21) Message boards : News : New Runs for MilkyWay@home N-Body (3/20/2020) (Message 69613) Posted 21 Mar 2020 by Eric Mendelsohn Post: Okay. I think I found the problem with the last few runs. I am hoping that these new runs will not crash like last time: -de_nbody_03_21_2020_v176_40k__sim__1 -de_nbody_03_21_2020_v176_40k__sim__2 -de_nbody_03_21_2020_v176_40k__sim__3 Please disregard any error messages from the 03_20_2020 runs. If the problem persists with the 03_21_2020 runs, do not hesitate to let me know. Thank you all for your support. -Eric

22) Message boards : News : New Runs for MilkyWay@home N-Body (3/20/2020) (Message 69612) Posted 21 Mar 2020 by Eric Mendelsohn Post: I apologize these last runs started crashing. They have been taken down and replaced with a temporary run: -de_nbody_03_20_2020_v176_40k__data__7 We will have more runs up and running as soon as we discover the cause. Thank you for your patience. -Eric

23) Message boards : News : New Runs for MilkyWay@home N-Body (3/20/2020) (Message 69611) Posted 20 Mar 2020 by Eric Mendelsohn Post: Hello, I am writing to let you all know that we have just put some new runs up: -de_nbody_03_20_2020_v176_40k__sim__1 -de_nbody_03_20_2020_v176_40k__sim__2 -de_nbody_03_20_2020_v176_40k__sim__3 Thank you all for your support, -Eric

24) Message boards : News : New Runs for MilkyWay@home N-Body (2/10/2020) (Message 69573) Posted 2 Mar 2020 by Eric Mendelsohn Post: The last runs we put have have converged to a result, so now we are replacing them with similar runs: -de_nbody_02_10_2020_v176_40k__data__4 -de_nbody_02_10_2020_v176_40k__data__5 -de_nbody_02_10_2020_v176_40k__data__6 Thank you again for your support. -Eric

25) Message boards : News : New Runs for MilkyWay@home N-Body (2/10/2020) (Message 69532) Posted 10 Feb 2020 by Eric Mendelsohn Post: We apologize once again, but it seems we have run into another error with the last set of runs. These runs will be replaced by the following runs: -de_nbody_02_10_2020_v176_40k__data__1 -de_nbody_02_10_2020_v176_40k__data__2 -de_nbody_02_10_2020_v176_40k__data__3 Rest assured that these errors do not affect the ability of your computers to run the milkyway_nbody application and will not cause you to lose credit. Thank you for your patience and your continued support. -Eric

26) Message boards : News : New Runs for MilkyWay@home N-Body (2/6/2020) (Message 69528) Posted 6 Feb 2020 by Eric Mendelsohn Post: Hello all, I have put up some new runs for milkyway_nbody. Unfortunately, there was an error with last set of runs put up 3 days ago, so these runs will be replacing those: -de_nbody_02_06_2020_v176_40k__data__1 -de_nbody_02_06_2020_v176_40k__data__2 -de_nbody_02_06_2020_v176_40k__data__3 We apologize for any inconvenience this may cause, and we once again thank you for your continued support. -Eric

27) Message boards : News : New Runs for MilkyWay@home N-Body (2/3/2020) (Message 69515) Posted 3 Feb 2020 by Eric Mendelsohn Post: Hello all, We have put up new runs for milkyway_nbody under the following names: -de_nbody_02_03_2020_v176_40k__data__1 -de_nbody_02_03_2020_v176_40k__data__2 -de_nbody_02_03_2020_v176_40k__data__3 If any of these runs cause trouble to your computer, please let us know so that we may resolve any issues. Thank you all for your support! -Eric

28) Message boards : News : New Runs for MilkyWay@home N-Body (1/15/2020) (Message 69514) Posted 3 Feb 2020 by Eric Mendelsohn Post: I apologize, but we are still not supporting Mac right now. We are still working on a new version of Nbody, so hopefully we will be able to support Mac by the time our new version is up. -Eric

29) Message boards : News : New Runs for MilkyWay@home N-Body (1/15/2020) (Message 69444) Posted 22 Jan 2020 by Eric Mendelsohn Post: No. These are just different parameter optimizations. It is going to be a while before we can release another version of nbody. I've seen my own laptop freeze runs from time to time, but restarting my computer always seems to fix it.

30) Message boards : News : New Runs for MilkyWay@home N-Body (1/15/2020) (Message 69434) Posted 16 Jan 2020 by Eric Mendelsohn Post: Happy New Year everyone! I hope you all had a fantastic new year's celebration. To start off the new year, I thought we should put up a few new runs for Nbody as the previous one have converged nicely. The new runs I put up are: -de_nbody_01_15_2020_v176_40k__sim__7 -de_nbody_01_15_2020_v176_40k__sim__8 -de_nbody_01_15_2020_v176_40k__sim__9 Thank you all for your continued support, and I wish you all the best for the new decade. -Eric

31) Message boards : News : Multi-threaded N-body is back (Message 69350) Posted 16 Dec 2019 by Eric Mendelsohn Post: When you look up the work unit that gets stuck and disappears, does it say it was completed or does it log it as a computation error?

