How To Fix ICM510 - Max. number of used MPI buffers reached

SAP Error Message - Details

• Message type: E = Error

• Message class: ICM - Messages for ICM Monitor

• Message number: 510

• Message text: Max. number of used MPI buffers reached

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message ICM510 - Max. number of used MPI buffers reached ?

  The SAP error message "ICM510 Max. number of used MPI buffers reached" typically indicates that the Internet Communication Manager (ICM) has reached the maximum number of Message Passing Interface (MPI) buffers that can be used for communication. This can occur in scenarios where there are a high number of concurrent requests or connections, leading to resource exhaustion.
  Cause:
  
  High Load: A sudden spike in traffic or a large number of concurrent users can lead to the exhaustion of available MPI buffers.
  Configuration Limits: The default configuration settings for MPI buffers may be too low for the current workload.
  Memory Issues: Insufficient memory allocation for the ICM can also lead to this error.
  Long-Running Processes: Long-running requests that hold onto MPI buffers for extended periods can contribute to this issue.
  
  Solution:
  
  
  Increase MPI Buffer Limit:
  
  You can increase the maximum number of MPI buffers by adjusting the profile parameters in the SAP system. The relevant parameter is icm/max_connections or icm/HTTP/max_connections.
  To change this, go to transaction RZ10 (Profile Maintenance) and modify the instance profile. After making changes, restart the ICM or the entire SAP instance for the changes to take effect.
  
  
  
  Monitor and Optimize Load:
  
  Use transaction SM50 or SM66 to monitor the active processes and identify any long-running or stuck processes that may be holding onto resources.
  Optimize the application code or configuration to reduce the load on the ICM.
  
  
  
  Check Memory Allocation:
  
  Ensure that the SAP instance has sufficient memory allocated. You may need to adjust the memory settings in the instance profile.
  
  
  
  Review ICM Settings:
  
  Review other ICM-related parameters to ensure they are set appropriately for your environment. Parameters like icm/keep_alive_timeout and icm/timeout can also impact performance.
  
  
  
  Load Balancing:
  
  If applicable, consider implementing load balancing to distribute the load across multiple application servers.
  
  
  
  Check for Network Issues:
  
  Ensure that there are no network issues causing delays in processing requests, which could lead to buffer exhaustion.
  
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may provide additional guidance or patches related to this error.
  SAP Community: Engage with the SAP Community forums for insights from other users who may have encountered similar issues.
  Documentation: Refer to the official SAP documentation for detailed information on ICM configuration and performance tuning.
  
  By following these steps, you should be able to resolve the "ICM510 Max. number of used MPI buffers reached" error and improve the performance of your SAP system.