[Opensim-dev] New Network Statistics

Fri Jun 26 22:41:21 UTC 2015

Thanks to you folks for all the work you are doing. I'm sure it will turn
into a better OpenSim experience for everyone.

I have a question about the viewer stats as they exist now. I noticed in
the viewer (Singularity) that Time Dilation as displayed in the viewer
stats display seems to have a binary mode; it's either 1.0 for any sim or
physics frame rate greater than zero, or 0.0 if the frame rate falls to
zero. Should it be binary or continuous? I believe the value in SL is
continuous between 0.0-1.0 and I thought OpenSim was also.

On Fri, Jun 19, 2015 at 9:06 AM, Sean M <mondesire.sean at gmail.com> wrote:

> Greetings,
> The MOSES Team has completed work on adding more network-based statistics
> gathering to OpenSim. With these changes, you will be able to accurately
> determine, through the JSON SimStats, how your simulator is performing
> network-wise with measures in packets, bytes, queue size, and latency.
> Particularly with the latency measures, we have added variables to the
> OpenSim.ini file (specified below) to allow you to turn these features on
> and off (off by default). Furthermore, we have added IP-to-avatar tracking
> that is outputted via a new JSON output stream (specified below).
>
> The statistics work is available on our GitHub repo, where you may pull
> from:
>
> https://github.com/M-O-S-E-S/opensim
>
> Below are details of each of the modified and newly added statistics.
> *Network Statistics*
>
>
>
> *PktsIn – *Now the number of packets received are averaged inside the
> LLUDPClient before being sent to the SimStatsReporter. The time is
> calculated using a stopwatch. This is done to enforce an accurate
> measurement since the SimStatsReporter and the UDP message system are
> running on separate threads. The stat is reported as the number of packets
> per second.
>
>
> *PktsOut -* Now the number of packets sent are averaged inside the
> LLUDPClient before being sent to the SimStatsReporter. The time is
> calculated using a stopwatch. This is done to enforce an accurate
> measurement since the SimStatsReporter and the UDP message system are
> running on separate threads. The stat is reported as the number of packets
> per second.
>
>
> *UDPIn –* This is the same as PktsIn except that it tracks the number of
> bytes being received instead of the number of packets.
>
>
> *UDPOut –* This is the same as PktsOut except that it tracks the number
> of bytes being sent instead of the number of packets.
>
>
> *UDPInError –* Tracks the number of packets that are sent to
> RecordMalformedInboundPacket. Then divides by the time in the UDPClient
> before sending the average number of packets that were malformed to the
> SimStatsReporter. The stat is reported as the number of packets per second.
>
>
> *ClientPing –* Average ping between OpenSim and a subset of its connected
> users. This will show a value of -1 if the ping reply status was not
> successful. A non-successful status may vary (e.g. Timeout, time limit
> exceeded, firewall issues). Check C#'s IPStatus class for more information
> on the various states:
> https://msdn.microsoft.com/en-us/library/system.net.networkinformation.ipstatus(v=vs.110).aspx
>
>
> *AvgPing –* Average ping to an external server. This will show a value of
> -1 if the ping reply status was not successful. A non-successful status may
> vary (e.g. Timeout, time limit exceeded, firewall issues). Check C#'s
> IPStatus class for more information on the various states:
> https://msdn.microsoft.com/en-us/library/system.net.networkinformation.ipstatus(v=vs.110).aspx
>
> *NetFT *– Split into 2 statistics which are NetEvtTime and NetQSize.
>
>
> *NetEvtTime *– This is acquired inside the LLUDPServer class inside the
> IncomingPacketHandler. This records the time it took each time a packet is
> processed then divides by the number of packets. This is a moving average
> over N number of packets. Where N is equal to the number of frames being
> stored for Total, Simulation, and Physics frame time.
>
>
> *NetQSize *– This is acquired at the same time as NetEvtTime. This is the
> size of the queue that is left to be processed. This is also a moving
> average based on N, where N is equal to the number of frames being stored
> for Total, Simulation, and Physics frame time.
>
>
> *Client IP Addresses *– This is a list of clients and their IP Addresses.
> In order to access the list use the address format as follows
>
>                 [Server IP address]:[Port number]/[Custom URI name]
>
> The default using the value in the example of Agent_Stats_URI would be
>
>                 127.0.0.1:9000/jsonUserStats
>
>
> *OpenSim.ini Changes*
>
>
>
> The subheadings in this section correspond with the Sections inside of the
> OpenSim.ini file.
>
>
> Startup
>
>
>
> *Agent_Stats_URI – *Provides the web URI that will allow the developer to
> access the current clients and there IP Addresses. An example is
>
>     ; Agent Login Stats URI
>
>     ; Enable JSON agent data by setting a URI name (case sensitive)
>
>     ; Returns regular agent stats (Name, IPAddress, Login)
>
>     Agent_Stats_URI = "jsonUserStats"
>
>
>
>
> Statistics
>
>
>
> *NumberOfFrames* – This is the number of frames or packets that will be
> held onto and then averaged for total frame time, simulation frame time,
> physics frame time, NetEvtTime, and NetQSize.
>
> *ClientPingSubset – *This is an integer that defaults to 1. It is the
> number of clients that will be pinged to create an average ping rate. This
> is done as a subset of the total number of clients.
>
> *ClientPingFrequency – *The frequency with which we ping the client. This
> value is in seconds.
>
> *ExternalServer – *Address of the external server to be pinged.
>
> *ExternalPingFrequency – *The frequency with which we ping the external
> server. This value is in seconds.
>
> *PingExternalServerEnabled – *A flag that tells opensim whether it should
> be pinging the external server.
>
> *PingClientEnabled – *A flag that tells opensim whether it should be
> pinging the clients.
>
> *StatsUpdateEveryMS – *An integer that will control how often the
> SimStatsReporter heartbeat will run for. This value should be given in
> milliseconds.
>
>
>
> Best regards,
>
> Sean Mondesire, Ph.D.
>
> MOSES Team
>
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>
>
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