PETSC_LIB

[irfan.khan at gatech.edu]

Thank you for the helpful suggestions. Suppose blas/lapack are already installed on the cluster, what needs to be done in order for petsc to recognise them without having to reconfigure and reinstall.

Thank you
Irfan

----- Original Message -----
From: "Satish Balay" <balay at mcs.anl.gov>
To: "PETSc users list" <petsc-users at mcs.anl.gov>
Sent: Sunday, August 9, 2009 6:36:42 PM GMT -05:00 US/Canada Eastern
Subject: Re: PETSC_LIB

If the examples don't work [with the provided makefile] - you'll have
to check with the person who built this petsc for you..

Perhaps he needs to reinstall petsc - or just install blas/lapack for
this to work..

Satish

On Sun, 9 Aug 2009, irfan.khan at gatech.edu wrote:

> Thank for your reply Matt. I have tried to compile the src/dm/ao/examples/tutorials/ex2.c using the makefile provided in same directory. However I received the same error, i.e. 
> 
> ld: cannot find -llapack 
> make: [ex2] Error 1 (ignored) 
> 
> Please note that I was able to compile and run this example successfully before the an update was done on the system. 
> 
> I wanted to get some idea as to the cause of this link error. This way I have something to ask the team at Purdue to look into. 
> 
> Thank you 
> Irfan 
> 
> 
> ----- Original Message ----- 
> From: "Matthew Knepley" <knepley at gmail.com> 
> To: "PETSc users list" <petsc-users at mcs.anl.gov> 
> Sent: Friday, August 7, 2009 7:37:06 PM GMT -05:00 US/Canada Eastern 
> Subject: Re: PETSC_LIB 
> 
> The easiest way to link correctly is to use the PETSc makefile format: 
> 
> prog: file1.o file2.o 
> ${CLINKER} -o prog file1.o file2.o ${PETSC_SNES_LIB} 
> 
> Matt 
> 
> 
> On Fri, Aug 7, 2009 at 6:17 PM, < irfan.khan at gatech.edu > wrote: 
> 
> 
> Hi 
> I have been compiling and running my Petsc code on a TERAGRID cluster (Steele - Purdue) for sometime now. Recently they made changes to their operating system and also installed a clean version of Petsc (it now makes use of MPICH-2 instead of MPICH). 
> 
> However my make file is not successfully linking anymore. The error message I get is as follows. 
> 
> ld: cannot find -llapack 
> make: *** [te] Error 1 
> 
> I see that the blaslapack package is not available under "externalpackages" directory. I presume the link error is because the lapack library is included in the PETSC_LIB command and this library may not have been installed during PETSc installation. I say this because the make file works fine on my laptop where I have installed blas-lapack during PETSc installation. Please correct me if I am wrong. 
> 
> How can I resolve this link error? Kindly suggest. 
> 
> 
> Thank you 
> Irfan 
> 


-- 
PhD Candidate
G.W. Woodruff School of Mechanical Engineering
Georgia Institute of Technology
Atlanta, GA (30332)