MA35D1 Cyclictest of RT-tests
Answer.
- cyclictest is a tool used in Linux systems to test real-time performance and response time. It reads the counter through a loop and tests the number of loops that can be executed within a certain period of time. This reflects the system's real-time responsiveness without interference from other tasks.
Different types of applications running may affect the ACT (Achieved Cycle Time) value of cyclictest:- CPU-intensive tasks: Such as video encoding/decoding, scanning conversion, and other compute-intensive workloads. These tasks occupying the CPU for extended periods will reduce the CPU time slice obtained by cyclictest, resulting in an increase in the ACT value.
- Disk I/O tasks: Such as large data transfers, logging, and other applications involving frequent disk reads and writes. Disk I/O operations preempt CPU time, increase system load, and affect cyclictest ACT.
- Network I/O tasks: Such as video conferencing, file uploading/downloading, and other applications requiring extensive network communication. Interrupt requests generated by network transmission also reduce real-time performance.
- High-priority processes: If there are one or more real-time tasks with priorities higher than cyclictest's residing in the system, it will also affect the ACT value.
- Resource-intensive services: Services like system log collection, ECC monitoring programs running for extended periods may also interfere with real-time testing.
- Graphic interface applications: Large software with GUIs such as web browsers that require frequent interface rendering will increase system load.
- The recommendation is to run cyclictest and threads on CPU1, while other tasks run on CPU0.
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