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Posts by Bill F
Posts by Bill F
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1) Message boards : MilkyWay@home Science : Nbody Science (Message 67898)
Posted 3 days ago by Profile Bill F
Hi,

I'm Colin Rice an undergraduate at RPI who has been working with mw@home for about a semester now. I'm posting to give a little insight into the nbody simulations which I recently took over.

A N-Body simulation is a simulation where you are using multiple small bodies and applying forces between them to simulate some sort of physical system. In our case we are simulating a dwarf galaxy orbiting the milkyway.

We are currently investigating the makeup of dark matter within dwarf galaxies. Due to inconsistent angular velocities we think there may be dark matter inside of dwarf galaxies. However it is not conclusively proven.

Our goal is to determine if dark matter inside of a dwarf galaxy causes a distinctive orbit when the galaxy is then pulled into an orbit about the milkyway. We are doing this in two steps.

1)We are currently running simulations to see if the N-Body system can recover the initial parameters of a dwarf galaxy which we generated with dark and light matter, and then evolved in time.

Specifically, when an nbody runs the server has generated a trial set of parameters and is evolving them to see if they match the observed histogram. It then evaluates how well they worked and creates new runs based on the current runs fitness. It only evaluates the fitness based on the light matter. However, it used both light and dark matter when running the simulation. This is done because we can only see the light matter in real world data and that is what this system is designed to process.

2) The next step after we confirm that the technique works via test runs is to put real world data into the simulation and see if we can figure out the initial parameters for the dark matter inside the dwarf galaxies. We can't just plug in the initial data because we are unsure as to whether the system works.


Can we get an update on this thread ? Does the system work and are we feeding any real data yet using it ?

Thanks
Bill F
2) Message boards : News : New MilkyWay@Home Developer (Message 67719)
Posted 22 Aug 2018 by Profile Bill F
Eric

Welcome aboard !!!

I am looking forward to your efforts to improve the MilkyWay Project. A lot of the volunteer crunchers out here have been with the project for years. We are committed to the project and have weathered a few storms and hick ups.

Please be as frequent as you can be with news and updates as they are always appreciated.

I understand that in code development you can't test every platform, but the more you can debug an application version before release the less pain we have out here.

Again welcome aboard

Bill F
Dallas TX
3) Message boards : Number crunching : New MAC BOINC Client 10.7.3 64Bit on Intel (Message 67601)
Posted 15 Jun 2018 by Profile Bill F
A patched release of the BOINC Client for MAC OS 64Bit on Intel was released on June 6th.

Version 10.7.3

Bill F
4) Message boards : Number crunching : Profiles? (Message 67368)
Posted 20 Apr 2018 by Profile Bill F
The Force was truly with you !

Light has prevailed over darkness !

Truth and Justice come in first !

You have slain the Dragon !

Yep ... IT WORKS !!!

Thank you for being persistent.

Bill F
Dallas TX
5) Message boards : Number crunching : Profiles? (Message 67274)
Posted 24 Mar 2018 by Profile Bill F
Jake,

BETA has been around since 2008 and I have been around since 2009. I suspect that we will be patient and stick around. Take your time and swat the bug.

Thanks
Bill F
6) Message boards : Number crunching : Profiles? (Message 67272)
Posted 22 Mar 2018 by Profile Bill F
It appears that if you are not using the correct browser and it is not configured just so you can't see the reCaptcha.

I have been working with a Moderator / volunteer to resolve my issue but 3 browsers and two PC's later I still can't edit my profile.

Bill F
Dallas
7) Message boards : Number crunching : Profiles? (Message 66982)
Posted 21 Jan 2018 by Profile Bill F
still having this issue ... after editing my profile and submitting it the error message says that my ReCaptcha is not valid. Well I was not offered box to check so yes I just it is and ....

yes ReCaptcha is broke again.

Bill F
Dallas TX
8) Message boards : Number crunching : New MAC Boinc Client 7.8.6 (Message 66969)
Posted 17 Jan 2018 by Profile Bill F
BOINC 7.8.6 for Mac OS is now available on the primary BOINC Download Site:

https://boinc.berkeley.edu/download_all.php

From Charlie Fenton ...

This is a release for Macintosh only; there are no changes from 7.8.3, 7.8.4 or 7.8.5 affecting the code for any other platform. It fixes a couple of Mac-only bugs in 7.8.5:
* Reliably installs the BOINC screensaver (unless asked not to do so.)
* Fixes a bug which could prevent determining the correct size of RAM when run on versions of OS X older than OS 10.11.
9) Message boards : News : New Runs 11/21 (Message 66813)
Posted 26 Nov 2017 by Profile Bill F
You might want to try Seti they are still generating work for older Power Books

Bill F
10) Message boards : Number crunching : BOINC Client 7.8.4 recommended for MAC OS (Message 66779)
Posted 15 Nov 2017 by Profile Bill F
New Recommended Client for MAC OS

Fixes the calculation of GPU memory when running under OS 10.13 High Sierra.

Bill F
11) Message boards : Number crunching : BOINC Client 7.8.3 (Message 66683)
Posted 17 Oct 2017 by Profile Bill F
New updated BOINC client 7.8.3 has been released to fix many of the bugs in prior 7.8.2.

Not recommended for Spanish language yet.

Bill F
12) Message boards : Application Code Discussion : Android ARM application (Message 66674)
Posted 30 Sep 2017 by Profile Bill F
Has there been prior discussion of the possible creation of an Android App for cell phones. And or a request out to volunteers to assist with a port / create ?

Lots of hardware out there and lots of volunteers.

Thanks
Bill F
13) Message boards : Number crunching : Computation errors? (Message 44379)
Posted 28 Nov 2010 by Profile Bill F
I am having a immediate error problem on only one of my systems an older Windows box single cpu 1.8mhz running Win2000. The work unit downloads showing an estimated time of 451 hours and immediately errors when it starts to run. None of my other systems is doing this.

Suggestions anyone ?

11/27/2010 8:31:17 PM Milkyway@home Scheduler request completed: got 1 new tasks
11/27/2010 8:31:19 PM Milkyway@home Started download of de_separation_14_3s_fix_1_1690243_1290911426_search_parameters
11/27/2010 8:31:21 PM Milkyway@home Finished download of de_separation_14_3s_fix_1_1690243_1290911426_search_parameters
11/27/2010 8:31:21 PM Milkyway@home Starting de_separation_14_3s_fix_1_1690243_1290911426_0
11/27/2010 8:31:21 PM Milkyway@home [error] Process creation failed:
11/27/2010 8:31:21 PM Milkyway@home [error] Process creation failed:
11/27/2010 8:31:21 PM Milkyway@home [error] Process creation failed:
11/27/2010 8:31:21 PM Milkyway@home [error] Process creation failed:
11/27/2010 8:31:22 PM Milkyway@home [error] Process creation failed:
11/27/2010 8:31:23 PM Milkyway@home Computation for task de_separation_14_3s_fix_1_1690243_1290911426_0 finished





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