onstat -g qst command: Print wait options for mutex and condition queues

Use the onstat -g qst command to display the wait statistics for mutex queues and condition queues (queues of waiters for a mutex or a condition).

The QSTATS configuration parameter must be set to 1 to enable the collection of statistics. For more information, see QSTATS configuration parameter.


Syntax:

>>-onstat-- -g--qst--------------------------------------------><

Example output

Figure 1. onstat -g qst command output

Mutex Queue Statistics
name     nwaits   avg_time max_time avgq maxq nservs   avg_time

ddh chai 1        1354863  1354863  1    1    56       1690    

Condition Queue Statistics
name     nwaits   avg_time max_time avgq maxq nservs   avg_time

arrived  1        110008   110008   1    1    0        0
logbf0   21       642      4431     1    2    0        0       
logbf1   15       475      2519     1    2    0        0       
logbf2   19       596      3274     1    2    0        0       
bp_cond  1        0        0        1    1    0        0

Output description

name (string): Name of the mutex or condition resource being waited for
nwaits (decimal): Number of times this resource was waited for
avg_time (decimal): Average time spent waiting (in microseconds)
max_time (decimal): Maximum time spent waiting (in microseconds)
avgq (decimal): Average length of the queue
maxq (decimal): Maximum length of the queue
nservs (decimal): Number of times this resource was acquired
avg_time (decimal, microsecond): Average time the resource was held per acquisition (in microseconds)