lp:~vanvugt/gnome-system-monitor

Author: Daniel van Vugt
Author Date: 2017-10-27 11:11:33 UTC

Fix inaccurate %CPU values in the Processes table

Multi-core machines were displaying inaccurate %CPU values due to a
loss of precision from performing integer division before multiplication.
This changes the order of operations so that no precision is lost, and
now all machines will display process %CPU values to within 1% accuracy.

https://bugzilla.gnome.org/show_bug.cgi?id=788922

Author: Daniel van Vugt
Author Date: 2017-10-27 09:58:28 UTC

Fix inaccurate %CPU values in the Processes table

In the default mode we had an integer %CPU then being multiplied by
another integer NCPUs. Obviously the result of that multiplication
could only have NCPUs granularity so the processes table for an 8-core
machine would only ever show %CPU = {0, 8, 16, 24, 32, ...} etc.

This fix premultiplies the pcpu value by 1000 so as to maintain three
decimal places accuracy. So then when it's multipled by NCPUs we still
have some fractional precision remaining (at least for machines with
less than 1000 cores). And for regular machines the %CPU column now
shows values to within 1% accuracy.

https://bugzilla.gnome.org/show_bug.cgi?id=788922

Author: Daniel van Vugt
Author Date: 2017-10-27 09:39:47 UTC

Fix inaccurate %CPU values in the Processes table

In the default mode we had an integer %CPU then being multiplied by
another integer NCPUs. Obviously the result of that multiplication
could only have NCPUs granularity so the processes table for an 8-core
machine would only ever show %CPU = {0, 8, 16, 24, 32, ...} etc.

This fix premultiplies the pcpu value by 1000 so as to maintain three
decimal places accuracy. So then when it's multipled by NCPUs we still
have some fractional precision remaining (at least for machines with
less than 1000 cores). And for regular machines the %CPU column now
shows values to within 1% accuracy.

https://bugzilla.gnome.org/show_bug.cgi?id=788922