标签：level default value 列表 参数 MCA btl data
~]# ompi_info --param btl all --level 9
MCA btl: self (MCA v2.1.0, API v3.3.0, Component v5.0.5)
MCA btl: sm (MCA v2.1.0, API v3.3.0, Component v5.0.5)
MCA btl: tcp (MCA v2.1.0, API v3.3.0, Component v5.0.5)
MCA btl base: ---------------------------------------------------
MCA btl base: parameter "btl" (current value: "", data source: default, level: 2 user/detail, type: string)
Default selection set of components for the btl framework (<none> means use all components that can be found)
MCA btl base: ---------------------------------------------------
MCA btl base: parameter "btl_base_verbose" (current value: "error", data source: default, level: 8 dev/detail, type: int)
Verbosity level for the btl framework (default: 0)
Valid values: -1|none, 0|error, 10|component, 20|warn, 40|info, 60|trace, 80|debug, 100|max, 0-100
MCA btl base: parameter "btl_base_include" (current value: "", data source: default, level: 9 dev/all, type: string)
MCA btl base: parameter "btl_base_exclude" (current value: "", data source: default, level: 9 dev/all, type: string)
MCA btl base: parameter "btl_base_warn_peer_error" (current value: "true", data source: default, level: 9 dev/all, type: bool)
This parameter is used to turn on warning messages when peers disconnect unexpectedly
Valid values: 0|f|false|disabled|no|n, 1|t|true|enabled|yes|y
MCA btl base: parameter "btl_base_warn_component_unused" (current value: "1", data source: default, level: 9 dev/all, type: int)
This parameter is used to turn on warning messages when certain NICs are not used
MCA btl self: ---------------------------------------------------
MCA btl self: parameter "btl_self_free_list_num" (current value: "0", data source: default, level: 9 dev/all, type: int)
Number of fragments by default
MCA btl self: parameter "btl_self_free_list_max" (current value: "64", data source: default, level: 9 dev/all, type: int)
Maximum number of fragments
MCA btl self: parameter "btl_self_free_list_inc" (current value: "8", data source: default, level: 9 dev/all, type: int)
Increment by this number of fragments
MCA btl self: parameter "btl_self_exclusivity" (current value: "65536", data source: default, level: 7 dev/basic, type: unsigned_int)
BTL exclusivity (must be >= 0)
MCA btl self: informational "btl_self_atomic_flags" (current value: "", data source: default, level: 5 tuner/detail, type: unsigned_int)
BTL atomic support flags
Valid values: Comma-delimited list of: 0x1|add, 0x200|and, 0x400|or, 0x800|xor, 0x1000|land, 0x2000|lor, 0x4000|lxor, 0x10000|swap, 0x100000|min, 0x200000|max, 0x10000000|compare-and-swap, 0x20000000|global
MCA btl self: parameter "btl_self_rndv_eager_limit" (current value: "131072", data source: default, level: 4 tuner/basic, type: size_t)
Size (in bytes, including header) of "phase 1" fragment sent for all large messages (must be >= 0 and <= eager_limit)
MCA btl self: parameter "btl_self_eager_limit" (current value: "1024", data source: default, level: 4 tuner/basic, type: size_t)
Maximum size (in bytes, including header) of "short" messages (must be >= 1).
