Correctness Checking
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Description
What are the values I should aim for to validate my runs?
I cannot recreate any of the 'Final Origin Energy' values of 4.3 in:
https://asc.llnl.gov/sites/asc/files/2021-01/lulesh2.0_changes1.pdf
Tried running with ./lulesh2.0 -s 5 -i 72
My output:
Running problem size 5^3 per domain until completion
Num processors: 8
Total number of elements: 1000
To run other sizes, use -s <integer>.
To run a fixed number of iterations, use -i <integer>.
To run a more or less balanced region set, use -b <integer>.
To change the relative costs of regions, use -c <integer>.
To print out progress, use -p
To write an output file for VisIt, use -v
See help (-h) for more options
Run completed:
Problem size = 5
MPI tasks = 8
Iteration count = 72
Final Origin Energy = 6.232687e+04
Testing Plane 0 of Energy Array on rank 0:
MaxAbsDiff = 4.547474e-12
TotalAbsDiff = 1.360249e-11
MaxRelDiff = 4.855244e-15
Elapsed time = 0.01 (s)
Grind time (us/z/c) = 1.1185698 (per dom) (0.010067128 overall)
FOM = 7151.9901 (z/s)
All tests were done using the version on the main branch.
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reviewing the cited LULESH 2.0 changes PDF and compare its reported Final Origin Energy value with the main-branch run using ./lulesh2.0 -s 5 -i 72. Reproduce the command and inspect the run's correctness output, then determine which reference value and configuration should be considered correct.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp
- Domain
- testing-qa
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 20/100