archinfo

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 together with some code from Sydney San Martin — https://gist.github.com/s4y/1173880/9ea0ed9b8a55c23f10ecb67ce288e09f08d9d1e5 — into a nascent, bare-bones command line utility archinfo.

It will do slightly more, soon, but for now, it just returns a big JSON blob (that will work fine with jq) of running processes and their respective architectures.

Build from source or grab from the releases.

Rscript -e 'table(jsonlite::fromJSON(system("/usr/local/bin/archinfo", intern=TRUE))$arch)'
##
## arm64 x86_64
##   419     29