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Exadata: excessive CPU used by "migration" threads after 11.2.3.3.0 upgrade (Doc ID 1666505.1)

Last updated on SEPTEMBER 05, 2016

Applies to:

Oracle Exadata Storage Server Software - Version 11.2.3.3.0 and later
Linux x86-64

Symptoms

It shows "migration" threads are consuming very high CPU resource.

# ps -eo pcpu,pid,user,args | sort -k 1 -r | head -50
%CPU    PID USER     COMMAND
99.6    602 root     [migration/134]
99.4      8 root     [migration/1]
99.4    376 root     [migration/88]
99.3    527 root     [migration/116]
99.3    348 root     [migration/81]
98.2    606 root     [migration/135]
98.1    678 root     [migration/153]
97.8    702 root     [migration/159]
97.5    268 root     [migration/61]
97.4    412 root     [migration/97]
96.8    416 root     [migration/98]
95.6    598 root     [migration/133]
95.2    586 root     [migration/130]
94.2    650 root     [migration/146]
94.1    424 root     [migration/100]
94.1    296 root     [migration/68]
94.1    280 root     [migration/64]
93.7    340 root     [migration/79]
92.5    694 root     [migration/157]
91.3    670 root     [migration/151]
90.0    328 root     [migration/76]
89.3    336 root     [migration/78]
89.1    618 root     [migration/138]
88.5    141 root     [migration/34]
86.4    304 root     [migration/70]
85.1    300 root     [migration/69]
84.7    509 root     [migration/114]
84.6    482 root     [migration/111]
84.5     93 root     [migration/22]
82.2    682 root     [migration/154]
82.1    117 root     [migration/28]
81.8    638 root     [migration/143]
80.8    324 root     [migration/75]

 

Changes

Exadata image was upgraded to 11.2.3.3.0. 

New OS kernel is uek2:

2.6.39-400.126.1.el5uek #1 SMP Fri Sep 20 10:54:38 PDT 2013

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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