Returns a list of running processes and the architecture they are running under.
Apple M1/Apple Silicon/arm64 macOS can run x86_64 programs via Rosetta and most M1 systems currently (~March 2021) very likely run a mix of x86_64 and arm64 processes.
Activity Monitor can show the architecture, but command line tools such as ps and top do not due to Apple hiding the details of the proper sysctl() incantations necessary to get this info.
Patrick Wardle reverse-engineered Activity Monitor — https://www.patreon.com/posts/45121749 — and I slapped that hack into a bare-bones command line utility archinfo.
It returns columnar output or JSON (via --json) — that will work nicely with jq — of running processes and their respective architectures.
Build from source, grab from the releases, or use homebrew:
brew install hrbrmstr/tap/archinfo$ archinfo
...
5949 arm64 /System/Library/Frameworks/AudioToolbox.framework/AudioComponentRegistrar
5923 arm64 /System/Library/CoreServices/LocationMenu.app/Contents/MacOS/LocationMenu
5901 x86_64 /Library/Application Support/Adobe/Adobe Desktop Common/IPCBox/AdobeIPCBroker.app/Contents/MacOS/AdobeIPCBroker
5873 arm64 /Applications/Utilities/Adobe Creative Cloud Experience/CCXProcess/CCXProcess.app/Contents/MacOS/../libs/Adobe_CCXProcess.node
5863 arm64 /bin/sleep
5861 x86_64 /Applications/Tailscale.app/Contents/PlugIns/IPNExtension.appex/Contents/MacOS/IPNExtension
5855 x86_64 /Applications/Elgato Control Center.app/Contents/MacOS/Elgato Control Center
5852 x86_64 /Applications/Tailscale.app/Contents/MacOS/Tailscale
5849 arm64 /System/Library/CoreServices/TextInputSwitcher.app/Contents/MacOS/TextInputSwitcher
...$ archinfo --pid $(pgrep keyboardservicesd)
60298 x86_64 /usr/libexec/keyboardservicesd
$ archinfo --json --pid $(pgrep keyboardservicesd)
{"pid":60298,"arch":"x86_64","name":"/usr/libexec/keyboardservicesd"}archinfo --json | jq -r --slurp 'group_by(.arch)[] | { arch: .[0].arch, count: length } | [ .arch, .count ] | @tsv'
## arm64 382
## x86_64 12