You can check the server status page now and see if they're running or not (they're nbody_assimilator and separation_assimilator). I just need to do a bit more debugging on the stop end of things; but starting works which is what was the most important as that should keep work flowing along nicely even if one of the daemons does crash.
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On another note, we're going to be releasing another version of the nbody simulation application this week as a couple changes needed to be made to start it crunching on real data. We'll be starting some new searches which should bump the compute time for the nbody workunits up to the 2-10 hour range.
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--Travis
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Please please please say it is an OpenCL or CUDA/ATI app. I noticed that there is an example nbody app in Nvidia's GPGPU toolkit; not sure if it even has any semblence to what your app does, but it's worth mentioning.