Re: [conduit] Large lags on CONDUIT feed - started a week or so ago

With the conduit request split into 10 threads for this morning's 12Z data, I think there was some improvement, though not conclusive. Our delay peaked at about 2200 seconds which was much better than yesterday, but about the same as on the 10th.  However, I think the delays today at other sites were worse than the recent average, which is why I think it was an improvement.

A traceroute shows our connection going through Chicago (rtsw.chic.net.internet2.edu) with an RTT of about 16 ms and then through Ashburn (rtsw.ashb.net.internet2.edu) with an RTT of about 32 ms, and finally into the Max Gigapop (clpk-core.maxgigapop.net) with an RTT of about 34 ms.  Anyone follow a similar route to this that you could share some times on?

                    Art

Arthur A. Person
Assistant Research Professor, System Administrator
Penn State Department of Meteorology and Atmospheric Science
email:  address@hidden, phone:  814-863-1563

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From: address@hidden <address@hidden> on behalf of Person, Arthur A. <address@hidden>
Sent: Tuesday, March 12, 2019 10:22 AM
To: Carissa Klemmer - NOAA Federal; Pete Pokrandt
Cc: address@hidden; _NCEP.List.pmb-dataflow; address@hidden
Subject: Re: [conduit] Large lags on CONDUIT feed - started a week or so ago

 

Thanks Carissa.

Pete, I was running a single request until recently, but split it into 5 a couple weeks ago with the results I reported below.  I'll try 10 and see if that helps further.  It's been my experience that when the latencies go bad, they are usually worse getting to us than other sites, not sure why.  Perhaps the route, or proximity to I2 backbone...?  Things had been great for months until approximately February 10th, give or take a few days.  Since then, the latencies have been terrible.

                  Art

Arthur A. Person
Assistant Research Professor, System Administrator
Penn State Department of Meteorology and Atmospheric Science
email:  address@hidden, phone:  814-863-1563

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From: Carissa Klemmer - NOAA Federal <address@hidden>
Sent: Tuesday, March 12, 2019 8:30 AM
To: Pete Pokrandt
Cc: Person, Arthur A.; address@hidden; address@hidden; _NCEP.List.pmb-dataflow
Subject: Re: Large lags on CONDUIT feed - started a week or so ago

 

Hi Everyone

I’ve added the Dataflow team email to the thread. I haven’t heard that any changes were made or that any issues were found. But the team can look today and see if we have any signifiers of overall slowness with anything. 

Dataflow, try taking a look at the new Citrix or VM troubleshooting tools if there are any abnormal signatures that may explain this. 

On Monday, March 11, 2019, Pete Pokrandt <address@hidden> wrote:

Art,

I don't know if NCEP ever figured anything out, but I've been able to keep my latencies reasonable (300-600s max, mostly during the 12 UTC model suite) by splitting my CONDUIT request 10 ways, instead of the 5 that I had been doing, or in a single request. Maybe give that a try and see if it helps at all.

Pete

--
Pete Pokrandt - Systems Programmer
UW-Madison Dept of Atmospheric and Oceanic Sciences
608-262-3086  - address@hidden

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From: Person, Arthur A. <address@hidden>
Sent: Monday, March 11, 2019 3:45 PM
To: Holly Uhlenhake - NOAA Federal; Pete Pokrandt
Cc: address@hidden; address@hidden.edu
Subject: Re: [conduit] Large lags on CONDUIT feed - started a week or so ago

 

Holly,

Was there any resolution to this on the NCEP end?  I'm still seeing terrible delays (1000-4000 seconds) receiving data from conduit.ncep.noaa.gov.  It would be helpful to know if things are resolved at NCEP's end so I know whether to look further down the line.