MCA btl self: parameter "btl_self_get_limit" (current value: "18446744073709551615", data source: default, level: 4 tuner/basic, type: size_t)
Maximum size (in bytes) for btl get
MCA btl self: parameter "btl_self_get_alignment" (current value: "0", data source: default, level: 6 tuner/all, type: size_t)
Alignment required for btl get
MCA btl self: parameter "btl_self_put_limit" (current value: "18446744073709551615", data source: default, level: 4 tuner/basic, type: size_t)
Maximum size (in bytes) for btl put
MCA btl self: parameter "btl_self_put_alignment" (current value: "0", data source: default, level: 6 tuner/all, type: size_t)
Alignment required for btl put
MCA btl self: parameter "btl_self_accelerator_max_send_size" (current value: "0", data source: default, level: 4 tuner/basic, type: size_t)
Maximum size (in bytes) of a single GPU "phase 2" fragment of a long message when using the pipeline protocol (must be >= 1) (only valid on smcuda btl)
MCA btl self: parameter "btl_self_max_send_size" (current value: "16384", data source: default, level: 4 tuner/basic, type: size_t)
Maximum size (in bytes) of a single "phase 2" fragment of a long message when using the pipeline protocol (must be >= 1)
MCA btl self: parameter "btl_self_rdma_pipeline_send_length" (current value: "2147483647", data source: default, level: 4 tuner/basic, type: size_t)
Length of the "phase 2" portion of a large message (in bytes) when using the pipeline protocol. This part of the message will be split into fragments of size max_send_size and sent using send/receive semantics (must be >= 0; only relevant when the PUT flag is set)
MCA btl self: parameter "btl_self_rdma_pipeline_frag_size" (current value: "2147483647", data source: default, level: 4 tuner/basic, type: size_t)
Maximum size (in bytes) of a single "phase 3" fragment from a long message when using the pipeline protocol. These fragments will be sent using RDMA semantics (must be >= 1; only relevant when the PUT flag is set)
MCA btl self: parameter "btl_self_min_rdma_pipeline_size" (current value: "2147484671", data source: default, level: 4 tuner/basic, type: size_t)
Messages smaller than this size (in bytes) will not use the RDMA pipeline protocol. Instead, they will be split into fragments of max_send_size and sent using send/receive semantics (must be >=0, and is automatically adjusted up to at least (eager_limit+btl_rdma_pipeline_send_length); only relevant when the PUT flag is set)
MCA btl self: parameter "btl_self_latency" (current value: "0", data source: default, level: 5 tuner/detail, type: unsigned_int)
Approximate latency of interconnect (0 = auto-detect value at run-time [not supported in all BTL modules], >= 1 = latency in microseconds)
MCA btl self: parameter "btl_self_bandwidth" (current value: "100", data source: default, level: 5 tuner/detail, type: unsigned_int)
Approximate maximum bandwidth of interconnect (0 = auto-detect value at run-time [not supported in all BTL modules], >= 1 = bandwidth in Mbps)
MCA btl sm: ---------------------------------------------------
MCA btl sm: parameter "btl_sm_free_list_num" (current value: "8", data source: default, level: 9 dev/all, type: int, synonyms: btl_vader_free_list_num)
Initial number of fragments to allocate for shared memory communication.
MCA btl sm: parameter "btl_sm_free_list_max" (current value: "512", data source: default, level: 9 dev/all, type: int, synonyms: btl_vader_free_list_max)
Maximum number of fragments to allocate for shared memory communication.
MCA btl sm: parameter "btl_sm_free_list_inc" (current value: "64", data source: default, level: 9 dev/all, type: int, synonyms: btl_vader_free_list_inc)
Number of fragments to create on each allocation.
MCA btl sm: parameter "btl_sm_memcpy_limit" (current value: "524288", data source: default, level: 5 tuner/detail, type: int, synonyms: btl_vader_memcpy_limit)
Message size to switch from using memmove to memcpy. The relative speed of these two routines can vary by size.
MCA btl sm: parameter "btl_sm_segment_size" (current value: "16777216", data source: default, level: 5 tuner/detail, type: int, synonyms: btl_vader_segment_size)
Maximum size of all shared memory buffers (default: 16M)
MCA btl sm: parameter "btl_sm_max_inline_send" (current value: "256", data source: default, level: 5 tuner/detail, type: unsigned_int, synonyms: btl_vader_max_inline_send)
Maximum size to transfer using copy-in copy-out semantics
