Hi Suresh I'm new to Quantum_Espresso, but how many processes you specify when running the command (the "-procs" option with "poe", the "-n or -np" with "mpirun/mpiexec")? How many cores does your cluster support? Because I don't think the "-ni and -nk" options will distribute the processes by themselves.
Regards On Tue, Aug 11, 2015 at 1:01 PM, Suresh A <[email protected]> wrote: > Respected Sir/Friends, > I have formed a PC beowulf cluster (X86_64 old PC's > made on 2007) and installed quantum espresso-5.2.0 in it. Now the cluster > is running very slowly than the single core i5 processor, DDR3 RAM with > 1600MHZ speed. The following is my observation in single core i5 processor > and in beowulf cluster for the titanium dioxide supercell of size 2x2x1. > One more thing is, in cluster every node has 2GB DDR2 RAM with speed 667 > MHZ. for i5 processor 8GB with 1600 HZ. > > total cpu time spent upto now is 408.7 secs (for i5 CPU having > 1600MHZ) > > total cpu time spent upto now is it is keepon running more than 1 hour > (for one single processor in PC cluster) > > total cpu time spent upto now is 1402 secs ( for -ni 10 -nk 10 in PC > cluster) > > > > Is this due to RAM speed, size or anything else? > > Looking forward to your valuable suggestions > > With Regards, > A.Suresh, > Research Scholar, > Madurai Kamaraj University, > Madurai. > > _______________________________________________ > Pw_forum mailing list > [email protected] > http://pwscf.org/mailman/listinfo/pw_forum > -- Mohammed
_______________________________________________ Pw_forum mailing list [email protected] http://pwscf.org/mailman/listinfo/pw_forum
