I have prepared a fix for this in the branch barry/bugfix-petscformatconvert 
which comes from the master branch of PETSc.

   Unfortunately it requires many changes so cannot be back ported to previous 

   Thanks for reporting the problem,


> On Apr 11, 2018, at 6:17 PM, Rongliang Chen <> wrote:
> Dear All,
> When I tried to print a long string using PetscPrintf() I found that it 
> truncated the string. Attached is a simple example for this (run with single 
> processor). I used PetscPrintf() and printf() to print the same string and 
> the printf() seems OK. I am using petsc-3.8.4.
> Best,
> Rongliang
> <ex111.c>

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