Coma FW-C2800 User's Guide download pdf (Page 82)

Implicit DSP/BIOS Instrumentation

3-20

CLK and PRD events are shown to provide a measure of time intervals within

the Execution Graph. Rather than timestamping each log event, which is

expensive (because of the time required to get the timestamp and the extra

log space required), the Execution Graph simply records CLK events along

with other system events. As a result, the time scale on the Execution Graph

is not linear.

In addition to SWI, TSK, SEM, PRD, and CLK events, the Execution Graph

shows additional information in the graphical display. Assertions are

indications that either a real-time deadline has been missed or an invalid

state has been detected (either because the system log has been corrupted

or the target has performed an illegal operation). The LOG_message state,

which has the color green associated with it, appears on the Assertions trace

line for LOG_message calls made by the user’s application. Errors generated

by internal log calls are shown in red on the Assertions trace line. Red boxes

on the Assertions trace indicate a break in the information gathered from the

system log.

See section 4.1.5, Yielding and Preemption, page 4-8, for details on how to

interpret the Execution Graph information in relation to DSP/BIOS program

execution.

3.4.2 The CPU Load

The CPU load is defined as the percentage of instruction cycles that the CPU

spends doing application work. That is, the percentage of the total time that

the CPU is:

❏ Running hardware interrupts, software interrupts, tasks, or periodic

functions

❏ Performing I/O with the host

❏ Running any user routine

When the CPU is not doing any of these, it is considered idle, including when

the CPU is in a power-save or hardware-idle mode. To view the CPU Load

Graph window, as seen in Figure 3-10, select DSP/BIOS

→CPU Load Graph.

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Coma FW-C2800 User's Guide Page 82