Dylan T f8bfbc107d

Reduce chunk memory usage by 20-60% by exploiting PHP copy-on-write behaviour (#2527) ...

This takes advantage of two key behaviours of PHP:
1. Assigning a string does not copy the string
2. Changing an offset in a string causes the string to be copied.

These two factors combined, along with the fact that blocklight and skylight arrays are usually all-zeros, allow us to produce a significant memory usage reduction of loaded chunks.
A freshly generated PM world with 3,332 chunks loaded drops from 310MB to 200MB memory usage with these changes applied.

2018-11-17 14:46:05 +00:00

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pocketmine

Reduce chunk memory usage by 20-60% by exploiting PHP copy-on-write behaviour (#2527)

2018-11-17 14:46:05 +00:00