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Viewing Analysis Results

Prerequisites

An overall analysis task has been created and the analysis is complete.

Procedure

  1. In the System Profiler area on the left, click the name of the target analysis task.

    The node list is displayed.

  2. Click the name of the target node to view the analysis results. You can click in the upper right corner to download the overall analysis data.
    • Click the node name. The Summary tab page is displayed by default, as shown in Figure 1. For details about the parameters, see the following tables.
      • The Summary tab page displays the information about the CPU, memory subsystem, storage subsystem, network subsystem, and other configuration items. If the physical machine environment is used, the system component diagram is displayed.
      • The Tuning Suggestions area is displayed only when the system detects metrics to be tuned. You can expand the area to view detailed suggestions and solutions. Tuning suggestions are provided for certain configuration items and marked with . Certain parameters are marked with . You can move the mouse pointer onto the icon to view detailed parameter description and tuning suggestions.
      Figure 1 System Settings
      Table 1 Parameters in the CPU Package area

      Parameter

      Description

      CPU Model

      Model of the CPU.

      Cores

      Number of CPU cores.

      Max. Frequency

      Maximum frequency of the CPU.

      Current Frequency

      Current frequency of the CPU.

      CPU Core

      ID

      CPU manufacturer ID. For example, 0x48 indicates HiSilicon.

      Max. Frequency

      Maximum frequency of the CPU.

      Current Frequency

      Current frequency of the CPU.

      L1I

      Size of the L1 high-speed instruction cache of the CPU.

      L2

      Size of the L2 cache of the CPU.

      L1D

      Size of the L1 high-speed data cache of the CPU.

      L3 cache

      Cache Size

      Size of the L3 cache of the CPU.

      Nodes Sharing L3 Cache

      NUMA nodes that share the L3 cache.

      NUMA Nodes

      Node

      NUMA node name.

      CPU Core ID

      CPU core ID of the NUMA node.

      Total Memory

      Total memory size of the NUMA node.

      Idle Memory

      Idle memory size of the NUMA node.

      NUMA Node Distance

      Node

      NUMA node name.

      NOTE:

      The distance between NUMA nodes represents the costs of a NUMA node to access the memory of another node. A shorter distance means faster memory access from the CPU.

      NUMA Balancing

      NUMA Balancing

      Setting of the NUMA balancing function.

      Table 2 Parameters in the GPU Package area

      Parameter

      Description

      GPU ID

      GPU ID.

      Driver Version

      GPU driver version.

      CUDA Version

      CUDA version.

      Product Name

      Product name.

      Product Brand

      Product brand.

      Display Mode

      Display mode flag.

      Display Active

      Display active flag.

      Persistence Mode

      Persistence mode flag.

      Bus ID

      PCIe bus ID.

      Max PCIe Generation

      Maximum PCIe generation.

      Max PCIe Link Width

      Maximum PCIe bandwidth.

      VBIOS Version

      Onboard BIOS version.

      FB Memory Size (MB)

      Memory capacity of the device.

      BAR1 Memory Size (MB)

      Size of the mapped memory.

      Graphics Clock (MHz)

      Graphics clock frequency.

      Memory Clock (MHz)

      Memory clock frequency.

      Compute Mode

      Compute mode.

      Ecc Mode

      Error check mode.

      Table 3 Parameters in the Memory Subsystem area

      Parameter

      Description

      Total Memory Capacity

      Total memory capacity of the system.

      DIMMs

      Number of DIMMs.

      Empty Slots

      Number of empty memory slots.

      DIMM List

      Slot

      Position of the DIMM slot.

      Capacity

      Capacity of the DIMM installed in the current slot.

      Max. Rate

      Maximum memory speed.

      Configured Rate

      Memory speed configured.

      Type

      Type of the DIMM.

      Table 4 Parameters in the Storage Subsystem area

      Parameter

      Description

      Total Capacity

      Total storage capacity.

      Total Drives

      Total number of drives.

      Drives

      Device Name

      Device name.

      Drive Model

      Model of the drive.

      Drive Capacity

      Capacity of the drive.

      Drive Type

      Type of the drive.

      RAID Controller Cards

      Controller Model

      Model of the RAID controller card.

      Card ID

      ID of the RAID controller card.

      Cache Size

      Size of the cache.

      Table 5 Parameters in the Network Subsystem area

      Parameter

      Description

      NICs

      Number of NICs.

