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/goPublic

Commitb3b1efd

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runtime: reduce max arena size on windows/amd64 to 32 GiB
Update#5236Update#5402This CL reduces gofmt's committed memory from 545864 KiB to 139568 KiB.Note: Go 1.0.3 uses about 70MiB.R=golang-dev, r, iant, nightlyoneCC=golang-devhttps://golang.org/cl/9245043
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‎src/pkg/runtime/malloc.h‎

Lines changed: 10 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -115,10 +115,18 @@ enum
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HeapAllocChunk=1<<20,// Chunk size for heap growth
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// Number of bits in page to span calculations (4k pages).
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// On 64-bit, we limit the arena to 128GB, or 37 bits.
118+
// On Windows 64-bit we limit the arena to 32GB or 35 bits (see below for reason).
119+
// On other 64-bit platforms, we limit the arena to 128GB, or 37 bits.
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// On 32-bit, we don't bother limiting anything, so we use the full 32-bit address.
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#ifdef_64BIT
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#ifdefGOOS_windows
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// Windows counts memory used by page table into committed memory
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// of the process, so we can't reserve too much memory.
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// See http://golang.org/issue/5402 and http://golang.org/issue/5236.
126+
MHeapMap_Bits=35-PageShift,
127+
#else
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MHeapMap_Bits=37-PageShift,
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#endif
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#else
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MHeapMap_Bits=32-PageShift,
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#endif
@@ -134,7 +142,7 @@ enum
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// This must be a #define instead of an enum because it
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// is so large.
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#ifdef_64BIT
137-
#defineMaxMem(1ULL<<(MHeapMap_Bits+PageShift))/* 128 GB */
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#defineMaxMem(1ULL<<(MHeapMap_Bits+PageShift))/* 128 GBor 32 GB*/
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#else
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#defineMaxMem((uintptr)-1)
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#endif

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