Notification Threads
A SpectroSERVER process called the Notification Manager reads attribute
changes received from polled devices and then runs inference handlers to
process this data. Another SpectroSERVER process called the Poll
Manager is responsible for detecting changes in an attribute.
When a change in an attribute value is detected, the Poll Manager alerts
the Notification Manager and the Notification Manager forwards the
events to each registered inference handler.
Notification threads are the mechanism used to notify inference handlers
of a change in an attribute. Notification threads are used to run the
trig_attr_change and trig_watch_change inference handler methods.
Both of these methods are notifications of attribute value changes.
For example: the ifInDiscards attribute has changed from a count of
110 to 150. The SpectroSERVER sends a notification thread to the
inference handler that has expressed an interest in this attribute. The
inference handler then runs the trig_attr_change method
Thank you - Ali
________________________________
From: Lalit Tyagi [mailto:[email protected]]
Sent: Thursday, March 04, 2010 11:12 AM
To: spectrum
Subject: RE: [spectrum] Spectrum Latenecy
You are right, my notification thread is maxed out which is 100. Do you know by
chance what "Notification Thread" means and what causes spectrum to increase
this number?
From: HUNGERFORD, CLIFF [AG/1000] [mailto:[email protected]]
Sent: Thursday, March 04, 2010 10:06 AM
To: Lalit Tyagi
Subject: RE: [spectrum] Spectrum Latenecy
The first place I would check is to make sure your notification threads aren't
being maxed out. You can see this under the Information tab for the
SpectroSERVER model in OneClick. I have my available notification threads set
to 600; I believe the default setting is somewhere around 100. You may have to
increase your total pool of available threads, and be sure to keep a careful
watch on your CPUs after adding available threads, to ensure you don't overtax
the CPU.
Also, check to make sure that there isn't an old process still running that
shouldn't be. Are you running Windows or Unix/Linux?
From: Lalit Tyagi [mailto:[email protected]]
Sent: Thursday, March 04, 2010 8:41 AM
To: spectrum
Subject: [spectrum] Spectrum Latenecy
Hi List,
We are using spectrum 8.1 (SP2) in our environment. Last week, spectrum was
crashed and then we restarted spectrum server. Since then, spectrum working
fine but having lot of delays in discovery any device, putting device in
maintenance or getting device unreachable alarm.
I have checked SS Performance table which shows Notification Latency around 800
sec.
Does any one faces this problem? Any idea, how could I possibly check why
spectrum having so much delays?
Thanks
Lalit
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