MCA btl sm: parameter "btl_sm_fbox_threshold" (current value: "16", data source: default, level: 5 tuner/detail, type: unsigned_int, synonyms: btl_vader_fbox_threshold)
Number of sends required before an eager send buffer is setup for a peer (default: 16)
MCA btl sm: parameter "btl_sm_fbox_max" (current value: "32", data source: default, level: 5 tuner/detail, type: unsigned_int, synonyms: btl_vader_fbox_max)
Maximum number of eager send buffers to allocate (default: 32)
MCA btl sm: parameter "btl_sm_fbox_size" (current value: "4096", data source: default, level: 5 tuner/detail, type: unsigned_int, synonyms: btl_vader_fbox_size)
Size of per-peer fast transfer buffers (default: 4k)
MCA btl sm: parameter "btl_sm_backing_directory" (current value: "/dev/shm", data source: default, level: 3 user/all, type: string, synonyms: btl_vader_backing_directory)
Directory to place backing files for shared memory communication. This directory should be on a local filesystem such as /tmp or /dev/shm (default: (linux) /dev/shm, (others) session directory)
MCA btl sm: parameter "btl_sm_exclusivity" (current value: "65536", data source: default, level: 7 dev/basic, type: unsigned_int, synonyms: btl_vader_exclusivity)
BTL exclusivity (must be >= 0)
MCA btl sm: parameter "btl_sm_flags" (current value: "send,inplace", data source: default, level: 5 tuner/detail, type: unsigned_int, synonyms: btl_vader_flags)
BTL bit flags (general flags: send, put, get, in-place, hetero-rdma, atomics, fetching-atomics)
Valid values: Comma-delimited list of: 0x1|send, 0x2|put, 0x4|get, 0x8|inplace, 0x4000|signaled, 0x8000|atomics, 0x10000|fetching-atomics, 0x20000|static, 0x400|accelerator-put, 0x800|accelerator-get, 0x1000|accelerator-async-send, 0x2000|accelerator-async-recv, 0x200|failover, 0x10|need-ack, 0x20|need-csum, 0x100|hetero-rdma, 0x80000|rdma-flush, 0x100000|put-am, 0x200000|get_am, 0x400000|atomic-am
MCA btl sm: informational "btl_sm_atomic_flags" (current value: "", data source: default, level: 5 tuner/detail, type: unsigned_int, synonyms: btl_vader_atomic_flags)
BTL atomic support flags
Valid values: Comma-delimited list of: 0x1|add, 0x200|and, 0x400|or, 0x800|xor, 0x1000|land, 0x2000|lor, 0x4000|lxor, 0x10000|swap, 0x100000|min, 0x200000|max, 0x10000000|compare-and-swap, 0x20000000|global
MCA btl sm: parameter "btl_sm_rndv_eager_limit" (current value: "32768", data source: default, level: 4 tuner/basic, type: size_t, synonyms: btl_vader_rndv_eager_limit)
Size (in bytes, including header) of "phase 1" fragment sent for all large messages (must be >= 0 and <= eager_limit)
MCA btl sm: parameter "btl_sm_eager_limit" (current value: "4096", data source: default, level: 4 tuner/basic, type: size_t, synonyms: btl_vader_eager_limit)
Maximum size (in bytes, including header) of "short" messages (must be >= 1).
MCA btl sm: parameter "btl_sm_accelerator_max_send_size" (current value: "0", data source: default, level: 4 tuner/basic, type: size_t, synonyms: btl_vader_accelerator_max_send_size)
Maximum size (in bytes) of a single GPU "phase 2" fragment of a long message when using the pipeline protocol (must be >= 1) (only valid on smcuda btl)
MCA btl sm: parameter "btl_sm_max_send_size" (current value: "32768", data source: default, level: 4 tuner/basic, type: size_t, synonyms: btl_vader_max_send_size)
Maximum size (in bytes) of a single "phase 2" fragment of a long message when using the pipeline protocol (must be >= 1)
MCA btl vader: ---------------------------------------------------
MCA btl vader: parameter "btl_vader_free_list_num" (current value: "8", data source: default, level: 9 dev/all, type: int, synonym of: btl_sm_free_list_num)
Initial number of fragments to allocate for shared memory communication.
MCA btl vader: parameter "btl_vader_free_list_max" (current value: "512", data source: default, level: 9 dev/all, type: int, synonym of: btl_sm_free_list_max)
Maximum number of fragments to allocate for shared memory communication.
MCA btl vader: parameter "btl_vader_free_list_inc" (current value: "64", data source: default, level: 9 dev/all, type: int, synonym of: btl_sm_free_list_inc)
Number of fragments to create on each allocation.
MCA btl vader: parameter "btl_vader_memcpy_limit" (current value: "524288", data source: default, level: 5 tuner/detail, type: int, synonym of: btl_sm_memcpy_limit)
Message size to switch from using memmove to memcpy. The relative speed of these two routines can vary by size.
