The HiLog subsystem allows your applications or services to output logs based on the specified type, level, and format string. Such logs help you learn the running status of applications and better debug programs.
The HiLog module allows your applications or services to output logs based on the specified type, level, and format string. Such logs help you learn the running status of applications and better debug programs.
> **NOTE**<br>
> The initial APIs of this module are supported since API version 7. Newly added APIs will be marked with a superscript to indicate their earliest API version.
This module provides the functions of tracing service processes and monitoring the system performance. It provides the data needed for hiTraceMeter to carry out performance analysis.
The Performance Tracing module provides the functions of tracing service processes and monitoring the system performance. It provides the data needed for hiTraceMeter to carry out performance analysis.
This module provides basic log printing capabilities and supports log printing by log level.
The Log module provides basic log printing capabilities and supports log printing by log level.
If you want to use more advanced log printing services, for example, filtering logs by the specified ID, you are advised to use [`@ohos.hilog`](js-apis-hilog.md).
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