Multi-Directed Gravitational Wave Search

Christian Beer
Christian Beer
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Topic 201889

We just started to distribute the first tasks for the next search for continuous gravitational waves on Einstein@Home. It works similar to the recent all-sky search but also has some new features. Here is an overview:

  • We are using a refined dataset based on the data gathered during the first Observational Run (O1) of the LIGO detectors. So it's new datafiles that your computers are downloading. Old datafiles from the all-sky search (and the tuning run) should automatically get deleted from your computer.
  • This time we are looking at three specific targets (positions in the sky) namely Cassiopeia A (CasA), Vela Junior (VelaJr) and G347.3 which are all supernova remnants and most likely emitting continuous gravitational waves.
  • The search is again divided in two parts because the runtime of a task is again depending on the type of the CPU. Since the all-sky search ended we refined our internal timing and memory model and are now able to better predict runtimes based on CPU model. So we are now sending out CasA and VelaJr tasks to fast computers and tasks for G347.3 to all other computers. But we tailored the tasks so that they run for 8h on average regardless of the CPU model (with exceptions, see below).
  • Before starting the real scientific search we are doing a tuning run which will give us valuable information about the data refinement that we did and is only covering a selected frequency range for all targets. This tuning run is expected to run for 2-3 weeks and will have a 7 day deadline. The scientific run thereafter will use a new dataset spanning the whole frequency range from 20 to 1500 Hz.
  • You will experience a varying runtime for tasks in the lower frequency range (20 to 100 Hz) which is a new feature of this kind of search. The explanation is simple. The parameter space that we have to search is frequency dependent which means it is more computing intensive to search all parameters in higher frequencies than in lower. So we don't have enough parameters to check in the lower frequencies which means that they are shorter. But that shouldn't affect the runtime estimation of your client as we scale the FLOPS count of these tasks.

Jim1348
Jim1348
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I see that

I see that both

Multi-Directed Continuous Gravitational Wave Search Tuning CV
Multi-Directed Continuous Gravitational Wave Search Tuning G
are available, and both have been check-marked.  I presume I need only "CV" for my Haswell, so I have unchecked the "G".

Please let me know if you would prefer it differently for your test.

Christian Beer
Christian Beer
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There is no harm in allowing

There is no harm in allowing both apps. The server will automatically assign the correct application. Right now both apps are marked "beta" and the work generation for TCV will start tomorrow morning (~0700 GMT). We are probably also lifting the beta restriction tomorrow after we have the first results back and took a look at them.

Zalster
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Christian,  Can you give us

Christian, 

Can you give us the name of the new work units?

The old ones were  "einstein_O1AS20-100"  otherwise going to have to do some digging to find them

 
Zalster

Jonathan Jeckell
Jonathan Jeckell
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Maybe getting ahead of myself

Maybe getting ahead of myself since this is a Beta of a test run, but are there plans to optimize the Mac OS X version for AVX or SSE as well? 

Jonathan Jeckell
Jonathan Jeckell
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I think I have the dubious

I think I have the dubious distinction of having the first results turned in on this app.  I had 8 work units error out, and the server status page only shows 8 work units returned (in the failed row).  Sigh.

AgentB
AgentB
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Wed 12 Oct 2016 21:02:26 BST

Wed 12 Oct 2016 21:02:26 BST | Einstein@Home | No work is available for Multi-Directed Continuous Gravitational Wave search Tuning run CV Wed 12 Oct 2016 21:02:26 BST | Einstein@Home | No work is available for Multi-Directed Continuous Gravitational Wave search Tuning run G

Looking at the Server page, O1MD1TG may have a few left but looks like all the CasA and Velajr have been eaten!

Christian Beer
Christian Beer
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As I wrote yesterday I just

As I wrote yesterday I just started the job generation for CasA and VelaJr. Right now we don't see an alarming rate of errors. There are several errors but only from a handful of computers and other computers are uploading successful results.

The application names can be found as usual on the application overview page but are in general not needed.

The task names have a similar structure as for the all-sky run. You can see what your computer is doing by this name. Here is a short explanation:

h1_0163.60_O1C02Cl1In1G__O1MD1TG_G3473_163.70Hz_0
|          1            |   2   |  3  |   4    |
1: locality scheduling information
2: application
3: target (CasA, VelaJr, G3473)
4: search frequency
MAGIC Quantum Mechanic
MAGIC Quantum M...
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I was just doing my late

I was just doing my late night checking of my 6 computers to make sure while I sleep they are still working and see I just got (only) two of these new tasks.

Multi-Directed Continuous Gravitational Wave search Tuning run G v1.01 (AVX)

Multi-Directed Continuous Gravitational Wave search Tuning run G v1.01 (SSE2)

But I have so many BRP4G's it will be a while before they get to run here.

 

 

Betreger
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I so far have completed 6 and

I so far have completed 6 and reported them but atm none have been sent out to a wingman so nothing has validated.

archae86
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Betreger wrote:I so far have

Betreger wrote:
I so far have completed 6 and reported them but atm none have been sent out to a wingman so nothing has validated.

One of my machines downloaded seven of these yesterday.  As of now zero of them have been sent to a quorum partner.  My machine has returned two (for example), but validation will be delayed without better quorum distribution.

A second one of my machines has downloaded one WU which actually has been sent to a Linux quorum partner.  Perhaps a difficulty is that the beta rules don't allow distribution of the second task to the main type of host available?

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