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Creating a Memory Access Analysis Task

Function

The tool accesses the PMU events of the cache and memory and analyzes the number of storage access times, hit rate, and bandwidth.

Prerequisites

  • No nodes are in the Offline state.
  • The OS is openEuler (kernel version: 4.19 or later) or CentOS 7.6 (kernel version: 4.14.0-115.el7a.0.1/4.14.0-115.2.2.el7a/4.14.0-115.5.1.el7a/4.14.0-115.6.1.el7a/4.14.0-115.7.1.el7a/4.14.0-115.8.2.el7a/4.14.0-115.10.1.el7a), and the SPE environment is configured. For details, see Configuring the SPE Environment.

Procedure

  1. Click next to System Profiler.

    Choose General Analysis from the drop-down list. The page for creating a task is displayed.

  2. Set task parameters by referring to "Task Management" and Table 1.
    Create a memory access statistics analysis task, see Figure 1.
    Figure 1 Creating a memory access statistics analysis task
    Table 1 Parameters for creating a memory access analysis task

    Parameter

    Description

    Task Name

    Name of the task. The name must meet the following requirements:

    1. Contain only letters, digits, and underscores (_).
    2. Contain 1 to 64 characters.

    Select Nodes

    Select the nodes to be analyzed. If there is only one node, this node is selected by default. A maximum of 10 nodes can be selected at a time.

    Analysis Object

    Select System.

    Analysis Type

    Select Memory Access.

    Access Analysis Type

    Select Memory access statistics.

    Sampling Duration (s)

    Sampling duration, in seconds. The default value is 30. The value range is 1 to 300.

    Sampling Interval (ms)

    Sampling interval, in milliseconds. The default value is 1000. You can set this parameter in Advanced Configurations. The options are:

    • 100
    • 1000
    NOTE:

    The Sampling Interval value must be less than or equal to half of the Sampling Duration value.

    Sampling Type

    Type of the analysis to be performed, which can be Cache Access or DDR Access. By default, both of the options are selected. You need to set this parameter in Advanced Configurations.

    Task Execution

    The options are Execute now (default) and On a schedule. You need to set this parameter in Advanced Configurations.

    If On a schedule is selected, you need to set Sampling Mode, Sampling Time, and Sampling Date.

    For Periodical sampling mode, the task runs once a day in the sampling period. You need to set Sampling Time and Sampling Date.

    For One-Time sampling mode, the task takes effect only once. You need to set Sampling Date and Time.

    NOTE:
    • A user can create a maximum of 20 scheduled tasks.
    • You can click in the upper right corner of the page, choose Tool Settings > System Profiler, and click the Scheduled Tasks tab to view, edit, or delete (batch deletion supported) the created scheduled tasks.
    • The Restart button is unavailable for scheduled tasks.
  3. Click OK.

    You can click the icons next to the task name to perform the following operations:

    • : stops an analysis task. After an analysis task is stopped, the collected information will be deleted.
    • : restarts an analysis task. You can modify task parameter settings and restart an analysis task. This button is available when a task is canceled or fails.
    • : deletes an analysis task. After a task is deleted, all data of this task will be deleted. Exercise caution when performing this operation.
    • : performs analysis again. The analysis task is renamed and restarted.
    • : creates a task for comparing analysis results.
    • : modifies the task or report name. The report naming rule is the same as that of a task.
Parent topic: Memory Access Analysis