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Thread: Compression to save energy

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    Compression to save energy

    Reading through RISC-V developments, I stumbled upon interesting snipplet:
    https://riscv.org/wp-content/uploads...C-Koskinen.pdf
    Radio energy: 100 nJ/bit (Zigbee), 50.00 nJ/bit (BT), 3.70 nJ/bit (Wifi)
    • Memory energy: ~100pJ
    • Local memory accesses, DRAM accesses
    • Flash much more
    • Basic compute @VDD Nominal : ~50pj
    • Basic compute @ULV: ~5pj
    • Memory compression becomes cheaper in terms of energy
    Really, I think it's a stretch, unless they mean compression data in transit. But anyway, thought about letting you know.

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    There is a thermodynamic limit to the cost of writing a bit of memory. It is kT ln 2, where k is Boltzmann's constant and T is temperature. At room temperature (300 K), it is about 3 zJ (3 zeptojoules, 3 x 10^-21 J) or a billion times less than ULV. Storing memory in DNA comes much closer to this limit.

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