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Here we will list fixes to problems that were encountered when building or running Linktest. These fixes may not necessarily be up to date or even work on your system. We hope they will solve your problem or point you in the right direction.
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Here we will list fixes to problems that were encountered when building or running LinkTest. These fixes may not necessarily be up to date or even work on your system. We hope they will solve your problem or point you in the right direction.
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[[_TOC_]]
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# ParastationMPI and `shmget(0, sizeof(shm_com_t), IPC_CREAT | 0777) : No space left on device`
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When using ParastationMPI and testing the MPI communication API using Linktest you may encounter an error-message of the following form:
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When using ParastationMPI and testing the MPI communication API using LinkTest you may encounter an error-message of the following form:
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```
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<PSP:r§TASKID§:shmget(0, sizeof(shm_com_t), IPC_CREAT | 0777) : No space left on device>
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```
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where `§TASKID§` is a 8-digit zero-filled task id, also known as a rank. If other terminating error messages occur afterwards Linktest will terminate, otherwise it will hang.
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where `§TASKID§` is a 8-digit zero-filled task id, also known as a rank. If other terminating error messages occur afterwards LinkTest will terminate, otherwise it will hang.
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This silent error message occurs when so many connections are to be tested that no more shared memory can be allocated on the communication device. This is a hardware limitation, not a software limitation. This commonly occurs when oversubscribing or overcommitting nodes with tasks, for example when using twice as many tasks on a node as it has logical cores.
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