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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
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Hi Waldenio, re: I regret that you were not able to be in Baltimore for the AGU meeting > I regret this also :-( May be some opportunity arise in September, > during another WMO meeting in Peru. My intention is to provide training > courses for others countries of South America in december. So some of > these peoples can attend here also. This sounds good! re: there is a bottleneck somewhere, and we need to work to find it > I think that the bottleneck lies in Sao Paulo (FAPESP). So we will > need to "show them" that they are the bottleneck. To do this work, > I think that FTP can be a tool. I am not sure that FTP is the best thing to use for this test. What we could do is run a separate instance of the LDM on yakov and some other machine at CPTEC using a port different than 388. If there is port-specific packet shaping going on (our theory), then running the LDM on a different port will demonstrate it conclusively. Do you (CPTEC) have a spare machine on which we could load and run the LDM requesting CONDUIT data from yakov.unidata.ucar.edu? If yes, we should work together to get a test setup using a different port and see if the rate limiting exists on the test machine. In the meantime, however, it will be useful to do the 10-way split of CONDUIT feed requests AND change the upstream from idd.cise-nsf.gov to idd.unidata.ucar.edu. If my theory is correct, the 10-way split should result in significantly lower latencies. The reason for this is that each request will get 10% of the full feed, or about 150 MB/hour. Since moingobe is able to ingest the NNEXRAD datastream with no latency, and since the average hourly volume in NNEXRAD is on the order of 150 MB/hour, the ten-way split of CONDUIT should result in 10 connections carrying about the same load as the single NNEXRAD feed. Please let me know when you have implemented the 10-way CONDUIT split and if you can identify a test machine on which we could run LDM tests using a port other than 388. > Cheers, > Waldenio. > > > Cheers, Tom **************************************************************************** Unidata User Support UCAR Unidata Program (303) 497-8642 P.O. Box 3000 support@xxxxxxxxxxxxxxxx Boulder, CO 80307 ---------------------------------------------------------------------------- Unidata HomePage http://www.unidata.ucar.edu **************************************************************************** Ticket Details ================== Ticket ID: XPZ-611749 Department: Support IDD Brasil Priority: Normal Status: Closed
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