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> compressed memory doesn't solve much and it's been available in all other OS for a long time. many reported that compressed memory can negatively impact per

• lloeki 3y ago
  Don't know how compressed memory works for in Windows, but on macOS its role is equivalent to swapping. No memory is compressed unless pages are evicted due to not being used. If memory compression wasn't present then it'd been swapped to disk.
  • taway1237 3y ago
    Sounds exactly like zswap. Are there differences that make it better?
    • lloeki 3y ago
      Not that I know of. What I don't know and which might make a difference is when evicting to disk, zswap decompresses and swaps to disk uncompressed† as if swap wasn't there, while macOS might (or might not) disk-swap it compressed (so, a bit by bit copy), minimising CPU, IO, and size (and wear for SSDs) at the cost of decompressing when paging it in again. † Unless the underlying block device backing the swap device or file does transparent compression, in which case it gets decompressed by zswap then compressed by whatever (e.g LVM compression).
  • peoplefromibiza 3y ago
    > No memory is compressed unless pages are evicted due to not being used It's the same in Windows. You can't enable memory compression in Windows unless a page file is present (have not used Windows in 10 years, but that's what I gathered from researching the topic)