[Arm-dev] Using zram-swap
Fred Gleason
fredg at paravelsystems.com
Fri Oct 12 17:03:26 UTC 2018
On Oct 12, 2018, at 12:25, Gordan Bobic <gordan at redsleeve.org> wrote:
> Because swapping to SD card is slow, swapping to zram is fast, and zram only takes about 1/2 of the RAM that it provides.
> It's basically RAM compression.
> It works and makes a positive difference, even without exceedingly slow storage.
Right, but that begs a larger question: why swap *at all*? The whole point of virtual memory in the first place was as a performance hack to allow the processor to see a larger memory space than can be accommodated by core RAM alone. For certain workloads, in situations where one has a mass storage device upon which to place the swapped memory pages, this makes sense; but when the ‘storage device’ is the very core RAM that one is attempting to ‘extend’, it becomes a completely self-defeating exercise; complexity for the sake of complexity.
Cheers!
|----------------------------------------------------------------------|
| Frederick F. Gleason, Jr. | Chief Developer |
| | Paravel Systems |
|----------------------------------------------------------------------|
| An expert is a person who avoids the small errors while he sweeps |
| on to the grand fallacy. |
| -- Benjamin Stolberg |
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