL are supported.

I've found a program named swan that is supposed to translate CUDA into OpenCL. However, it hasn't been updated in over 10 years, so I haven't put much effort into checking further.

dnzykbrzxk-1

I'm trying to devote my GPU to BOINC projects related to medical research. However, few enough such tasks are available that I'm also getting the shorter GPU tasks from other BOINC projects to avoid changes in the speed of my computer fans at night.

Folding@Home doesn't use BOINC, or it would be a suitable choice.

I don't consider whether you offer GPU N-body tasks to be important for me. However, I'll consider running them if I like their running times.

Is the GPU N-body program in the sane computer language as the CPU version? If so, you may be able to simply copy the code for the unimplemented features from the CPU version to the GPU version.
2) Message boards : MilkyWay@home Science : How do you consider this article with your science project (Message 69548)
Posted 19 Feb 2020 by robertmiles
Post:
Large number of dwarf galaxies discovered in the early universe

https://astronomynow.com/2016/11/25/large-number-of-dwarf-galaxies-discovered-in-the-early-universe/
3) Message boards : MilkyWay@home Science : Piece of Mind for question (Message 69547)
Posted 19 Feb 2020 by robertmiles
Post:
[snip]

One project, now closed, was to crack an encryption code. Don't remember exactly but when I looked into it there was a monetary reward. I asked who would get the reward but never not an answer.

[snip]

Did that project happen to be Enigma@Home?

http://www.enigmaathome.net/

They may still be trying to crack the encryption of three messages sent to the German navy during World War II.
4) Message boards : Number crunching : Computation errors (Message 68931)
Posted 27 Jul 2019 by robertmiles
Post:
2 computation errors for me just now.

The following error message suggests that both were due to bad input files:

Error loading Lua script 'astronomy_parameters.txt': [string "number_parameters: 4..."]:1: '<name>' expected near '4'
5) Message boards : Number crunching : A Windows 10 update that blocks OpenCL use (Message 65228)
Posted 21 Sep 2016 by robertmiles
Post:
Solution found if you have GEFORCE Experience installed - start it. Either tell it to install a newer driver, or click on the three dots to the right of the message telling you which driver you have installed, and tell it to reinstall the driver.

This tells it to install the Nvidia version of the driver, with the OpenCL interface, instead of the Microsoft version, which usually does not have the OpenCL interface.
6) Message boards : Number crunching : A Windows 10 update that blocks OpenCL use (Message 65227)
Posted 21 Sep 2016 by robertmiles
Post:
WARNING - the latest round of 64-bit Windows 10 updates appears to have blocked BOINC from finding the OpenCL interface to my GT 440. The CUDA interface does not seem to be affected.
7) Message boards : Number crunching : Many failed GPU workunits in a row (Message 64530)
Posted 3 May 2016 by robertmiles
Post:
The 365.10 driver is now available, but it does not fix this problem.
8) Message boards : Number crunching : Many failed GPU workunits in a row (Message 64476)
Posted 17 Apr 2016 by robertmiles
Post:
The OpenCL section of the Nvidia 364.72 driver, and earlier 364.* drivers, has a problem which can an entire computer to lock up, or cause a few dozen OpenCL tasks (often not all from the same BOINC project) to give a quick Compute Error. Problem not seen in the 362.00 driver.

Tasks from POEM@home seem the most likely to trigger this problem.

Threads on the problems:

https://www.primegrid.com/forum_thread.php?id=6769#94223

http://boinc.fzk.de/poem/forum_thread.php?id=1205#10896
9) Message boards : Number crunching : Many failed GPU workunits in a row (Message 64475)
Posted 16 Apr 2016 by robertmiles
Post:
Several GPU workunits in a row failed, at least two dozen from various BOINC projects.

MilkyWay@Home v1.02 (opencl_nvidia):
http://milkyway.cs.rpi.edu/milkyway/result.php?resultid=1559971920
http://milkyway.cs.rpi.edu/milkyway/result.php?resultid=1559971926
http://milkyway.cs.rpi.edu/milkyway/result.php?resultid=1559971928

Milkyway@Home Separation (Modified Fit) v1.36 (opencl_nvidia_101):
http://milkyway.cs.rpi.edu/milkyway/result.php?resultid=1559971742
http://milkyway.cs.rpi.edu/milkyway/result.php?resultid=1559971744
http://milkyway.cs.rpi.edu/milkyway/result.php?resultid=1559971749
milkyway.cs.rpi.edu/milkyway/result.php?resultid=1559971751
http://milkyway.cs.rpi.edu/milkyway/result.php?resultid=1559971753

Part of a large cluster of GPU workunits from various BOINC projects that failed about the same time, so at least one of them did not leave BOINC and the driver in a state where another GPU workunit would start properly.
10) Message boards : Number crunching : New Benchmark Thread - times wanted for any hardware, CPU or GPU, old or new! (Message 64427)
Posted 27 Mar 2016 by robertmiles
Post:
I have a few Nvidia-based graphics boards that aren't on your list yet.

