1) Message boards : Number crunching : Stalled computation (Message 73323) Posted 5 May 2022 by corysmath Post: Turns out I almost fixed the stalling problem. A preventative workaround fix is to set the CPU time usage to 100% in the computing preferences, if set lower than that. After doing this none of the n-body tasks that I have run have stalled on the PC's that previously did stall, which all have Intel i7 CPU's. As noted in my earlier post If an n-body task has already stalled the only fix I know is to exit BOINC and restart. Note setting CPU time usage to the maximum 100% will likely increase the CPU temperature. I was able to bring it down by eliminating overclocking and setting performance options to maximize stability and save energy. Some older PC's with duo and quad CPU's (both Intel and AMD) have never stalled on n-body tasks, so I have left the CPU time usage at the default 75%. May the 4th be with you.

2) Message boards : Number crunching : Stalled computation (Message 73069) Posted 22 Apr 2022 by corysmath Post: This n-body task stalled at just 0.038% done with 232 days remaining. I give up but will check back later. Application Milkyway@home N-Body Simulation 1.82 (mt) Name de_nbody_08_31_2021_v176_40k__data__13_1647295263_13271884 State Project suspended by user Received 4/18/2022 9:20:16 AM Report deadline 4/30/2022 9:20:15 AM Resources 8 CPUs Estimated computation size 12,267 GFLOPs CPU time 00:05:00 CPU time since checkpoint 00:03:33 Elapsed time 02:06:50 Estimated time remaining 233d 03:26:21 Fraction done 0.038% Virtual memory size 11.22 MB Working set size 5.24 MB Directory slots/4 Process ID 13236 Executable milkyway_nbody_1.82_windows_x86_64__mt.exe

3) Message boards : Number crunching : Stalled computation (Message 73068) Posted 21 Apr 2022 by corysmath Post: I have had several more stalled n-body tasks today. The latest stalled at 14.004% done after running for over an hour, blocking all other BOINC tasks from running, so I will have to abort it and maybe switch to another project. Here are the stalled task details: Application Milkyway@home N-Body Simulation 1.82 (mt) Name de_nbody_08_31_2021_v176_40k__data__11_1647295263_13261164 State Running Received 4/18/2022 9:20:16 AM Report deadline 4/30/2022 9:20:15 AM Resources 8 CPUs Estimated computation size 12,303 GFLOPs CPU time 00:08:57 CPU time since checkpoint 00:02:01 Elapsed time 01:27:29 Estimated time remaining 08:57:12 Fraction done 14.005% Virtual memory size 11.23 MB Working set size 13.29 MB Directory slots/4 Process ID 6096 Progress rate 9.720% per hour Executable milkyway_nbody_1.82_windows_x86_64__mt.exe

4) Message boards : Number crunching : Stalled computation (Message 72771) Posted 14 Apr 2022 by corysmath Post: Here is an example of an n-body task that stalled:: task de_nbody_08_31_2021_v176_40k__data__12_1647295263_10374507_0 After it stalled the CPU usage was just a few percent suggesting computation was truly stalled. I tried a suspend and resume but remained stalled at 20.843% done. I also tried upping the CPU time usage from 75% to 100% but still remained stalled. After looking through earlier comments in this thread I tried the following: I exited from the BOINC manager and restarted it. This worked; the task progressed normally and ran to completion. Hope this example may help if someone wants to dig into what's happening more than I can.

5) Message boards : Number crunching : Stalled computation (Message 72766) Posted 13 Apr 2022 by corysmath Post: I'm having problems with some tasks that go on indefinitely. The time remaining goes up rather than down so task never finishes. I have to abort the task so others can run. Happens for several Windows 10 computers. Don't know if it is just n-body or not. Will have to shift to other projects if this problem persists.

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