Hi, Samuel Thibault, le Mon 06 Aug 2007 21:10:02 +0200, a écrit : > Also, something odd: say I have a big file /tmp/foo > > $ cat /tmp/foo > /dev/null > ... "inactive" grows in vmstat, takes some time... > $ cat /tmp/foo > /dev/null > takes almost no time since it's all cached. > $ find /var -printf "" > ... "inactive" falls down to the original value > $ cat /tmp/foo > /dev/null > ... "inactive" grows in vmstat again, takes some time... > > It looks like resolving directories/files entries somehow flushes out > the page cache. There actually doesn't seem to be any caching for > directories/files: find /var/log always reads from the disk (the led > flashes).
I've found the "problem": vm/vm_object.c:171: int vm_object_cached_max = 200; /* may be patched*/ Only 200 objects at a time may be held in memory. By nowadays' standards, that seems quite low. In the case I've raised (find /var), it's just not enough (the result can't fit into 200 objects). We should probably raise it in debian at least. Samuel _______________________________________________ Bug-hurd mailing list Bug-hurd@gnu.org http://lists.gnu.org/mailman/listinfo/bug-hurd
