[mvapich-discuss] Parameters for build

[LEI CHAI]

Dr. Potts,

Thank you for trying out MVAPICH 0.9.9 with uDAPL. The answers are inline below:

>    (1) What are the rough limits for cluster sizes in the build 
> script        prompt for "small", "medium", and "large" and does 
> choosing the
>        inappropriate size have major or minor consequences in
>        performance or does one hit limits in the app being able to
>        work at all?

You can choose "small" if your cluster size is smaller than 256, and "medium" if 256-1024, and "large" if larger than 1024. Generally speaking, "small" configuration will deliver best performance, while "medium" and "large" configurations are more scalable. They should all work though.  

>    (2) For what reason would one choose to _not_ define the -D_SMP_
>        and -D_SMP_RNDV_ CFLAG parameters in the build?
>

Usually people should always define D_SMP_ and -D_SMP_RNDV_ flags.

>    (3) Are there performance or other issues associated with
>        the --enable-sharedlib and --enable-debug parameters in the
>        configure, i.e. why are these not set as default options in
>        the build?

There should be no issue with --enable-sharedlib. We will consider to set it by default in future releases. However, you may want to not set--enable-debug if you want to get the best performance.

Thanks.
Lei

 

>    Thanks.
>           regards,
> -- 
> ***********************************
> >> Mark J. Potts, PhD
> >>
> >> HPC Applications Inc.
> >> phone: 410-992-8360 Bus
> >>        410-313-9318 Home
> >>        443-418-4375 Cell
> >> email: potts at hpcapplications.com
> >>        potts at excray.com
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