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Use SD card as swapfile #62

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gfwilliams opened this issue Oct 1, 2013 · 5 comments
Closed

Use SD card as swapfile #62

gfwilliams opened this issue Oct 1, 2013 · 5 comments
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enhancement optimisation

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@gfwilliams
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Espruino's fixed-size JsVar blocks were designed for this, but it was never implemented.

You'd have to change jsVarCache, jsvLock and jsvUnLock, and then store only the most-used (and locked) JsVars in RAM - writing the rest onto the SD card. Probably quite a lot of work, but it'd be epic.

It would kill Garbage Collection speed (it might need a re-write?) but then if you had basically infinite memory that's not a huge issue.
@gfwilliams
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There's a branch that does this here:

https://github.com/espruino/Espruino/tree/variable_cache

It's still far from perfect:

  • it's only built for linux
  • the 'backing' data is just stored in a var called variables, and isn't written to a file
  • it does crash running some tests

But it proves that it can be done - and without hacking everything around so much that it doesn't run on 'normal' devices.

@gfwilliams gfwilliams mentioned this issue Mar 30, 2016
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@gfwilliams
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related comment here: #817 (comment)

@tve
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tve commented May 7, 2016

it does crash running some tests
Do you recall what crashed?

@gfwilliams
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No... but building for linux and doing ./espruino --test-all might show it up.

I can't remember if this branch needs it, but you might want to edit build_platform_config and remove the RESIZABLE_JSVARS line.

@gfwilliams
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Killing this due to lack of interest - I guess variable_cache might still happen but honestly it's so easy to find boards with decent amounts of RAM/ROM built in now this isn't a big deal

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@tve @gfwilliams