[Beowulf] max number of NFS threads: NFS config optimization
David N. Lombard
dnlombar at ichips.intel.com
Fri Dec 19 19:03:25 EST 2008
On Thu, Dec 18, 2008 at 12:59:06PM -0700, Rahul Nabar wrote:
> For a while I've been seeing errors of this sort in my /var/log/messages
> kernel: nfsd: too many open TCP sockets, consider increasing the number of
> nfsd threads
> I googled a bunch and think the solution might be to boost RPCNFSDCOUNT in
> the line "[ -z "$RPCNFSDCOUNT" ] && RPCNFSDCOUNT=8" in the file
> Question: This seems a suspicious place to change it. Isn't there a nfs
> config file somewhere else?
That would be a Bad Thing(TM). That line is looking to see if the shell
variable RPCNFSDCOUNT has a value set; if not, it sets a default value
Look up in the file. In my system (Fedora 7), this line is earlier in
[ -f /etc/sysconfig/nfs ] && . /etc/sysconfig/nfs
This line looks for the file /etc/sysconfig/nfs and sources it. So,
you would put a line that looks like
if you wanted to set the value to 16.
> Question2: How high can I boost the number of NFS threads? Or how I should
> I? Is there any metric I can track to decide an optimum number? Most
> recomendations were for 32, 64 or 128. What do people suggest? Any
> downsides to having numbers that are too high?
How many concurrent requests do you think you'll need to satisfy?
Try that number.
David N. Lombard, Intel, Irvine, CA
I do not speak for Intel Corporation; all comments are strictly my own.
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