send_block_offset  500 ompi/mca/coll/base/coll_base_allreduce.c         const int send_block_offset =
send_block_offset  512 ompi/mca/coll/base/coll_base_allreduce.c         tmpsend = (char*)rbuf + (ptrdiff_t)send_block_offset * extent;
send_block_offset  820 ompi/mca/coll/base/coll_base_allreduce.c         const int send_block_offset =
send_block_offset  832 ompi/mca/coll/base/coll_base_allreduce.c         tmpsend = (char*)rbuf + (ptrdiff_t)send_block_offset * extent;