Cisco Nexus 5000 Series Troubleshooting Manual page 5

Chapter 1 Troubleshooting System Management Issues
S e n d d o c u m e n t c o m m e n t s t o n e x u s 5 k - d o c f e e d b a c k @ c i s c o . c o m .
CPU Processes
High CPU Utilization
CPU experiences brief high utilization.
Possible Cause
Brief high utilization caused by CPU multitasking.
Solution
Spikes of high CPU utilization on the Cisco Nexus 5000/5500 switch is normal activity.
The show system resources command displays the high level CPU utilization for the supervisor module.
The show process cpu command with the sort option displays all of the processes sorted by the highest
CPU utilization per process. The show process cpu history command displays the CPU history in three
increments: 60 seconds, 60 minutes, 72 hours. Viewing the CPU history is valuable when correlating a
network event with the past CPU utilization.
Cisco NX-OS takes advantage of preemptive CPU multitasking, so processes can take advantage of an
idle CPU to complete tasks faster. Therefore the show process cpu history command might display CPU
spikes that are not necessarily a problem. Additional investigation is required if the average CPU remains
close to 100%.
Example:
switch# show processes cpu sort
PID
-----
3611
4011
3561
3685
<text ommited>
switch# show processes cpu history
100
90
80
70
60
50 #
40 #
30 #
20 #
10 ############################################################
<text ommited>
OL-25300-01
Runtime(ms) Invoked
----------- --------
57354660 30766347
110298193 27004447
96792384 87683659
862 8678
1 39116 447596
41 11 11111111131 11
808008808093532901815792389618988723121180936746257022006081
#
# # # ## #
0....5....1....1....2....2....3....3....4....4....5....5....
0 5 0
uSecs 1Sec Process
----- ------ -----------
1864 7.0% statsclient
4084 5.3% fcpc
1103 3.5% gatosusd
99 1.8% netstack
87 0.0% init
11 1 12811111121 11 1122 1111111 1
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CPU Processes
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