PTB beta update Psychtoolbox 3.0.20.1 "Appletizer SP1" #856
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Resync with initial Psychtoolbox 3.0.20.0 "Appletizer" release.
Normally IsARM() reports the architecture for which the Octave/Matlab scripting language runtime - and Psychtoolbox mex files in use - are compiled for, ie. if that target architecture is ARM or not. However, emulation layers like Rosetta2 on macOS allow running a Matlab/Octave/Mex file for Intel Macs to run on ARM Macs, and so the reported IsARM() state may be inappropriate for some decision making. The new optional parameter IsARM(1) now queries true host architecture, even in case of Rosetta2 emulation, so we can treat Apple Silicon even when operated from executables originally targeted at non-ARM Intel hardware. The detection logic is not yet implemented for Linux (cfe. FEX-Emu or Box64) or Windows on ARM's emulation layer. That's a todo for the future, but not as urgent as is for macOS atm.
…tta2. Use the new query function to make sure Apple Silicon systems are treated as such, even when operated from a PTB for IntelMacs running under Octave/Matlab for IntelMacs. While this should help those users running Matlab for IntelMacs on their Apple Silicon, note that PTB has not and will not be carefully tested for proper working under such configurations. It's more of a step-gap.
IsARM() is insufficient to decide if latency requirements should be loosened. The assumption was that IsARM == RaspberryPi, but now IsARM can also mean rather powerful Apple Silicon ARM SoC's like M1/M2/M3/M4/... and those do not need loose latency requirements. So only loosen if ARM + Linux. This is still a bit ham fisted as there are many other ARM SoC's under Linux than RaspberryPi which are swept up in this wide net. Baby steps.
kleinerm
added a commit
that referenced
this pull request
Jan 12, 2025
Resync with public 3.0.20.1 release. Merge pull request #856 from Psychtoolbox-3/master
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Compatibility changes wrt. Psychtoolbox 3.0.20.0:
Highlights:
macOS:
Psychtoolbox was built and tested against native Matlab R2024b and against native
Octave 9.3 from HomeBrew, on macOS 13.7.1 Ventura for Intel Macs, and on macOS 14.5
Sonoma for Apple Silicon Macs.
Try to execute same code path on Apple Silicon macOS, regardless if running under native
Matlab/Octave for Apple Silicon ARM, or running under Intel Matlab/Octave via Rosetta2
emulation. Our license management aggregate stats tell us that a non-trivial fraction of users
still use Matlab for Intel Macs via Rosetta2 emulation on Apple Silicon, instead of the recommended
native Matlab/Octave for Apple Silicon. This would cause PTB to misbehave, as it would think it runs
on an Intel Mac and acts accordingly, instead of adapting to the special snowflake that is macOS on
Apple Silicon. This will especially cause trouble with visual stimulation timing and some visual stimulus
presentation. Note that this fix tries to fix this, but Psychtoolbox is not and will not be tested for proper
compatibility and quality when running under Matlab/Octave for Intel via Rosetta2 on Apple Silicon!
Switching to native Matlab/Octave for Apple Silicon / ARM is strongly recommended.
Audio demos and tests: Request standard latency instead of larger latency on Apple Silicon.
The lose latency requirement was only meant to accomodate RaspberryPi's, not Apple Silicon.