How To Fix ICM509 - Number of MPI buffers used

SAP Error Message - Details

• Message type: E = Error

• Message class: ICM - Messages for ICM Monitor

• Message number: 509

• Message text: Number of MPI buffers used

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

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Smart SAP Assistant

• What is the cause and solution for SAP error message ICM509 - Number of MPI buffers used ?

  The SAP error message ICM509, which indicates "Number of MPI buffers used," typically relates to issues with the Internet Communication Manager (ICM) in SAP systems. This error can occur when the number of MPI (Message Passing Interface) buffers exceeds the configured limit, which can lead to performance issues or communication failures.
  Cause:
  
  High Load: The system may be experiencing a high volume of requests, leading to an increased number of MPI buffers being utilized.
  Configuration Limits: The default configuration for MPI buffers may not be sufficient for the current workload.
  Memory Issues: Insufficient memory allocation for the ICM can lead to buffer overflow or exhaustion.
  Long-Running Processes: Long-running transactions or processes may hold onto buffers longer than expected, causing a backlog.
  
  Solution:
  
  
  Increase MPI Buffer Size:
  
  You can increase the number of MPI buffers in the ICM configuration. This can be done by adjusting the parameter icm/HTTP/number_of_mpi_buffers in the SAP profile.
  Example: If the current value is set to 100, you might increase it to 200 or more, depending on your system's needs.
  
  
  
  Monitor System Load:
  
  Use transaction codes like ST03N or ST06 to monitor system performance and identify if there are specific times of high load that correlate with the error.
  
  
  
  Optimize Long-Running Processes:
  
  Review and optimize any long-running transactions or processes that may be holding onto MPI buffers for extended periods.
  
  
  
  Check Memory Allocation:
  
  Ensure that the ICM has sufficient memory allocated. You may need to adjust the icm/HTTP/memory_limit parameter if memory is a constraint.
  
  
  
  Restart ICM:
  
  In some cases, restarting the ICM can help clear out any stuck buffers and reset the state.
  
  
  
  Review Logs:
  
  Check the ICM logs for any additional error messages or warnings that may provide more context about the issue.
  
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to ICM and MPI buffer issues for any specific patches or recommendations.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have implemented.
  Performance Tuning: Consider conducting a performance tuning exercise for your SAP system to ensure that all components are configured optimally for your workload.
  
  By addressing the configuration and monitoring the system's performance, you can mitigate the occurrence of the ICM509 error and improve the overall stability of your SAP environment.