      Network Ports

      Number of network ports.

      NICs

      Latency

      Latency of the NIC.

      NUMA Node

      NUMA node name.

      Kernel Driver

      Driver of the kernel.

      Kernel Module

      Kernel module.

      Subsystem

      Subsystem.

      Network Ports

      Port

      Name of the network port.

      Device (B/D/F)

      Bus/Device/Function (B/F/D) of the device.

      Hardware ID

      Hardware ID.

      txkB/s

      Total data transmitted per second, in KB.

      rxkB/s

      Total data received per second, in KB.

      txpck/s

      Total number of packets transmitted per second.

      rxpck/s

      Total number of packets received per second.

      Max. Transmission Rate

      Maximum transmission speed.

      Current Configured Rate

      Current transmission speed.

      Max. Data Load (byte)

      Maximum data load.

      Details

      Details about the device.

      Table 6 Parameters in the Runtime Environment Information area

      Parameter

      Description

      Basic System Information

      BIOS

      BIOS version information.

      OS Version

      OS version information.

      Kernel Version

      System kernel version information.

      JDK Version

      Java Development Kit (JDK) version information.

      glibc Version

      glibc version information.

      system_dmesg

      System dmesg information. Click View Details for details.

      docker info

      Docker container information. Click View Details for details.

      NOTE:

      This parameter is displayed only when a Docker container is installed on the host machine.

      sysctl

      Information about all system control configuration items. Click View Details for details.

      kernelConfig

      Kernel configuration information. Click View Details for details.

      docker images

      Docker container image information. Click View Details for details.

      NOTE:

      This parameter is displayed only when a Docker container is installed on the host machine.

      BMC Firmware Version

      Firmware version of the BMC.

      SSD driver

      Driver Version

      Driver version.

      SSD Firmware Version

      Firmware version of the SSD.

      Memory Management System

      SMMU

      Status of the SMMU function.

      PT Size (byte)

      Size of the page table.

      THP

      Status of the transparent huge page (THP) function.

      Standard Hugepage (KB)

      Size of the standard huge page.

      Number of Huge Pages

      Number of the standard huge pages. The value 0 indicates that this parameter is not set.

      Swap Partition

      Size of the current swap partition.

      Remaining Cache Time of Dirty Data (centisecond)

      Remaining time of the dirty data in the cache.

      Max. Ratio of Dirty Pages to Total Memory

      Maximum ratio of the dirty page size to the total memory size.

      Max. Ratio of Dirty Page Cache to Total Memory

      Maximum ratio of the dirty page cache size to the total memory size.

      Interval for Waking Up the pdflush Process to Refresh Dirty Data

      Interval for waking up the pdflush process to refresh dirty data, in centiseconds.

      Minimum Free Memory Reserved (KB)

      Minimum size of the idle memory reserved, in KB.

      NIC Firmware Version

      NIC port and NIC firmware version.

      VMs/Dockers

      VM Libvirt Version

      VM libvirt version.

      KVM VM Configuration

      Kernel-based Virtual Machine (KVM) configuration parameters.

      Docker Version

      Docker version.

      Kernel Parameters

      HZ Value

      HZ value.

      NOHZ Timer

      Status of the NOHZ timer.

      cmdline

      Startup script of the kernel.

      Table 7 Parameters in the Storage Resource Configuration area

      Parameter

      Description

      Volumes

      Number of volumes.

      File Systems

      Number of file system partitions.

      RAID Arrays

      Number of RAID arrays.

      RAID level

      Volume Name

      Logical drive name.

      Volume ID

      Logical drive ID.

      RAID Controller Card ID

      ID of the RAID controller card.

      RAID Level

      RAID level.

      Logical Drive Strip Size

      Size of the logical drive strip.

      Current Logical Drive Read Policy

      Current read policy of the logical drive.

      Current Logical Drive Write Policy

      Current write policy of the logical drive.

      Current Logical Drive Cache Policy

      Current cache policy of the local drive.

      CacheCade Identifier

      CacheCade identifier.

      RAID Configuration

      Current RAID configuration.

      Storage Info

      Device Name

      Device name.

      Prefetch Size of Drive Files (KB)

      Prefetch size of the files on drives.

      Storage I/O Scheduling Mechanism

      I/O scheduling mechanism of the storage.

