Siemens SM2 monitoring system, U3585-J-Z125-8-76 1 manual Normed, Measured

CPU report	SM2 reports
NORMED	In the NORMED TO 100 % section, the sum of the percentage values for
	TU, TPR, SIH and IDLE is 100 %.
MEASURED	The percentage values measured for TU, TPR, SIH and IDLE are output in
	the MEASURED section.
	When using VM2000, there may be discrepancies between the NORMED
	value and the MEASURED value (see also section “SM2 together with
	VM2000” on page 347). In particular, you should remember that the times
	specified refer to the assigned CPUs of the VM and not to the system as a
	whole. The average values across all processors are output in the AVG row.
	SR2000:
	Under VM2000/SR, the real CPUs are assigned exclusively to guest
	systems, i.e. the values under MEASURED are the same as those under
	NORMED.

Notes

While SM2 records the sum of the TU and TPR times precisely, this total is divided into TU and TPR times on the basis of the proportion of the samples that fall to TU and TPR. This causes statistical inaccuracies in the calculation of TU and TPR times, which can be noticeable in the case of small TU and TPR values (i.e. when a small number of samples fall to TU and TPR). TU or TPR values of 0.0 % (online reports) or 0.0 milli- seconds (TIME_IO buffer of the C interface), in particular, should therefore be inter- preted with caution. The monitored data on CPU utilization is based on native CPU time (see “CPU time and CPU service units on SR2000” on page 446 of the glossary).

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