On 03/08/2013 03:40 AM, Howard Chu wrote:
There is no way that a process that is accessing only 30GB of a mmap should be able to fill up 32GB of RAM. There's nothing else running on the machine, I've killed or suspended everything else in userland besides a couple shells running top and vmstat. When I manually drop_caches repeatedly, then eventually slapd RSS/SHR grows to 30GB and the physical I/O stops.
Is it possible that the kernel is doing some sort of automatic readahead, but it ends up reading pages corresponding to data that isn't ever queried and so doesn't get mapped by the application?
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