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High run queue, high idle cpu percentage

I have 4-way where vmstat is showing high run queues, but also showing
high idle cpu precentage.  The rest of the values appear nominal.  Any
thoughts?

vmstat 5 | sed '1,20d'

kthr     memory             page              faults        cpu     
----- ----------- ------------------------ ------------ -----------
 r  b   avm   fre  re  pi  po  fr   sr  cy  in   sy  cs us sy id wa 
14  0 2232991 1471674   0   0   0   0    0   0 617 10137 554  4  1 94 
1
 1  0 2236672 1467938   0   0   0   0    0   0 670 3745 774  6  1 92 
1
 5  0 2234160 1470396   0   0   0   0    0   0 538 2408 440 12  1 87 
1
15  0 2238494 1466033   0   0   0   0    0   0 771 6881 1072  8  4 87 
1
 1  0 2241770 1462696   0   0   0   0    0   0 753 5515 968  2  2 95 
1
 1  1 2240780 1463595   0   0   0   0    0   0 732 3138 857  1  1 96 
2
 9  1 2237011 1467354   0   0   0   0    0   0 695 3280 725  1  2 96 
1
 1  0 2242552 1461806   0   0   0   0    0   0 725 5188 861  2  2 95 
1
 1  0 2240229 1464115   0   0   0   0    0   0 558 1725 418  5  1 94 
1
0
google (9)
6/30/2004 6:10:17 PM
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tcarroll+google@chimesnet.com (Tom Carroll) wrote in message news:<dcb3aac0.0406301010.1ccd5157@posting.google.com>...
> I have 4-way where vmstat is showing high run queues, but also showing
> high idle cpu precentage.  The rest of the values appear nominal.  Any
> thoughts?
> 
> vmstat 5 | sed '1,20d'
> 
> kthr     memory             page              faults        cpu     
> ----- ----------- ------------------------ ------------ -----------
>  r  b   avm   fre  re  pi  po  fr   sr  cy  in   sy  cs us sy id wa 
> 14  0 2232991 1471674   0   0   0   0    0   0 617 10137 554  4  1 94 
> 1
>  1  0 2236672 1467938   0   0   0   0    0   0 670 3745 774  6  1 92 
> 1
>  5  0 2234160 1470396   0   0   0   0    0   0 538 2408 440 12  1 87 
> 1
> 15  0 2238494 1466033   0   0   0   0    0   0 771 6881 1072  8  4 87 
> 1
>  1  0 2241770 1462696   0   0   0   0    0   0 753 5515 968  2  2 95 
> 1
>  1  1 2240780 1463595   0   0   0   0    0   0 732 3138 857  1  1 96 
> 2
>  9  1 2237011 1467354   0   0   0   0    0   0 695 3280 725  1  2 96 
> 1
>  1  0 2242552 1461806   0   0   0   0    0   0 725 5188 861  2  2 95 
> 1
>  1  0 2240229 1464115   0   0   0   0    0   0 558 1725 418  5  1 94 
> 1


run pprof to see whats runnable and whats being forked ...

Rgds
Mark Taylor
0
mky (755)
7/1/2004 10:26:28 AM
Ummm that isn't your idle at 80's and 90's that is your wait on IO.
You have a disk issue, a big one.



