[petsc-dev] Seeking OLCF users complaining about poor build times

[Nathan Collier]

> They never told you to do compiles on particular file systems or
anything?  For example did they ever say DON'T compile on the lustre file
system?

I have not received any guidance about where to or not to compile. A quick
perusing of the user guide doesn't make that clear to me. If it isn't
already obvious, I am far from a Titan expert :)

Do you know someone here at ORNL who I can talk to to make sure I am not
missing something silly?

> Perhaps the 52m 'sys' time could be luster overhead

It could be, I have heard a lot of complaints about this from people who
need to write output or read from files in their applications.

Nate


On Thu, Feb 26, 2015 at 10:36 PM, Satish Balay <balay at mcs.anl.gov> wrote:

> On Thu, 26 Feb 2015, Barry Smith wrote:
>
> >
> > > On Feb 26, 2015, at 9:16 PM, Nathan Collier <
> nathaniel.collier at gmail.com> wrote:
> > >
> > > Barry,
> > >
> > > > Do you know where /tmp is on the system? Presumably it is fast?
> > >
> > > I am not sure about that. There is a /tmp but I am not sure what it is
> or if/how I can use it.
> >
> >    They never told you to do compiles on particular file systems or
> anything?  For example did they ever say DON'T compile on the lustre file
> system?
>
> Ah - I misunderstood earlier. You'd like to have a petsc clone in /tmp
> - and do the build there - and compare the difference [with the
> current luster build].
>
> Perhaps the 52m 'sys' time could be luster overhead - and that woud
> disappear with a petsc build in /tmp. [and could be much faster].
>
> Satish
>
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