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Filename : help-mpi-btl-openib.txt
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# -*- text -*-
#
# Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
#                         University Research and Technology
#                         Corporation.  All rights reserved.
# Copyright (c) 2004-2005 The University of Tennessee and The University
#                         of Tennessee Research Foundation.  All rights
#                         reserved.
# Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
#                         University of Stuttgart.  All rights reserved.
# Copyright (c) 2004-2006 The Regents of the University of California.
#                         All rights reserved.
# Copyright (c) 2006-2011 Cisco Systems, Inc.  All rights reserved.
# Copyright (c) 2007-2009 Mellanox Technologies. All rights reserved.
# Copyright (c) 2009      Sun Microsystems, Inc.  All rights reserved.
# Copyright (c) 2013-2014 NVIDIA Corporation.  All rights reserved.
# Copyright (c) 2018      Los Alamos National Security, LLC.  All rights
#                         reserved.
# $COPYRIGHT$
#
# Additional copyrights may follow
#
# $HEADER$
#
# This is the US/English help file for Open MPI's OpenFabrics support
# (the openib BTL).
#
[ini file:file not found]
The Open MPI OpenFabrics (openib) BTL component was unable to find or
read an INI file that was requested via the
btl_openib_device_param_files MCA parameter.  Please check this file
and/or modify the btl_openib_evice_param_files MCA parameter:

    %s
#
[ini file:not in a section]
In parsing the OpenFabrics (openib) BTL parameter file, values were
found that were not in a valid INI section.  These values will be
ignored.  Please re-check this file:

    %s

At line %d, near the following text:

    %s
#
[ini file:unexpected token]
In parsing the OpenFabrics (openib) BTL parameter file, unexpected
tokens were found (this may cause significant portions of the INI file
to be ignored).  Please re-check this file:

    %s

At line %d, near the following text:

    %s
#
[ini file:expected equals]
In parsing the OpenFabrics (openib) BTL parameter file, unexpected
tokens were found (this may cause significant portions of the INI file
to be ignored).  An equals sign ("=") was expected but was not found.
Please re-check this file:

    %s

At line %d, near the following text:

    %s
#
[ini file:expected newline]
In parsing the OpenFabrics (openib) BTL parameter file, unexpected
tokens were found (this may cause significant portions of the INI file
to be ignored).  A newline was expected but was not found.  Please
re-check this file:

    %s

At line %d, near the following text:

    %s
#
[ini file:unknown field]
In parsing the OpenFabrics (openib) BTL parameter file, an
unrecognized field name was found.  Please re-check this file:

    %s

At line %d, the field named:

    %s

This field, and any other unrecognized fields, will be skipped.
#
[no device params found]
WARNING: No preset parameters were found for the device that Open MPI
detected:

  Local host:            %s
  Device name:           %s
  Device vendor ID:      0x%04x
  Device vendor part ID: %d

Default device parameters will be used, which may result in lower
performance.  You can edit any of the files specified by the
btl_openib_device_param_files MCA parameter to set values for your
device.

NOTE: You can turn off this warning by setting the MCA parameter
      btl_openib_warn_no_device_params_found to 0.
#
[init-fail-no-mem]
The OpenFabrics (openib) BTL failed to initialize while trying to
allocate some locked memory.  This typically can indicate that the
memlock limits are set too low.  For most HPC installations, the
memlock limits should be set to "unlimited".  The failure occured
here:

  Local host:    %s
  OMPI source:   %s:%d
  Function:      %s()
  Device:        %s
  Memlock limit: %s

You may need to consult with your system administrator to get this
problem fixed.  This FAQ entry on the Open MPI web site may also be
helpful:

    http://www.open-mpi.org/faq/?category=openfabrics#ib-locked-pages
#
[init-fail-create-q]
The OpenFabrics (openib) BTL failed to initialize while trying to
create an internal queue.  This typically indicates a failed
OpenFabrics installation, faulty hardware, or that Open MPI is
attempting to use a feature that is not supported on your hardware
(i.e., is a shared receive queue specified in the
btl_openib_receive_queues MCA parameter with a device that does not
support it?).  The failure occured here:

  Local host:  %s
  OMPI source: %s:%d
  Function:    %s()
  Error:       %s (errno=%d)
  Device:      %s

You may need to consult with your system administrator to get this
problem fixed.
#
[pp rnr retry exceeded]
The OpenFabrics "receiver not ready" retry count on a per-peer
connection between two MPI processes has been exceeded.  In general,
this should not happen because Open MPI uses flow control on per-peer
connections to ensure that receivers are always ready when data is
sent.

