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| very slow message flow |
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| Warrior_Archangel |
 Posted: Mon Jul 20, 2015 2:13 am Post subject: very slow message flow |
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Newbie
Joined: 15 Jun 2015
Posts: 3
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Hi All,
I have a very slow message flow causing timeouts.
This message flow is returning response in local machine under 0.5 secs, but in dev server its takes about 6 secs (aprox).
I am using statistics and accounting data and there I see the Average elapsed time is high and the Average CPU time is low. which means the flow is waiting for something other than CPU. We have verified, that the backend is not causing this issue.
Can it be a case of JVM issue as dev servers are very busy often ? As there are logging commands which write to file from JCN..
need some guidance on this .. |
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| smdavies99 |
| Posted: Mon Jul 20, 2015 2:38 am Post subject: |
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Jedi Council
Joined: 10 Feb 2003
Posts: 6076
Location: Somewhere over the Rainbow this side of Never-never land.
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simples,
Throw everyone off the DEV server (tell them to go to Lunch) and stop as much other stuff as possible. By that I mean stop all the flows on the broker apart from the ones toy want to test.
Then run your tests again. With the servers no 'not busy' you should get a better idea of the performance.
Then run the tests again with Logging switched off. After all, you are going to be running with them OFF when it gets to production aren't you?
_________________
WMQ User since 1999
MQSI/WBI/WMB/'Thingy' User since 2002
Linux user since 1995
Every time you reinvent the wheel the more square it gets (anon). If in doubt think and investigate before you ask silly questions. |
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| inMo |
| Posted: Wed Jul 22, 2015 10:39 am Post subject: |
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Master
Joined: 27 Jun 2009
Posts: 216
Location: NY
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Your local is your dedicated environment, correct? What is the DEV environment - is it a dedicated DEV box or a virtual?
Do any other flows see a performance hit when moving from local to DEV? |
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| fjb_saper |
| Posted: Wed Jul 22, 2015 11:23 am Post subject: Re: very slow message flow |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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| Warrior_Archangel wrote: |
Hi All,
I have a very slow message flow causing timeouts.
This message flow is returning response in local machine under 0.5 secs, but in dev server its takes about 6 secs (aprox).
I am using statistics and accounting data and there I see the Average elapsed time is high and the Average CPU time is low. which means the flow is waiting for something other than CPU. We have verified, that the backend is not causing this issue.
Can it be a case of JVM issue as dev servers are very busy often ? As there are logging commands which write to file from JCN..
need some guidance on this .. |
You say you have verified that the backend is not causing the issue: how so? Meaning how did you verify?
- Assumption: The backend takes in average 500 ms to process a request.
If you have requests happening every 100 ms the back end may processing so ever fine it wants, it is still the bottleneck!!
- Assumption: The backend takes 50 ms in average to process a request but the round trip from broker to backend and back (including the 50 ms processing time) takes 500 ms (network latency and such)... Again the bottleneck is the backend call. In fact here the backend is within SLA but the network is at fault. Same end result...
- Assumption: Your dev box is not CPU bound, neither is it IO bound, but it appears to be Disk bound... Did you allocate enough memory or is it paging (hence disk activity)???
- Assumption: You are logging to disk in your DEV Box. Is that disk on a fast SAN or does it take time... How fast can you write 1 GB of data to the disk on your DEV box vs your local machine??
So you have a lot more to look into and need to pinpoint your bottleneck.
Have fun 
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