sorear changed the topic of #riscv to: RISC-V instruction set architecture | https://riscv.org | Logs: https://libera.irclog.whitequark.org/riscv | Backup if libera.chat and freenode fall over: irc.oftc.net
<xentrac> my laptop uses 2000-3000 pJ per instruction, the STM32F0 uses 1500 pJ/insn, the STM32L0 or Atmel SAMD picoPower ARM chips use 150-250 pJ (a little less than the MSP430), and the Ambiq chips are like 30 pJ/insn
<xentrac> well, I guess the GreenArrays chips do come close to the Ambiq datasheet numbers without using subthreshold
<xentrac> by virtue of having 144 bytes of RAM per processor and being 100% asynchronous logic
<xentrac> but they aren't very practical to program
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<xentrac> I feel like the Ambiqs' 384KiB or 768KiB of RAM is a lot more practical to run a self-hosted development environment on than 64KiB or something. and with the Ambiq chips any RAM that's on another chip (and thus not using subthreshold circuitry) is going to use a massive amount of power compared to the CPU itself, so having a large local RAM cache is a lot more important than with something that uses 50
<xentrac> times as much energy like an ESP32
<sorear> wonder if at any point we'll switch to MeV
<xentrac> instead of pJ?
<sorear> yes
<solrize> self hosted development seems like it shouldn't be that important... if i want a super low powered processor i'd think in most cases an 8 bitter is enough
<solrize> lol
<solrize> 1 MeV = 6.24 pJ?
<solrize> or the other way
<solrize> yeah 0.16 pJ
<xentrac> there aren't any 8-bitters within a factor of 5 of the Ambiq machines' datasheet claims
<xentrac> self-hosted development is important to me, but I recognize that other people have other priorities :)
<solrize> istm self hosted is for if your cross dev environment isn't good enough
<xentrac> it isn't, because it needs batteries
<sorear> any interactive development environment needs to budget 100W for the human body, and once you do that a lot of things become rounding errors
<sorear> /ymmv
<xentrac> that's temporary
<xentrac> also though my body doesn't need batteries
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<bkeys> I am selling my Sifive board if anyone is interested: http://ebay.us/NegdkD?cmpnId=5338273189
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<pierce> Throw it up on the riscv subreddit. Someone there might bite
<pierce> I've already got one myself, so $600 is a bit much for me to splurge on a second one
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<bkeys> It will not let me post on there because I have no gmail/twitter/etc account to link to it
* bkeys sighs with aggravation
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