[petsc-users] Strange behavior of -log_summary and final answer

[Barry Smith]

  Run with valgrind http://www.mcs.anl.gov/petsc/petsc-as/documentation/faq.html#valgrind

  Barry



On Feb 18, 2011, at 12:11 PM, Gaurish Telang wrote:

> Hi I am using petsc-3.1-p7. 
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> My code seems to be behaving strangely during the execution step. 
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> I am solving a simple least squares problem with the LSQR routine. The options that I am using at the terminal are.:
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> mpiexec -n 1 ./rect_input -f A2 -vector b2 -ksp_type lsqr -pc_type none -log_summary -ksp_max_it 1038
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> Even though I have used the -log_summary flag the performance summary does *not* get displayed on some occasions. The answer also is different from the answer I expect (which I obtain from matlab). 
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> But after running the executable twice or thrice, I get the performance summary along with the correct answer. Why is this happening? 
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