[ANSS-netops] rtpd max clients [Memphis]

[Mike Hagerty]

I just wanted to concur: I've been running an rtpd server for 5+  
years and it's
been very reliable - I've encountered very few problems and it seems to
put only a small load on the computer (an older Sun).

-Mike Hagerty
  New England Seismic Network

On May 12, 2010, at 6:14 PM, Ian Billings wrote:

> Mitch,
>
> We were waiting to reply to this email in case others may have had  
> some
> input so we could learn some more about how users not only use our
> software but how users would like to see our software perform.
>
> It is recommended that the latest RTPD version and data clients are
> used.  REF TEK sends a notification to users registered on our
> http://support.reftek.com site when new versions are available, or
> alternatively one can check the site, on regular basis, for updates.
>
> The rtpd.ini file entry for Max Clients relates to data clients like
> RT_Display, RTPC etc.  It does not relate to RTP (130 or 72A)
> connections or the Archive connection.  RTP connections have priority
> over Client connections therefore always serviced first.  The Archive
> thread, if present, is also of similar priority to RTP  
> connections.  The
> RTP/RTPD connection is full error correcting to allow 100% data.  If a
> link between a RTP/RTPD connection is slow or intermittent then RTPD
> will create more overhead for the system as it tries to keep the data
> flow 100%.
>
> RTPD can handle as many RTP connections as the platform performance  
> will
> allow, easily in the hundreds of connections if the links are stable.
> The observed slow down in performance may come from a Client  
> connection
> like RT_Display as these clients use other resources in the system to
> display the data etc.  Intermittent or slow links increase overhead  
> for
> RTPD as mentioned but rarely would there be an observed slowdown in
> performance, instead delayed or gapped data flow from the intermittent
> station.
>
> RTPD to RTPD connections are also of small overhead, rtp2rtpd for
> example. However the clients connected to these additional RTPD's  
> may be
> the area where you would see performance problems if the clients are
> using other system resources heavily.  REF TEK would not recommend
> multiple instances of RTPD on the same machine unless different ports
> were used via rtp2rtpd.   UDP 2543 is the RTP Fixed data port and this
> should have a single RTPD to connect to, the primary.
>
> The only other time you may see problems in performance is when the
> archive has reached its purge threshold and starts using the buffer
> space to keep current data while deleting older data.  There is a
> section in the rtpd.ini file to help stream line this purging process,
> rather than deleting single files, blocks of files or an allotted
> archive space can be deleted in one go.
>
> I hope this helped and please let us know if you have any further
> questions.
>
> Ian billings.
> Customer Service Engineer
> Refraction Technology Inc
> 1600 10th Street Plano TX 75074 USA
> Ph 214 440-1265 or 214 440-1289 (direct)
> http://support.reftek.com
>
> -----Original Message-----
> From: anss-netops-bounces at geohazards.usgs.gov
> [mailto:anss-netops-bounces at geohazards.usgs.gov] On Behalf Of
> mwithers at memphis.edu
> Sent: Tuesday, May 11, 2010 7:40 AM
> To: anss-netops at geohazards.usgs.gov
> Subject: [ANSS-netops] rtpd max clients
>
>
> Anyone running a monster RTPD with many clients?  I'm running rtpd
> 2.1.8.0
> on a SunFire V210 with Soalaris 10 and have MacClient configured to  
> 16.
> Actual connections are 7 DAS's, one instance of rtp2rtpd, rtcc, and  
> rtpm
> (I assume a client is anything that connects to the port whether its
> a das or software).
>
> In people's experience how many clients can you have before it starts
> bogging
> down if we assume 100BaseT internet?
>
> Is it better to run mulitple instances of rtpd on the same machine  
> with
> different ports and relatively small MaxClient or is it better to run
> one big one with a large MaxClient?
>
> Does running multiple instances of rtpd on a single host cause  
> problems?
>
> Can mulitple instances of rtpd be aggregated into a single rtpd via
> rtp2rtpd
> that doesn't have the overhead of a bunch of DAS connections?
>
> Ok, some of these questions may be more appropriate for reftek support
> but its still useful knowing how people have things lashed up.
>
> Mitch
>
> Center for Earthquake Research and Information (CERI)
> University of Memphis                Ph: 901-678-4940
> Memphis, TN 38152                   Fax: 901-678-4734
>
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