Decoding Output of spy command

[VxWorksEnthusiast]

Hi there, need help with decoding of Spy command. I have a system, where I have been trying to characterize some data, and whatever combinations that I try out, the spy output always shows tIdle is always lesser number.

When I look at my other application task usage, most of the tasks are not using more than 5% of them, but am still seeing tIdle as less than 5

I have couple of questions here.
-> Why is the TOTAL always around 87% (I have never seen it around 100% or closer to it.
-> I would have ideally liked my application to be around 20-25% of tIdle time. With the stats below, is my system in a bad-shape ?
-> Can i assume that if the tSpyTask is not running, I have more CPU time under tIdle ?

Please help me decode this and advise.

Typical output is

NAME ENTRY TID PRI total % (ticks) delta % (ticks)\
-------- -------- ----- --- --------------- ---------------\
tExcTask excTask 3c06788 0 0% ( 0) 0% ( 0)\
tLogTask logTask 3c089f8 0 0% ( 0) 0% ( 0)\
tShell shell 4eb3778 1 0% ( 2) 0% ( 0)\
tTnetShelld telnetd 4e0de38 2 0% ( 0) 0% ( 0)\
tRlogind rlogind fb390b8 2 0% ( 0) 0% ( 0)\
tSpyTask spyComTask 2b0ba130 5 13% ( 5392) 13% ( 188)\
tPoller f94b638 10 24% ( 9653) 24% ( 343)\
tAgent1 agt_1 fa27588 160 3% ( 1273) 2% ( 40)\
tAgent2 agt_2 fa81288 160 4% ( 1913) 4% ( 67)\
tAgtent3 agt_3 7669c28 180 2% ( 1155) 2% ( 33)\
txyTask xyTask() f93ec78 185 3% ( 1273) 2% ( 40)\
tFM fmTask() f4e2728 190 1% ( 555) 10% ( 146)\
tPM pmTask() fa57f78 190 1% ( 467) 1% ( 17)\
tHttpdTask 1386da28 190 5% ( 2146) 3% ( 53)\
tMyAgt2 2c71a410 190 6% ( 2771) 6% ( 94)\
tMyAgt3 2bdf00a0 190 3% ( 1250) 2% ( 34)\
tMyAgt4 2b0d16f0 190 4% ( 1682) 2% ( 33)\
tMyAgt7 2981e7f0 190 3% ( 1510) 3% ( 42)\
tMyAgt5 297fe3d0 190 4% ( 1972) 1% ( 23)\
tIdle f94cf88 255 3% ( 1269) 0% ( 1)\
KERNEL 1% ( 504) 1% ( 16)\
INTERRUPT 7% ( 3147) 7% ( 97)\
IDLE 0% ( 9) 0% ( 1)\
TOTAL 87% ( 40017) 88% ( 1374)\

[philippe.k....@gmail.com]

Hi,

This could be a sampling rate side effect. You may want to change the auxiliary clock rate before running spy.

-> sysAuxClkRateSet (somePrimeNumber)

Philippe

[VxWorksEnthusiast]

Thank you Philippe,
The current rate on my system is configured as

-> sysAuxClkRateGet
value = 95 = 0x5f = '_'

Are you suggesting it to increase this and verify it for more accurate % ?

Regards

[philippe.k....@gmail.com]

It also depends on the system clock frequency.

What you want is a frequency faster than the system clock and not a fundamental harmonic of it. Eg: When system clock is 100 Hz you can use 113 Hz for the auxiliary clock.

Philippe