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| zafire |
 Posted: Tue Sep 29, 2015 8:02 pm Post subject: Performance issue when using QLOAD over VPN |
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Newbie
Joined: 29 Sep 2015
Posts: 3
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Hi all.
I am using the qload script for a number of connections to MQ servers.
However, for one of my connections (across a wide area network VPN) I am seeing really slow performance, only a few hundred bytes per second, as opposed to 100k per second on other connections. I am using the same qload script on the same server, it is just the remote MQ servers that are different.
I added a "-p" option, for purge, to qload and it made an improvement, but only really doubled the performance.
Sample command:
/opt/mqm/qload -m xxx -I yyy -f MSG/MSG_%C_%t_%I -d A -r#1000
and
/opt/mqm/qload -m xxx -I yyy -f MSG/MSG_%C_%t_%I -d A -r#1000 -p
Has anyone else had poor performance when using qload over a VPN?
Thanks,
Mark |
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| zpat |
| Posted: Tue Sep 29, 2015 10:03 pm Post subject: |
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Jedi Council
Joined: 19 May 2001
Posts: 5866
Location: UK
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How many messages, what size are they?
_________________
Well, I don't think there is any question about it. It can only be attributable to human error. This sort of thing has cropped up before, and it has always been due to human error. |
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| zafire |
| Posted: Tue Sep 29, 2015 10:12 pm Post subject: |
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Newbie
Joined: 29 Sep 2015
Posts: 3
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Hi.
There are 1000's of messages in the queue, each is about a few hundred bytes long.
Thanks,
Mark |
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| Vitor |
| Posted: Wed Sep 30, 2015 2:20 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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Does your VPN otherwise perform normally?
Is it configured for the kind of stream traffic qload will put down it as opposed to (for example) updates and exchanges between mail client & mail server, or web pages from an internal application?
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| zpat |
| Posted: Wed Sep 30, 2015 2:53 am Post subject: |
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Jedi Council
Joined: 19 May 2001
Posts: 5866
Location: UK
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Possibly adjusting the -t parameter might make some difference.
However, if you purchase the supported version, it now has a read-ahead option for faster performance over client connections.
http://www.mqgem.com/qload.html
Or for comparison you could try the new IBM MQ v8 version called dmpmqmsg
_________________
Well, I don't think there is any question about it. It can only be attributable to human error. This sort of thing has cropped up before, and it has always been due to human error. |
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| PaulClarke |
| Posted: Thu Oct 01, 2015 12:11 pm Post subject: |
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Grand Master
Joined: 17 Nov 2005
Posts: 1002
Location: New Zealand
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Hi,
I would be happy to send you a trial licence if you would like to see whether the read-ahead option significantly improves thing. Certainly if there is a long latency on your network then one would expect it to. With such small messages the round-trip hit per message is going to be significant.
If this isn't the problem then I am happy to work through it with you and see whether we can modify QLOAD in some way to tune it better for your environment,
Regards,
Paul.
_________________
Paul Clarke
MQGem Software
www.mqgem.com |
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| zafire |
| Posted: Wed Oct 07, 2015 4:28 pm Post subject: |
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Newbie
Joined: 29 Sep 2015
Posts: 3
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Hi Paul, thanks for replying.
If you could let me have a trial licence, that would be fantastic.
We have managed to improve performance using the "-p" to purge switch, but are not sure what the knock on effects of that are?
But, if the new version is more aligned to remote client access, then please send through the trail version.
Many thanks,
Mark |
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| hughson |
| Posted: Thu Oct 08, 2015 9:29 pm Post subject: |
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Padawan
Joined: 09 May 2013
Posts: 1959
Location: Bay of Plenty, New Zealand
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Hi zafire,
Paul will need your email address to send the trial license to. Suggest you drop him a line at support@mqgem.com rather than publishing your own email on here.
Cheers
Morag
_________________
Morag Hughson @MoragHughson
IBM MQ Technical Education Specialist
Get your IBM MQ training here!
MQGem Software |
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