This error usually means one of two things:

1. There is something awry within the network fabric itself.
2. A bug in Open MPI has caused flow control to malfunction.

#1 is usually more likely.  You should note the hosts on which this
error has occurred; it has been observed that rebooting or removing a
particular host from the job can sometimes resolve this issue.

Below is some information about the host that raised the error and the
peer to which it was connected:

  Local host:   %s
  Local device: %s
  Peer host:    %s

You may need to consult with your system administrator to get this
problem fixed.
#
[srq rnr retry exceeded]
The OpenFabrics "receiver not ready" retry count on a shared receive
queue or XRC receive queue has been exceeded.  This error can occur if
the mca_btl_openib_ib_rnr_retry is set to a value less than 7 (where 7
the default value and effectively means "infinite retry").  If your
rnr_retry value is 7, there might be something awry within the network
fabric itself.  In this case, you should note the hosts on which this
error has occurred; it has been observed that rebooting or removing a
particular host from the job can sometimes resolve this issue.

Below is some information about the host that raised the error and the
peer to which it was connected:

  Local host:   %s
  Local device: %s
  Peer host:    %s

You may need to consult with your system administrator to get this
problem fixed.
#
[pp retry exceeded]
The InfiniBand retry count between two MPI processes has been
exceeded.  "Retry count" is defined in the InfiniBand spec 1.2
(section 12.7.38):

    The total number of times that the sender wishes the receiver to
    retry timeout, packet sequence, etc. errors before posting a
    completion error.

This error typically means that there is something awry within the
InfiniBand fabric itself.  You should note the hosts on which this
error has occurred; it has been observed that rebooting or removing a
particular host from the job can sometimes resolve this issue.

Two MCA parameters can be used to control Open MPI's behavior with
respect to the retry count:

* btl_openib_ib_retry_count - The number of times the sender will
  attempt to retry (defaulted to 7, the maximum value).
* btl_openib_ib_timeout - The local ACK timeout parameter (defaulted
  to 20).  The actual timeout value used is calculated as:

     4.096 microseconds * (2^btl_openib_ib_timeout)

  See the InfiniBand spec 1.2 (section 12.7.34) for more details.

Below is some information about the host that raised the error and the
peer to which it was connected:

  Local host:   %s
  Local device: %s
  Peer host:    %s

You may need to consult with your system administrator to get this
problem fixed.
#
[no active ports found]
WARNING: There is at least non-excluded one OpenFabrics device found,
but there are no active ports detected (or Open MPI was unable to use
them).  This is most certainly not what you wanted.  Check your
cables, subnet manager configuration, etc.  The openib BTL will be
ignored for this job.

  Local host: %s
#
[error in device init]
WARNING: There was an error initializing an OpenFabrics device.

  Local host:   %s
  Local device: %s
#
[no devices right type]
WARNING: No OpenFabrics devices of the right type were found within
the requested bus distance.  The OpenFabrics BTL will be ignored for
this run.

  Local host:     %s
  Requested type: %s

If the "requested type" is "<any>", this usually means that *no*
OpenFabrics devices were found within the requested bus distance.

Note starting with Open MPI 4.0, only iWarp and RoCE devices are considered
for selection by default.  Set the btl_openib_allow_ib MCA
parameter to "true" to allow use of Infiniband devices.
#
[default subnet prefix]
WARNING: There are more than one active ports on host '%s', but the
default subnet GID prefix was detected on more than one of these
ports.  If these ports are connected to different physical IB
networks, this configuration will fail in Open MPI.  This version of
Open MPI requires that every physically separate IB subnet that is
used between connected MPI processes must have different subnet ID
values.

