Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Trade-off pnr time and performance #2058

Open
andrewb1999 opened this issue Feb 26, 2021 · 3 comments
Open

Trade-off pnr time and performance #2058

andrewb1999 opened this issue Feb 26, 2021 · 3 comments

Comments

@andrewb1999
Copy link
Collaborator

When experimenting with SymbiFlow a long time ago (almost 2 years ago) I was able to adjust vpr parameters such as astar_fac, max_criticality, acc_fac, initial_pres_fac, etc. to trade-off pnr time and performance. After experimenting with this again recently, it seems changing these parameters no longer provides a significant speedup over the default values.

I am wondering if anyone knows a way to decrease pnr time if I am willing to make significant sacrifices to performance. Are there known changes within VPR that have reduced the impact of these input parameters?
@litghost
Copy link
Contributor

There was an effort to make this trade-off (see #1735 ). I'm not surprised you were not able to extract more runtime.

@andrewb1999
Copy link
Collaborator Author

@litghost I have looked into that work, but my understanding was that it wasn't willing to reduce QoR. Is that correct?

@litghost
Copy link
Contributor

litghost commented Feb 26, 2021 •
edited by unfurl-links bot

@litghost I have looked into that work, but my understanding was that it wasn't willing to reduce QoR. Is that correct?

That is true. You can checkout the raw data used in #1735 in https://colab.sandbox.google.com/drive/1X91RGZnvlC7dBjJJUbS7JfqCbPCzJ3Xb?usp=sharing

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Assignees
No one assigned
Labels
None yet
Projects
None yet
Milestone
No milestone
Development

No branches or pull requests
2 participants
@litghost @andrewb1999