[tahoe-dev] Recommendations for minimal RAM usage ?

sickness sickness at tiscali.it
Thu Mar 8 00:09:05 UTC 2012


How much would you like to get paid to implement this?
https://tahoe-lafs.org/trac/tahoe-lafs/ticket/1382
;)

On Thu, Mar 08, 2012 at 12:37:22AM +0100, Johannes Nix wrote:
> Hi,
> 
> just to acknowledge Zooko's comment, it's clear to me that there
> are multiple more important topics than adjusting Tahoe-LAFS
> to minimal RAM. 
> 
> Maybe I should take the way of least resistance and try to make an
> upgrade to some more modern, powerful and fatter hardware.... such as
> the Rasperry Pi *g*. The Rasperry is going to ship with 256 MB RAM but
> its CPU is said to be relatively slow. I also tried (so far
> unsuccessfully) to install Tahoe on a Nokia N900 Phone which has a
> OMAP3 SoC with ARM Cortex A8 CPU and, for purposes of cryptography much
> more interesting, an integrated TMS320C64x DSP. This platform is
> certainly more powerful than my NAS, so I think it's completely
> realistic to run a Tahoe-LAFS client on a N900 or comparable open
> platforms.
> 
> I would love to help a bit, it's interesting enough for me. I'll try to
> dig a little into the code at least. I think if I can do
> something, it would be rather highly focused changes in some 
> hot spots than general overhauls.
> 
> OTOH I currently also have to address some job-related issues...
> I would love to get paid for work at that level, heck.
> 
> What Brian does around Ed25519 looks great.... What are the main speed
> bottlenecks  in Tahoe-LAFS now? Could it be grid latencies / network
> bandwidth for fast systems and encoding for slow processors? 
> And would a parallelized variant of the encoding make sense for a
> typical multicore consumer laptop?
> 
> Regards,
> 
> - Johannes
> 
> 
> 
> On Mon, 5 Mar 2012 15:49:43 -0700
> "Zooko Wilcox-O'Hearn" <zooko at zooko.com> wrote:
> 
> > I wrote:
> > 
> > On Mon, Mar 5, 2012 at 12:24 PM, Zooko Wilcox-O'Hearn
> > <zooko at zooko.com> wrote:
> > >
> > > Just to be explicit about this, I'm not going to start doing these
> > > experiments myself anytime soon. I would love for Tahoe-LAFS to get
> > > slimmer on memory usage, and to continue to fit into more and more
> > > cute little ARM devices. (I just ordered my Raspberry Pi!) But, I
> > > have higher priorities in Tahoe-LAFS development right now. I'll
> > > offer
> >   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> > > encouragement, advice, feedback, and patch review.
> > 
> > For the record, my highest priorities in life nowadays are my family
> > and Least Authority Enterprises. LAE work often contributes directly
> > or indirectly to Tahoe-LAFS development (we have a policy of
> > contributing all of the source code that we write, plus trying to give
> > back in terms of documentation, knowledge we've gained, etc.). But it
> > isn't primarily about Tahoe-LAFS development.
> > 
> > In the context of Tahoe-LAFS development, my first priority right now
> > is unblocking Brian's accounting work by releasing a version of
> > pycryptopp with his Ed25519 port in it:
> > 
> > https://tahoe-lafs.org/trac/pycryptopp/milestone/0.6.0
> > 
> > I'm the limiting factor in that, since we decided to use pycryptopp as
> > the vehicle for tahoe-lafs to use Ed25519, and since I want to do the
> > API and the new pycryptopp release my way.
> > 
> > Once Brian is sufficiently unblocked, my next priority within
> > Tahoe-LAFS development will be helping Kevan and others address the
> > regressions and bugs in the new 1.9 code:
> > 
> > https://tahoe-lafs.org/trac/tahoe-lafs/milestone/1.9.2
> > 
> > Regards,
> > 
> > Zooko
> > _______________________________________________
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> > tahoe-dev at tahoe-lafs.org
> > http://tahoe-lafs.org/cgi-bin/mailman/listinfo/tahoe-dev
> 
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