5 ms·

I always reply to these comments because well they are simply wrong for regular Raspberry clusters (this one is stupid though, but still fun to watch): 1) The

by bullen 5y ago

I always reply to these comments because well they are simply wrong for regular Raspberry clusters (this one is stupid though, but still fun to watch): 1) The Raspberry Pi 4 is THE cheapest 2Gflops/W computer ever made and probably that will ever be made in the future too! Peak of energy/resources/lithography/architectures and velocity of money against that, will most likely make it so. 2) You can scale the Raspberry cluster as you want it, only power the nodes you need, it's modular, one breaks you still have a few left, same for the SD cards which BTW while being so slow a Raspberry 2 (2W!) can saturate them they are SURPRISINGLY sturdy (my original SanDisc (every other brand has been a complete scam) are on their 7th year of 99.999% uptime, down when my power company cut the electricity for an hour). 3) The Raspberry cluster is smaller, cooler and silent (if passively cooled, it's the most powerful device that can be fully passively cooled at 100% CPU (7W) without becoming too hot to wear early) and wont fail because of failing fans! 4) For battery backup there is nothing better because beyond total of 100W for 24 hours you start to see the limits of what is practical to manage on a individual basis. I post this picture every time: http://move.rupy.se/file/final_pi_2_4_hybrid.png http://move.rupy.se/file/final_pi_2_4_hybrid.png (this is how you cool a Raspberry 2/4 hybrid cluster)

deleted 5y ago
[deleted]
Terry_Roll 5y ago
Expanding on #2, when thinking of things like Spectre & Meltdown ie CISC HW flaws, offloading or running a variety of services/daemons on physically separate machines can also improve security. We all get told to reduce the attack vector and this is one way to do that. The organisational hierarchy best exemplifies this security isolation point for an entity, like businesses, govts, etc etc.
- qayxc 5y ago
  > when thinking of things like Spectre & Meltdown ie CISC HW flaws Spectre in particular is not a CISC HW flaw. It affects ARM and other RISC architectures as well: https://developer.arm.com/support/arm-security-updates/speculative-processor-vulnerability/downloads/addressing-spectre-variant-1-in-software https://developer.arm.com/support/arm-security-updates/specu...
  - Terry_Roll 5y ago
    Know your HW. https://www.raspberrypi.com/news/why-raspberry-pi-isnt-vulnerable-to-spectre-or-meltdown/ https://www.raspberrypi.com/news/why-raspberry-pi-isnt-vulne... "Both vulnerabilities exploit performance features (caching and speculative execution) common to many modern processors to leak data via a so-called side-channel attack. Happily, the Raspberry Pi isn’t susceptible to these vulnerabilities, because of the particular ARM cores that we use."
    - bullen 5y ago
      A72 is susceptible to Spectre because it has speculative execution I think. That article was written before the release of Pi 4: 5th Jan 2018 https://forums.raspberrypi.com/viewtopic.php?t=243416 https://forums.raspberrypi.com/viewtopic.php?t=243416 You don't get to 2 Gflops/W that easily!
      - Terry_Roll 5y ago
        Someone ran a checker on the RPI4 https://forums.raspberrypi.com/viewtopic.php?t=243416#p1534481 https://forums.raspberrypi.com/viewtopic.php?t=243416#p15344... Results https://pastebin.com/GLRy6uWK https://pastebin.com/GLRy6uWK "> STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulne rable) > SUMMARY: CVE-2017-5753:OK CVE-2017-5715:OK CVE-2017-5754:OK CVE-2018-3640:OK C VE-2018-3639:OK CVE-2018-3615:OK CVE-2018-3620:OK CVE-2018-3646:OK CVE-2018-1212 6:OK CVE-2018-12130:OK CVE-2018-12127:OK CVE-2019-11091:OK We're missing some kernel info (see -v), accuracy might be reduced Need more detailed information about mitigation options? Use --explain A false sense of security is worse than no security at all, see --disclaimer" Still seems to be in the clear but some info cant be obtained which might change the results.
xuejie 5y ago
> The Raspberry Pi 4 is THE cheapest 2Gflops/W computer ever made and probably that will ever be made in the future too! Can you expand on this one? I was curious why you think there probably will not be a cheaper one in the future with similar or better specs.

by bullen 5y ago

deleted 5y ago

[deleted]

Terry_Roll 5y ago

Expanding on #2, when thinking of things like Spectre & Meltdown ie CISC HW flaws, offloading or running a variety of services/daemons on physically separate machines can also improve security. We all get told to reduce the attack vector and this is one way to do that. The organisational hierarchy best exemplifies this security isolation point for an entity, like businesses, govts, etc etc.

qayxc 5y ago
> when thinking of things like Spectre & Meltdown ie CISC HW flaws Spectre in particular is not a CISC HW flaw. It affects ARM and other RISC architectures as well: https://developer.arm.com/support/arm-security-updates/speculative-processor-vulnerability/downloads/addressing-spectre-variant-1-in-software https://developer.arm.com/support/arm-security-updates/specu...
- Terry_Roll 5y ago
  Know your HW. https://www.raspberrypi.com/news/why-raspberry-pi-isnt-vulnerable-to-spectre-or-meltdown/ https://www.raspberrypi.com/news/why-raspberry-pi-isnt-vulne... "Both vulnerabilities exploit performance features (caching and speculative execution) common to many modern processors to leak data via a so-called side-channel attack. Happily, the Raspberry Pi isn’t susceptible to these vulnerabilities, because of the particular ARM cores that we use."
  - bullen 5y ago
    A72 is susceptible to Spectre because it has speculative execution I think. That article was written before the release of Pi 4: 5th Jan 2018 https://forums.raspberrypi.com/viewtopic.php?t=243416 https://forums.raspberrypi.com/viewtopic.php?t=243416 You don't get to 2 Gflops/W that easily!
    - Terry_Roll 5y ago
      Someone ran a checker on the RPI4 https://forums.raspberrypi.com/viewtopic.php?t=243416#p1534481 https://forums.raspberrypi.com/viewtopic.php?t=243416#p15344... Results https://pastebin.com/GLRy6uWK https://pastebin.com/GLRy6uWK "> STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulne rable) > SUMMARY: CVE-2017-5753:OK CVE-2017-5715:OK CVE-2017-5754:OK CVE-2018-3640:OK C VE-2018-3639:OK CVE-2018-3615:OK CVE-2018-3620:OK CVE-2018-3646:OK CVE-2018-1212 6:OK CVE-2018-12130:OK CVE-2018-12127:OK CVE-2019-11091:OK We're missing some kernel info (see -v), accuracy might be reduced Need more detailed information about mitigation options? Use --explain A false sense of security is worse than no security at all, see --disclaimer" Still seems to be in the clear but some info cant be obtained which might change the results.

xuejie 5y ago

> The Raspberry Pi 4 is THE cheapest 2Gflops/W computer ever made and probably that will ever be made in the future too! Can you expand on this one? I was curious why you think there probably will not be a cheaper one in the future with similar or better specs.