Searching for pulsars in PALFA data from Arecibo

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Profile Bruce Allen
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Message 92812 - Posted: 13 Dec 2008, 21:00:04 UTC
Last modified: 13 Dec 2008, 21:01:44 UTC

We are starting some limited public testing of a new pulsar search on Einstein@Home. This search uses data from the PALFA collaboration, taken at the Arecibo radio observatory. Science information will be available in this thread in the Science Message Board area.

Please use this thread (which is in the Problems and Bug Reports Messsage Board area) to report bugs and problems with this new search. This is especially useful during our initial public testing!

Bruce Allen
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Message 92813 - Posted: 13 Dec 2008, 21:03:19 UTC - in response to Message 92812.

How do we recognize these tasks? Do they have a different name or different application?

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Message 92814 - Posted: 13 Dec 2008, 21:38:37 UTC

Will they download if running the optimized apps, or do we have to remove the app_info and run standard?

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Message 92818 - Posted: 13 Dec 2008, 23:12:37 UTC
Last modified: 13 Dec 2008, 23:13:29 UTC

If we want to take part, can we please have instructions on how to do so.
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Message 92828 - Posted: 14 Dec 2008, 10:26:50 UTC

There is no need for you to do anything, the tasks will be issued randomly between the usual "HierarchicalSearch" tasks. The number of tasks will be very limited during the testing phase (628 workunits at a time), it is rather unlikely you get one. The name of the application will be "einsteinbinary_ABP1" instead of the current "einstein_S5R4". You will be able to opt-out from the "Arecibo binary pulsar search" in your Einstein@home preferences (once the App is in the database, which will be some time tomorrow afternoon CET). Users currently running the Windows Beta App will not automatically get ABP1 tasks, I'll publish instructions and a new app_info.xml in the Beta App thread in the next days. For various technical reasons the ABP1 App will not be available for Mac OS X on PowerPC.

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Message 92890 - Posted: 16 Dec 2008, 13:13:14 UTC

It would be good idea to put info at server-status about how many WU is present in the system.

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Message 92891 - Posted: 16 Dec 2008, 15:10:13 UTC - in response to Message 92890.

It would be good idea to put info at server-status about how many WU is present in the system.


There sure will be once this goes into production, but with the test set of just a few hundred units, it will be more like now-you-see-them,now-you-don't.

CU
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Message 92909 - Posted: 17 Dec 2008, 11:19:50 UTC
Last modified: 17 Dec 2008, 18:38:59 UTC

The first 628 "ABP1" workunits are being produced right now and should be delivered in about 1h.

For this to happen our scheduler runs in a new "mixed" mode, which could break something for the normal operation (S5R4 workunits), too. We did our best to test this, but haven't done this before on the scale of the whole project.

On a machine that needs about 9h10m for a S5R4 task a ABP1 task ran 6h12m.

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Message 92915 - Posted: 17 Dec 2008, 14:11:58 UTC - in response to Message 92890.

It would be good idea to put info at server-status about how many WU is present in the system.


That's a good idea. We'll modify the server status page to show this.
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Message 92925 - Posted: 17 Dec 2008, 20:31:54 UTC - in response to Message 92915.

It would be good idea to put info at server-status about how many WU is present in the system.


That's a good idea. We'll modify the server status page to show this.


Thank you.
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Message 92948 - Posted: 18 Dec 2008, 14:35:38 UTC

Two issues are (now) known for this application:

1. On Windows 98/ME the communication between the worker and the screensaver isn't working, i.e. you'll see the starsphere, but not the data that's usually displayed. That's a common problem to all MinGW-built Windows Applications (i.e. S5R4 Beta Apps, too). We're working on this.

2. The App had a bug that occasionally lead to "general access violations" / "segfaults", preferably on Windows. The bug was in the part of the application that communicated with the screensaver, it didn't affect the scientific computation. This bug has been fixed and a new application version was published, Tasks that are resent because they errored out previously should be run with the new version of the application (minor version 02).

