[jira] [Created] (ARROW-15332) [C++] Add new cases and fix issues in IPC read/write benchmark

["Weston Pace (Jira)" <ji...@apache.org>]

Weston Pace created ARROW-15332:
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             Summary: [C++] Add new cases and fix issues in IPC read/write benchmark
                 Key: ARROW-15332
                 URL: https://issues.apache.org/jira/browse/ARROW-15332
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Weston Pace
            Assignee: Weston Pace


This breaks out the benchmark changes in ARROW-14577 to allow us to more easily demonstrate the effect of the PR.

First, there are a few problems with the current benchmark:

 * The benchmark named ReadFile is misleading since it is actually reading from an in-memory buffer and no OS "read" call is ever issued.
 * Renamed ReadTempFile to ReadCachedFile and added a second case for ReadUncachedFile.  The former reads a file in the OS' page cache and the latter forces a read to actually hit the disk.
 * The TempFile benchmarks were not actually writing the correct amount of data and were reporting unrealistically high rates as a result.
 * Adding a "partial read" parameter which, when true, only reads 1/8 the columns in the file so we can see the impact of pushdown projection.
 * Slightly reduced the range of parameters to keep the benchmark time reasonable (8k columns wasn't telling us anything more than 4k columns).



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