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Number crunching :
Always immediate segfault on MilkyWay@Home N-Body Simulation v1.62 (mt)
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Send message Joined: 10 Feb 13 Posts: 6 Credit: 1,994,863 RAC: 0 |
N-Body sim always crashes immediately (0 secs CPU) with segmentation fault.
- Other Milkyway@home apps run fine. - Ran a memtest on all cpus in parallel just to make sure it's not hardware. All fine. For instance, see: |
Send message Joined: 19 May 14 Posts: 73 Credit: 356,131 RAC: 0 |
Hey, Thanks for letting us know. I looked into it and it seems that this workunit ran successfully on other systems. However, on a couple of systems there was max disk usage exceeded errors. I am not sure about why that happened and am looking into it. I think perhaps this was the issue with yours but for some reason threw a different error. It might be due to the difference in operating systems, but I am not sure. I will continue looking into it. If this continues with other workunits, please be sure to let us know, Thanks, Sidd |
Send message Joined: 10 Feb 13 Posts: 6 Credit: 1,994,863 RAC: 0 |
Erm, as I mentioned, this happens with *every* WU (of this app) for me. I have more than 100 failed tasks. It's always immediate segfault. I checked many of them, most belong to WU with both failed and successful runs (for other user). But I didnt see many other crashes, mostly the disk usage problem. So it looks a bit specific to me. Unfortunately I dont know how zo obtain more information. P.S. I noticed the app is statically linked. Do you use different libraries or a different compiler for nbody? The segfaults are so early they are likely still during initialization. I recently disabled kernel support for some very old compilers / c libraries. |
Send message Joined: 25 Feb 13 Posts: 580 Credit: 94,200,158 RAC: 0 |
Hey Carsten, We statically compile with very old libraries to support some older systems which run our project. Maybe that is causing the issues. Jake |
Send message Joined: 10 Feb 13 Posts: 6 Credit: 1,994,863 RAC: 0 |
I identfied three possibly related settings:
Enabled heap randomization (breaks libc5) Disable uselib syscall (breaks libc5)
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Send message Joined: 10 Feb 13 Posts: 6 Credit: 1,994,863 RAC: 0 |
I successfully ran MilkyWay@Home N-Body Simulation v1.62 (mt) on the following setup:
enabled heap randomization (breaks libc5) disabled uselib syscall (breaks libc5)
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