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--- src/buffer.cpp.orig 2018-07-11 01:24:59.809896000 +0000
+++ src/buffer.cpp 2018-07-11 01:25:29.007975000 +0000
@@ -48,7 +48,7 @@ MMapBuffer::MMapBuffer(int fd, offset_t offset, zsize_
#if defined(__APPLE__)
#define MAP_FLAGS MAP_PRIVATE
#else
- #define MAP_FLAGS MAP_PRIVATE|MAP_POPULATE
+ #define MAP_FLAGS MAP_PRIVATE|MAP_PREFAULT_READ
#endif
_data = (char*)mmap(NULL, size.v + _offset.v, PROT_READ, MAP_FLAGS, fd, pa_offset.v);
if (_data == MAP_FAILED )
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