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runtime: reserve 16GB of heap address space on 64-bit unix #5644

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runtime: reserve 16GB of heap address space on 64-bit unix #5644

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9 changes: 8 additions & 1 deletion src/runtime/runtime_unix.go
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Original file line number Diff line number Diff line change
Expand Up @@ -318,13 +318,20 @@ func procUnpin() {
var heapSize uintptr = 128 * 1024 // small amount to start
var heapMaxSize uintptr

// heapMaxReserve is the virtual address space reserved for the heap, 16GB on
// 64-bit targets and 1GB on 32-bit ones. Pages cost RAM only when touched.
//
// A flat 1GB cap made any allocation approaching 1GB fail regardless of
// system memory. The shift comes from TargetBits so 32-bit targets compile.
const heapMaxReserve = 1 << (30 + 4*(TargetBits/64))

var heapStart, heapEnd uintptr

func allocateHeap() {
// Allocate a large chunk of virtual memory. Because it is virtual, it won't
// really be allocated in RAM. Memory will only be allocated when it is
// first touched.
heapMaxSize = 1 * 1024 * 1024 * 1024 // 1GB for the entire heap
heapMaxSize = heapMaxReserve
for {
addr := mmap(nil, heapMaxSize, flag_PROT_READ|flag_PROT_WRITE, flag_MAP_PRIVATE|flag_MAP_ANONYMOUS, -1, 0)
if addr == unsafe.Pointer(^uintptr(0)) {
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