[mpich-discuss] Clarification needed on running processes on MPICH2

[Anthony Chan]

If process A and B are launched by mpiexec, the time taken
by mpiexec should be max(t1,t2) not t1 + t2. As Rajeev said,
calling fflush(stdout) after each printf() is the fastest way
to get each process's stdout printed to your console. 

A.Chan
----- "Waruna Ranasinghe" <warunapww at gmail.com> wrote:

> Hi Rajeev,
> Actually this is not what I'm talking about.
> Say there are processes A and B
> Process A utilize 100% of the cpu while it runs. The answer will
> appear in
> t1 seconds
> Process B also utilize 100% of the cpu while it runs. The answer will
> appear
> in t2 seconds
> 
> When I run both the process A and B at the same time, The both answers
> will
> appear in t1 + t2 seconds. where as I want to get the Process A's
> answer
> first. (Here Process A is submitted before Process B)
> 
> Is there anything that I can do to make this happen.
> 
> Thank You,
> Waruna
> 
> 2008/11/26 Rajeev Thakur <thakur at mcs.anl.gov>
> 
> >  If you are refering to the output of "printf", you can try adding
> an
> > fflush(stdout) after the printf. You don't have much control over
> the order
> > in which it is printed from different processes.
> >
> > Rajeev
> >
> >  ------------------------------
> > *From:* mpich-discuss-bounces at mcs.anl.gov [mailto:
> > mpich-discuss-bounces at mcs.anl.gov] *On Behalf Of *Waruna Ranasinghe
> > *Sent:* Tuesday, November 25, 2008 1:35 AM
> > *To:* mpich-discuss at mcs.anl.gov
> > *Subject:* [mpich-discuss] Clarification needed on running processes
> on
> > MPICH2
> >
> > Hi all,
> > I submitted 3 processes at the same time using mpiexec. the results
> of each
> > process appears only after all the processes have finished. (I guess
> that
> > the way mpich schedule it).
> > What if I want to get the result of the process, which was submitted
> first,
> > first. (like first in first out).
> >
> > I use MPICH2 cluster in Fedora 8 (with mpd)
> >
> > Thank you.
> > Waruna Ranasinghe
> >
> >