pmi_proxy process operates with a delay

Hi HPC Developers,
 We are having a Sandy Bridge cluster of 8 nodes having the following:

Hardware:
 1U rackmount enclosure
 Intel Xeon E5-2680v3 processor x 2ea
 128GB Memory
 5.5TB Pure Storage
 56Gbps Infiband switch

Software:
 CentOS 6.6 x64
 Intel® Parallel Studio XE 2015
 Intel MPI Library 5.0.3
 NFS share

In the following cases, operate normally.
1. If you run mpirun from the Terminal Console
2. If you perform a bash mpirun to child processes in a single-threaded program
3. If you perform a bash mpirun in the child process via a Thread in multi-threaded program

However, the operation is delayed in the following cases:
If you perform a bash mpirun in the child process at TCP service hosting program

Attach a reference document to help you understand the above.
Ask for advice on troubleshooting.