<div>Hi,</div>
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<div>I am solving a poisson eqn and using hypre as a preconditioner has greatly increased the speed. I am trying to do some more tuning and I have some questions:</div>
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<div>1. Is boomerAMG the only option? What are the other hypre conditioners available? Is there any documentation somewhere? Is hypre just a preconditioner or can it be a solver as well?</div>
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<div>2. what does the preonly in ksp_type mean? Is the eqns solved?</div>
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<div>3. why can't I use bcgs or bicg with hypre? Also, can cg be used for non-symmetric matrix. It seems to work.</div>
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<div>Thank you very much.</div>
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<div>Regards.</div>