32) Message boards : News : Multi-threaded N-body is back (Message 69310) Posted 26 Nov 2019 by Eric Mendelsohn Post: From what I'm seeing in my BOINC manager, the multi-threaded nbody application takes about 4 hours to complete on 8 CPUs. The main reason why these simulations take so long is due to two factors: - We are using 40,000 bodies instead of 20,000. This is the minimum number of bodies we require to ensure the random seed does not drastically affect the final state of the nbody simulation. Our N-body algorithm is O(n log n), which means this change makes runs take 2.14 times longer than before. - MilkyWay@home is optimizing to ultradense cores about 50% of the time. In order to accurately run a dense collection of bodies in an N-body simulation, you need to have a smaller timestep, otherwise, the collection of bodies explodes outwards. The denser the galaxy, the smaller the timestep needs to be. These dense progenitors take about 4 times longer to run than normal, and when MilkyWay@home optimizes to a dense progenitor, we end up with a population of parameters that each take several hours to compute. While we cannot improve the number of bodies, we are working on removing runs that converge to these heavily cored progenitors. We apologize for the inconvenience. Thank you for your patience. -Eric

33) Message boards : News : Single-threaded Nbody deprecated (Message 69309) Posted 26 Nov 2019 by Eric Mendelsohn Post: Could you please tell me which runs are causing these 37 day runtimes?

34) Message boards : News : New Runs for MilkyWay@home N-Body (11/25/2019) (Message 69308) Posted 26 Nov 2019 by Eric Mendelsohn Post: Hey all, We are putting up the following new runs for MilkyWay@home N-body: -de_nbody_11_25_2019_v176_40k__sim__4 -de_nbody_11_25_2019_v176_40k__sim__5 -de_nbody_11_25_2019_v176_40k__sim__6 In other news, we're almost ready to report our results from the last few parameter optimizations on the Orphan Stream. Thank you all for your support. We could not have gotten these results without your time and patience. -Eric

35) Message boards : News : New Runs for Milkyway Nbody (10/03/2019) (Message 69153) Posted 3 Oct 2019 by Eric Mendelsohn Post: Hello all, I am writing to let you all know that new runs for milkyway_nbody have been put up. Two of our runs have been taken down and replaced with two new ones. The runs that are currently up are the following: -de_nbody_08_06_2019_v176_40k__dataExpand__3 -de_nbody_10_03_2019_v176_40k__dataExpand__5 -de_nbody_10_03_2019_v176_40k__dataExpand__6 Thank you all for your continued support. -Eric

36) Message boards : News : Single-threaded Nbody deprecated (Message 69120) Posted 24 Sep 2019 by Eric Mendelsohn Post: Hello all, I am writing to inform you all that the single-threaded Nbody application has been temporarily deprecated. We may bring back the single-threaded app if the multi-threaded app begins causing problems. As always, please let us know if you experience any difficulties with the application. Thank you all for your support. -Eric

37) Message boards : News : Multi-threaded N-body is back (Message 69119) Posted 24 Sep 2019 by Eric Mendelsohn Post: Could you please clarify what you meant by "went off the rails?" Are they spitting out errors? Is the run-time too long?

38) Message boards : News : Multi-threaded N-body is back (Message 69049) Posted 17 Sep 2019 by Eric Mendelsohn Post: Hello everyone, We decided to once again provide support for the milkyway_nbody multi-threaded application. If you discover any issues with the new application, please do not hesitate to contact us so that we may expeditiously resolve them. Thank you all for your continued support. -Eric

39) Message boards : News : New Expanded Runs for Milkyway_nbody (08/06/2019) (Message 68969) Posted 12 Aug 2019 by Eric Mendelsohn Post: Two new runs have just been added to MilkyWay@home: -de_nbody_08_06_2019_v176_40k__dataExpand__3 -de_nbody_08_06_2019_v176_40k__dataExpand__4 Thank you again for your continued support, Eric

40) Message boards : News : New Expanded Runs for Milkyway_nbody (08/06/2019) (Message 68955) Posted 6 Aug 2019 by Eric Mendelsohn Post: Hello all, I've just placed two new runs up onto MilkyWay@home: -de_nbody_08_06_2019_v176_40k__dataExpand__1 -de_nbody_08_06_2019_v176_40k__dataExpand__2 These runs are going to search over a larger phase space, however, due to the technological limitations of simulating incredibly dense dwarf galaxies, a significant portion of this phase space will be skipped. This limitation has been placed in previous runs using the current version of Milkyway_nbody, however, the larger phase space will make this more apparent. We set up our lua file such that runs with abnormally long runtimes will only take a few seconds to complete and return the worst case likelihood score. As credits are calculated dynamically for Nbody, it may take a few runs for Milkyway@home to assign the proper amount of credits. We plan on adding another expanded data run once de_nbody_07_10_2019_v176_40k__data__7 converges. Thank you for your support, Eric

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