Introduction

System Diagnosis is a performance analysis tool for Kunpeng servers. It analyzes system runtime metrics, identifies exceptions, such as memory leak, memory overwriting, and network packet loss, and provides tuning suggestions to help identify memory usage problems in source code and improve program reliability.

**Table 1** Task description
Task Type	Description
Memory usage diagnosis	The tool analyzes the memory usage problems (including unreleased memory and abnormal memory releases) of the application to associate the call stack and source code.
Memory overwriting diagnosis	The tool analyzes memory overwriting problems of the application, provides the memory overwriting type and memory access information, and associates the call stack and source code.
Network I/O Diagnosis	The tool performs pressure tests on the network to obtain the maximum network capability and provide basic reference data for network I/O performance tuning. It diagnoses the network, locates network problems, and resolves network I/O performance problems caused by network configurations and exceptions. The functions include network dialing test, packet loss diagnosis, network packet capture, and system load monitoring. Network I/O diagnosis can collect statistics on network data flows, analyze UDP and TCP data flows in the IPv4 and IPv6 protocol stacks, and collect statistics on the execution of data flows on different processor cores in different phases.
Storage I/O diagnosis	The tool performs storage I/O pressure tests to obtain the maximum storage I/O capabilities, including throughput, IOPS, and latency, and then provides suggestions for tuning the storage I/O performance.

Use Restrictions

**Table 2** Use restrictions
Task Type	Description
Memory usage diagnosis	Currently, memory usage diagnosis is unavailable in a container environment. The environment must support the eBPF configuration.
Memory overwriting diagnosis	The application must be compiled using GCC 4.9 or later.
Network I/O Diagnosis	The OS must have a kernel version ranging from 4.15.0 to 5.4.0, and UOS 20 is not supported.
Storage I/O diagnosis	Do not use logical disks or existing files for pressure tests.

Parent topic: System Diagnosis