LOAD_FREQ (4*HZ+61) avoids loadavg Moire
From: Klaus Ripke
Date: Sat Nov 12 2011 - 09:45:13 EST
LOAD_FREQ is (5*HZ+1) to avoid high load average when idle:
I suggest (4*HZ+61) for a better distribution.
With some seconds based load (like SSL heartbeats)
and LOAD_FREQ at (5*HZ+1) I see Moire patterns like inverse sawtooth,
since 2 or 3 probes hit the jobs (load increases quickly),
followed by several probes missing it.
A 4.61 sec interval gives optimal distribution over when within a
second a probe is taken, as .61 is close to golden ratio phi 1.618...
(test in http://ripke.com/goldenratio.c).
12*4.61 = 55.32 secs is still close to a minute,
and 13*4.61=59.93 is even closer than the current 12*5.01=60.12
(with exponents EXP_x adjusted to a ratio of 13 instead of 12).
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