[tahoe-dev] Performance question: reading from/writing to a grid of 4 data centers using 9-out-of-24 coding

[Oleksandr Drach]

*Robin,*
I think your grid speed is quite good.
Could you please briefly provide your hardware details?

You can additionally check every download operation on Status
Page<http://yournode.com:3456/status/>.
Click on Status column and you'll find more
details<http://yournode.com:3456/status/down-0>
.
Timeline <http://yournode.com:3456/status/down-0/timeline> is also may be
very useful.

You can find further readings on Tahoe-Lafs performance
here<https://tahoe-lafs.org/trac/tahoe-lafs/wiki/Performance>and
there <https://tahoe-lafs.org/trac/tahoe-lafs/wiki/Performance/Old>.

*Zooko,*
I think adding "real" performance numbers to the Performance
page<https://tahoe-lafs.org/trac/tahoe-lafs/wiki/Performance> will
be really helpful for a lot of people.


*Sincerely,
Oleksandr Drach,*

*e-mail: **luckyredhot at gmail.com* <luckyredhot at gmail.com>*.*


2013/3/4 Ed Kapitein <ed at kapitein.org>

> Hi Robin,
>
> I am quiet new too, and i ran into a "out of memory" situation, while
> reading a large file.
> Did you check to see if the reading machine starts swapping?
> ( you can check with top )
> That could make the machine and the reading real slow.
>
> Kind regards,
> Ed
>
> On Mon, 2013-03-04 at 10:45 -0500, Robin Chen wrote:
> > Hi,
> >
> >
> > I have recently started my experiments with Tahoe and deployed 24
> > Tahoe storage nodes in 4 data centers (using 9 out-of 24 coding), but
> > I'm running into a performance problem.
> >
> >
> > I'm new to this email list, so I'm not sure if this problem has been
> > discussed before or not.
> >
> >
> > I would expect the "reading" performance (reading 9 shares) to be
> > better than the "writing" performance (writing 24 shares in 4
> > geographically-distribute data centers), but the reading time is
> > typically two times longer in most of my tests with files > 300MB.
> >
> >
> > For example, for a file size of 383MB,  I'm getting about 16Mbps in
> > throughput for writing, but only about 8.8Mbps in reading.
> >
> >
> > Any possible explanation?
> >
> >
> > Thanks!
> >
> >
> > Robin
> > _______________________________________________
> > tahoe-dev mailing list
> > tahoe-dev at tahoe-lafs.org
> > https://tahoe-lafs.org/cgi-bin/mailman/listinfo/tahoe-dev
>
>
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