About
Early reports of compiling cactuBSSN_r with rv64gcv indicate vectorization may be making this code worse. The report indicates we're executing ~114b additional instructions. This needs to be understood and addressedCactuBSSN was showing a 1-2% degradation in instruction counts with vector enabled. That has been fixed as of b7b387e1200f on the GCC trunk and we see roughly a 1% dynamic instruction count improvement.
Beyond fixing the regression, vector is not expected to provide much benefit for CactuBSSN.
Stakeholders/Partners
RISE:
...
| Page Properties | ||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Updates
- Regression has been fixed on the GCC trunk
- Competitive data shows no significant improvement with vector
- The 1% reduction in instruction counts we see with vector enabled is not likely to move the needle in any significant way performane-wise
- Considering this done/closed.
- Project reported as a priority for 1H2024
...