CPU Usage: Performance questions
Hi,
i've a two node rac 11.2 on aix.
There are some nightly job that consume high cpu.
Looking awr i see:
Load Profile Per Second Per Transaction Per Exec Per Call
~~~~~~~~~~~~ --------------- --------------- ---------- ----------
DB Time(s): 7.1 0.0 0.00 0.07
DB CPU(s): 1.0 0.0 0.00 0.01
Redo size: 1,633,163.0 2,639.6
Logical reads: 112,042.4 181.1
Block changes: 10,777.0 17.4
Physical reads: 286.1 0.5
Physical writes: 174.2 0.3
User calls: 105.3 0.2
Parses: 1,172.9 1.9
Hard parses: 30.2 0.1
W/A MB processed: 11.0 0.0
Logons: 0.8 0.0
Executes: 8,386.1 13.6
Rollbacks: 0.1 0.0
Transactions: 618.7Top events:
Avg
wait % DB
Event Waits Time(s) (ms) time Wait Class
DB CPU 7,215 14.1
db file sequential read 882,357 2,914 3 5.7 User I/O
resmgr:cpu quantum 406,418 1,915 5 3.7 Scheduler
buffer busy waits 192,071 466 2 .9 Concurrenc
gc cr grant 2-way 253,278 298 1 .6 ClusterHost cpu:
Host CPU (CPUs: 6 Cores: 3 Sockets: )
~~~~~~~~ Load Average
Begin End %User %System %WIO %Idle
14.23 5.11 58.5 18.0 1.9 23.5It shows 23.5% of idle cpu.
Looking vmstat for the period:
DATA RUN BCK AVM FRE PRE PPI PPO PFR PSR PCY FIN FSY FCS Cpu User Cpu Sys Cpu Idle Cpu Wait
01/14/2013 22:33:54 16 0 6639173 8973 0 0 0 0 0 0 3716 124593 17276 87 13 0 0
01/14/2013 22:33:55 15 0 6639055 9073 0 0 0 0 0 0 3799 122613 17578 89 11 0 0
01/14/2013 22:33:55 14 0 6636873 11234 0 0 0 0 0 0 3144 108492 16358 90 10 0 0There is no idle.
Looking Active sessions graphs:
http://imageshack.us/photo/my-images/855/graph01.jpg/
So, why AWR show only 14.5% ob db cpu and 23.5% of idle and vmstat and active session history show 0 of idle?
Thank you.
Edited by: 842366 on 15-gen-2013 7.53
842366 wrote:
i've a two node rac 11.2 on aix.
There are some nightly job that consume high cpu.
Looking awr i see:
Load Profile Per Second Per Transaction Per Exec Per Call
~~~~~~~~~~~~ --------------- --------------- ---------- ----------
DB Time(s): 7.1 0.0 0.00 0.07
DB CPU(s): 1.0 0.0 0.00 0.01
Redo size: 1,633,163.0 2,639.6
Logical reads: 112,042.4 181.1
Block changes: 10,777.0 17.4
Physical reads: 286.1 0.5
Physical writes: 174.2 0.3
User calls: 105.3 0.2
Parses: 1,172.9 1.9
Hard parses: 30.2 0.1
W/A MB processed: 11.0 0.0
Logons: 0.8 0.0
Executes: 8,386.1 13.6
Rollbacks: 0.1 0.0
Transactions: 618.7[/code]
Top events:
Avg
wait % DB
Event Waits Time(s) (ms) time Wait Class
DB CPU 7,215 14.1
db file sequential read 882,357 2,914 3 5.7 User I/O
resmgr:cpu quantum 406,418 1,915 5 3.7 Scheduler
buffer busy waits 192,071 466 2 .9 Concurrenc
gc cr grant 2-way 253,278 298 1 .6 Cluster[/code]
Host CPU (CPUs: 6 Cores: 3 Sockets: )
~~~~~~~~ Load Average
Begin End %User %System %WIO %Idle
14.23 5.11 58.5 18.0 1.9 23.5[/code]
Is this a standard one-hour report, and does it cross the peak hour of the graph you published, and is it for the same node ?
There are several anomalies here, not the least of which is that your event percentages don't get close to 100%.
To me the thing that really stands out as a possible source of your problems is the 8,386 executions per second - if there has been a recent dramatic change in performance, it may be related to this.
I'd be taking a quick look at the SQL ordered by CPU and SQL ordered by Executions sections of the report for any clues.
I'd also be cross checking the Time model and OS statistics, and instance activity CPU details to see if they were consistent with the Event figures.
Regards
Jonathan Lewis
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Attachments:
Performance Log 020114_095115.png 82 KBHello,
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