Posts by Miep


log in
1) Message boards : Cafe SETI : Callahan's Crosstime Saloon (Message 1130802)
Posted 1007 days ago by Profile Miep
it helps if you like sweaty chicks too....


I assure you, the feathered kind can not sweat.

Somebody else can have my next drink - or the table might become an attractive spot for dancing.
2) Message boards : Cafe SETI : Seti's own WORD LINK! 15 (Message 1130798)
Posted 1007 days ago by Profile Miep
vendetta
3) Message boards : Number crunching : So What Happened?? (Message 1130760)
Posted 1007 days ago by Profile Miep
Bugs. The kind from the book by Theodore Roszak. (german: Wanzen im Hirn - das Ende der Computer)
4) Message boards : Number crunching : Best cmdline settings for OpenCL apps (how to find)? (Message 1130571)
Posted 1007 days ago by Profile Miep
I read what this and this cmdline settings should do, but I don't understand it. I'm not a coder. I'm an unexperienced user.


Excuse me? If you are an inexperienced user why do you want to run beta and offline benchmarking tools?

Yes, I could adjust this value, adjust this value and then.. maybe it will run. But at the max performance? Noone know it.


I couldn't finish my post yesterday.
I had a nice graphic explanation of why it is difficult to find 'best' performance and why calculating it takes a lot of crunching power and is not really worth the effort.
A human running a few parameter sets and comparing results is much better at homing in on a 'good' performance setting.
Yes an automated script like you describe a pst or so later could work - just that choosing meaningful parameter sets is tricky for a machine and a brute force approach on 4 parameters is just not workable.
And you still need the coder I was talking about.

I read the ReadMe's of the bench tools - I'm not smarter.


You have a whole thread on benchmarking different MB apps.
AP works the same.

As for putting the parameters into the script, the newest approach will have an easily adaptable variable line (as Jason's 1.50 version of MB bench already has).
We have no timeline whatsoever on when the tools section will be up to date and complete.
5) Message boards : Number crunching : Best cmdline settings for OpenCL apps (how to find)? (Message 1130403)
Posted 1008 days ago by Profile Miep
Since a short time Raistmer opened the beta test of his Astropulse OpenCL app for nVIDIA GPUs.

I guess I'm not the only one who have no knowledge/experiences about the cmdline settings for this OpenCL apps. ;-)


Info is buried in various release notes, the readme to the installer and a few threads.

For example for the Astropulse OpenCL app (r521 beta) for nVIDIA GPUs the following cmdline settings are possible:

-unroll N
-ffa_block N
-ffa_block_fetch N
-instances_per_device N
-hp
-no_cpu_lock


And now? ;-)


Complain to Raistmer?
For the benefit of the community, quoting from Raistmer's release notes

-ffa_block - defines how many different periods GPU will process per single kernel call
-ffa_block_fetch - defines how many threads will be used in FFA initial fetch kernel
Rules for using these values:
-ffa_block_fetch <number> can be used only if -ffa_block <number> already listed in command line
numbers should be even,better if they will be power of 2, ffa_block should be divisible by ffa_block_fetch.
If you experience lags during application execution try to decrease these values.

[If you are running smoothly, you can try upping these values]

-hp - sets high priority class
-no_cpu_lock - disables affinity setting
-instances_per_device N - will allow running N copies per each supported GPU device (don't forget to set <count> field in app_info to 1/N to instruct BOINC to launch N tasks per GPU).

-unroll N -sets DATA_CHUNK_UNROLL variable to N. This allows to do N data chunks per FindSinglePulse kernel call improving (in most cases) performance but increasing GPU memory requirements. On low-end GPUs it may be worth to use lower values.

I got the hint that there are Astropulse bench tools available on the Lunatics site.


We are in the process of reorganising tools to make them available to a wider public.

Someone know where are the related threads about this tools?


yes. some two dozen people I'd guess.
Publicly available is the readme in the bench package, which tells you basically everything you need to know.

Someone know how to use this tools?


No, of course not. We have them there, because we find them pretty. No reason at all alpha testers and developers might want to test applications offline.

Maybe it's possible that someone with knowledge could make a very easy full automatically test tool (for unexperienced users) which will test all possible settings/combis (maybe also 1 or 2+ WUs/GPU) which could tell then the best cmdline settings for max performance?

If this test would last one or more days this would be O.K. for me.. ;-)
Then we would be sure to have the best cmdline settings - and the project get the max performance of our machines.