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Message 93050 - Posted: 21 Dec 2008, 23:17:44 UTC

The server that serves the ABP1 workunit data files shut itself down for an emergency at about 19:30 CET. We are investigating, it will probably not be back up before tomorow. ABP1 workunits downloaded now will probably end up as download errors (nope, they are not served by the mirror network).

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Message 93122 - Posted: 25 Dec 2008, 0:10:18 UTC
Last modified: 25 Dec 2008, 0:10:33 UTC

The ABP1 validator stumbled over a result file that apparently forced it into an infinite loop. The program has been diabled until the problem has been fixed. No credit for ABP1 workunits in the next days.

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Message 93203 - Posted: 27 Dec 2008, 11:00:07 UTC

The ABP1 validator has been fixed and is running again.

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Message 95816 - Posted: 26 Mar 2009, 10:36:59 UTC

Now that ABP1 has been officially released and new workunits have been created, could we have the validator running again, please?

Also, I note that the credit 'claim' passed back to the servers is the old benchmark*time figure. I presume that the eventual 'grant' will be a server-determined value, like the LIGO work: otherwise we'll have the old Linux/Windows imbalance back, as with my first WU:

WU 50492230
122176858 886719 25 Mar 2009 5:33:47 UTC 25 Mar 2009 21:56:21 UTC Over Success Done 33,730.76 65.61 pending
122176859 1001562 25 Mar 2009 5:33:26 UTC 26 Mar 2009 10:25:49 UTC Over Success Done 29,658.58 130.00 pending

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Message 95867 - Posted: 31 Mar 2009, 14:12:59 UTC - in response to Message 95816.

Now that ABP1 has been officially released and new workunits have been created, could we have the validator running again, please?

The handling of ABP1 results will be moved to a different machine, for some time the server status page won't be able to show the daemon status correctly.

Also, I note that the credit 'claim' passed back to the servers is the old benchmark*time figure. I presume that the eventual 'grant' will be a server-determined value

Yes.

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Message 95991 - Posted: 3 Apr 2009, 14:05:18 UTC

Hello,

My system just finished a ABP1 file and cannot upload the results. Check the messages file and see the following message:

Error reported by file upload server: can't open file /BOINC/projects/EinsteinAtHome/upload/31b/<filename>:Permission denied.

May I assume that's an issue on the upload server?

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Message 96036 - Posted: 4 Apr 2009, 16:23:37 UTC - in response to Message 95991.


My system just finished a ABP1 file and cannot upload the results. Check the messages file and see the following message:

Error reported by file upload server: can't open file /BOINC/projects/EinsteinAtHome/upload/31b/:Permission denied.

May I assume that's an issue on the upload server?


Hi, this problem has been solved. All uploads should now work flawlessly.

Cheers,
Oliver
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Message 96552 - Posted: 26 Apr 2009, 10:27:24 UTC

Windows XP , BOINC 6.2.19

GDATA InternetSecurity reports it is downloading data when I try to download templates_400Hz.bank

BOINC cannot complete the task download.

RJ

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Message 96555 - Posted: 26 Apr 2009, 11:04:28 UTC - in response to Message 96552.

Windows XP , BOINC 6.2.19

GDATA InternetSecurity reports it is downloading data when I try to download templates_400Hz.bank

BOINC cannot complete the task download.

RJ


Yeah, it's unfortunate that "distributed computing" has been adopted for rather malicious applications (bot-nets etc) so malware-scanners are now detecting what is normal busineess in BOINC as a suspicious thing.

I'm sure there are ways to tell that scanner that the PALFA app (and the S5R5 app) are trusted by you, right?

CU
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This material is based upon work supported by the National Science Foundation (NSF) under Grants PHY-1104902, PHY-1104617 and PHY-1105572 and by the Max Planck Gesellschaft (MPG). Any opinions, findings, and conclusions or recommendations expressed in this material are those of the investigators and do not necessarily reflect the views of the NSF or the MPG.

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