Thanks...           Art

Arthur A. Person
Assistant Research Professor, System Administrator
Penn State Department of Meteorology and Atmospheric Science
email:  address@hidden, phone:  814-863-1563

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From: address@hidden.edu <address@hidden.edu> on behalf of Holly Uhlenhake - NOAA Federal <address@hidden>
Sent: Thursday, February 21, 2019 12:05 PM
To: Pete Pokrandt
Cc: address@hidden; address@hidden.edu
Subject: Re: [conduit] Large lags on CONDUIT feed - started a week or so ago

 

Hi Pete,

We'll take a look and see if we can figure out what might be going on.  We haven't done anything to try and address this yet, but based on your analysis I'm suspicious that it might be tied to a resource constraint on the VM or the blade it resides on.

Thanks,

Holly Uhlenhake

Acting Dataflow Team Lead

On Thu, Feb 21, 2019 at 11:32 AM Pete Pokrandt <address@hidden> wrote:

Just FYI, data is flowing, but the large lags continue.

http://rtstats.unidata.ucar.edu/cgi-bin/rtstats/iddstats_nc?CONDUIT+idd.aos.wisc.edu

http://rtstats.unidata.ucar.edu/cgi-bin/rtstats/iddstats_nc?CONDUIT+conduit.unidata.ucar.edu

Pete

--
Pete Pokrandt - Systems Programmer
UW-Madison Dept of Atmospheric and Oceanic Sciences
608-262-3086  - address@hidden

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From: address@hidden.edu <address@hidden.edu> on behalf of Pete Pokrandt <address@hidden>
Sent: Wednesday, February 20, 2019 12:07 PM
To: Carissa Klemmer - NOAA Federal
Cc: address@hidden; address@hidden.edu
Subject: Re: [conduit] Large lags on CONDUIT feed - started a week or so ago

 

Data is flowing again - picked up somewhere in the GEFS. Maybe CONDUIT server was restarted, or ldm on it? Lags are large (3000s+) but dropping slowly

Pete

--
Pete Pokrandt - Systems Programmer
UW-Madison Dept of Atmospheric and Oceanic Sciences
608-262-3086  - address@hidden

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From: address@hidden.edu <address@hidden.edu> on behalf of Pete Pokrandt <address@hidden>
Sent: Wednesday, February 20, 2019 11:56 AM
To: Carissa Klemmer - NOAA Federal
Cc: address@hidden; address@hidden.edu
Subject: Re: [conduit] Large lags on CONDUIT feed - started a week or so ago

 

Just a quick follow-up - we started falling far enough behind (3600+ sec) that we are losing data. We got short files starting at 174h into the GFS run, and only got (incomplete) data through 207h.

We have now not received any data on CONDUIT since 11:27 AM CST (1727 UTC) today (Wed Feb 20)

Pete

--
Pete Pokrandt - Systems Programmer
UW-Madison Dept of Atmospheric and Oceanic Sciences
608-262-3086  - address@hidden

---

From: address@hidden.edu <address@hidden.edu> on behalf of Pete Pokrandt <address@hidden>
Sent: Wednesday, February 20, 2019 11:28 AM
To: Carissa Klemmer - NOAA Federal
Cc: address@hidden; address@hidden.edu
Subject: [conduit] Large lags on CONDUIT feed - started a week or so ago

 

Carissa,

We have been feeding CONDUIT using a 5 way split feed direct from conduit.ncep.noaa.gov, and it had been really good for some time, lags 30-60 seconds or less.

However, the past week or so, we've been seeing some very large lags during each 6 hour model suite - Unidata is also seeing these - they are also feeding direct from conduit.ncep.noaa.gov.

http://rtstats.unidata.ucar.edu/cgi-bin/rtstats/iddstats_nc?CONDUIT+idd.aos.wisc.edu

http://rtstats.unidata.ucar.edu/cgi-bin/rtstats/iddstats_nc?CONDUIT+conduit.unidata.ucar.edu

Any idea what's going on, or how we can find out? 

Thanks!

Pete

--
Pete Pokrandt - Systems Programmer
UW-Madison Dept of Atmospheric and Oceanic Sciences
608-262-3086  - address@hidden

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--

Carissa Klemmer
NCEP Central Operations
IDSB Branch Chief

301-683-3835

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