How To Fix RT865 - Physical CPU Idle

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 865

• Message text: Physical CPU Idle

What causes this issue?

Denotes the current number of physical CPU's which are idle in the share
pool to which this LPAR is assigned.

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 RT865 - Physical CPU Idle ?

  The SAP error message RT865 "Physical CPU Idle" typically indicates that the physical CPU is not being utilized effectively, which can lead to performance issues in the SAP system. This message is often related to the configuration of the SAP system, the underlying hardware, or the workload being processed.
  Causes:
  
  Underutilization of Resources: The CPU may be underutilized due to insufficient workload or inefficient processing of tasks.
  Configuration Issues: Incorrect configuration of the SAP system or the underlying operating system can lead to poor CPU utilization.
  Inefficient Queries: Long-running or inefficient queries can cause the CPU to remain idle while waiting for I/O operations to complete.
  System Bottlenecks: Other system resources (like memory or disk I/O) may be bottlenecking the CPU, causing it to remain idle.
  Load Balancing Issues: If the workload is not evenly distributed across available CPUs, some CPUs may remain idle while others are overutilized.
  
  Solutions:
  
  Analyze Workload: Use transaction codes like ST03N (Workload Analysis) to analyze the workload and identify any long-running transactions or inefficient queries.
  Optimize Queries: Review and optimize any SQL queries that may be causing delays. Use tools like the SQL Trace (ST05) to identify problematic queries.
  Check Configuration: Ensure that the SAP system and the operating system are configured correctly for optimal performance. This includes checking parameters related to CPU utilization.
  Review System Resources: Monitor other system resources (memory, disk I/O) to identify any bottlenecks that may be affecting CPU utilization.
  Load Balancing: If applicable, ensure that the workload is evenly distributed across all available CPUs. This may involve adjusting the configuration of the application server or the load balancer.
  Upgrade Hardware: If the system consistently shows low CPU utilization due to insufficient workload, consider upgrading the hardware or consolidating workloads.
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to performance issues and CPU utilization for specific recommendations and patches.
  Performance Monitoring Tools: Utilize SAP's performance monitoring tools (like ST03N, ST06, and ST07) to gain insights into system performance.
  Operating System Monitoring: Use operating system-level monitoring tools to check CPU usage, memory, and I/O statistics.
  SAP Community: Engage with the SAP Community for insights and shared experiences from other users who may have encountered similar issues.
  
  By addressing the underlying causes and implementing the suggested solutions, you can improve CPU utilization and overall system performance in your SAP environment.