Posts by Mr. Kevvy


log in
11) Message boards : Number crunching : Average Credit Decreasing? (Message 1789284)
Posted 7 days ago by Profile Mr. KevvyCrowdfunding Project Donor
To add to what Chris wrote: at first there was much complaining that there was never enough work.... we were running out every Tuesday and not catching up until the next day, and plenty of other times as well.
Solved: the SETI@Home scientists built the GBT receiver and a new splitter and got on the Breakthrough Listen initiative, and now we have enough work (possibly even too much!)

Next, there was much complaining (including from myself) that CUDA GPUs weren't being assigned the new GBT work, though it's possibly far more likely to contain a candidate signal, and thus find something.
Solved: the same group beta-tested the impact to system stability/usability of these work units being run on CUDA GPUs and then released them (this was also probably necessary, because there is so much work and CUDA GPUs make up such a significant fraction of machines available to do it.)

Now, there is much complaining that this work is causing a reduction of credit. Sure, it's sad that our RAC is dropping, but it isn't anyone's "fault" except the NVidia engineers who designed the memory architecture of the CUDA-enabled cards, and it's the unintended side effect of something that was asked for. It isn't CreditNew or Dr. David Anderson's doing. Fixed credit won't solve it as 3x the complete speed still equals 1/3 the fixed credit over time. It needs a possibly complex, and possibly impossible, workaround in the SETI@Home client itself.

So, in the interim, be patient, enjoy the new science, and be happy that those GUPPI work units trade off three times the compute time for... I dunno... thousands of times the chance of actually finding something, and I'll take that tradeoff any day!
12) Message boards : Number crunching : Welcome to the 17 Year Club! (Message 1788987)
Posted 8 days ago by Profile Mr. KevvyCrowdfunding Project Donor
Missed mine five days ago... better late than never. Story of my life. :^)
13) Message boards : Number crunching : Average Credit Decreasing? (Message 1788817)
Posted 9 days ago by Profile Mr. KevvyCrowdfunding Project Donor
I'm just crunching for Milkyway for a week and already have a higher RAC, than i had here before...


And if I move to Mexico and get a job as a janitor my paycheque in pesos will be larger than it is currently in dollars.

There won't ever be a BOINC consistent credit payment across projects, because smaller or startup projects or those with not-so-interesting (or nigh-incomprehensible) goals overpay to attract volunteers, and will continue to do so.
14) Message boards : Cafe SETI : Thor is the Designer Cafe! (Message 1788769)
Posted 9 days ago by Profile Mr. KevvyCrowdfunding Project Donor
Yes Thor wants enthusiastic support.


Enthorsiastic!
15) Message boards : Cafe SETI : Thor is the Designer Cafe! (Message 1788737)
Posted 9 days ago by Profile Mr. KevvyCrowdfunding Project Donor
Ever sense you put this thread up my
province has had nothing but bad luck.
Please take it down!


Ahem. The Designer frowns upon being blamed for it. It's practically... Inthorbordination! :^D
16) Message boards : Cafe SETI : Thor is the Designer Cafe! (Message 1788529)
Posted 10 days ago by Profile Mr. KevvyCrowdfunding Project Donor
This thread needs to be warmed up...


Add Thormal energy to crank up the Thormometer! :^)
17) Message boards : Technical News : Data Dump (May 17 2016) (Message 1788250)
Posted 10 days ago by Profile Mr. KevvyCrowdfunding Project Donor
Dunno if you will see this, but may as well ask: with this huge volume of data, how much of it are we volunteers currently able to process? Are we keeping up or falling behind to what fraction?

And, sorry to sound like a broken record, but please let GPUUG know of any hardware needs! Haven't been tapped for a good fundraiser in a while, even though those we did were quite successful.
18) Message boards : Number crunching : Average Credit Decreasing? (Message 1787922)
Posted 12 days ago by Profile Mr. KevvyCrowdfunding Project Donor
very short version:
low AR => longer time to stare at same point => bigger data array for single PoT search => failure to fit cache, failure to get enough parallel data to fill all CUs (longer single array = less number of such arrays cause 1M matrix of data point remains constant)


OK, this helps. Since slewing Arecibo work units don't do this, the AR must be greater than the scope's "aperture". Let's say that the AR is 3x the size of the aperture of the scope.

Then why not break the WU into that ratio of pieces (in this case 3) and run the pulsefind on each piece, then add the results? That way each piece being of the same timebase as an Arecibo Gaussian won't overload the cache.

Edit: This will take some tinkering due to pulses at the edge of each piece that and up in both of them...
19) Message boards : Number crunching : Average Credit Decreasing? (Message 1787907)
Posted 12 days ago by Profile Mr. KevvyCrowdfunding Project Donor
For explanations why VLAR relatively harder for GPU vs CPU vs other ARs look few my recent posts for example (actually it was repeated few times through years).


Thanks for the details... do you have a link to any of these posts?
20) Message boards : Number crunching : Average Credit Decreasing? (Message 1787894)
Posted 12 days ago by Profile Mr. KevvyCrowdfunding Project Donor
Is it more of a driver issue (where we would have to wait for Nvidia to get their act together before there is any relief), the way that the Guppies are configured when they are split (something that can be addressed internally, though with the manpower crunch, is that likely anytime soon?), or something else that causes such a penalty for them on Nvidia hardware? Are things much better in the AMD world? I haven't ran a AMD card for probably 15+ years, so I basically have no experience with them.


I haven't checked the source code enough yet to know for sure, but I have a suspicion:

There's something in the CUDA framework that doesn't like that VLAR work units have negligibly small angular size. This should exclude them from even checking for Gaussians because the telescope is not crossing the signal which is what causes one, so any code which checks for Gaussians shouldn't even run in a VLAR.

