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| Qmgr Sequential write to log? |
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| angka |
 Posted: Wed Jan 30, 2013 7:33 pm Post subject: Qmgr Sequential write to log? |
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Chevalier
Joined: 20 Sep 2005
Posts: 406
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Hi,
Is there only one qmgr process writing to the log for persistent message? if so, which means even if there is a high speed i/o disk inplace, it still depend mainly on how fast the single process can write?
Thanks. |
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| jeevan |
| Posted: Wed Jan 30, 2013 9:01 pm Post subject: Re: Qmgr Sequential write to log? |
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Grand Master
Joined: 12 Nov 2005
Posts: 1432
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| angka wrote: |
Hi,
Is there only one qmgr process writing to the log for persistent message? if so, which means even if there is a high speed i/o disk inplace, it still depend mainly on how fast the single process can write?
Thanks. |
I can not tell u whether qmgr generates many threads for writing the incoming persistent message, but what I can tell u is that a process is not equivalent thread. A process can have many thread inside it.
Also, I have not have any experiences that the qmgr is not able to write the incoming message fast enough and the inputing app has to wait. |
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| angka |
| Posted: Thu Jan 31, 2013 5:58 pm Post subject: |
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Chevalier
Joined: 20 Sep 2005
Posts: 406
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Hi,
I understand a process is not equivalent to thread. But I dun remember seeing MQ writing to different MQ log at the same time. The process or thread will definitely need to lock the MQ log when it is writing.
I am doing some performance tuning as i am expecting alot of big persistence messages arriving at the qmgr at the same time. thus i need to understand the behaviour. thanks |
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