linpack/hpl
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Ray Jones rjones at merl.comThu Sep 27 05:40:21 PDT 2001
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Greg Lindahl <lindahl at conservativecomputer.com> writes: > On Tue, Sep 25, 2001 at 08:22:41AM -0700, Shane Canon wrote: > > > We are adjusting the problem > > size and block size primarily. > > You need to set the problem size as large as possible. If it were too > small, you'd see exactly what you report, namely that above a certain > # of nodes, it begins to suck. Linpack is also be very sensitive to P and Q, the dimensions of the virtual grid that your nodes are organized into for the computation. In my experience (limited to 1 cluster), more square grids are best. Ray
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