RTEMS 4.6.5 On-Line Library

Timing Specification What is measured?

RTEMS Hitachi SH Applications Supplement

9.3.3: What is measured?

An effort was made to provide execution times for a large portion of RTEMS. Times were provided for most directives regardless of whether or not they are typically used in time critical code. For example, execution times are provided for all object create and delete directives, even though these are typically part of application initialization.

The times include all RTEMS actions necessary in a particular scenario. For example, all times for blocking directives include the context switch necessary to transfer control to a new task. Under no circumstances is it necessary to add context switch time to the reported times.

The following list describes the objects created by the timing suite:

All tasks are non-floating point.
All tasks are created as local objects.
No timeouts are used on blocking directives.
All tasks wait for objects in FIFO order.

In addition, no user extensions are configured.

RTEMS Hitachi SH Applications Supplement