Yes, you basically give it an offset and as long as you’re doing stripe aligned writes (writes in multiples of the file system block size), and only write a given strip from one process at a time, it’ll generally be pretty high performance. I just checked whether we have wrapped pwrite in filesystem.jl, but it doesn’t seem like it. For the quick and dirty solution see https://github.com/jeff-regier/Celeste.jl/blob/master/src/SDSSIO.jl#L736-L782, which is the same idea but for reads. At some point we should wrap it in base.
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