Sets the fixed limit of the spin count for the process engine. The possible values are between 0 and A value of 0 uses an adaptive limit for the spin count, and is the default value.
For oversubscribed cores, use a low value for this setting, such as Specifies the message size in bytes above which the mpiexec command should use the rendezvous protocol for shared memory communication. The range of possible values for this environment variable is to The default value is Specifies the message size in bytes above which the mpiexec command should use the rendezvous protocol for socket communication.
Specifies the message size in bytes above which the mpiexec command should use the rendezvous protocol for Network Direct communication. Specifies whether to use sockets for connections between ranks when the use of Network Direct connections is turned on, but the Network Direct connection fails. A value of 1 indicates that sockets should be used for connections between ranks when the use of Network Direct connections is turned on, but the Network Direct connection fails.
A value of 0 indicates that sockets should not be used for connections between ranks when the use of Network Direct connections is turned on, but the Network Direct connection fails. Specifies the message size in bytes above which the mpiexec command should transfer data directly from the buffer for an application to the buffer for a remote application without an intermediate operating system copy on either side.
This capability is known as zero copy, or zCopy. Specify 0 to use the threshold that is specified by the Network Direct provider. Specify -1 to turn off zCopy transfers.
The default value is 0. Specifies the size in megabytes of the memory registration cache for Network Direct communication.
The default value equals half of the size of physical memory divided by the number of cores. Specifies the size of the buffer space for sending data for socket communication in bytes.
Specifies the number of times to retry a connection between ranks when the connection uses sockets. The default value is 5. Specifies the range of ports that the MPI application should use for socket communication. The default value is 0, Specifies whether the MPI application should exit when the first error occurs. A value of 1 indicates that the MPI application should exit when the first error occurs. A value of 0 indicates that the MPI application should not exit when the first error occurs.
Sets a breakpoint that is relative to MPI initialization for debugging the application. The list is a comma-separated list of ranks or ranges of ranks, such as 1, Specifies whether to add a connectivity table to the standard output of the job that runs the mpiexec command.
A connectivity table shows the mode of communication used between each of the ranks in the job. A value of 1 indicates that the standard output of the job that runs the mpiexec command should include additional information about the mode of communication that is used between each of the ranks.
This additional information includes a list of associations between ranks and nodes and a connectivity map. A value of 0 indicates that the standard output of the job that runs the mpiexec command should not include additional information about the mode of communication that is used between each of the ranks.
The list of associations between ranks and nodes lists the ranks in ascending numeric order and indicates the name of the node that contains the core to which each rank corresponds. The columns in the table correspond to the target rank for the connection, and the column headings indicate the rank number for each target rank. The rows in table correspond to the source rank for the connection, and the row labels indicate the rank number for each source rank.
Each entry in the table contains a character that indicates the mode of communication that is used during the job that ran the mpiexec command between the source rank and the target rank that correspond to the row and column for the entry.
Following are the characters that the connectivity map uses and the modes of communication that they represent. The MPI job did not attempt to establish a connection between the source rank and target rank.
This environment variable is deprecated as of HPC Pack Set up the environment for the compiler,. As a result, a trace file. The workflow above is the most common scenario of tracing with the Intel Trace Collector. For other tracing scenarios, see the Intel Trace Collector documentation. In This Topic. Product and Performance Information 1 Performance varies by use, configuration and other factors.
Undetected Deadlock. To avoid this, use blocking MPI calls in the application, which is also better for performance. Premature Abort. If all processes remain in MPI for a long time due to a long data transfer for instance, then the timeout might be reached.
Because the default timeout is five minutes, this is very unlikely. After writing the trace libVTfs. MPI errors cannot be ignored by installing an error handler. Therefore, VTfs. In This Topic. Product and Performance Information 1 Performance varies by use, configuration and other factors.
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