Question on r-queue from vmstat out


 
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Operating Systems AIX Question on r-queue from vmstat out
# 1  
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 09:38 PM.. Reason: Add CODE tags.
# 2  
Old 05-22-2015
It just means that in that partical time time interval there were no running kernel threads and no runnable threads in the queue.. Maybe your production server has more CPU power ?
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