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User profile Profile JoLe
I am JoLe, research assistant and PhD student at FernUniversität in Hagen, Germany. Research interests are task scheduling, architecture description...

News

Nbody Release 1.60
Hey All,

I just released a new version of Nbody, 1.60. In this version we completely changed the cost function. This is a function that is used in the histogram comparison algorithm. We discovered that the old cost function, which was supposed to allow us to retain the mass data in the normalized histograms, did not account properly for the amount of mass.

This was not a bug, but rather a change in the science behind the algorithm. We would not have rethought the algorithm without the results from MW@H.

As always, if there is any problem, let me know.

Thank you all,
Sidd
14 Apr 2016, 20:39:34 UTC · Comment


Nbody Release 1.58
Hey All,

I just released a new version of nbody. This one fixes a bug that was found only after instituting the CM correction in the previous release. Let me know if there are any issues.

-Sidd
21 Mar 2016, 17:34:36 UTC · Comment


Nbody Release 1.56
Hey All,

I just released a new version of Nbody. This updates fixes some library issues we were having. Also, it adds a center of mass and center of momentum correction to the initialization (the added computation time is very negligible). We did this because we found that different seeds would produce a small random initial center of mass position and velocity. While it was not a large difference, we wanted it to be nonexistent.

I will be putting up some runs shortly.

As always, thank you all!
Sidd
8 Mar 2016, 19:34:55 UTC · Comment


Nbody Release 1.54
Hey All,

I just released a new version of nbody, version 1.54. There are no major changes, just some minor bug fixes. There was a sampling bug in the velocity assignment which caused it to throw away more possible vels than it should. So the initialization is much faster than before. However, the results should be the same. But faster is always better!

Let me know if there is any issues with the new version/binaries.

Thank you!
Sidd
11 Nov 2015, 17:45:10 UTC · Comment


Reddit AMA
Hey everyone, our Reddit AMA is today. We will begin answering questions at noon eastern time. Check it out here.

Jake W.
6 Nov 2015, 13:05:27 UTC · Comment


Server Maintenance
Hey Everyone,

I'm going to be doing some quick server maintenance for the next hour or so. Should be finished up by 10pm est. Sorry for any inconvenience accessing the website or forums.

Jake W.
5 Nov 2015, 1:12:41 UTC · Comment


Deprecation of Linux 32bit
Hey All,

I have some important news. It seems that all of the linux 32bit binaries are failing. These account for 2k of the 70k returned results so far. I do not think it is the binaries that are at fault since I am getting error returns from them (which I wouldn't if it was the binaries failing on startup). It seems that most of the errors are due to outdated libraries from very old versions of linux.

When compiling our binaries, we use the oldest supported version of ubuntu. However, there is still a large user base for versions older than these. A lot of these seem to coincide with linux 32 bit users. Sending out failing workunits would be a waste of extremely valuable volunteer computer time that could be put to use serving other projects. Therefore, we will be deprecating the Linux 32bit version and will not be releasing them in the future.

I thank you all for continuing support,
Sidd
10 Sep 2015, 19:28:01 UTC · Comment


New Release- Nbody version 1.52
Hey all,

We will be rolling out a new version of Nbody, v1.52, within the next 24hrs. I have left such a large time window because, as these things sometimes go, there could be unforeseen setbacks. I will update everyone once we are about to hit the go button (if only we had an actual go button. That would be so cool.)

We are releasing for windows again. I tested the binaries on a windows machine and they appear to be working. But you never know. Therefore, I will be paying very close attention to the forums for weird behavior. Please let us know!

If you would like more details on what is included in this release, check out my development blog:

http://milkyway.cs.rpi.edu/milkyway/forum_thread.php?id=3798

Thanks everyone for your support
Cheers,
Sidd
8 Sep 2015, 18:08:31 UTC · Comment


Fix for stderr.txt Truncation and Validation Errors
Hey Everyone,

BOINC has released a new version of the BOINC client (7.6.6) which fixes a known bug causing ~3% validation errors on MilkyWay@home and other projects. Please update your clients soon to fix this issue. For more info please see my thread in number crunching here.

Jake W.
23 Jul 2015, 12:49:42 UTC · Comment


Nbody Status Update
Hey All,

Just a quick update on the status of Nbody. I discovered that the hanging that people were experiencing were due to the Newton Raphson root finding algorithm which would get stuck in an infinite loop. After looking for why this occurred for sometime, I decided to switch to a bisection method which is insured not to get stuck.

The slow nature of the initialization of the plummer was found to be an error in the calculation of one of the limits of integration in a crucial integral that was being calculated. What a time it was finding that! With that limit fixed, it seems that the initialization takes a few seconds!

I am currently unit testing the code and hopefully should get a lovely new version in a couple of weeks.

Cheers,
Sidd
25 Jun 2015, 16:28:41 UTC · Comment


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