Github user a-roberts commented on the issue:
https://github.com/apache/spark/pull/15736
I'm resuming the work for all of these related PRs again this week after
the London Spark meetup on Wednesday, if you are keen to take it on I'm more
than happy to help out and will share some information here that yourself and
others should find useful.
**Useful tools**
As well as simple microbenchmarking we use the [Linux perf
tools](https://perf.wiki.kernel.org/index.php/Main_Page),
[tprof](http://perfinsp.sourceforge.net/tprof.html) with [Visual Performance
Analyzer](http://www.scalabiliti.com/library/visual_performance_analyzer) and
also IBM's
[Healthcenter](https://www.ibm.com/developerworks/java/jdk/tools/healthcenter/)
for Java for method profiling (this is bundled with the JDK and you provide
-Xhealthcenter as a driver/executor option then open the files in said tool).
**Benchmarks**
We'd want to run our improvement ideas with and without the changes using[
HiBench 6](https://github.com/intel-hadoop/HiBench) (large profile) and
[SparkSqlPerf](https://github.com/databricks/spark-sql-perf) against all 100
TPCDS queries.
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