Please see this FAQ entry for more details:

  http://www.open-mpi.org/faq/?category=openfabrics#ofa-default-subnet-gid

NOTE: You can turn off this warning by setting the MCA parameter
      btl_openib_warn_default_gid_prefix to 0.
#
[ibv_fork requested but not supported]
WARNING: fork() support was requested for the OpenFabrics (openib)
BTL, but it is not supported on the host %s.  Deactivating the
OpenFabrics BTL.
#
[ibv_fork_init fail]
WARNING: fork() support was requested for the OpenFabrics (openib)
BTL, but the library call ibv_fork_init() failed on the host %s.
Deactivating the OpenFabrics BTL.
#
[wrong buffer alignment]
Wrong buffer alignment %d configured on host '%s'. Should be bigger
than zero and power of two. Use default %d instead.
#
[of error event]
The OpenFabrics stack has reported a network error event.  Open MPI
will try to continue, but your job may end up failing.

  Local host:        %s
  MPI process PID:   %d
  Error number:      %d (%s)

This error may indicate connectivity problems within the fabric;
please contact your system administrator.
#
[of unknown event]
The OpenFabrics stack has reported an unknown network error event.
Open MPI will try to continue, but the job may end up failing.

  Local host:        %s
  MPI process PID:   %d
  Error number:      %d

This error may indicate that you are using an OpenFabrics library
version that is not currently supported by Open MPI.  You might try
recompiling Open MPI against your OpenFabrics library installation to
get more information.
#
[specified include and exclude]
ERROR: You have specified more than one of the btl_openib_if_include,
btl_openib_if_exclude, btl_openib_ipaddr_include, or btl_openib_ipaddr_exclude
MCA parameters.  These four parameters are mutually exclusive; you can only
specify one.

For reference, the values that you specified are:

  btl_openib_if_include: %s
  btl_openib_if_exclude: %s
  btl_openib_ipaddr_include: %s
  btl_openib_ipaddr_exclude: %s
#
[nonexistent port]
WARNING: One or more nonexistent OpenFabrics devices/ports were
specified:

  Host:                 %s
  MCA parameter:        mca_btl_if_%sclude
  Nonexistent entities: %s

These entities will be ignored.  You can disable this warning by
setting the btl_openib_warn_nonexistent_if MCA parameter to 0.
#
[invalid mca param value]
WARNING: An invalid MCA parameter value was found for the OpenFabrics
(openib) BTL.

  Problem:    %s
  Resolution: %s
#
[no qps in receive_queues]
WARNING: No queue pairs were defined in the btl_openib_receive_queues
MCA parameter.  At least one queue pair must be defined.  The
OpenFabrics (openib) BTL will therefore be deactivated for this run.

  Local host: %s
#
[invalid qp type in receive_queues]
WARNING: An invalid queue pair type was specified in the
btl_openib_receive_queues MCA parameter.  The OpenFabrics (openib) BTL
will be deactivated for this run.

Valid queue pair types are "P" for per-peer and "S" for shared receive
queue.

  Local host: %s
  btl_openib_receive_queues: %s
  Bad specification: %s
#
[invalid pp qp specification]
WARNING: An invalid per-peer receive queue specification was detected
as part of the btl_openib_receive_queues MCA parameter.  The
OpenFabrics (openib) BTL will therefore be deactivated for this run.

Per-peer receive queues require between 2 and 5 parameters:

  1. Buffer size in bytes (mandatory)
  2. Number of buffers (mandatory)
  3. Low buffer count watermark (optional; defaults to (num_buffers / 2))
  4. Credit window size (optional; defaults to (low_watermark / 2),
     must be > 0)
  5. Number of buffers reserved for credit messages (optional;
     defaults to (num_buffers*2-1)/credit_window)

  Example: P,128,256,128,16
  - 128 byte buffers
  - 256 buffers to receive incoming MPI messages
  - When the number of available buffers reaches 128, re-post 128 more
    buffers to reach a total of 256
  - If the number of available credits reaches 16, send an explicit
    credit message to the sender
  - Defaulting to ((256 * 2) - 1) / 16 = 31; this many buffers are
    reserved for explicit credit messages

  Local host: %s
  Bad queue specification: %s
#
[invalid srq specification]
WARNING: An invalid shared receive queue specification was detected as
part of the btl_openib_receive_queues MCA parameter.  The OpenFabrics
(openib) BTL will therefore be deactivated for this run.

