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Subject: Re: [OMPI users] BLCR support not building on 1.5.3
From: Bill Johnstone (beejstone3_at_[hidden])
Date: 2011-05-27 15:54:25


Hello,

Thank you very much for this.  I've replied further below:

----- Original Message -----
> From: Joshua Hursey <jjhursey_at_[hidden]>
[...]
> What other configure options are you passing to Open MPI? Specifically the
> configure test will always fail if '--with-ft=cr' is not specified - by
> default Open MPI will only build the BLCR component if C/R FT is requested by
> the user.

This was it!  Now the BLCR supports builds in just fine.

If I may offer some feedback:

When I think "Checkpoint/Restart", I don't immediately think "Fault Tolerance"; rather, I'm interested in it for a better alternative to suspend/resume.  So I had *no* idea turning on the "ft" configure option this was a prerequisite for BLCR support to compile from just reading the configure help, configure output, docs, etc.

I'd like to request that this be made easier to spot.  At a minimum, the configure -help output could mention this when it gets to talking about BLCR, or C/R in general.

Additionally, in general when configuring components, it would be nice in the config logs if there was a way to get more details about the tests (and why they failed) than just "can compile...no".  This may require more invasive changes - not being super-knowledgeable about configure, I don't know how much work this would be.

Lastly, the standard Open MPI documentation (particularly the FAQ) could be updated in the C/R or BLCR sections to reflect the need for the "--with-ft=cr" argument.

Again, I really appreciate the assistance.