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Turn off readahead on main mmap

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It's harmful when the DB is larger than RAM.
This commit is contained in:
Howard Chu 2013-03-11 05:49:14 -07:00
parent d74330128a
commit b1da555c4c
1 changed files with 2 additions and 0 deletions
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libraries/liblmdb/mdb.c
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@ -2870,6 +2870,8 @@ mdb_env_open2(MDB_env *env)
env->me_map = NULL;
return ErrCode();
}
/* Turn off readahead. It's harmful when the DB is larger than RAM. */
posix_madvise(env->me_map, env->me_mapsize, POSIX_MADV_RANDOM);
#endif
if (newenv) {