Re: [Foam-extend-developers] foam-extend on tiny machines...

[Martin B. <bea...@gm...>]

On Wed, Oct 28, 2015 at 3:52 PM, Bernhard Gschaider <bgs...@ic...>
wrote:

> Am 28.10.15 um 16:07 schrieb Martin Beaudoin:
> >
> >
> > On Wed, Oct 28, 2015 at 9:59 AM, Bernhard Gschaider <bgs...@ic...
> > <mailto:bgs...@ic...>> wrote:
> >
> >
> >     >     How long did compilation take?
> >     >
> >     >
> >     > Not sure. The compilation went over multiple phases while I was
> nailing
> >     > down the compilation recipe. I will push a full recompilation a
> little
> >     > bit later next week, and give you the numbers. For sure, compiling
> over
> >     > 4 cores do help a lot, and the speed of your microSD card do play
> a big
> >     > factor as well.
> >
> >     Because that was one of the reasons why I didn't try it on my RasPis.
> >     Estimate was that it would take several days. I even thought about
> >     setting up a virtual machine and cross-compiling (seems that this is
> the
> >     way that packages usually are made for the RasPi)
> >
> >
> > We are not talking multiple days of compilation for sure for a basic
> > install. I think it is still within a 24 hours span, but I will have to
> > check again.
>
> That's consistent with my estimate at the time. From what I remember the
> RasPi 2 is supposed to be 6 times faster than the original
>
> > And I chose to reuse as many system ThirdParty packages as possible. So
> > I did not recompile gcc nor openmpi. I also skipped the compilation of
> > paraview and Qt. But I did compile swak4foam (without a glitch!)
> >
>
> Good to hear
>
> > As for using such small systems for the Workshop USB stick, if we can
> > figure out a way to USB tether a RaspBerry Pi2 with a normal laptop +
> > some kind of terminal app. so we can simply ssh through the USB link,
> > then we could have cheaper solution than the Intel stick.
> >
> > Here is a rough estimate of the cost in USD$, based on the units I have
> > bought so far:
> >
> >   * RaspBerry Pi 2 Model B :            35$
> >   * 32GB Ultra MicroSDHC Class 10 card: 15$
> >   * A Raspberry Pi2 case :              10$
> >   * A USB cable for power and tether :   5$
> >
> > For a total of roughly 65 $USD.
> >
> > And a 32GB card is slightly roomy. The OS is free, and the recipe to
> > deploy foam-extend over this device is known.
> >
> > And we are still not talking bulk pricing here. I am sure we can shave a
> > few $ if we buy a 100 of those...
> >
> > So the only piece of the puzzle remaining is a little bit of software
> > for USB tethering....
> >
> > Maybe we can do all this as well with an Intel Compute stick. Both
> > solutions would be way cool...
>
> But the ultimate decision is of course with the Workshop organizer.
> Because of course the logistics for the production of USB-keys is
> already known
>
> But lets see if we find something
>
>
Some other possible avenues to link a Pi2 with a good old Linux/Mac/Windows
laptop:


   - Ethernet to Ethernet using an Ethernet crossover patch cable.
   Needs an Ethernet port on the laptop, which no longer comes standard on
   some laptops (MacBook Air)
   Probably needs to add some kind of additional network routing to make
   this work while the laptop is still connected to the OFW wifi hotspot

   - Wifi access
   We can transform the Pi2 as a Wifi Access point so the laptop can
   establish a WIFI connection directly with the Pi2.
   We need to add a decent WIFI USB dongle to the Pi2 (+  ~12 USD$)
   Having a room full of 10s of little WIFI Access points/routers would be
   a very funny and probably inextricable mess

   - Serial over USB
   The laptop would connect unidirectionally  the Pi2 using an emulated
   serial/terminal console available over one of the 4 USB ports available on
   the Pi2
   Ohhhhhhh, maybe we have something worth exploring here too..... Kermit
   anyone? LOL :):)

   - TCP/IP over USB
   Looks like we need a special kind of cable for this
   Still investigating....

But definitely, the USB port is probably the most universal connector still
available on a multitude of hardware platforms. Let's find a way to talk to
this little guy...

Martin



> Bernhard
>
>
> >
> > Martin
> >
> >
> >
> >
> ------------------------------------------------------------------------------
> >
> >
> >
> > _______________________________________________
> > Foam-extend-developers mailing list
> > Foa...@li...
> > https://lists.sourceforge.net/lists/listinfo/foam-extend-developers
> >
>
>
> ------------------------------------------------------------------------------
> _______________________________________________
> Foam-extend-developers mailing list
> Foa...@li...
> https://lists.sourceforge.net/lists/listinfo/foam-extend-developers
>



-- 
Martin Beaudoin