This thread is rather long to search through for restrictions on what else can be running on the computer during these tests, so could one of you summarize them?
11) Message boards : Number crunching : Problems with latest Windows 10 update (Message 64217)
Posted 2 Jan 2016 by robertmiles
Post:
Something that might help other people look for a cause:

In BOINC Manager, click on Tools, then Event Log. Scroll up to the top of the log. If the first message begins with Starting BOINC, select that line, then scroll down until you see the first line with a project name in the Project column, then hold down the Shift key while clicking on the last line before the one with the project name. Click on Copy selected. Then paste what this copied into your next message here.

If the fist message does not begin with Starting BOINC, click on Activity, then Suspend, then File, then Exit BOINC. Once this shuts BOINC down, restart it and try the above again.

Then click on Activity, then Run based on preferences.
12) Message boards : Number crunching : Problems with latest Windows 10 update (Message 64215)
Posted 2 Jan 2016 by robertmiles
Post:
Try this:

Go to the website:

http://milkyway.cs.rpi.edu/milkyway/

Click on the blue Your account link.

Click on the blue View link in the Tasks line.

Choose one of the tasks and click on the Task number in the left column.

Scroll down until you see the Stderr output section.

The most important information is probably near the bottom of this section, starting with the first error message.

The stderr lines you quoted suggest that people with access to the application's source code may be the only ones who can use these lines, since some output files from a special compile are needed to tell what is being done at the address of the failure.

I looked at the stderr file for one of your tasks. What I saw indicates that one of the input files is messed up, probably one that is being saved from one workunit to the next, and probably an XML file. Therefore, something else to try is to go to the Projects window of BOINC Manager, click on Milkyway@Home, then click on Reset project in the Commands column. This should make your computer download the files again, and hopefully correct any problems with the input files.
13) Message boards : Number crunching : Problems with latest Windows 10 update (Message 64213)
Posted 2 Jan 2016 by robertmiles
Post:
I've seen one BOINC project that requires you to install an AMD SDK. Here is the latest version:

APP SDK – A Complete Development Platform
http://developer.amd.com/tools-and-sdks/opencl-zone/amd-accelerated-parallel-processing-app-sdk/

No need to do anything with it except leave it installed.

Also, do you know how to find the log file of a workunit after it has been reported back to a BOINC project? If you can find it, but cannot tell what it means, copying it to this forum would allow other users to look at it also.

You might check if you have the latest driver available for that graphics card.

Download AMD Radeon Software (drivers for Radeon, FirePro, APU, desktops, laptops)

http://support.amd.com/en-us/download

Some of their driver installations work better if you tell them to uninstall the old driver first.
14) Message boards : Number crunching : Problems with latest Windows 10 update (Message 64207)
Posted 1 Jan 2016 by robertmiles
Post:
I am having a different problem after switching to Windows 10 and BOINC 7.6.22 BOINC manager shows my WUs completing in just a few seconds and all erroring out. I've made no other changes. Anyone have any ideas what I need to do?


Some BOINC projects now require you to download and install the latest runtime package for C++ in order to run under Windows 10; this does NOT happen automatically.

I've lost the information on where to find this package, though.
15) Message boards : Number crunching : Problems with latest Windows 10 update (Message 64158)
Posted 6 Dec 2015 by robertmiles
Post:
The latest Windows 10 update causes some problems affecting BOINC users.

First, it disables OpenCL use, at least for my GT 440. Installing the Nvidia version of the most recent graphics driver enables it again, though.

Second, it installs Skype. The last time I tried installing Skype on my Windows 10 desktop, just having it installed (even it not running) slowed down all other programs by about 50%, so I uninstalled it soon afterwards. I haven't seen anything yet on whether the version this update installs fixes this slowdown problem.

Another problem with less effect on BOINC:

It changed your default browser without your permission. For me, changing it back worked, though.
16) Message boards : Number crunching : Graphics card performances (Message 64150)
Posted 3 Dec 2015 by robertmiles
Post:
I want to upgrade the card, but Milkyway is not the main BOINC project I intend to use it on. The main project works much better with Nvidia cards.
17) Message boards : Number crunching : Graphics card performances (Message 64148)
Posted 3 Dec 2015 by robertmiles
Post:
Correct for single-precision performance, but not for the double-precision performance I was looking for information on.
18) Message boards : Number crunching : New Benchmark Thread - times wanted for any hardware, CPU or GPU, old or new! (Message 64142)
Posted 2 Dec 2015 by robertmiles
Post:
Where can I find the latest instruction for running benchmarks? I may be able to get results for about 3 CPUs and about 5 Nvidia GPUs.
19) Message boards : Number crunching : New Benchmark Thread - times wanted for any hardware, CPU or GPU, old or new! (Message 64141)
Posted 2 Dec 2015 by robertmiles
Post:
accidental post
20) Message boards : Number crunching : Graphics card performances (Message 64140)
Posted 2 Dec 2015 by robertmiles
Post:
It looks like I may have a chance to replace one of my computers, using a GTX 560, with a newer computer using a GTX 980, although not very soon. Where can I find information comparing the double precision capability of these two graphics boards?


You can start here:
https://en.wikipedia.org/wiki/List_of_Nvidia_graphics_processing_units#Compute_capability_table


Thanks - that looks like enough information to decide that the GTX 980 probably has a little more double precision performance, even if it doesn't make that definite.


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