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Allocate in 16MB chunks, make creation of memory maps always aligned to 16MB chunks

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This commit is contained in:
j.laycock 2019-09-05 11:15:01 +01:00
parent 84f2dc3b53
commit 4257582db5
1 changed files with 12 additions and 5 deletions
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17
weed/storage/memory_map/memory_map_windows.go
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@ -38,19 +38,26 @@ var (
var system_info, err = getSystemInfo() var system_info, err = getSystemInfo()
var chunk_size = uint64(system_info.dwAllocationGranularity) * 512 var chunk_size = uint64(system_info.dwAllocationGranularity) * 256
func (mMap *MemoryMap) CreateMemoryMap(file *os.File, maxlength uint64) { func (mMap *MemoryMap) CreateMemoryMap(file *os.File, maxlength uint64) {
maxlength_high := uint32(maxlength >> 32) chunks := (maxlength / chunk_size)
maxlength_low := uint32(maxlength & 0xFFFFFFFF) if chunks*chunk_size < maxlength {
chunks = chunks + 1
}
alignedMaxLength := chunks * chunk_size
maxlength_high := uint32(alignedMaxLength >> 32)
maxlength_low := uint32(alignedMaxLength & 0xFFFFFFFF)
file_memory_map_handle, err := windows.CreateFileMapping(windows.Handle(file.Fd()), nil, windows.PAGE_READWRITE, maxlength_high, maxlength_low, nil) file_memory_map_handle, err := windows.CreateFileMapping(windows.Handle(file.Fd()), nil, windows.PAGE_READWRITE, maxlength_high, maxlength_low, nil)
if err == nil { if err == nil {
mMap.File = file mMap.File = file
mMap.file_memory_map_handle = uintptr(file_memory_map_handle) mMap.file_memory_map_handle = uintptr(file_memory_map_handle)
mMap.write_map_views = make([]MemoryBuffer, 0, maxlength/chunk_size) mMap.write_map_views = make([]MemoryBuffer, 0, alignedMaxLength/chunk_size)
mMap.max_length = maxlength mMap.max_length = alignedMaxLength
mMap.End_of_file = -1 mMap.End_of_file = -1
} }
} }