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--- src/ipc/mem/Segment.cc.orig 2016-12-16 10:06:20 UTC
+++ src/ipc/mem/Segment.cc
@@ -173,7 +173,7 @@ Ipc::Mem::Segment::attach()
assert(theSize == static_cast<off_t>(static_cast<size_t>(theSize)));
void *const p =
- mmap(NULL, theSize, PROT_READ | PROT_WRITE, MAP_SHARED, theFD, 0);
+ mmap(NULL, theSize, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_NOSYNC, theFD, 0);
if (p == MAP_FAILED) {
int xerrno = errno;
debugs(54, 5, "mmap " << theName << ": " << xstrerr(xerrno));
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