Profile Data File Slicing

For a parsed timeline data file in .json format, the system identifies the duration for opening it on the Google Chrome browser (chrome://tracing) and slices it into a proper number of slice files, so that you can quickly open it. The slicing operation automatically starts when the profile data is exported.

You can use the msprof_slice.json file to configure data file slicing attributes. The content and fields of msprof_slice.json are as follows.

{
  "slice_switch": "off",
  "slice_file_size(MB)": 0,
  "strategy": 0
}

The msprof_slice.json configuration file is stored in the following directory:

${INSTALL_DIR}/tools/profiler/profiler_tool/analysis/msconfig. Replace ${INSTALL_DIR} with the actual CANN component directory. If the Ascend-CANN-Toolkit package is installed as the root user, the CANN component directory is /usr/local/Ascend/ascend-toolkit/latest.

**Table 1** Parameters
Parameter	Description
slice_switch	Slicing switch. Possible values are: on: Enable slicing. off (default): Disable slicing. The system limits a sliced file to 20 GB. Files larger than this size will fail to export when slicing is enabled. Slicing cannot be triggered for files smaller than 200 MB even slicing is enabled. Data slicing is disabled by default. Enable it on by setting the parameter to on in the msprof_slice.json file. Any other value will revert to the default setting. By default, data slicing is performed when the duration of opening a timeline data file on the Google Chrome browser exceeds the upper limit. The size of a sliced file is controlled by slice_file_size, and the number of sliced files is controlled by strategy. The name of a sliced file is in the format of _{slice_n}_{timestamp}.json, where slice_n indicates the slice sequence number. For details about other fields, see General Description.
slice_file_size(MB)	Maximum size of a slice file. The unit is MB. The value is a positive integer greater than or equal to 200. By default, the size of a slice file is not limited. If this parameter is set to a positive integer greater than or equal to 200, the size of each slice file cannot exceed the value. If this parameter is set to other values, the size of each slice file is not limited, and the number of slice files is limited based on the value of strategy.
strategy	Slicing policy. Possible values are: 0 (default): slices a file on the condition that the number of slicing times is the minimum and the opening duration is acceptable. 1: slices a file on the condition that the opening duration is shortened to the fast opening standard (with more slicing times). The duration required for opening a file is related to the computer performance. Therefore, the accurate duration cannot be provided. The following are references: Upper limit: ≥ 30s Acceptable duration: [10,30), in seconds Fast opening: (0,10), in seconds The actual duration depends on the device in use.

Parent topic: Appendixes