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Grzegorz Wiktorowicz
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Message 1265 - Posted: 22 Jul 2016, 12:26:27 UTC

We have just started the tests of a new application. The main goal is to analyse
the possibility of observational detection of quark stars. These objects are
composed of quarks, i.e. particles smaller than neutron or proton. Quark stars are
nearly similar to neutron stars, but we may observe their impact on stellar
populations.

------------------------------------------

Właśnie uruchomiliśmy nową aplikację. Jej głównym celem jest analiza możliwości
obserwacyjnej detekcji gwiazd kwarkowych. Te obiekty składają się z kwarków,
czyli cząstek mniejszych niż neutrony czy protony. Gwiazdy kwarkowe są prawie
identyczne z gwiazdami neutronowymi, ale jest możliwe wyznaczenie ich wpływu na
populacje gwiazdowe
Grzegorz Wiktorowicz
National Astronomical Observatories,
Chinese Academy of Sciences
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Message 1266 - Posted: 22 Jul 2016, 14:01:36 UTC - in response to Message 1265.  

QuarkStars application can use up to 350MB hard disk space in temporary files.
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Message 1267 - Posted: 22 Jul 2016, 19:19:52 UTC

Is this new application compatible with Raspberry devices? If not I will have to create a separate profile for it. It did say that linux under the applications page, but just want to make sure.

Thank you
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Message 1268 - Posted: 22 Jul 2016, 22:08:38 UTC - in response to Message 1267.  

At the moment - isn't.

We have to make some batches first and look at results before we do app compilation for Android and Raspberry devices..
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Message 1269 - Posted: 22 Jul 2016, 22:29:52 UTC

It looks like I started getting these around 11am EST. I should get to some of them by tomorrow.
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Message 1270 - Posted: 24 Jul 2016, 0:32:29 UTC

It seems like some units are getting sent out to quite a few users well before the deadline:
http://universeathome.pl/universe/workunit.php?wuid=6189406
http://universeathome.pl/universe/workunit.php?wuid=6255363
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Pete Broad

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Message 1273 - Posted: 25 Jul 2016, 11:09:55 UTC

I've had 2 of these, both were cancelled by the server, any idea why?

Pete
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Message 1274 - Posted: 25 Jul 2016, 14:23:33 UTC - in response to Message 1273.  

I've had 2 of these, both were cancelled by the server, any idea why?

If you look at your Work Units that were cancelled by server, you will probably find that they were successfully completed by two other crunchers. That is what happens with projects that use a quorum, where two users must receive a work unit to validate against each other. There is always a time limit, and if one user does not return the result soon enough, they send it out to a third user (you in this case). Then, if the one user returns it before you can get to it, the server sends out an abort to your machine, so you don't waste time on it.

There may be other scenarios where that occurs, but I see that commonly on other projects, though it is occurring more often here. Probably the time limits have been set rather short on Universe.
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Message 1275 - Posted: 25 Jul 2016, 14:31:39 UTC - in response to Message 1274.  

I've had 2 of these, both were cancelled by the server, any idea why?

If you look at your Work Units that were cancelled by server, you will probably find that they were successfully completed by two other crunchers. That is what happens with projects that use a quorum, where two users must receive a work unit to validate against each other. There is always a time limit, and if one user does not return the result soon enough, they send it out to a third user (you in this case). Then, if the one user returns it before you can get to it, the server sends out an abort to your machine, so you don't waste time on it.

There may be other scenarios where that occurs, but I see that commonly on other projects, though it is occurring more often here. Probably the time limits have been set rather short on Universe.

Correct.
Also, with new application server always more carefully and sends third WU bit faster then usually.
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Message 1276 - Posted: 25 Jul 2016, 18:25:42 UTC - in response to Message 1275.  

A third WU? Try 10!
http://universeathome.pl/universe/workunit.php?wuid=6189406

Duplicates 2 through 9 were sent within 1 hour of each other. How much as 'a bit faster'?
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Message 1277 - Posted: 25 Jul 2016, 19:11:21 UTC - in response to Message 1276.  

Look at CPU times for extra WU's. All of them doesn't take any CPU time at all.
I'm sure that with more WU's situation with them stabilise. (Anyway, on my hosts this doesn't happened).
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Message 1284 - Posted: 29 Jul 2016, 0:15:22 UTC
Last modified: 29 Jul 2016, 0:17:45 UTC

I am guessing here that due to the reduced run time for Quarkstars against BHSpin (in my case it is over 2,000 seconds less), the credit has now been reduced accordingly from 333.33 to 250.00 per work unit.

Conan
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Message 1285 - Posted: 29 Jul 2016, 1:47:46 UTC

Seems roughly inline with BHSpin v1 PPD except for the BHSpin tasks with 10 in the name. Those are still way too long.
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Profile Sebastian M. Bobrecki
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Message 1288 - Posted: 2 Aug 2016, 8:12:39 UTC

Will there be another tasks for this application? Or maybe it was just a single shot?
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Grzegorz Wiktorowicz
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Message 1289 - Posted: 3 Aug 2016, 9:07:14 UTC - in response to Message 1288.  

Yes, we plan to develop this project further!

Quark Stars have been proposed to explain observations of very massive neutron stars, but these objects are hardly distinguishable from each other. The population studies are necessary, which will be probably available soon with Square Kilometre Array (SKA). However, a lot of theoretical study have to be done before any information may be dug out from observations. This is the goal of Quark Star application. Nevertheless, we are pioneers in such studies so a lot of tests is yet in front of us, before a large scale computation could be started.
Grzegorz Wiktorowicz
National Astronomical Observatories,
Chinese Academy of Sciences
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Message 1290 - Posted: 3 Aug 2016, 11:19:57 UTC - in response to Message 1289.  

Thanks for info Grzegorz. That sounds very interesting.
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