Are you kidding?
Ok, apart from the fact that you'd need somebody with the right skills, the time and the inclination to code this tool, mathematically you are talking about the absolute maximum in a coupled four parameter space. Even if the performance curve held only one maximum it would still take a large amount of calculations to find. It is much more likely that the performance curve is bumpy and then you are looking at something like Monte Carlo to find the best fit.
That isn't to say that some sort of rough approximation can't be done, but even that would take time to calculate [and the above mentioned programmer to do the tool].
Apart from that best parameters almost certainly vary over time (e.g. with system usage, temperatures, the phase of the moon and the sillyness of the person in front of the screen)

I'm afraid for the forseeable future you will have to manually optimise the parameters.

Bear in mind that for AP runtimes are dependant on blanking % and only tasks with similar blanking % should be compared when tuning parameters.
6) Message boards : Cafe SETI : TLPTPW Michael John Hind wins (Message 1130362)
Posted 1008 days ago by Profile Miep
The stuff I had to eat everyday by the spoonfull?


No, not Lebertran :D
7) Message boards : Cafe SETI : Seti's own WORD LINK! 15 (Message 1130358)
Posted 1008 days ago by Profile Miep
20000 miles
8) Message boards : Cafe SETI : TLPTPW Michael John Hind wins (Message 1130356)
Posted 1008 days ago by Profile Miep
uli, if you ever tried something called 'VitamR' (available from the german Reformhaus) that's very similar to Marmite.

Winning with a very light drizzle.
9) Message boards : Cafe SETI : Contest VII (Message 1130354)
Posted 1008 days ago by Profile Miep
109

(you need to start somewhere)
10) Message boards : Cafe SETI : Raccoon Update IX - All Are Welcome In The Critter Cafe (Message 1130353)
Posted 1008 days ago by Profile Miep
high testosterone levels induce chest hair in men - unfortunately for you guys high testostorone also leads to early baldness.
11) Message boards : Cafe SETI : Dan's Poetry Corner II (Message 1130348)
Posted 1008 days ago by Profile Miep
Thank you all :)
12) Message boards : Cafe SETI : Raccoon Update IX - All Are Welcome In The Critter Cafe (Message 1130137)
Posted 1009 days ago by Profile Miep
Why do you think I just imported 1kg of Marmite from the UK?
Berlin is one big mosquito breeding ground.

(and that guy hasn't enough hair on his chest)
13) Message boards : Number crunching : MANEJO DEL PROYECTO SETIHOME (Message 1130126)
Posted 1009 days ago by Profile Miep
Providing translation from spanish:

Hi everybody, I'd like to know a little bit more about the management of BOINC with the SETI project. Does any body know of a good manual/documetation.
I realise my tasks are sent automatically.
14) Message boards : Cafe SETI : Rocky's Original Cafe @ 22/06/11 (Message 1130120)
Posted 1009 days ago by Profile Miep
The little patch of surviving grass gets tended by the gardener for the house compelx.

Oi. where is the rain I was promised this morning and which meant I went to the Museum of technic instead of the zoo?
15) Message boards : Cafe SETI : Raccoon Update IX - All Are Welcome In The Critter Cafe (Message 1129987)
Posted 1009 days ago by Profile Miep
I wonder if Eric is safe from raccoons in Finland...hmmmmmm.


From raccoons probably yes, but I bet he's being eaten by mosquitoes instead.
16) Message boards : Cafe SETI : Dan's Poetry Corner II (Message 1129986)
Posted 1009 days ago by Profile Miep
Where you see a mountain
I see an eagle
Where you see a lake
I see a duck
Where you see trees
I see a monkey
Where you see a desert
I see life

CT (2011)

I walked beyond the horizon
I flew beyond the sky
I climbed beyond the stars
I sailed beyond all time

CT (2011)
17) Message boards : Cafe SETI : Seti's own WORD LINK! 15 (Message 1129760)
Posted 1010 days ago by Profile Miep
cryptography
18) Message boards : Cafe SETI : TLPTPW Michael John Hind wins (Message 1129756)
Posted 1010 days ago by Profile Miep
how does skunk compare to the 'rolled in something' smell?

Winning without know what the nice striped animal smells like.
19) Message boards : Cafe SETI : Mystery Photo Game 20 (Message 1129681)
Posted 1010 days ago by Profile Miep
Pacific?
20) Message boards : Cafe SETI : Contest VII (Message 1129666)
Posted 1010 days ago by Profile Miep
um 172


Next 20

Copyright © 2014 University of California