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Cisco CRS-1 Series Carrier Routing System Getting Started Guide
Chapter 9 Troubleshooting the Cisco IOS XR Software
Understanding Processes and Threads
Under normal operating conditions, processes are managed automatically by the
Cisco IOS XR software. Processes are started, stopped, or restarted as required by the running
configuration of the router. In addition, processes are checkpointed to optimize performance during
process restart and failover.
Figure 9-1 illustrates how the Cisco IOS XR software manages the operations of processes, and acts as
a message, passing “bus” to coordinate interactions between processes. In this way, processes can run
independently, but still communicate and cooperate with other processes. If a process needs to be
stopped or restarted, it affects only that process and related processes and threads.
Figure 9-1 Modular Process Architecture in Cisco IOS XR Software
Commands Used to Display Process and Thread Details
Table 9-3 describes some of the commands used to display information on the processes and threads
running on a router.
For complete details on the commands and options related to process and thread management, refer to
the “Process and Memory Management Commands on Cisco IOS XR Software” in the Cisco IOS XR
System Management Command Reference.
116545
OS
etc...
"Message passing bus”
Microkernel
Process manager
Processes
Processes
Table 9-3 Commands to Display Process and Thread Information
Command Description
monitor processes Displays the ten most active processes and the
current CPU usage. The output from this
command continually refreshes until quit (enter
the q-key to quit).
monitor threads Displays interactive, auto-updating process and
thread statistics in a full-screen mode.
show processes Displays information about active processes.
show processes abort Displays process aborts.
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