Shared receive queues can take between 2 and 6 parameters:

  1. Buffer size in bytes (mandatory)
  2. Number of buffers (mandatory)
  3. Low buffer count watermark (optional; defaults to (num_buffers / 2))
  4. Maximum number of outstanding sends a sender can have (optional;
     defaults to (low_watermark / 4)
  5. Start value of number of receive buffers that will be pre-posted (optional; defaults to (num_buffers / 4))
  6. Event limit buffer count watermark (optional; defaults to (3/16 of start value of buffers number))

  Example: S,1024,256,128,32,32,8
  - 1024 byte buffers
  - 256 buffers to receive incoming MPI messages
  - When the number of available buffers reaches 128, re-post 128 more
    buffers to reach a total of 256
  - A sender will not send to a peer unless it has less than 32
    outstanding sends to that peer.
  - 32 receive buffers will be preposted.
  - When the number of unused shared receive buffers reaches 8, more
    buffers (32 in this case) will be posted.

  Local host: %s
  Bad queue specification: %s
#
[rd_num must be > rd_low]
WARNING: The number of buffers for a queue pair specified via the
btl_openib_receive_queues MCA parameter must be greater than the low
buffer count watermark.  The OpenFabrics (openib) BTL will therefore
be deactivated for this run.

  Local host: %s
  Bad queue specification: %s
#
[rd_num must be >= rd_init]
WARNING: The number of buffers for a queue pair specified via the
btl_openib_receive_queues MCA parameter (parameter #2) must be
greater or equal to the initial SRQ size (parameter #5).
The OpenFabrics (openib) BTL will therefore be deactivated for this run.

  Local host: %s
  Bad queue specification: %s
#
[srq_limit must be > rd_num]
WARNING: The number of buffers for a queue pair specified via the
btl_openib_receive_queues MCA parameter (parameter #2) must be greater than the limit
buffer count (parameter #6).  The OpenFabrics (openib) BTL will therefore
be deactivated for this run.

  Local host: %s
  Bad queue specification: %s
#
[biggest qp size is too small]
WARNING: The largest queue pair buffer size specified in the
btl_openib_receive_queues MCA parameter is smaller than the maximum
send size (i.e., the btl_openib_max_send_size MCA parameter), meaning
that no queue is large enough to receive the largest possible incoming
message fragment.  The OpenFabrics (openib) BTL will therefore be
deactivated for this run.

  Local host: %s
  Largest buffer size: %d
  Maximum send fragment size: %d
#
[biggest qp size is too big]
WARNING: The largest queue pair buffer size specified in the
btl_openib_receive_queues MCA parameter is larger than the maximum
send size (i.e., the btl_openib_max_send_size MCA parameter).  This
means that memory will be wasted because the largest possible incoming
message fragment will not fill a buffer allocated for incoming
fragments.

  Local host: %s
  Largest buffer size: %d
  Maximum send fragment size: %d
#
[freelist too small]
WARNING: The maximum freelist size that was specified was too small
for the requested receive queue sizes.  The maximum freelist size must
be at least equal to the sum of the largest number of buffers posted
to a single queue plus the corresponding number of reserved/credit
buffers for that queue.  It is suggested that the maximum be quite a
bit larger than this for performance reasons.

  Local host: %s
  Specified freelist size: %d
  Minimum required freelist size: %d
#
[XRC with PP or SRQ]
WARNING: An invalid queue pair type was specified in the
btl_openib_receive_queues MCA parameter.  The OpenFabrics (openib) BTL
will be deactivated for this run.

