What is better than a Raspberry Pi?
18 Jun 2015 7:45:12 UTC
Topic 198126
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Two Raspberry Pi. :D
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Points are nothing to brag about but power draw is a bragging point. And for me at this time of year NO HEAT to deal with. Normally at this time of year I have to shut down most of my crunching PCs and GPUs. This way I am still doing something and these Raspberrys are fun to play with. These are RPi 2 with quad cores. Also have a 256meg one I do other things with.
About 14 hours a work unit.
Cheers!
What is better than a Raspberry Pi?
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Interesting "case". I am waiting for a similar one to arrive (a single stack). The case I had bought will not work for my intended application. Maybe I can crunch and crawl at the same time.
I do wish they would tap the Pi's board to use M3 rather then M2.5 standoffs. The 2.5s are hard to find and a bit on the pricey side when you do locate them.
RE: Interesting "case". I
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The casr was sold as a single I just put them together. http://smile.amazon.com/gp/product/B00M859PA6?psc=1&redirect=true&ref_=oh_aui_detailpage_o01_s00 A small fan was supplied with the kits but I have not seen a need for it. vcgencmd measure_temp reports 64c.
Nice project you have going there. :-)
Something kinda interesting. The first Pi which has run a few days longer does about 49.5-50.5k seconds. The second ones first 4 completed today were all 48k. There are 2 differences in the builds. First one has a class 4 card and is running 7.2.47 compiled from sources. The second one is class 10 card and I installed 7.0 via repositories and then compiled 7.2.47 and copied the compiled binaries over the 7.0 binaries. Had to edit the PATH statements in /etc/default/boinc-client. Doing it this way /etc/init.d/boinc-client starts and stops boinc as it should and got all the config files installed in /etc/boinc.
May try doing the first install as the second and see if that is the difference.
Cheers!
EDIT: While writing this the second one suffered it's second crash, erroring a few work units. hmmmm
When I was crunching with the
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When I was crunching with the earlier Pi I had read that repeated reads/writes to an SD card could eventually result in unreliability and possible loss of data. What I did was to keep the /boot partition on the sd card (I believe that you must do this), but move the /root partion to a USB 3.0 external disk drive powered by a USB hub. Very little writing is done to the boot partition so there should be no degradation with time. The larger USB 3.0 drive will allow for the constant download/upload scenario associated with crunching and provide a more stable environment. There is a write up on my site on how to do this if interested.