spoiler alert 9pfs does read only mmap by default color me sad https://twitter.com/b0rk/status/984431593954590728 …
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FWIW, once upon a time I rolled out a ‘performance improvement’ to use mmap on a gpfs cluster. It turns out if you do that on a write enabled file that it globally locks file segments across the cluster. Our cluster ground to a hault. The fix was setting file attrs to read only.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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