The ABINIT Users Mailing List ( CLOSED )

["Sun Hong" <hsun@sjtu.edu.cn>]

Dear abinit users:

     We are considering to buy a PC cluster with 32 CPUs connected by the Gb
Ethernets. The following is a test run report from the computer company. It
seems that abinit can not run well on PC clusters connected with Gb Ethernets.
Or is it because the optimization options used in the compilation flags are 
not appropriate? Any suggestions and comments are greatly appreciated.

Best

Hong


--------------------------------
Test run report:

Abinit version: 4.0.4
Platform : Cluster of 32 dual Intel Pentium-4 Xeon 2.60 MHz
           processors connected by Myrinet and Gb Ethernet
OS : Mandrake 9.0, Linux version 2.4.19
MPICH : ch_p4 version 1.2.5
Compiler : Intel(R) Fortran Compiler for 32-bit applications, Version 7.1
Compilation flags used : -FR -O3 -w -tpp7 -axW
Pre-processor : cpp (GCC) 3.2 
Pre-processor flag used : -P -traditional -D__IFC -DCHGSTDIO

------- benchmark for Myrinet --------------

CPUs   duration    speedup
       (seconds)
 1*1      8546       1.00

 4*2      1347       6.34
 8*1      1151       7.42

 8*2       733      11.66
16*1       640      13.35

16*2       447      19.12
32*1       368      23.22

------- benchmark for Gb Ethernet --------------

1*1      8546       1.00 

8*1      8711       0.98
 
16*1     8880       0.96

16*2    10670       0.80

------------------------------------------------------
Note: n*m, the number of CPUs
      n, the number of nodes
      m, the number of CPUs per node
------------------------------------------------------

Problem does NOT scale on Gigabit

        

　　　　　　　　致
礼！
                                

　　　　　　　　Sun Hong
　　　　　　　　hsun@sjtu.edu.cn
　　　　　　　　　　2003-09-18