Commits on Apr 3, 2022

1. Pipe filesystem writes in lightning-persister through BufWriter …

   We generally make no effort to ensure all writes are buffered in
   lower-level objects, so wrapping write calls in `BufWriter` may
   substantially improve performance in some cases. This is especially
   important now that we block the sample node exit until the
   `NetworkGraph` has been written out, which includes many small-ish
   writes.
   
   With this change, shutdown of the sample node on a relatively
   underpowered device went from 15-30 seconds of CPU time to a second
   or two, plus IO sync time.

   

   TheBlueMatt committed Apr 3, 2022
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