<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div>Sameer,</div><div><br></div></span>I see you already found a mention of MPICH2 . Coincidentally was going suggest this coming Saturday as something to demonstrate at OLPC-SF.<br class="Apple-interchange-newline"></span><a href="http://www.mcs.anl.gov/research/projects/mpich2/">http://www.mcs.anl.gov/research/projects/mpich2/</a>
</div><div><br></div><div><a href="http://www.mcs.anl.gov/research/projects/mpich2/documentation/files/mpich2-1.4.1-installguide.pdf">http://www.mcs.anl.gov/research/projects/mpich2/documentation/files/mpich2-1.4.1-installguide.pdf</a></div><div><br class="webkit-block-placeholder"></div><div>I know it is outside the scope of OLPC but it would be interesting to see what this type of message passing interface could do on a group of XOs.</div><div><br></div><div>Robert</div><div><br class="webkit-block-placeholder"></div><div><br></div>
<br><div><div>On Sep 12, 2012, at 9:22 AM, Sameer Verma wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><p>Something like this: <a href="http://paritynews.com/hardware/item/302-engineers-build-supercomputer-using-raspberry-pi-lego">http://paritynews.com/hardware/item/302-engineers-build-supercomputer-using-raspberry-pi-lego</a></p>
<div class="gmail_quote">On Sep 11, 2012 10:43 PM, "Sameer Verma" <<a href="mailto:sverma@sfsu.edu">sverma@sfsu.edu</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
On Tue, Sep 4, 2012 at 9:43 PM, John Watlington <<a href="mailto:wad@laptop.org">wad@laptop.org</a>> wrote:<br>
><br>
> On Sep 4, 2012, at 10:47 PM, Sameer Verma wrote:<br>
><br>
>> Hi gang!<br>
>><br>
>> <a href="http://blog.laptop.org/2012/09/04/are-you-working-with-xo-laptops-that-need-an-upgrade/" target="_blank">http://blog.laptop.org/2012/09/04/are-you-working-with-xo-laptops-that-need-an-upgrade/</a><br>
>><br>
>> So, is there a minimum number of motherboards that one has to buy?<br>
>> Pricing?<br>
><br>
> Both answers should be available from the email listed in the blog:<br>
> <a href="mailto:countries@laptop.org">countries@laptop.org</a>.<br>
><br>
>> Any other details?<br>
><br>
> We've supported this from the beginning by design. Kits have been available<br>
> as spare parts for deployments to purchase. Upgrading an XO-1 to an XO-1.5<br>
> or higher motherboard requires the insertion of a small metal bracket to hold the<br>
> WLAN card. The XO-1.5/1.75 chassis are mechanically identical.<br>
> Upgrading an earlier laptop to an XO-4 motherboard will require a<br>
> small rubber piece inserted to change the size of one chassis hole<br>
> from USB to micro HDMI.<br>
><br>
> Unfortunately, the mechanics of XO-4 Touch mean it cannot be retrofitted.<br>
> You can get the higher performance by upgrading to an XO-4, but sadly<br>
> no multi-touch support.<br>
><br>
> A kit includes all the parts needed to upgrade a particular laptop model. In<br>
> addition to a motherboard (if XO-4 with an internal connector missing)<br>
> this generally includes a new heat spreader, a WLAN card (if needed), and<br>
> conductive foam/tape as needed to improve the ESD shielding of the earlier<br>
> chassis. We do perform some testing of older laptops upgraded to each<br>
> new motherboard design in order to construct appropriate upgrade kits.<br>
><br>
> Cheers,<br>
> wad<br>
><br>
><br>
><br>
<br>
Thanks for the details.<br>
<br>
I was walking through a replacement workflow in my mind for my Jamaica<br>
and India projects, and I realized that if/once the upgrades are done,<br>
one would be left with several older working motherboards. What's to<br>
become of these? If someone could design a chassis to hold a bunch of<br>
boards together...imagine a Beowulf cluster of these! (sorry, couldn't<br>
resist).<br>
<br>
"Is that a lunch box? No, it's my Beowolf cluster. Can I compute<br>
something for you?"<br>
<br>
cheers,<br>
Sameer<br>
</blockquote></div>
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