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Posts by Jim1348

1) Message boards : News : Server Maintenance 12:00 PM ET (16:00 UTC) 9/23/2022 (Message 74309)
Posted 29 Sep 2022 by Jim1348
I think there are just fewer people who work on Nbody because it doesn't have a GPU application (so it's much less efficient in terms of credit), so it takes longer to crunch through the backlog. It's really not a problem as far as I can tell.

I think the real reason is that if you want to run Separation only on the GPU, you have to turn off "Use CPU". Then, you of course can't run the N-Body.
You need to allow running the Separation GPU work units only, without the CPU Separation work units, while still allowing N-Body to run on the CPU.

(Don't someone tell me to use two BOINC instances. I have been doing that for ages. Not many people will.)
2) Questions and Answers : Unix/Linux : Segmentation Fault with OpenCL (Message 74307)
Posted 28 Sep 2022 by Jim1348
Thanks. That is a useful point of comparison.
3) Questions and Answers : Unix/Linux : Segmentation Fault with OpenCL (Message 74305)
Posted 28 Sep 2022 by Jim1348
The last time I checked, there was not much point in upgrading my RX 570 (Ubuntu 20.04.5) because the timeout on MW limited the speed anyway.
Maybe that has changed now? Maybe someone with a new card will post.
4) Questions and Answers : Unix/Linux : Maybe off topic but...... (Message 74127)
Posted 29 Aug 2022 by Jim1348
Jim, I just thought I would let you know that I don't have any "Local Security Policy" on either of my Win10 machines, but it is available on all of my Win7 machines. I have set a few of them up with the info you submitted here. No luck so far.

If that question is still relevant, maybe you need the Pro version, which is what I have on Win10.
The Home version leaves some things out.
5) Questions and Answers : Unix/Linux : Maybe off topic but...... (Message 74082)
Posted 19 Aug 2022 by Jim1348
It is a very obscure setting. I don't recall where I found it, but use it for setting up all my new Windows machines, starting in the Win7 days.
The setting is still the same. There may still be other settings, but it looks like you and alk44 have found all the other ones I can think of at the moment. There is always something more it seems.
6) Questions and Answers : Unix/Linux : Maybe off topic but...... (Message 74079)
Posted 18 Aug 2022 by Jim1348
Yes, I have Home, Desktop, Documents and Downloads all shared and I get nothing on any of my MS computers.
I know this might seem very strange and that it seems as though I have not done something right, but unless there is something on the Linux side that I have failed to enhance, I can't think of anything else I can do on the MS side.

To see the list of Ubuntu machines on Win10:
Administrative Tools->Local Security Policy->Local Policies->Security Options->Network security:
LAN Manager authentication level: set to “Send LM and NTLM responses”

EDIT: With luck, they will show up automatically in "This PC". But more probably, you will have to enter them manually. Go to Run, and then \\Machine name
For example, "\\Ryzen3900X"
Then, you can drag and drop the machine name or any shared folders to the desktop or wherever.
7) Message boards : Number crunching : Looking for feedback - possible revision to preferences (Message 74036)
Posted 4 Aug 2022 by Jim1348
I will offer some limited feedback. That is nice, but are you opening a can of worms for yourself?
I think BOINC usually has enough problems with the scheduler and other basic functions to make adding more options a questionable endeavor.
8) Message boards : News : Server Trouble (Message 73312)
Posted 4 May 2022 by Jim1348
All of my stuck N-Body uploads have cleared. I am off to other pastures.
That is always the way it is each time I try either CPU or GPU work.
9) Message boards : Number crunching : posting images and spreadsheet snippets (Message 72494)
Posted 4 Apr 2022 by Jim1348
This one was recommended on the BOINC forum, and shows the image in the page.

I used it recently on Rosetta.
10) Message boards : News : Server Trouble (Message 72002)
Posted 17 Mar 2022 by Jim1348
NumberFields@home (nvidia only)

NumberFields runs as well on my RX 570 as on my GTX 1060, at least on Ubuntu 20.04.
11) Message boards : MilkyWay@home Science : Science Summary (Message 71755)
Posted 14 Feb 2022 by Jim1348
Galactic Debris as a Dark Matter Identifier

Crucial to the success of the S5 Collaboration’s maps are data from the Gaia space mission. Compared to data from ground-based measurements, those made by the Gaia space observatory can be used to more quickly and efficiently determine whether a target star is part of a stream, because its observations are not blurred by gases in Earth’s atmosphere, Li says. “Instead of 100, we only need to examine 10 [stars]” to identify one in a stream. Gaia can also be used to measure a star’s composition and its speed in the plane of the sky, providing chemistry information for each stream and 3D velocity information for each stream member.

