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Justin Ethier 2016-07-21 22:37:10 -04:00
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@ -165,22 +165,22 @@ During a GC cycle the collector thread transitions through the following states.
### Clear ### Clear
The collector swaps the values of the clear color (white) and the mark color (black). This is more efficient than modifying the color on each object in the heap. The collector then transitions to sync 1. At this point no heap objects are marked, as demonstrated below: The collector swaps the values of the clear color (white) and the mark color (black). This is more efficient than modifying the color on each object in the heap. The collector then transitions to sync 1. At this point no heap objects are marked, as demonstrated below:
<img src="images/gc-graph-clear.png" alt="Initial object graph"> <img class="doc" src="images/gc-graph-clear.png" alt="Initial object graph">
### Mark ### Mark
The collector transitions to sync 2 and then async. At this point it marks the global variables and waits for the mutators to also transition to async: The collector transitions to sync 2 and then async. At this point it marks the global variables and waits for the mutators to also transition to async:
<img src="images/gc-graph-mark.png" alt="Initial object graph"> <img class="doc" src="images/gc-graph-mark.png" alt="Initial object graph">
### Trace ### Trace
The collector finds all live objects using a breadth-first search and marks them black: The collector finds all live objects using a breadth-first search and marks them black:
<img src="images/gc-graph-trace.png" alt="Initial object graph"> <img class="doc" src="images/gc-graph-trace.png" alt="Initial object graph">
### Sweep ### Sweep
The collector scans the heap and frees memory used by all white objects: The collector scans the heap and frees memory used by all white objects:
<img src="images/gc-graph-sweep.png" alt="Initial object graph"> <img class="doc" src="images/gc-graph-sweep.png" alt="Initial object graph">
If the heap is still low on memory at this point the heap will be increased in size. Also, to ensure a complete collection, data for any terminated threads is not freed until now. If the heap is still low on memory at this point the heap will be increased in size. Also, to ensure a complete collection, data for any terminated threads is not freed until now.