[SCIP] Message: Cannot set feasibility tolerance to small value 1e-12 without GMP - using 1e-10

[Stefan Vigerske]

Hi,

SCIP (in particular lpi_spx2.cpp) needs to be compiled with 
SOPLEX_WITH_GMP defined to let it know that SoPlex has been build with 
GMP (I assume here that this was the case).
With the normal make, one would add USRCXXFLAGS=-DSOPLEX_WITH_GMP to the 
call of make for the SCIP library. I don't know how this is done with 
the cmake system, but you can probably figure that out, or just put a 
#define SOPLEX_WITH_GMP into src/lpi/lpi_spx2.cpp.

Stefan

On 4/14/20 4:33 PM, Stephen Mrenna wrote:
> Dear authors,
> 
> I have built SCIP and scipampl using cmake on a standard Linux platform.
> (i.e. from the build directory, I used cmake, make, and then make scipampl.
> Here is the full information printed out by scipampl:
> SCIP version 7.0.0 [precision: 8 byte] [memory: block] [mode: optimized] [LP solver: SoPlex 5.0.0] [GitHash: 0bc4dc9c65]
> Copyright (C) 2002-2020 Konrad-Zuse-Zentrum fuer Informationstechnik Berlin (ZIB)
> 
> External codes:
>    Readline 6.2         GNU library for command line editing (gnu.org/s/readline)
>    SoPlex 5.0.0         Linear Programming Solver developed at Zuse Institute Berlin (soplex.zib.de) [GitHash: 6535a3c8]
>    CppAD 20180000.0     Algorithmic Differentiation of C++ algorithms developed by B. Bell (www.coin-or.org/CppAD)
>    ZLIB 1.2.11          General purpose compression library by J. Gailly and M. Adler (zlib.net)
>    GMP 6.2.0            GNU Multiple Precision Arithmetic Library developed by T. Granlund (gmplib.org)
>    ASL                  AMPL Solver Library developed by D. Gay (www.netlib.com/ampl)
> 
> 
> number of parameters = 2607
> non-default parameter settings:
> numerics/feastol = 1e-12
> presolving/maxrounds = 0
> presolving/donotaggr = TRUE
> concurrent/presolvebefore = FALSE
> constraints/abspower/dualpresolve = FALSE
> heuristics/multistart/maxiter = 1000
> 
> During the run, I see the following message:
> Cannot set feasibility tolerance to small value 1e-12 without GMP - using 1e-10
> 
> How can I test if GMP was properly configured in the build?
> 
> Thank you,
> Steve
> 
> 
> 
> _______________________________________________
> Scip mailing list
> Scip at zib.de
> https://listserv.zib.de/mailman/listinfo/scip
>