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    SubjectRe: Many open/close on same files yeilds "No such file or directory".
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    On Mon, May 12, 2008 at 11:53:57AM +1000, Neil Brown wrote:
    > On Friday May 9, jesper@krogh.cc wrote:
    > >
    > > When I disabled the NFS-server and rand my "real-world" program on a
    > > single processor (make -j 1). It ran through fine. It basically
    > > gets around 20 million chunks out of differnet file and assemble the
    > > chuncks in a few other files. This processes more or less 5 individual
    > > sections, so make can run effectively with a concurrency of 5.
    >
    > (For linux-nfs readers: the problem is that repeatedly opening a given
    > file sometimes returns a ENOENT - http://lkml.org/lkml/2008/5/9/15).
    >
    > The mention of an NFS-server made my ears prick up...
    >
    > Do I understand correctly that the problem only occurs when you have
    > 48 clients hammering away at the filesystem in question?
    >
    > Could the clients be accessing the same file that you are experiencing
    > problems with? Or one of the directories in the path (if so, how
    > deep).
    >
    > How many different files to these 20 million chunks come from? And
    > how does that number compare with the first number from
    > grep dentry /proc/slabinfo
    > ??
    >
    > The NFS server does some slighty strange things with the dcache if the
    > object being access is not in the cache.
    >
    > Also, can get a few instances of
    > grep '^fh' /proc/nfs/rpc/nfsd

    I think you meant /proc/net/rpc/nfsd.

    --b.

    >
    > while things are going strange. The numbers are:
    > * fh <stale> <total-lookups> <anonlookups> <dir-not-in-dcache> <nondir-not-in-dcache>
    >
    > That will show us if it is looking for things that aren't in the
    > dcache.
    >
    > Finally, if the filesystem export with "subtree_check" or
    > "nosubtree_check"?
    > Does it make a difference if you switch the setting of this flag and
    > re-export?
    >
    > NeilBrown
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