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836 B
836 B
nullrw
nullrw=true|false- Defaults to
false.
Due to how FUSE works there is an overhead to all requests made to a FUSE filesystem that wouldn't exist for an in kernel one. Meaning that even a simple passthrough will have some slowdown. However, generally the overhead is minimal in comparison to the cost of the underlying I/O. By disabling the underlying I/O we can test the theoretical performance boundaries.
By enabling nullrw mergerfs will work as it always does except
that all reads and writes will be no-ops. A write will succeed (the
size of the write will be returned as if it were successful) but
mergerfs does nothing with the data it was given. Similarly a read
will return the size requested but won't touch the buffer.
See the benchmarking section for suggestions on how to test.