Hi Nigel,
On Ubuntu I suspect that the agent is a NET-SNMP agent. It is then NOT
multi-threaded.
Thus, you will get worse performance than expected if you concurrently
access the same
agent with multiple-threads.
Best regards,
Frank
Am 19.06.2014 20:41, schrieb Nigel Thomas:
Frank
The client is mine. There is no separate agent - I am directly
addressing snmpd in ubuntu (on localhost at present, though eventually
it will be monitoring a distributed application running on a handful
of local servers). Traffic level should be reasonable - polling
hrStorageTable and hrSWRunTable every 30 seconds.
I will investigate timeout changes tomorrow. Thanks and any more
suggestions always welcome
Regards Nigel
On 19 June 2014 19:30, Frank Fock <[email protected]
<mailto:[email protected]>> wrote:
Hi Nigel,
Your setup is absolutely fine and the recommended one for that task.
Have you checked that the agent isn't the problem?
Agents (except AGENT++ and SNMP4J-Agent based) are often single
threaded and many do not implement thread safe lexicographic ordering
correctly.
Also check the timeout values, because the agent will need more than
twice the time if polled concurrently from two threads (if not
multi-threaded).
Best regards,
Frank
Am 19.06.2014 19:32, schrieb Nigel Thomas:
Hi
I have a system with multiple threads getting different SNMP
subtrees from
the same target server concurrently using
TreeUtils.getSubtree. One thread
alone seems to work exactly as expected, but when a second
thread starts up
the two get confused; the first table receives no data.
Clearly I am having some sort of thread safety problem - but
with which
object/method? I am using
- a singleton instance of Snmp
- a single instance of CommunityTarget (for each monitored
server -
currently just localhost)
- therefore a single instance of TransportMapping - a
DefaultUdpTransportMapping; I have tried
setAsyncMsgProcessingSupported(true)
- a separate instance of TreeUtils per thread
- SNMPv2
- snmp4j-2.3.0
Any thoughts would be very welcome
TIA
Nigel
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