tcarroll+google@chimesnet.com (Tom Carroll) wrote in message news:<dcb3aac0.0406301010.1ccd5157@posting.google.com>...
> I have 4-way where vmstat is showing high run queues, but also showing
> high idle cpu precentage.  The rest of the values appear nominal.  Any
> thoughts?
> 
> vmstat 5 | sed '1,20d'
> 
> kthr     memory             page              faults        cpu     
> ----- ----------- ------------------------ ------------ -----------
>  r  b   avm   fre  re  pi  po  fr   sr  cy  in   sy  cs us sy id wa 
> 14  0 2232991 1471674   0   0   0   0    0   0 617 10137 554  4  1 94 
> 1
>  1  0 2236672 1467938   0   0   0   0    0   0 670 3745 774  6  1 92 
> 1
>  5  0 2234160 1470396   0   0   0   0    0   0 538 2408 440 12  1 87 
> 1
> 15  0 2238494 1466033   0   0   0   0    0   0 771 6881 1072  8  4 87 
> 1
>  1  0 2241770 1462696   0   0   0   0    0   0 753 5515 968  2  2 95 
> 1
>  1  1 2240780 1463595   0   0   0   0    0   0 732 3138 857  1  1 96 
> 2
>  9  1 2237011 1467354   0   0   0   0    0   0 695 3280 725  1  2 96 
> 1
>  1  0 2242552 1461806   0   0   0   0    0   0 725 5188 861  2  2 95 
> 1
>  1  0 2240229 1464115   0   0   0   0    0   0 558 1725 418  5  1 94 
> 1
0
mduval1 (3)
7/2/2004 2:26:06 AM
Nevermind! Just saw the 1 wrap around on the new line



tcarroll+google@chimesnet.com (Tom Carroll) wrote in message news:<dcb3aac0.0406301010.1ccd5157@posting.google.com>...
> I have 4-way where vmstat is showing high run queues, but also showing
> high idle cpu precentage.  The rest of the values appear nominal.  Any
> thoughts?
> 
> vmstat 5 | sed '1,20d'
> 
> kthr     memory             page              faults        cpu     
> ----- ----------- ------------------------ ------------ -----------
>  r  b   avm   fre  re  pi  po  fr   sr  cy  in   sy  cs us sy id wa 
> 14  0 2232991 1471674   0   0   0   0    0   0 617 10137 554  4  1 94 
> 1
>  1  0 2236672 1467938   0   0   0   0    0   0 670 3745 774  6  1 92 
> 1
>  5  0 2234160 1470396   0   0   0   0    0   0 538 2408 440 12  1 87 
> 1
> 15  0 2238494 1466033   0   0   0   0    0   0 771 6881 1072  8  4 87 
> 1
>  1  0 2241770 1462696   0   0   0   0    0   0 753 5515 968  2  2 95 
> 1
>  1  1 2240780 1463595   0   0   0   0    0   0 732 3138 857  1  1 96 
> 2
>  9  1 2237011 1467354   0   0   0   0    0   0 695 3280 725  1  2 96 
> 1
>  1  0 2242552 1461806   0   0   0   0    0   0 725 5188 861  2  2 95 
> 1
>  1  0 2240229 1464115   0   0   0   0    0   0 558 1725 418  5  1 94 
> 1
0
mduval1 (3)
7/2/2004 2:28:29 AM
Reply:

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High CPU in tasking
In order to stop others falling into the same mistake, I debugged several days. I wrote an data stream decoder and output (via TCP) manifolder using Ada tasking and a protected ringbuffer. The whole application word fine, but the CPU load increased linear on input load and dramatically over the number of output queues. Debugging turned out: - Every writing to the ringbuffer wakes up all reader tasks. - That's why the reader buffers were filled with only the little data amount just written. - Tasking overhead caused the CPU load. Two solutions (used both): - The ringbuffer got a minimum reading length => Fewer wakeups. - The writer task collect a lot of data before writing => Fewer checks for wakeup. The ratio of tasking events before and after the change is about 30:1. Conclusion: When implementing tasking synchonisation with protected objects, keep in mind, that the standard Ada tasking model generates a near real time experience, which is mostly not required. HTH "Lutz Donnerhacke" <lutz@iks-jena.de> wrote in message news:slrncdltli.nr.lutz@taranis.iks-jena.de... > In order to stop others falling into the same mistake, I debugged > several days. > ... I'm obviously only guessing at the details of your application, Lutz, but gleaning what I can, I'm surprised that you seem to be talking about one buffer. Do you not have a separate buffer for each reader (of a single demultiplexed stream)? Also, what ...

Web resources about - High run queue, high idle cpu percentage - comp.unix.aix

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