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Added GC thresholds

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This commit is contained in:
Justin Ethier 2016-03-03 23:11:35 -05:00
parent fa933278a3
commit e034459e81
2 changed files with 20 additions and 5 deletions
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14
gc.c
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@ -864,9 +864,10 @@ void gc_mut_cooperate(gc_thread_data *thd, int buf_len)
// Threshold is intentially low because we have to go through an
// entire handshake/trace/sweep cycle, ideally without growing heap.
if (ck_pr_load_int(&gc_stage) == STAGE_RESTING &&
(cached_heap_free_size < (cached_heap_total_size * 0.10))){
(cached_heap_free_size < (cached_heap_total_size *
GC_COLLECTION_THRESHOLD))){
#if GC_DEBUG_TRACE
fprintf(stdout, "Less than 10%% of the heap is free, initiating collector\n");
fprintf(stdout, "Less than %f%% of the heap is free, initiating collector\n", 100.0 * GC_COLLECTION_THRESHOLD);
#endif
ck_pr_cas_int(&gc_stage, STAGE_RESTING, STAGE_CLEAR_OR_MARKING);
@ -1208,12 +1209,15 @@ fprintf(stderr, "DEBUG - after wait_handshake async\n");
total_size = cached_heap_total_size; //gc_heap_total_size(gc_get_heap());
total_free = cached_heap_free_size; //gc_heap_total_free_size(gc_get_heap());
if (total_free < (total_size * 0.10)) {
//TODO: want stats on how much of each heap page is used
while (total_free < (total_size * GC_FREE_THRESHOLD)) {
#if GC_DEBUG_TRACE
fprintf(stdout, "Less than 10%% of the heap is free, growing it\n",
total_free, total_size);
fprintf(stdout, "Less than %f%% of the heap is free, growing it\n",
100.0 * GC_FREE_THRESHOLD);
#endif
gc_grow_heap(gc_get_heap(), 0, 0);
total_size = cached_heap_total_size;
total_free = cached_heap_free_size;
}
#if GC_DEBUG_TRACE
fprintf(stderr, "sweep done, total_size = %zu, total_free = %d, freed = %d, max_freed = %d, elapsed = %ld\n",

11
include/cyclone/types.h
View file

@ -31,6 +31,17 @@
// Size of a "page" on the heap (the second generation), in bytes.
#define HEAP_SIZE (10 * 1024 * 1024)
/////////////////////////////
// Major GC tuning parameters
// Start GC cycle if % heap space free below this percentage
#define GC_COLLECTION_THRESHOLD 0.05
// After major GC, grow the heap so at least this percentage is free
#define GC_FREE_THRESHOLD 0.40
// END GC tuning
/////////////////////////////
// Number of functions to save for printing call history
#define MAX_STACK_TRACES 10