QNX RTOS v4 Knowledge Base
QNX RTOS v4 Knowledge Base
| Title |
Monitoring IRQ overhead |
| Ref. No. |
QNX.000009729 |
| Category(ies) |
Utilities, Input Devices, Development |
| Issue |
Does the process time info account for IRQ overhead?
For example, the time reported by 'sin ti' or by 'sysmon'.
|
| Solution |
The interrupt handler time does not get added to the time outputs of 'sin'.
However, there are utilities to determine how much time is being spent in an IRQ handler, as well as how much time is being spent at all priority levels. These programs are called 'imon' and 'sysi', and are available in an archive called sysdbg.tgz. This file is available in the Contributed software section on our website. The path of the archive is:
/usr/free/qnx4/os/development
To use the application enter:
imon -n &
sysi -a
Since these utilities are available from our website, they are not supported by QNX Technical Support |
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