I am wondering how relevant this is to the work here. Maybe someone with an astronomy background can look into it further.
12) Message boards : News : Validator Outage (Message 71209)
Posted 5 Oct 2021 by Jim1348
I can remember listening to the shortwaves back in the 70's and it was quiet as a cave back before all the modern electronics entered our lives. Every power supply was linear and quiet as can be except maybe for some slight 60Hz hum. Now all our power supplies are switched mode and splatter crap everywhere in the bands.
But Radio Moscow was in the middle of 40 meters. I wouldn't recognize the place now.
13) Message boards : MilkyWay@home Science : Astronomers Detected a Huge New Structure in The Milky Way, And Don't Know What It Is (Message 71057)
Posted 7 Aug 2021 by Jim1348
In August 2019, the researchers used FAST to look for HI radio emissions, and the data revealed what appeared to be a large structure. When they calculated how fast the structure was moving, they got a surprise: its velocity was consistent with a distance of around 71,750 light-years from the galactic center - the outer regions of the galaxy.

That distance - farther than any known spiral arms in that region of the galaxy - would mean the thing is absolutely huge, with a size of around 3,590 light-years in length and 675 light-years in width, based on the FAST data. But then, when the researchers combined their findings with data from the HI4PI all-sky HI survey, they found that it could be even larger still - as much as around 16,300 light-years in length.

That would make it even more colossal than the gas structure known as Gould's Belt, which was recently found to be 9,000 light-years long.

This was cited by QuantumHelos on the Einstein forum. It seems applicable here too.
14) Message boards : Number crunching : N-Body Simulation MT (Message 71041)
Posted 30 Jul 2021 by Jim1348
Only the project can tell you why the limit. But you can run on any number of virtual cores (threads) up to that limit using an "app_config.xml" file.
This is for running on 12 cores, with one work unit per core; change as desired.


<cmdline>--nthreads 1</cmdline>

You create it in a text processor (Notepad), use the "save as" function to save it as an ".xml" file, and place it in the project data folder.
Then restart BOINC or read in the file to activate it.
I usually just reboot. It works on Windows or Linux.
15) Message boards : News : New Poll Regarding GPU Application of N-Body (Message 71036)
Posted 28 Jul 2021 by Jim1348
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.

That must be in the toolkit. They have some info on it:

If this could make it go faster on CUDA, I am all for it. There are plenty of Nvidia cards around.
They could use the AMD cards for the separation work units.
16) Message boards : Number crunching : Feeder not running (Message 71027)
Posted 27 Jul 2021 by Jim1348
I have not been able to get any CPU work or GPU work for the past few hours.
17) Message boards : Number crunching : Can you add option to not run CPU versions of applications for which GPU versions are available? (Message 71017)
Posted 23 Jul 2021 by Jim1348
Yes Boinc does have problems cpu and gpu scheduling and yes you can run both on the same pc with fewer problems...load up a 2nd copy of Boinc in a different directory and run one for cpu tasks and one for gpu tasks. It's not as easy as it sounds but not that difficult either.

I finally got around to doing it. I have done it before when needed, and it does work fine, at least on Linux.

I think that is the hard way though. The project could provide that option I would think.
I doubt that very many people will do the double instances of BOINC trick. It is a bit involved the first time.
18) Message boards : News : Separation Validator Updates/Brief Server Outage(s) (Message 71012)
Posted 23 Jul 2021 by Jim1348
Having not done MW GPU for a while, I thought I would jump in and see.

It is working OK for the moment on my RX 570 under Ubuntu 20.04.2 (latest 21.20 drivers) on a Ryzen 3600.
19) Message boards : Number crunching : Do Windows machines prefer other Windows for validation? (Message 70842)
Posted 31 May 2021 by Jim1348
Yes, that is so. I was just a little surprised that it did not occur the other way, but now I see that it has.
That is, when I get an invalid on the Windows machine, they are validated on two other Linux machines.

So it works both ways. But given the preponderance of Windows PCs, I am a little better off running it that way and getting fewer invalids.
The speed seems to be about the same on either, though I have not done really long-term tests to find out.

Thanks for your input.
20) Message boards : Number crunching : Do Windows machines prefer other Windows for validation? (Message 70840)
Posted 29 May 2021 by Jim1348
I should note that I am running the 1.80 N-Body using one core per work unit, as limited by an app_config.xml file.
All available cores are running, reserving one or two cores to support a GPU.

On the Linux machine I now have 19 invalids, and all have been validated by two Windows machines.
So I think it is clear by now that Windows machines prefer to validate against each other.

Also, I can compare Windows v. Linux on two Ryzen 3600s.
On the Linux (Ubuntu 20.04.2) machine, I see a 9% invalid rate, and a 21% error rate.
On the Win10 machine, I see a 0% invalid rate and also a 21% error rate.

So I will run them on Windows.

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