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4 changes: 2 additions & 2 deletions source/reference/program/mongoperf.txt
Original file line number Diff line number Diff line change
Expand Up @@ -166,10 +166,10 @@ following form:

In this operation:

- :program:`mongoperf` tests direct physical random read io's, using
- :program:`mongoperf` tests direct physical random read and write io's, using
16 concurrent reader threads.

- :program:`mongoperf` uses a 1 gigabyte test file.
- :program:`mongoperf` uses a 10 gigabyte test file.

Consider using ``iostat``, as invoked in the following example to
monitor I/O performance during the test.
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