The fact that it is running really slowly means that something in there is still using that angular size (what else but a Gaussian would need to use it?), and very likely shouldn't be. So, to find what the code is that does it, and don't run it if the angular width is below the VLAR threshold.

I'm going to try to bring myself up to speed to fix this thing, but I'm hoping someone will beat me to it... it's a lot of work getting there. :^)
Edit: Also when I get there I am not sure I will even recognize it when I see it...lol.
21) Message boards : Number crunching : Average Credit Decreasing? (Message 1787881)
Posted 12 days ago by Profile Mr. KevvyCrowdfunding Project Donor
Every time I look and see my rac dropping I keep thinking there's a problem then I remember Credit Screw


Not the cause anymore... it's now due to your exclusively NVidia farm receiving GUPPI VLAR work units on the GPUs. As noted much elsewhere, they process much more slowly than Arecibo MBs but pay the same credit.
22) Message boards : Number crunching : Windows 10, Chrome, Netflix stuttering now (Message 1787758)
Posted 13 days ago by Profile Mr. KevvyCrowdfunding Project Donor
As you have a 980 which is an NVidia card, the recent release of VLAR GUPPI work units for NVidia CUDA is probably causing the stuttering.

You can fix this under Tools:Computing Preferences by unchecking "Use GPU while computer is in use" and setting an appropriate time below. If you want the GPU computing to occur while the machine is being used, if you have edited app_config.xml and changed the <count> parameter to allow multiple work units to run on the GPU at once, it is suggested to increase the number to reduce the number of work units at once.
23) Message boards : Cafe SETI : A little bit of the kittyman's mind. (Message 1787618)
Posted 13 days ago by Profile Mr. KevvyCrowdfunding Project Donor
Yes, I know, and I'm sorry, but once Mark's post from that original thread re-emerges here, the context will be more clear.


Hey don't be... was just explaining for anyone who wondered what Carlos was doing randomly inserting that. :^)
24) Message boards : Cafe SETI : A little bit of the kittyman's mind. (Message 1787613)
Posted 13 days ago by Profile Mr. KevvyCrowdfunding Project Donor
People keep asking this question. What would Jesus Drive.


This post was spot-on in the now-hidden (and at the time empty) WWJD thread, but now makes no contextual sense whatsoever merged into this one.
25) Message boards : Number crunching : Question Of Meaning = SETI Is Useful Currently : Yes Or No? (Message 1787420)
Posted 14 days ago by Profile Mr. KevvyCrowdfunding Project Donor
Wait... they had a budget for duck tape?




Is this how scientific inducktion and deducktion is developed?
26) Message boards : Number crunching : GBT ('guppi') .vlar tasks will be send to GPUs, what you think about this? (Message 1786705)
Posted 17 days ago by Profile Mr. KevvyCrowdfunding Project Donor
So just checking some of the GUPPI from yesterday for validation.

I'm noticing a large swing in credit from 199 down to 29.

...

Can that be right? I didn't think that was supposed to do that.

I hope I am looking at this wrong, lack of sleep and such...


It looks that way; my RAC, which was rising, has tanked 3K since yesterday, so now we have both this and CreditEw/Pew/Screw dragging it down. And since we are finally getting GUPPI Kepler candidates on our NVidia GPUs, I'm overjoyed! :^D

Edit: This may be due to the longer processing time causing a longer return time for wingies. RAC may rise again.
27) Message boards : SETI@home Science : Kepler Mission Discovers 1,284 New Planets! (Message 1786681)
Posted 17 days ago by Profile Mr. KevvyCrowdfunding Project Donor
So many planets and no way to get there.


...yet.
28) Message boards : SETI@home Science : Kepler Mission Discovers 1,284 New Planets! (Message 1786467)
Posted 18 days ago by Profile Mr. KevvyCrowdfunding Project Donor
NASA's Kepler Mission Announces Largest Collection of Planets Ever Discovered

NASA's Kepler mission has verified 1,284 new planets – the single largest finding of planets to date.

“This announcement more than doubles the number of confirmed planets from Kepler,” said Ellen Stofan, chief scientist at NASA Headquarters in Washington. “This gives us hope that somewhere out there, around a star much like ours, we can eventually discover another Earth.”

Analysis was performed on the Kepler space telescope’s July 2015 planet candidate catalog, which identified 4,302 potential planets. For 1,284 of the candidates, the probability of being a planet is greater than 99 percent – the minimum required to earn the status of “planet.” An additional 1,327 candidates are more likely than not to be actual planets, but they do not meet the 99 percent threshold and will require additional study. The remaining 707 are more likely to be some other astrophysical phenomena. This analysis also validated 984 candidates previously verified by other techniques.


This is fantastic news for us as some of these new worlds are candidates for monitoring with the new GUPPI GBT receiver... looking forward to many happy years of searching (maybe a discovery would be nice too!)
29) Message boards : Number crunching : Average Credit Decreasing? (Message 1786437)
Posted 18 days ago by Profile Mr. KevvyCrowdfunding Project Donor
The kitties like to call their credits....kibblestones.


CreditMew. :^D
30) Message boards : Number crunching : Windows 10 - Yea or Nay? (Message 1785328)
Posted 22 days ago by Profile Mr. KevvyCrowdfunding Project Donor
Avoid Windows 7 KB 3133977 on ASUS motherboards. May prevent your system from booting. Was an Optional but recently made Recommended though the issue was known.

If it boots to a red "Secure Boot Violation" screen, ASUS has posted a solution. (MS page now links to this as well... at one point their "solution" was to install Windows 10.)


Previous 20 · Next 20

Copyright © 2016 University of California