MCA btl vader: parameter "btl_vader_segment_size" (current value: "16777216", data source: default, level: 5 tuner/detail, type: int, synonym of: btl_sm_segment_size)
Maximum size of all shared memory buffers (default: 16M)
MCA btl vader: parameter "btl_vader_max_inline_send" (current value: "256", data source: default, level: 5 tuner/detail, type: unsigned_int, synonym of: btl_sm_max_inline_send)
Maximum size to transfer using copy-in copy-out semantics
MCA btl vader: parameter "btl_vader_fbox_threshold" (current value: "16", data source: default, level: 5 tuner/detail, type: unsigned_int, synonym of: btl_sm_fbox_threshold)
Number of sends required before an eager send buffer is setup for a peer (default: 16)
MCA btl vader: parameter "btl_vader_fbox_max" (current value: "32", data source: default, level: 5 tuner/detail, type: unsigned_int, synonym of: btl_sm_fbox_max)
Maximum number of eager send buffers to allocate (default: 32)
MCA btl vader: parameter "btl_vader_fbox_size" (current value: "4096", data source: default, level: 5 tuner/detail, type: unsigned_int, synonym of: btl_sm_fbox_size)
Size of per-peer fast transfer buffers (default: 4k)
MCA btl vader: parameter "btl_vader_backing_directory" (current value: "/dev/shm", data source: default, level: 3 user/all, type: string, synonym of: btl_sm_backing_directory)
Directory to place backing files for shared memory communication. This directory should be on a local filesystem such as /tmp or /dev/shm (default: (linux) /dev/shm, (others) session directory)
MCA btl vader: parameter "btl_vader_exclusivity" (current value: "65536", data source: default, level: 7 dev/basic, type: unsigned_int, synonym of: btl_sm_exclusivity)
BTL exclusivity (must be >= 0)
MCA btl vader: parameter "btl_vader_flags" (current value: "send,inplace", data source: default, level: 5 tuner/detail, type: unsigned_int, synonym of: btl_sm_flags)
BTL bit flags (general flags: send, put, get, in-place, hetero-rdma, atomics, fetching-atomics)
Valid values: Comma-delimited list of: 0x1|send, 0x2|put, 0x4|get, 0x8|inplace, 0x4000|signaled, 0x8000|atomics, 0x10000|fetching-atomics, 0x20000|static, 0x400|accelerator-put, 0x800|accelerator-get, 0x1000|accelerator-async-send, 0x2000|accelerator-async-recv, 0x200|failover, 0x10|need-ack, 0x20|need-csum, 0x100|hetero-rdma, 0x80000|rdma-flush, 0x100000|put-am, 0x200000|get_am, 0x400000|atomic-am
MCA btl vader: parameter "btl_vader_atomic_flags" (current value: "", data source: default, level: 5 tuner/detail, type: unsigned_int, synonym of: btl_sm_atomic_flags)
BTL atomic support flags
Valid values: Comma-delimited list of: 0x1|add, 0x200|and, 0x400|or, 0x800|xor, 0x1000|land, 0x2000|lor, 0x4000|lxor, 0x10000|swap, 0x100000|min, 0x200000|max, 0x10000000|compare-and-swap, 0x20000000|global
MCA btl vader: parameter "btl_vader_rndv_eager_limit" (current value: "32768", data source: default, level: 4 tuner/basic, type: size_t, synonym of: btl_sm_rndv_eager_limit)
Size (in bytes, including header) of "phase 1" fragment sent for all large messages (must be >= 0 and <= eager_limit)
MCA btl vader: parameter "btl_vader_eager_limit" (current value: "4096", data source: default, level: 4 tuner/basic, type: size_t, synonym of: btl_sm_eager_limit)
Maximum size (in bytes, including header) of "short" messages (must be >= 1).
MCA btl vader: parameter "btl_vader_accelerator_max_send_size" (current value: "0", data source: default, level: 4 tuner/basic, type: size_t, synonym of: btl_sm_accelerator_max_send_size)
Maximum size (in bytes) of a single GPU "phase 2" fragment of a long message when using the pipeline protocol (must be >= 1) (only valid on smcuda btl)
MCA btl vader: parameter "btl_vader_max_send_size" (current value: "32768", data source: default, level: 4 tuner/basic, type: size_t, synonym of: btl_sm_max_send_size)
Maximum size (in bytes) of a single "phase 2" fragment of a long message when using the pipeline protocol (must be >= 1)
MCA btl vader: parameter "btl_vader_major_version" (current value: "5", data source: default, level: 9 dev/all, type: int, synonym of: btl_sm_major_version)
MCA btl vader: parameter "btl_vader_minor_version" (current value: "0", data source: default, level: 9 dev/all, type: int, synonym of: btl_sm_minor_version)
MCA btl vader: parameter "btl_vader_release_version" (current value: "5", data source: default, level: 9 dev/all, type: int, synonym of: btl_sm_release_version)
MCA btl tcp: ---------------------------------------------------
MCA btl tcp: parameter "btl_tcp_links" (current value: "1", data source: default, level: 4 tuner/basic, type: unsigned_int)
MCA btl tcp: parameter "btl_tcp_if_include" (current value: "", data source: default, level: 1 user/basic, type: string)
Comma-delimited list of devices and/or CIDR notation of networks to use for MPI communication (e.g., "eth0,192.168.0.0/16"). Mutually exclusive with btl_tcp_if_exclude.
