[tor-bugs] #16557 [metrics-lib]: Minor buffering improvements reading descriptors.

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#16557: Minor buffering improvements reading descriptors.
-------------------------+-------------------------
 Reporter:  leeroy       |          Owner:  karsten
     Type:  enhancement  |         Status:  new
 Priority:  minor        |      Milestone:
Component:  metrics-lib  |        Version:
 Keywords:               |  Actual Points:
Parent ID:               |         Points:
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 The reading of descriptors is usually done from a BufferedInputStream
 wrapping the source. The improvement is to change the read from 1k to 8k.
 This coincides with the stream's internal buffer size. The alternative is
 1k reads from an otherwise 8k aligned buffer.

 This patch also wraps the writing of disk files in a
 !BufferedOutputStream.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16557>
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