[WIP] Mpi-Pingpong Benchmark

[michaelmckinsey1]

Description

• Add MPI pingpong benchmark to benchpark.

• Figure out how to pass location of pingpong directory (since private repo) on command line, instead of hard coding Waiting for repo to be public so we can change the url to point at public repo

• Set number of nodes instead of setting total ranks per machine

• Set required variables for benchpark analyze https://github.com/LLNL/benchpark/blob/95b4534919ccb30358376e907115dd5f9d1867c7/experiments/kripke/experiment.py#L141-L145

• Depends on Use different value for placeholder instead of relying on max value #957

Adding/modifying a system (docs: Adding a System)

• Update llnl-*/system.py with sys_sockets_per_node parameter

Adding/modifying a benchmark (docs: Adding a Benchmark)

• Add mpi-pingpong benchmark
• Update package.py to work with Spack 1.0 @scheibelp -> The package works - michael

[michaelmckinsey1]

Running trials in the same allocation parameter (ramble) https://ramble.readthedocs.io/en/latest/workspace_config.html#experiment-repeats

[scheibelp]

(changes here look compatible w/ #953)

[michaelmckinsey1]

Currently this is out of sync with develop in order to run on lassen (pre spack 1.0 PR).

[michaelmckinsey1]

You will probably need this for spack 1.0

Suggested change

	depends_on("c", type="build")
	depends_on("cxx", type="build")

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.43%. Comparing base (6ab499b) to head (2aea1b6).
⚠️ Report is 18 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #726   +/-   ##
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  Coverage    65.43%   65.43%           
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  Files           44       44           
  Lines         3240     3240           
  Branches       256      256           
========================================
  Hits          2120     2120           
  Misses        1113     1113           
  Partials         7        7           

Files with missing lines	Coverage Δ
systems/llnl-elcapitan/system.py	36.29% <ø> (ø)

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