Re: [Paracomp-users] Making samples single node friendly

[Kumar, S. (STSD) <shr...@hp...>]

Hi Balazs,

> Indeed, but I think the whole related SVA calls could be unified into
a unified "platform".=20
> [snip]
> run-sample-sva <app-exe-name> <host1> <host2> ...
> run-sample-shell <app-exe-name> <host1> <host2> ...
> (separate "unified" scripts)
>
> or
>
> run-sample --sva <app-exe-name> <host1> <host2> ...
> run-sample --shell <app-exe-name> <host1> <host2> ...
> (one huge unified script)

<host1> <host2> ... options probably don't apply to SVA, since SVA
allocates nodes on the fly. For a small cluster, it is not unreasonable
for the user to know which nodes are free. The equivalent for SVA could
be <I_want_to_use_N_GPUS_somehow> :-)

However, this is a good goal to keep. An even simplified syntax could be
:

run-sample <app-exe-name> <host1> <host2>
OR
run-sample <app-exe-name> <on_N_GPUs_somehow>

and the script determines the environment and does the right thing :-)

> The main points are that not only the application source should be
portable but the execution environment should > be unified. Summarizing,
when one writes a new application using paracomp then (s)he would only
have to write
> the application in a protable way and would not have to bother with
setting up the launch scripts for one or
> more enviroments.

Don't you think this would be a large undertaking ? I intended to create
a small script framework _only_ for sample apps. Real world apps
probably want to use their own mechanisms, since they could have other
dependencies!

>> Does the composited result show up properly if the render windows=20
>> overlap ? If so, then I need to look at this sometime.
> Do it does not (see the attachment). I had remembered so, but is does
not.

Thanks for this information. There are ways to show the user what's
going on.  One thing we could do is : we could render on FBOs and copy
the color buffer to the framebuffer (possibly with scaling). This would
result in a performance hit. But more importantly, it complicates the
sample code, so I am a bit reluctant to do this.

Regards
-- Shree