MCA btl tcp: parameter "btl_tcp_if_exclude" (current value: "127.0.0.1/8,sppp", data source: default, level: 1 user/basic, type: string)
Comma-delimited list of devices and/or CIDR notation of networks to NOT use for MPI communication -- all devices not matching these specifications will be used (e.g., "eth0,192.168.0.0/16"). If set to a non-default value, it is mutually exclusive with btl_tcp_if_include.
MCA btl tcp: parameter "btl_tcp_free_list_num" (current value: "8", data source: default, level: 5 tuner/detail, type: int)
MCA btl tcp: parameter "btl_tcp_free_list_max" (current value: "-1", data source: default, level: 5 tuner/detail, type: int)
MCA btl tcp: parameter "btl_tcp_free_list_inc" (current value: "32", data source: default, level: 5 tuner/detail, type: int)
MCA btl tcp: parameter "btl_tcp_sndbuf" (current value: "0", data source: default, level: 4 tuner/basic, type: int)
The size of the send buffer socket option for each connection. Modern TCP stacks generally are smarter than a fixed size and in some situations setting a buffer size explicitly can actually lower performance. 0 means the tcp btl will not try to set a send buffer size.
MCA btl tcp: parameter "btl_tcp_rcvbuf" (current value: "0", data source: default, level: 4 tuner/basic, type: int)
The size of the receive buffer socket option for each connection. Modern TCP stacks generally are smarter than a fixed size and in some situations setting a buffer size explicitly can actually lower performance. 0 means the tcp btl will not try to set a receive buffer size.
MCA btl tcp: parameter "btl_tcp_endpoint_cache" (current value: "30720", data source: default, level: 4 tuner/basic, type: int)
The size of the internal cache for each TCP connection. This cache is used to reduce the number of syscalls, by replacing them with memcpy. Every read will read the expected data plus the amount of the endpoint_cache
MCA btl tcp: parameter "btl_tcp_use_nagle" (current value: "0", data source: default, level: 4 tuner/basic, type: int)
Whether to use Nagle's algorithm or not (using Nagle's algorithm may increase short message latency)
MCA btl tcp: parameter "btl_tcp_port_min_v4" (current value: "1024", data source: default, level: 2 user/detail, type: int)
The minimum port where the TCP BTL will try to bind (default 1024)
MCA btl tcp: parameter "btl_tcp_port_range_v4" (current value: "64511", data source: default, level: 2 user/detail, type: int)
The number of ports where the TCP BTL will try to bind (default 64511). This parameter together with the port min, define a range of ports where Open MPI will open sockets.
