- Kernel Block
overhead is a value ranging from 0 to
10000, inclusive. This value is used to determine the number of
units of CPU time allowed to gain 1 unit of latency, according
to the formula shown here:
[time allowed] = 1.3 + (overhead / 100)
This means that an overhead of 0 results in 1.3 units of CPU time allowed, and that the default overhead of 70 results in 1.3 + 70/100 = 2 units of CPU time allowed.
In most cases, rather than to set
SetAllowedSpinOverhead directly using this
DUMP command, it is sufficient to allow its
value to be determined by one of the preset values for the
SpinMethod data node
Additional Information. Added in NDB 8.0.20.