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Full Discussion: Question on r-queue from vmstat out
Operating Systems AIX Question on r-queue from vmstat out Post 302944778 by aixusrsys on Thursday 21st of May 2015 07:15:38 PM
Old 05-21-2015
Question on r-queue from vmstat out
On our prod system we found sometime runqueue goes back to 0 as below.
Whereas on test server even with very very less work the r-queue never dropped to 0. Under what conditions r-queue drops to 0? Does it mean something unusual?

EG:
Code:
kthr    memory              page              faults        cpu       time  
----- ----------- ------------------------ ------------ ----------- --------
 r  b   avm   fre  re  pi  po  fr   sr  cy  in   sy  cs us sy id wa hr mi se
34  1 13835500 10722093   0   0   0   0    0   0 28363 2161527 1238371 32 13 54  1 14:32:32
 0  0 13835499 10724861   0   0   0   0    0   0 29293 2193173 1270468 32 13 54  1 14:32:33
46  1 13835579 10722439   0   0   0   0    0   0 35177 2227830 1281512 32 14 52  1 14:32:34
51  1 13839891 10715264   0   0   0   0    0   0 36033 2197365 1260147 32 14 53  1 14:32:35
39  0 13836019 10704067   0   0   0   0    0   0 26299 2099856 1193925 33 12 53  1 14:32:44
52  0 13837041 10701105   0   0   0   0    0   0 27404 2111910 1214185 33 13 53  1 14:32:45
52  0 13835500 10700436   0   0   0   0    0   0 28626 2115914 1201534 33 13 53  1 14:32:46
 0  0 13835500 10698285   0   0   0   0    0   0 33106 2004892 1146048 33 13 53  1 14:32:47
38  0 13835500 10696398   0   0   0   0    0   0 32200 2061235 1191873 32 13 53  1 14:32:48
68  0 13840540 10689303   0   0   0   0    0   0 35244 2049575 1180571 31 13 54  2 14:32:49

Last edited by Don Cragun; 05-21-2015 at 08:38 PM.. Reason: Add CODE tags.
 

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LEARN ABOUT OSF1

canput

canput(9r)																canput(9r)

NAME

       canput - STREAMS: Tests for room in a message queue

SYNOPSIS

       #include <sys/stream.h>

       int canput(
	       queue_t *message_queue );

ARGUMENTS

       Specifies a pointer to the message queue. The typedef queue_t is an alternate name for struct queue_entry *.

DESCRIPTION

       The  canput interface searches through the stream (starting at the message queue identified by the message_queue argument) until it finds a
       queue that contains a service interface where the message can be enqueued or until it reaches the end of the stream.   If  canput  finds  a
       service	interface  in  a  queue, it tests the queue to determine if there is space in the queue to accommodate a message.  If the queue is
       full, canput sets the q_flag member of the queue_entry structure pointer (the message queue) to the  constant  QWANTW  to  back-enable  the
       caller's service interface.

NOTES

       You are responsible for both testing a queue with canput and not placing a message on the queue if canput fails.

RETURN VALUES

       The canput interface returns a value of 1 if the message queue is not full. It returns the value zero(0) if the message queue is full.

SEE ALSO

       Kernel Interfaces: bcanput(9r), putbq(9r), putnext(9r)

       Programmer's Guide: STREAMS

																	canput(9r)
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