[Beowulf] nodes reserved but not used?

Ru-Zhen Li r.li at qmul.ac.uk
Wed Mar 8 06:54:49 EST 2006


Dear All,

I am having problem with reserved nodes not being used.

I used 

/home/hep/lrz/mpich2-install/bin/mpiexec -machinefile shortlist -n 16 ./DLPOLY.Y

and when I used

qstat -u ** -n

the result is lrz

fe03.htc.esc.qmul:
                                                            Req'd  Req'd   Elap
Job ID          Username Queue    Jobname    SessID NDS TSK Memory Time  S Time
--------------- -------- -------- ---------- ------ --- --- ------ ----- - -----
381114.fe03.htc lrz      verylong fixed-carb    --   16  -- 8000mb 3200: R 00:00
   cn123/3+cn123/2+cn123/1+cn123/0+cn016/1+cn016/0+cn015/1+cn015/0+cn014/1
   +cn014/0+cn013/1+cn013/0+cn012/1+cn012/0+cn011/1+cn011/0

but when I ssh to the nodes, and used

top

I found that some of the nodes are not being used. Does anybody have the same problem before? Am using MPICH2, could it be caused by MPICH?

Thanks a lot in advance!

Regards,

Ruzhen

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