More build times

[Lars Ingebrigtsen]

The last week, my build machine has been running a whole bunch of
builds, and here's a chart for the last few months:

What's odd are those peaks.  Let's zoom:

Some builds consistently take 40s longer to run.  And here's what's even
more bizarre:

Those exact same builds take a lot less CPU to run.  So...  less CPU
usage; more real time?  It's bizarre, and perhaps it's just a measuring
artefact of some kind?

Anybody see the same phenomenon on their systems?  (These are clean
builds -- made from a fresh git clone.)

Here's the data in CSV form:

20220602,f71cfd3084,92.74,1101.11
20220603,8f279c8666,92.73,1099.27
20220604,6f69284ada,94.41,1096.24
20220605,1b8719835a,132.86,951.54
20220606,0a36671f41,92.30,1109.85
20220607,8c252e2326,93.21,1114.62
20220608,88b025f815,93.08,1116.36
20220609,d02c94090c,131.41,952.02
20220610,8ef3862fa0,92.34,1111.84
20220611,3247c31d67,91.62,1101.95
20220612,98365c7b1e,93.69,1090.07
20220613,72e0ef74d0,93.58,1114.55
20220614,5678829a62,92.87,1112.83
20220615,787c4ad8b0,94.85,1105.01
20220616,556c304007,93.11,1109.08
20220617,f419de6eca,132.49,957.99
20220618,0d103e6f79,89.38,1084.58
20220619,8b45e7c681,88.23,1074.94
20220620,3947037a33,89.66,1085.17
20220621,4ae315f7c3,89.31,1084.66
20220622,b1af8c2c00,68.61,700.41
20220623,b1af8c2c00,68.15,699.24
20220624,b1af8c2c00,68.16,700.60


-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no