Note that XRC ("X") queue pairs cannot be used with per-peer ("P") and
SRQ ("S") queue pairs.  This restriction may be removed in future
versions of Open MPI.

  Local host: %s
  btl_openib_receive_queues: %s
#
[XRC with BTLs per LID]
WARNING: An invalid queue pair type was specified in the
btl_openib_receive_queues MCA parameter.  The OpenFabrics (openib) BTL
will be deactivated for this run.

XRC ("X") queue pairs can not be used when (btls_per_lid > 1).  This
restriction may be removed in future versions of Open MPI.

  Local host: %s
  btl_openib_receive_queues: %s
  btls_per_lid: %d
#
[XRC on device without XRC support]
WARNING: You configured the OpenFabrics (openib) BTL to run with %d
XRC queues.  The device %s does not have XRC capabilities; the
OpenFabrics btl will ignore this device.  If no devices are found with
XRC capabilities, the OpenFabrics BTL will be disabled.

  Local host: %s
#
[No XRC support]
WARNING: The Open MPI build was compiled without XRC support, but XRC
("X") queues were specified in the btl_openib_receive_queues MCA
parameter.  The OpenFabrics (openib) BTL will therefore be deactivated
for this run.

  Local host: %s
  btl_openib_receive_queues: %s
#
[non optimal rd_win]
WARNING: rd_win specification is non optimal. For maximum performance it is
advisable to configure rd_win bigger than (rd_num - rd_low), but currently
rd_win = %d and (rd_num - rd_low) = %d.
#
[apm without lmc]
WARNING: You can't enable APM support with LMC bit configured to 0.
APM support will be disabled.
#
[apm with wrong lmc]
Can not provide %d alternative paths with LMC bit configured to %d.
#
[apm not enough ports]
WARNING: For APM over ports ompi require at least 2 active ports and
only single active port was found. Disabling APM over ports
#
[locally conflicting receive_queues]
Open MPI detected two devices on a single server that have different
"receive_queues" parameter values (in the openib BTL).  Open MPI
currently only supports one OpenFabrics receive_queues value in an MPI
job, even if you have different types of OpenFabrics adapters on the
same host.

Device 2 (in the details shown below) will be ignored for the duration
of this MPI job.

You can fix this issue by one or more of the following:

  1. Set the MCA parameter btl_openib_receive_queues to a value that
     is usable by all the OpenFabrics devices that you will use.
  2. Use the btl_openib_if_include or btl_openib_if_exclue MCA
     parameters to select exactly which OpenFabrics devices to use in
     your MPI job.

Finally, note that the "receive_queues" values may have been set by
the Open MPI device default settings file.  You may want to look in
this file and see if your devices are getting receive_queues values
from this file:

    %s/mca-btl-openib-device-params.ini

Here is more detailed information about the recieive_queus value
conflict:

  Local host:     %s
  Device 1:       %s (vendor 0x%x, part ID %d)
  Receive queues: %s
  Device 2:       %s (vendor 0x%x, part ID %d)
  Receive queues: %s
#
[eager RDMA and progress threads]
WARNING: The openib BTL was directed to use "eager RDMA" for short
messages, but the openib BTL was compiled with progress threads
support.  Short eager RDMA is not yet supported with progress threads;
its use has been disabled in this job.

This is a warning only; you job will attempt to continue.
#
[ptmalloc2 with no threads]
WARNING: It appears that ptmalloc2 was compiled into this process via
-lopenmpi-malloc, but there is no thread support.  This combination is
known to cause memory corruption in the openib BTL.  Open MPI is
therefore disabling the use of the openib BTL in this process for this
run.

  Local host: %s
#
[cannot raise btl error]
The OpenFabrics driver in Open MPI tried to raise a fatal error, but
failed.  Hopefully there was an error message before this one that
gave some more detailed information.

  Local host: %s
  Source file: %s
  Source line: %d

Your job is now going to abort, sorry.
#
[no iwarp support]
Open MPI does not support iWARP devices with this version of OFED.
You need to upgrade to a later version of OFED (1.3 or later) for Open
MPI to support iWARP devices.

