SHMMAX

Dave Johnson ddj at cascv.brown.edu
Tue Jul 17 19:07:15 EDT 2001


On Tue, Jul 17, 2001 at 05:53:41PM -0400, Greg Lindahl wrote:
> On Tue, Jul 17, 2001 at 04:08:23PM -0500, Carlos Ernesto Lopez Nataren wrote:
> 
> > bpsh -a echo "134217728" > /proc/sys/kernel/shmmax
> 
> Try:
> 
> bpsh -a "echo 134217728 > /proc/sys/kernel/shmmax"
> 
> It matters where the > gets expanded.. and recall that bpsh's stdout
> gets hooked up to /dev/null on remote nodes, so with the "" in the
> wrong place absolutely nothing happens.
> 
> g
> 
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Not quite...

Bpsh does not run a shell on the other side unless you specifically tell it
to -- your example just passes the whole command string in argv[0].

This would work:
bpsh -a /bin/bash -c "echo 134217728 > /proc/sys/kernel/shmmax"'

Better yet:
bpsh -a sysctl -w kernel/shmmax=134217728
or
bpsh -a sysctl -w kernel.shmmax=134217728
(redirect local stdout to /dev/null to get rid of the
"kernel.shhmax = 134217728" response from sysctl if desired).

Cheers,

	-- ddj

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