[kudu-CR] [util] add performance test scenario for ThreadPool

["Alexey Serbin (Code Review)" <ge...@cloudera.org>]

Hello Kudu Jenkins, Andrew Wong, Grant Henke, 

I'd like you to reexamine a change. Please visit

    http://gerrit.cloudera.org:8080/16401

to look at the new patch set (#2).

Change subject: [util] add performance test scenario for ThreadPool
......................................................................

[util] add performance test scenario for ThreadPool

Added a test scenario to assess ThreadPool's performance in the absence
and the presence of QueueLoadMeter.  The newly added scenario uses
a mix of serial and concurrent ThreadPool tokens.

Below are the results when running a RELEASE build on a 48-core
E5-2680 Xeon @ 2.50GHz machine:

  Processed 600000 tasks in real 1.366s       user 0.933s sys 54.512s
  Processing rate (QueueLoadMeter disabled): 439345.75398195261 tasks/sec

  Processed 600000 tasks in real 2.484s       user 1.815s sys 111.655s
  Processing rate (QueueLoadMeter  enabled): 241564.74471673707 tasks/sec

Change-Id: I470d204f3b3a22407361a920882a93d6f21dd274
---
M src/kudu/util/threadpool-test.cc
1 file changed, 85 insertions(+), 4 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/01/16401/2
-- 
To view, visit http://gerrit.cloudera.org:8080/16401
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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I470d204f3b3a22407361a920882a93d6f21dd274
Gerrit-Change-Number: 16401
Gerrit-PatchSet: 2
Gerrit-Owner: Alexey Serbin <as...@cloudera.com>
Gerrit-Reviewer: Andrew Wong <aw...@cloudera.com>
Gerrit-Reviewer: Grant Henke <gr...@apache.org>
Gerrit-Reviewer: Kudu Jenkins (120)