npm

libxres

X.Org X-Resource extension client library for querying X server resources

brewmacoslinux
Try with needOr install directly
Source

About

X.Org: X-Resource extension client library

Commands

xres

Examples

Query resource usage of all windows on the X server$ xres -all
Get resource information for a specific window by clicking on it$ xres
Display resource usage in a more detailed format$ xres -display :0