Default number of threads is 1 in new testing

When running mpirun -n 2 -nodelist jack0,jack1 -DSTARPU_FXT_TRACE=1 -DSTARPU_FXT_PREFIX=$(pwd)/ ~/chameleon/build/new-testing/snew-testing -o potrf -H, I get the following output:

# jack0: WARNING- InfinibandVerbs: device = mlx4_0; port 2 is not active.
# jack1: WARNING- InfinibandVerbs: device = mlx4_0; port 2 is not active.
[starpu][starpu_initialize] Warning: StarPU was configured with --with-fxt, which slows down a bit, limits scalability and makes worker initialization sequential
[starpu][starpu_initialize] Warning: StarPU was configured with --with-fxt, which slows down a bit, limits scalability and makes worker initialization sequential
# pioman: WARNING- Ignoring call to piom_ltask_set_bound_thread_indexes as PIOM_DEDICATED_WAIT=0.
 Id Function     threads gpus  P  Q  nb uplo        n   lda       seedA          time        gflops
# pioman: WARNING- Ignoring call to piom_ltask_set_bound_thread_indexes as PIOM_DEDICATED_WAIT=0.
  0 spotrf             1    0  1  2 320 Upper    1000  1000  1804289383  1.952684e-02  1.709614e+01
Connection to jack1 closed.

The default number of used threads is 1. In previous timing binaries, it was by default the number of workers allowed by StarPU. If I precise -t [x], the provided number of threads is well used.

Is it a bug ?