I downloaded the source of 5.7.2~dfsg-8.1ubuntu3 and edited my debian/rules
such that net-snmp would build with the following parameters:
--with-out-mib-modules="host/data_access/swrun host/hrSWRunTable
host/hrSWRunPerfTable"
--with-mib-modules="smux ucd-snmp/dlmod mibII/mta_sendmail
disman/event-mib host/hr_swrun"
It seems there's some dependency issue:
*** MIB Module warning *** mib module 'host' requires module
'host/hrSWRunTable' but someone told me to compile without it
Still, while running this version I do get the desired values when reading
from the hrSWRunPerfTable.
Am I heading in the right direction or will I break other stuff by
compiling with these flags?
Thanks
On Mon, Feb 23, 2015 at 11:27 AM, Vincent Newell <vince.new...@gmail.com>
wrote:
> Shoot, sorry about the duplicate - I thought the first message didn't go
> through.
>
> On Mon, Feb 23, 2015 at 11:25 AM, Vincent Newell <vince.new...@gmail.com>
> wrote:
>
>> Greetings,
>>
>> I have a small LAN of four systems for which I would like to monitor
>> specific processes' CPU and Memory utilization. I am able to determine the
>> PID and host on which each process is running so I would like to use SNMP
>> to make the actual queries for resource utilization. For Ubuntu 12.04 with
>> net-snmp 5.4.3, I wrote some software to find all of the processes (using
>> ROS), and dispatch SNMP queries and track performance using
>> HOST-RESOURCES-MIB::hrSWRunPerfCPU.<pid> and
>> HOST-RESOURCES-MIB::hrSWRunPerfMem. Each data point combines a timestamp
>> with an identifier and the encoded varbind. The data is passed through
>> some complicated system and, long story short, ends up in graphite. Using
>> the nonNegativeDerivative and scaleToSeconds functions, I created a CPU
>> graph to track all of the processes. Computation-heavy single-threaded
>> processes were hovering around 100%, so I think I did everything right.
>>
>> I recently upgraded the systems to 14.04 and net-snmp 5.7.2 and noticed
>> that my data points were alternating between 0 and 200% ... I took a closer
>> look by launching 'yes' in the background, and comparing 5.4.3 and 5.7.2
>> with:
>>
>> watch -d "snmpget -v2c -c public localhost
>> HOST-RESOURCES-MIB::hrSWRunPerfCPU.6650"
>>
>> I found that net-snmp 5.4.3 would update every time I made the request,
>> net-snmp 5.7.2 was behaving more like a step function. I used strace and
>> fond that net-snmp 5.4.3 reads /proc/6650/stat each time it's queried while
>> 5.7.2 will read all of /proc/*/stat into memory every 30 seconds, and
>> respond to queries with the latest value. That made sense based on my
>> results because my original query interval was 15 seconds, so I would see
>> zero change in the hrSWRunPerfCPU every other time I queried.
>>
>> Is there any way I can get net-snmp 5.7.2's process table to actually
>> check the procfs rather than reading from memory, or should I just make 30
>> seconds the minimum resolution/interval in my data?
>>
>> Regards,
>> Vince
>>
>
>
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