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runtime: use manual stack for garbage collection

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Old code was using recursion to traverse object graph.
New code uses an explicit stack, cutting the per-pointer
footprint to two words during the recursion and avoiding
the standard allocator and stack splitting code.

in test/garbage:

Reduces parser runtime by 2-3%
Reduces Peano runtime by 40%
Increases tree runtime by 4-5%

R=r
CC=golang-dev
https://golang.org/cl/2150042
This commit is contained in:
Russ Cox 2010-09-07 09:57:22 -04:00
parent 6f5f558c10
commit d4cc557b0d
20 changed files with 217 additions and 78 deletions
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9
src/pkg/runtime/debug.go
View file

@ -36,10 +36,11 @@ type MemStatsType struct {
Mallocs uint64 // number of mallocs
// Main allocation heap statistics.
HeapAlloc uint64 // bytes allocated and still in use
HeapSys uint64 // bytes obtained from system
HeapIdle uint64 // bytes in idle spans
HeapInuse uint64 // bytes in non-idle span
HeapAlloc uint64 // bytes allocated and still in use
HeapSys uint64 // bytes obtained from system
HeapIdle uint64 // bytes in idle spans
HeapInuse uint64 // bytes in non-idle span
HeapObjects uint64 // total number of allocated objects
// Low-level fixed-size structure allocator statistics.
// Inuse is bytes used now.