Status: New
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 256 by [email protected]: [patch] decrease resident
memory usage.
http://code.google.com/p/address-sanitizer/issues/detail?id=256
Hi,
Here is a patch that helps decreasing ASan's memory usage. On my use case,
this decrease memory consumption by 20% with no noticeable performance
impact (in fact, it seems the resulting process is marginally faster).
The idea here is to clear memory using a fixed mmap instead of memset since
both will result in zeroed memory but mmap memory is not resident before
someone writes something in it. This also could result in faster code for
large clear since memset scans the memory and mmap only change the virtual
address map, however while memset runs in userland, mmap implies performing
a syscall that will take a lock to modify a shared (between threads)
resource.
Attachments:
0001-asan-reduce-resident-memory-consumption.patch 2.1 KB
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