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| MQ Clients, slow MQConn() after 3000 |
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| sebastia |
 Posted: Sun Apr 29, 2007 12:42 am Post subject: MQ Clients, slow MQConn() after 3000 |
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Grand Master
Joined: 07 Oct 2004
Posts: 1003
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We shall have thousands of MQ Clients on Guindous machines
connecting to a MQ Server on an HP-UX machine.
We are testing 4 seconds response time when first 2000+ clients
do MQConn() to the Server,
and then, when over 3000 or 3100 connections,
the response time jumps into 20+ seconds range.
HP-UX Kernel has "NCALLOUT kernel parameter" set to 40.000
Any other idea ? |
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| fjb_saper |
| Posted: Sun Apr 29, 2007 4:31 am Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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Have you checked if the box is IO bound or the net is hitting band saturation? 
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| jefflowrey |
| Posted: Sun Apr 29, 2007 5:56 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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Put up another listener, see if splitting the clients that way helps.
Ensure that you've set the necessary kernel parameters to allow for the necessary number of channel agent processes to start to allow for the necessary number of channel agent threads.
Confirm that you aren't seeing excessive paging.
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| sebastia |
| Posted: Mon Apr 30, 2007 2:07 am Post subject: |
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Grand Master
Joined: 07 Oct 2004
Posts: 1003
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mr Saper - what do you mean by "IO bound" (just english-related question)
Net saturation : I will try to measure this ...
mr Jeff : yes, I will try another listener, and measure "paging", too.
Thanks a lot. |
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| Vitor |
| Posted: Mon Apr 30, 2007 3:50 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| sebastia wrote: |
| mr Saper - what do you mean by "IO bound" (just english-related question) |
I/O Bound = maximum speed of process limited by disk access delays (file or database reading/writing)
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Honesty is the best policy.
Insanity is the best defence. |
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| fjb_saper |
| Posted: Mon Apr 30, 2007 9:20 am Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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| Vitor wrote: |
| sebastia wrote: |
| mr Saper - what do you mean by "IO bound" (just english-related question) |
I/O Bound = maximum speed of process limited by disk access delays (file or database reading/writing) |
Not just disk access. Any input / output operation.
This includes network.
a) assumptions:
let's say you have 2 cards in your box.
One for 100MB/s and one for 1GB/s.
You think you are routing through the 1GB/s card but in fact you are using the 100MB/s card.
b)fact:
If the volume you are trying to push through that 100MB/s card is consequential enough (> 100 MB/s) you are I/O bound...
If your computer memory / data bus cannot handle more than 100MB/s, no matter which card you are using you are I/O bound....
You are bound by the slowest I/O capability of the chain in your transport.
That could be network bandwidth, I/O capabilities of the diverse network and cpu hardware and software components, disk I/O, etc ....
Enjoy
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