MCA btl tcp: parameter "btl_tcp_progress_thread" (current value: "0", data source: default, level: 1 user/basic, type: int)
MCA btl tcp: parameter "btl_tcp_warn_all_unfound_interfaces" (current value: "false", data source: default, level: 2 user/detail, type: bool)
Issue a warning for all unfound interfaces included in if_exclude
Valid values: 0|f|false|disabled|no|n, 1|t|true|enabled|yes|y
MCA btl tcp: parameter "btl_tcp_exclusivity" (current value: "100", data source: default, level: 7 dev/basic, type: unsigned_int)
BTL exclusivity (must be >= 0)
MCA btl tcp: parameter "btl_tcp_flags" (current value: "send,put,inplace,need-ack,need-csum,hetero-rdma", data source: default, level: 5 tuner/detail, type: unsigned_int)
BTL bit flags (general flags: send, put, get, in-place, hetero-rdma, atomics, fetching-atomics)
Valid values: Comma-delimited list of: 0x1|send, 0x2|put, 0x4|get, 0x8|inplace, 0x4000|signaled, 0x8000|atomics, 0x10000|fetching-atomics, 0x20000|static, 0x400|accelerator-put, 0x800|accelerator-get, 0x1000|accelerator-async-send, 0x2000|accelerator-async-recv, 0x200|failover, 0x10|need-ack, 0x20|need-csum, 0x100|hetero-rdma, 0x80000|rdma-flush, 0x100000|put-am, 0x200000|get_am, 0x400000|atomic-am
MCA btl tcp: informational "btl_tcp_atomic_flags" (current value: "", data source: default, level: 5 tuner/detail, type: unsigned_int)
BTL atomic support flags
Valid values: Comma-delimited list of: 0x1|add, 0x200|and, 0x400|or, 0x800|xor, 0x1000|land, 0x2000|lor, 0x4000|lxor, 0x10000|swap, 0x100000|min, 0x200000|max, 0x10000000|compare-and-swap, 0x20000000|global
MCA btl tcp: parameter "btl_tcp_rndv_eager_limit" (current value: "65536", data source: default, level: 4 tuner/basic, type: size_t)
Size (in bytes, including header) of "phase 1" fragment sent for all large messages (must be >= 0 and <= eager_limit)
MCA btl tcp: parameter "btl_tcp_eager_limit" (current value: "65536", data source: default, level: 4 tuner/basic, type: size_t)
Maximum size (in bytes, including header) of "short" messages (must be >= 1).
MCA btl tcp: parameter "btl_tcp_put_limit" (current value: "18446744073709551615", data source: default, level: 4 tuner/basic, type: size_t)
Maximum size (in bytes) for btl put
MCA btl tcp: parameter "btl_tcp_put_alignment" (current value: "0", data source: default, level: 6 tuner/all, type: size_t)
Alignment required for btl put
MCA btl tcp: parameter "btl_tcp_accelerator_max_send_size" (current value: "0", data source: default, level: 4 tuner/basic, type: size_t)
Maximum size (in bytes) of a single GPU "phase 2" fragment of a long message when using the pipeline protocol (must be >= 1) (only valid on smcuda btl)
MCA btl tcp: parameter "btl_tcp_max_send_size" (current value: "131072", data source: default, level: 4 tuner/basic, type: size_t)
Maximum size (in bytes) of a single "phase 2" fragment of a long message when using the pipeline protocol (must be >= 1)
MCA btl tcp: parameter "btl_tcp_rdma_pipeline_send_length" (current value: "131072", data source: default, level: 4 tuner/basic, type: size_t)
Length of the "phase 2" portion of a large message (in bytes) when using the pipeline protocol. This part of the message will be split into fragments of size max_send_size and sent using send/receive semantics (must be >= 0; only relevant when the PUT flag is set)
MCA btl tcp: parameter "btl_tcp_rdma_pipeline_frag_size" (current value: "2147482624", data source: default, level: 4 tuner/basic, type: size_t)
Maximum size (in bytes) of a single "phase 3" fragment from a long message when using the pipeline protocol. These fragments will be sent using RDMA semantics (must be >= 1; only relevant when the PUT flag is set)
MCA btl tcp: parameter "btl_tcp_min_rdma_pipeline_size" (current value: "196608", data source: default, level: 4 tuner/basic, type: size_t)
Messages smaller than this size (in bytes) will not use the RDMA pipeline protocol. Instead, they will be split into fragments of max_send_size and sent using send/receive semantics (must be >=0, and is automatically adjusted up to at least (eager_limit+btl_rdma_pipeline_send_length); only relevant when the PUT flag is set)
MCA btl tcp: parameter "btl_tcp_latency" (current value: "0", data source: default, level: 5 tuner/detail, type: unsigned_int)
Approximate latency of interconnect (0 = auto-detect value at run-time [not supported in all BTL modules], >= 1 = latency in microseconds)
MCA btl tcp: parameter "btl_tcp_bandwidth" (current value: "0", data source: default, level: 5 tuner/detail, type: unsigned_int)
Approximate maximum bandwidth of interconnect (0 = auto-detect value at run-time [not supported in all BTL modules], >= 1 = bandwidth in Mbps)
MCA btl tcp: parameter "btl_tcp_disable_family" (current value: "0", data source: default, level: 2 user/detail, type: int)
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From： https://www.cnblogs.com/honghu0420/p/18567621