Mimir provides environment variables to set the library parameters.

Settings

• MIMIR_COMM_SIZE (default: 64M) — communication bufer size
• MIMIR_PAGE_SIZE (default: 64M) — data buffer unit size
• MIMIR_DISK_SIZE (default: 64M) — disk I/O buffer size
• MIMIR_BUCKET_SIZE (default: 1M) — hash bucket size used by reduce and combine phases
• MIMIR_MAX_RECORD_SIZE (default: 1M) — maximum length of any

<key,value> pair

• MIMIR_SHUFFLE_TYPE (default: a2av) — a2av: MPI_Alltoallv; ia2av: MPI_Ialltoallv
• MIMIR_MIN_COMM_BUF (default: 2) — if the shuffle type is ia2av, it sets the min communication buffer count
• MIMIR_MAX_COMM_BUF (default: 5) — if the suffle type is ia2av, it sets the max communication buffer count
• MIMIR_READ_TYPE (default: posix) — read type (posix; mpiio)
• MIMIR_WRITE_TYPE (default: posix) — write type (posix; mpiio)
• MIMIR_DIRECT_READ (default: off) — direct read
• MIMIR_DIRECT_WRITE (default: off) — direct write

Features

• MIMIR_WORK_STEAL (default: off) — enable/disable work stealing
• MIMIR_MAKE_PROGRESS (default: off) — enable/disable aggressive progress pushing during nonblocking communication
• MIMIR_BALANCE_LOAD (default: off) — enable/disable load balancing
• MIMIR_BIN_COUNT (default: 1000) — number of bins per process
• MIMIR_BALANCE_FACTOR (default: 1.5) — the balance factor
• MIMIR_BALANCE_FREQ (default: 1) — load balancing frequency
• MIMIR_USE_MCDRAM (default: off) — if use MCDRAM when there is MCDRAM
• MIMIR_LIMIT_POWER (default: off) — enable/disable power capping
• MIMIR_LIMIT_SCALE (default: 1.0) — power capping percentage (e.g. 1.0 means no power capping)

Stat & Debug

• MIMIR_OUTPUT_STAT (default: off) — output stat file
• MIMIR_OUTPUT_TRACE (default: off) — output trace file
• MIMIR_STAT_FILE (default: NULL) — stat file name
• MIMIR_DBG_ALL (default: off) — enable/disable debug message