I configured 3.2b3 with --enable-g=all --enable-error-messages=all --enable-error-checking=all Then I get: $ python test/runtests.py -q ---------------------------------------------------------------------- Ran 1018 tests in 7.253s OK [0] 20480 at [0x0000000002b3ed58], src/mpid/ch3/src/mpid_rma.c[382] [0] 20480 at [0x0000000002b38118], src/mpid/ch3/src/mpid_rma.c[382] [0] 20480 at [0x0000000002b70ad8], src/mpid/ch3/src/mpid_rma.c[382] [0] 20480 at [0x0000000002b6ba28], src/mpid/ch3/src/mpid_rma.c[382] [0] 20480 at [0x0000000002b60978], src/mpid/ch3/src/mpid_rma.c[382] [0] 20480 at [0x0000000002b5b8c8], src/mpid/ch3/src/mpid_rma.c[382] [0] 20480 at [0x0000000002b56818], src/mpid/ch3/src/mpid_rma.c[382] [0] 20480 at [0x0000000002b4c1c8], src/mpid/ch3/src/mpid_rma.c[382] So it seems MPI_Win's are leaking memory [ (*win_ptr)->lock_entry_pool_start ] -- Lisandro Dalcin ============ Research Scientist Computer, Electrical and Mathematical Sciences & Engineering (CEMSE) Numerical Porous Media Center (NumPor) King Abdullah University of Science and Technology (KAUST) http://numpor.kaust.edu.sa/ 4700 King Abdullah University of Science and Technology al-Khawarizmi Bldg (Bldg 1), Office # 4332 Thuwal 23955-6900, Kingdom of Saudi Arabia http://www.kaust.edu.sa Office Phone: +966 12 808-0459