[Go-essp-tech] download rates

[Estanislao Gonzalez]

Hi,

by Michael suggestion I started a page in the esgf.org wiki were we 
could write our measurement regarding CMIP5 federation.
It is not intended for the technical staff, so don't complain about it 
being too simplified :-)
On the contrary, it is intended to be a very first and rough 
approximation to what's happening in the cloud by allowing everyone in 5 
sec to write a measurement down.

Everyone has write access to this and if we see the necessity we could 
evolve it into something more detailed, but which will certainly leave 
the lay users outside.

And the link:
http://esgf.org/wiki/Cmip5Status/Datarates

Does someone else find this useful? Any comments?

Thanks,
Estani

Am 03.03.2011 09:04, schrieb Estanislao Gonzalez:
> Hi Karl,
>
> I'm currently testing the replication via wget and got an average of 
> 350 Mbps (around 40MB/s) with 7 parallel streams in the last 14 hours. 
> I've already downloaded 2TB.
>
> So I guess the problem is across the Atlantic. I'd suggest to start 
> many more parallel streams.
>
> In any case I think this might be caused by some problems/congestion 
> in intermediate networks. The network throughput to ECMWF *might* not 
> be comparable because of the network architecture, e.g. intermediate 
> proxies, firewalls, etc. But a 10x speed up might be of no use anyway 
> as downloading 1TB in 2 Months seems hardly to be an option...
>
> When we all have the data replicated worldwide though, it will be 
> possible to download from all 3 servers at the same time, which will 
> more than double the speed from this side of the ocean, and will be a 
> considerable speed up from yours, although probably not as much (don't 
> nail me on this, I'll deny it vehemently <- this is not my writing :-)
>
> Anyway, this being said, the rest should be answered by BADC directly.
>
> Thanks,
> Estani
>
> Am 03.03.2011 02:26, schrieb Karl Taylor:
> > this should have been sent to
> go-essp-tech at ucar.edu
>
> >
>
> > sorry about that.
>
> >
>
> > Karl
>
> >
>
> > -------- Original Message -------- Subject: download rates
> Date:
>
> > Wed, 2 Mar 2011 16:43:42 -0800 From: Karl Taylor
>
> > <taylor13 at llnl.gov> To: esg-support at earthsystemgrid.org
> Grid
>
> > <esg-support at earthsystemgrid.org>
>
> >
>
> >
>
> >
>
> > Hi all,
>
> >
>
> > When I download a 25 MB CMIP5 file from BADC using the wget
> method: *
>
> > it took 35 sec to get started * then it downloaded at an
> average rate
>
> > of 1.1 MB/min
>
> >
>
> > When I download the same file using the point and click
> method: * it
>
> > took 20 sec to get started * then it downloaded at an average
> rate of
>
> > 1.4 MB/min
>
> >
>
> > When I download 4 files simultaneously (in parallel) using
> the click
>
> > method, I get somewhat slower download rate per file, so
> somewhat
>
> > less than 4 times the data transfer rate I would have gotten
>
> > downloading them in series.
>
> >
>
> > Note that at 1 MB/min, I could download 1 GB in about 17
> hours or 1
>
> > TB (i.e., about 1/1000 of the entire archive) in about 2
> years.
>
> >
>
> > Any way to speed this up some? (A colleague here downloads
> files at
>
> > about 10 times this rate from ECMWF.)
>
> >
>
> > Note that I haven't checked how fast download rates are from
> nodes
>
> > published to our (PCMDI's) gateway (since they are not yet
> publicly
>
> > available).
>
> >
>
> > Best regards, Karl
>
> >
>
> >
>
> >
>
> >
>
> > _______________________________________________ GO-ESSP-TECH
> mailing
>
> > list GO-ESSP-TECH at ucar.edu
>
> > http://mailman.ucar.edu/mailman/listinfo/go-essp-tech
>
>
> -- 
> Estanislao Gonzalez
>
> Max-Planck-Institut für Meteorologie (MPI-M)
> Deutsches Klimarechenzentrum (DKRZ) - German Climate Computing Centre
> Room 108 - Bundesstrasse 45a, D-20146 Hamburg, Germany
>
> Phone:   +49 (40) 46 00 94-126
> E-Mail: estanislao.gonzalez at zmaw.de


-- 
Estanislao Gonzalez

Max-Planck-Institut für Meteorologie (MPI-M)
Deutsches Klimarechenzentrum (DKRZ) - German Climate Computing Centre
Room 108 - Bundesstrasse 45a, D-20146 Hamburg, Germany

Phone:   +49 (40) 46 00 94-126
E-Mail:  estanislao.gonzalez at zmaw.de

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