libretro / libretro/parallel-n64
Recent, significant performance regression with Angrylion
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- Dominant language
- C
- Stars
- 407
- Forks
- 151
- Avg merge
- 11h 53m
- Merged PRs (30d)
- 11
Description
I currently use a build of ParaLLel on this commit, because a subsequent one caused large performance degradation on my system, and despite recent performance enhancements I am still not able to achieve similar frame rates using the new dynamic recompiler.
The commit I suspect is this one, but I have not retested it recently. The first regressed build I have is on this commit.
Changing the RDP from the default "auto" setting, or modifying thread sync level, doesn't seem to change much (I did make sure to close and restart the core between each change).
CPU is Ryzen 2700X, platform is Windows x64. I used Doubutsu no Mori to test performance, as the title screen chugs on recent versions.
Contributor guide
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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
Compare the known-good commit 017d864 with the first regressed commit d59e033, including the suspected change fbf39c86419513d0925cd5d47f9f0c5af1f8dda2. Reproduce the title-screen slowdown in Doubutsu no Mori on Windows x64 with the Ryzen 2700X, then identify the change responsible and verify that performance returns to the earlier level.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- c
- Domain
- performance
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100