[Coin-discuss] clp performance much worse with g++4.1 vs. g++4.0

Sun Dec 9 06:01:52 EST 2007

Stuart,

I am using g++ 4.1.2 and have not noticed any difference.

If you send me the file (and outputs from running with 4.0 and 4.1) I will
look at problem (if very large then put up somewhere on watgsa).

John Forrest

  From:       Stuart A Siegel/Watson/IBM at IBMUS                                                                                               

  To:         coin-discuss at list.coin-or.org                                                                                                  

  Date:       12/08/2007 04:57 PM                                                                                                            

  Subject:    [Coin-discuss] clp performance much worse with g++4.1 vs. g++4.0                                                               

Can someone (or a few of you) please help me confirm something?  When I
compile Clp with g++4.1.x and run bin/clp on a mps file I see rougly 3
times poorer performance than if clp is compiled with g++4.0.x.  The
compiler version is the only difference (i.e., all Clp compiler
configuration flags (the defaults) and the mps file are the same of couse).

I don't seem to be able to attach the mps file, please contact me at
stus__atsymbol__us.ibm.com and I'll send it to you if you're willing the
give this a try.  Thanks.

-----------------------------------------------------------------------------------------

Stuart Siegel - IBM TJ Watson Laboratory 33-238
(M) 914.396.9506 (H) 973.379.1810 (O) 914.945.1674

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