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

[Gaurish Telang]

Hi I am using petsc-3.1-p7.

My code seems to be behaving strangely during the execution step.

I am solving a simple least squares problem with the LSQR routine. The
options that I am using at the terminal are.:

mpiexec -n 1 ./rect_input -f A2 -vector b2 -ksp_type lsqr -pc_type none
-log_summary -ksp_max_it 1038

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).

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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