How To Fix RT858 - Number of SMT Threads

SAP Error Message - Details

• Message type: E = Error

• Message class: RT - Monitoring infrastructure MSG and alert texts

• Message number: 858

• Message text: Number of SMT Threads

What causes this issue?

Denote the number parallel (SMT) threads the processor is currently
supporting.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message RT858 - Number of SMT Threads ?

  The SAP error message RT858, which pertains to the "Number of SMT Threads," typically arises in the context of SAP systems running on specific hardware configurations, particularly those that utilize Simultaneous Multithreading (SMT) technology. This error can occur when the number of SMT threads configured in the system exceeds the limits set by the SAP kernel or the underlying operating system.
  Cause:
  
  Configuration Issues: The number of SMT threads configured in the system may exceed the maximum allowed by the SAP kernel or the operating system.
  Hardware Limitations: The server hardware may not support the number of SMT threads that are being requested or configured.
  Kernel Version: The version of the SAP kernel may have limitations or bugs related to SMT thread handling.
  
  Solution:
  
  Check Configuration: Review the configuration settings for SMT threads in your SAP system. Ensure that the number of threads does not exceed the maximum supported by your hardware and SAP kernel.
  Adjust SMT Settings: If necessary, adjust the SMT settings in the operating system or the SAP instance profile. This may involve reducing the number of SMT threads to align with the hardware capabilities.
  Update SAP Kernel: Ensure that you are using the latest version of the SAP kernel. If you are on an older version, consider upgrading to a newer version that may have improved support for SMT.
  Consult Documentation: Refer to the SAP Notes and documentation related to your specific version of SAP and the hardware you are using. SAP Notes may provide specific guidance or patches related to this error.
  Contact Support: If the issue persists after making adjustments, consider reaching out to SAP support for further assistance. They may provide insights based on your specific environment and configuration.
  
  Related Information:
  
  SAP Notes: Check for relevant SAP Notes that address the RT858 error or SMT thread configuration. SAP Notes often contain troubleshooting steps and best practices.
  System Logs: Review system logs for additional error messages or warnings that may provide more context about the issue.
  Performance Monitoring: Monitor system performance to ensure that changes made to SMT settings do not adversely affect overall system performance.
  
  By following these steps, you should be able to diagnose and resolve the RT858 error related to the number of SMT threads in your SAP environment.