From http://wiki.laptop.org/go/Talk:Designs/Activity_Management#Memory_economics: Memory economics
The memory ring was a *very* effective instructor for memory economics not present in the new design proposal. Perhaps the Frame segment to be occupied by running activities could be used for this purpose by greying the Frame background for each activity with the proportion of memory usage consumed by the overlaid icon. Minimal segment dividers may also help complete the picture. --FGrose <http://wiki.laptop.org/go/User:FGrose> 15:02, 5 April 2008 (EDT) The intent is described in the HIG, Key design principles, Performance<http://wiki.laptop.org/go/OLPC_Human_Interface_Guidelines/Design_Fundamentals/Key_Design_Principles#Performance>: ... Since there is no swap space on the laptop, only a limited number of activities can run concurrently; the Sugar UI exposes these details directly to the children. The Home screen features an activity ring that contains icons representing each instance of an open activity. The size of the ring segment that a given activity occupies represents its overall memory usage; when the ring fills up, no additional activities may be launched until some resources have been freed. ... and also from the Zoom metaphor, Home<http://wiki.laptop.org/go/OLPC_Human_Interface_Guidelines/The_Laptop_Experience/Zoom_Metaphor#Home>: ... The activity ring surrounds the character, indicating all of the currently open activities. Furthermore, the section of the ring that a given activity occupies directly represents the amount of memory that the particular activity requires to run, providing immediate visual feedback about memory constraints and exposing a means for resource management that doesn't require knowledge of the underlying architecture. ...
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