Hello , everyone
 Thanks for your kind advice.
 Of course, I have not ignored those three posts.And I have accepted their 
suggestions.
 And I'm very sorry I bother everybody again.
 I think I have compiled both float and double precision for fftw.
 And I just choose to compile double precision for gromacs.
 Do Mark's means that I must compile gromacs in both float and double precision 
?
 But I don't think that is essential. Because I have successfully compiled(both 
parallel version and single thread version) gromacs on another computer(it's a 
cluster) in this way.
  
 So, I think this is a problem of this computer.
 Altix450 have 8 compute nodes ,each node have two Itanium2 64bit Dual Cores 
CPU.
 And it is a machine of shared memery.
  
 Now, I am trying  Carsten's advice, I  hope it can work normally.
  
 Thanks everyone's good advice again.
 Best wishes.
  
 Wenping Lv
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