(This message is being displayed because you told Open MPI to use
iWARP devices via the btl_openib_device_type MCA parameter)
#
[invalid ipaddr_inexclude]
WARNING: An invalid value was given for btl_openib_ipaddr_%s.  This
value will be ignored.

  Local host: %s
  Value:      %s
  Message:    %s
#
[unsupported queues configuration]
The Open MPI receive queue configuration for the OpenFabrics devices
on two nodes are incompatible, meaning that MPI processes on two
specific nodes were unable to communicate with each other.  This
generally happens when you are using OpenFabrics devices from
different vendors on the same network.  You should be able to use the
mca_btl_openib_receive_queues MCA parameter to set a uniform receive
queue configuration for all the devices in the MPI job, and therefore
be able to run successfully.

  Local host:       %s
  Local adapter:    %s (vendor 0x%x, part ID %d)
  Local queues:     %s

  Remote host:      %s
  Remote adapter:   (vendor 0x%x, part ID %d)
  Remote queues:    %s
#
[conflicting transport types]
Open MPI detected two different OpenFabrics transport types in the same Infiniband network.
Such mixed network trasport configuration is not supported by Open MPI.

  Local host:            %s
  Local adapter:         %s (vendor 0x%x, part ID %d)
  Local transport type:  %s

  Remote host:           %s
  Remote Adapter:        (vendor 0x%x, part ID %d)
  Remote transport type: %s
#
[gid index too large]
Open MPI tried to use a GID index that was too large for an
OpenFabrics device (i.e., the GID index does not exist on this
device).

  Local host:              %s
  Local adapter:           %s
  Local port:              %d

  Requested GID index:     %d (specified by the btl_openib_gid_index MCA param)
  Max allowable GID index: %d

Use "ibv_devinfo -v" on the local host to see the GID table of this
device.
[reg mem limit low]
WARNING: It appears that your OpenFabrics subsystem is configured to only
allow registering part of your physical memory.  This can cause MPI jobs to
run with erratic performance, hang, and/or crash.

This may be caused by your OpenFabrics vendor limiting the amount of
physical memory that can be registered.  You should investigate the
relevant Linux kernel module parameters that control how much physical
memory can be registered, and increase them to allow registering all
physical memory on your machine.

See this Open MPI FAQ item for more information on these Linux kernel module
parameters:

    http://www.open-mpi.org/faq/?category=openfabrics#ib-locked-pages

  Local host:              %s
  Registerable memory:     %lu MiB
  Total memory:            %lu MiB

%s
[CUDA_no_gdr_support]
You requested to run with CUDA GPU Direct RDMA support but the Open MPI
library was not built with that support.  The Open MPI library must be
configured with CUDA 6.0 or later.

  Local host:              %s
[driver_no_gdr_support]
You requested to run with CUDA GPU Direct RDMA support but this OFED
installation does not have that support.  Contact Mellanox to figure
out how to get an OFED stack with that support.

  Local host:              %s
[no_fork_with_gdr]
You cannot have fork support and CUDA GPU Direct RDMA support on at the
same time.  Please disable one of them.  Deactivating the openib BTL.

  Local host:              %s
#
[CUDA_gdr_and_nopinned]
You requested to run with CUDA GPU Direct RDMA support but also with
"leave pinned" turned off. This will result in very poor performance
with CUDA GPU Direct RDMA. Either disable GPU Direct RDMA support or
enable "leave pinned" support. Deactivating the openib BTL.

  Local host:              %s
#
[do_not_set_openib_value]
Open MPI has detected that you have attempted to set the btl_openib_cuda_max_send_size
value. This is not supported. Setting back to default value of 0.

  Local host:              %s
[ib port not selected]
By default, for Open MPI 4.0 and later, infiniband ports on a device
are not used by default.  The intent is to use UCX for these devices.
You can override this policy by setting the btl_openib_allow_ib MCA parameter
to true.

  Local host:              %s
  Local adapter:           %s
  Local port:              %d
#