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Matthew_S_7
Beginner
415 Views

2019 beta update 1 - tcp fabric unknown

Using a small cluster of Skylake-based systems, as below:

  • 2019 beta update 1 
  • Red Hat 7.6 beta x86_64 (3.10.0-938.el7.x86_64)
  • Systems include Intel Omni-Path HFAs in addition to an onboard gigabit Ethernet nic
  • Systems are using the the RH7.6 inbox Omni-Path support

Attempting to run the included IMB-MPI1 binary over the OPA HFAs specifying psm2 as the transport appears to work correctly. However, trying to run it across the onboard Ethernet network specifying tcp as the transport generates the below message from MPI startup:

MPI startup(): tcp fabric is unknown or has been removed from the product, please use ofi or shm:ofi instead

The job does execute, but over the OPA fabric instead of the Ethernet network. If the OPA HFA is disconnected, the job fails. 

 fi_info -l
psm2:
    version: 1.6
ofi_rxm:
    version: 1.0
sockets:
    version: 2.0

 

 

 

 

 

 

 

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2 Replies
Dmitry_G_Intel
Employee
415 Views

Hi Matthew, Since IMPI 2019, IMPI discontinue support of the following fabrics that can be specified by I_MPI_FABRICS: - TCP - OFA - DAPL - TMI Currently, IMPI 2019 supports only OFI (intra-/internode) and SHM (intranode) fabrics. OFI is a fraemwork that has replacements for all previous fabrics. Those replacements are called OFI providers: - TCP fabric - sockets OFI provider - OFA and DAPL fabrics - verbs OFI provider - TMI - psm2 OFI provider The provider can be specified by FI_PROVIDER='OFI provider name' (e.g. FI_PROVIDER=psm2 to use Intel OPA fabric; FI_PROVIDER=sockets to use Ethernet (or OPA)). OFI discovers all available hardware and maps them on an appropriate OFI provider (e.g. psm2 - Intel OPA, verbs - IB/OPA/iWARP/RoCE, sockets - Ethernet or OPA/IB(over IPoOPA/IPoIB)). User can specify which IP interface (IPoIB or IPoOPA - e.g. ib0; Ethernet - e.g. eth0) should be used for OFI/sockets provider by specifying FI_SOCKETS_IFACE='IP interface name'.

Matthew_S_7
Beginner
415 Views

Dmitry,

 

Thank you for your followup. Are the changes you mention documented in the 2019 release of IMPI? I was looking through the release notes but it wasn't clear to me.

Disregard the above, I found the reference in the Developer's Guide. Thank you again.

Regards,

Matthew Steele

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