hi chetan,
!!!!(what is being calculated, what kind of program is it master/
slave ?)!!!!
I am doing simulations to calculate some properties, say, energy. I
get different values of energies when number of nodes are increased.
eg. when i use 2 node, output= -223.5653426
4 node, output= -223.5659787
6 node, output= -223.5651216, clearly
different output of the "SAME PROGRAM" on "SAME OS SYSTEM".
But one MUST get same output (when i use "double precison" for
output ), irrespective of the number of nodes.
i am doing this over a WORKSTATION(Intel(R) Xeon(R) CPU E5520 @
2.27GHz) having 16 processors.
Message passing interface used is mpich2.1.2.1.
less /opt/cpuinfo gives following information...>
------------------------------------------------------------------------------------------------------------------------------------------------------
processor : 0 (.........like this, there are 15 processors
more.)
vendor_id : GenuineIntel
cpu family : 6
model : 26
model name : Intel(R) Xeon(R) CPU E5520 @ 2.27GHz
stepping : 5
cpu MHz : 1596.000
cache size : 8192 KB
physical id : 0
siblings : 8
core id : 0
cpu cores : 4
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx
rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl pni monitor
ds_cpl vmx est tm2 ssse3 cx16 xtpr dca sse4_1 sse4_2 popcnt lahf_lm
ida
bogomips : 4533.27
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual power management.
---------------------------------------------------------------------------------------------------------------------------------------
I think mpi(message passing interface) has bugs ? can you tell me how
mpi works? Because in parallel run, libraries of mpi are used.
i can provide you "config.log" file created after the compilation of
mpich2.1.2.1.
please tell me what, addition informatiom, i should provide you ?
with regards,
Sonu Kumar
Phd student
Physics Deptt.
IIT Delhi
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