      Drive Request Affinity Setting

      Setting of the drive request affinity. The value 1 indicates that the I/O request is completed by the CPU that initiates the I/O request.

      Drive Request Queue Length

      Average number of read and write requests for a specified drive in a queue within a sampling interval.

      Drive Queue Depth

      Number of I/O operations that can be concurrently processed by the device when the host initiates an I/O request.

      I/O Merging

      I/O merging setting.

      • 0: enables all types of merge attempts.
      • 1: disables complex merge checks, but leaves the simple merge with the previous I/O request valid.
      • 2: disables all types of merge attempts.

      File System Info

      Partition

      Partition name.

      File System Type

      File system type of the partition.

      Mount Point

      Mount point of the current partition.

      Mount Information

      Mount information of the current partition.

      Table 8 Parameters in the Network Port Configuration area

      Parameter

      Description

      Ports

      Number of network ports.

      Interrupt Aggregation

      Network Port Name

      Name of the network port.

      adaptive-rx

      Setting of the dynamic aggregation for a receiving queue.

      adaptive-tx

      Setting of the dynamic aggregation for a transmit queue.

      rx-usecs

      Number of microseconds after at least one packet is received before an interrupt is generated.

      tx-usecs

      Number of microseconds after at least one packet is transmitted before an interrupt is generated.

      rx-frames

      Number of packets transmitted before an interrupt is generated.

      tx-frames

      Number of packets received before an interrupt is generated.

      Offload

      Network Port Name

      Name of the network port.

      rx-checksumming

      Setting of the checksum function for received packets.

      tx-checksumming

      Setting of the checksum function for transmitted packets.

      scatter-gather

      Setting of the scatter/gather function.

      TSO

      Setting of the TCP segmentation offload (TSO) function.

      UFO

      Setting of the UDP fragmentation offload (UFO) function.

      LRO

      Setting of the large receive offload (LRO) function.

      GSO

      Setting of the generic segmentation offload (GSO) function.

      GRO

      Setting of the generic receive offload (GRO) function.

      Queue

      Network Port Name

      Name of the network port.

      Queues

      Number of queues.

      Interrupt NUMA Core Pinning

      Network Port Name

      Name of the network port.

      Interrupt ID

      Interrupt ID.

      Interrupt NUMA Core Pinning Info

      Information about the pinning of interrupts and NUMA cores.

      xps/rps

      Core pinning information of the transmit or receive queue.

      Ring Buffer

      NIC Name

      NIC name.

      TX (Byte)

      Size of the sent cache ring buffer, in bytes.

      RX (Byte)

      Size of the received cache ring buffer, in bytes.

    • Click PCIe Topology to view the PCIe topology analysis result, as shown in Figure 2. Table 9 describes the parameters.
      • You can move the mouse pointer to a device icon in the topology view to view the device details and suggestions. indicates a NUMA node, indicates the interface between the CPU and PCIe topology, indicates the PCI bridge, and indicates the PCIe device.
      • Click + or - to zoom in or zoom out the topology view.
      • You can move the mouse pointer to the icon to view the parameter details.
      • In the interrupt distribution statistics area, you can click to filter the hardware interrupts to be viewed. You can select interrupts from the drop-down list.
      • The icon next to the displayed version information indicates that a new driver version of the NIC is available for upgrade. You can click the icon to perform upgrade operations.
      Figure 2 PCIe topology information

      The icon next to the displayed version information indicates that a new driver version of the NIC is available for upgrade. You can click the icon to perform upgrade operations.

      Table 9 Parameters on the PCIe Topology tab page (NIC device information)

      Parameter

      Description

      PCIe device information

      device_full_name

      Device name.

      DevCap

      Capability of the device.

      DevCtl

      Device scheduling information.

      LnkCap

      Link capability.

      LnkCtl

      Link scheduling information.

      LnkSta

      Link status.

      Device Firmware and Driver Information

      driver

      Driver name.

      version

      Driver version.

      firmware-version

      Driver firmware information.

      driver mount params

      Driver parameter information.

      supported-ports

      Information about supported ports.

      Network Port Status Info

      Network Name

      Name of a network device.

      Link detected

      Link status of the NIC.

      Speed

      NIC speed.

      Duplex

      Work mode of the NIC.

      Auto-negotiation

      Indicates whether auto-negotiation is enabled for the NIC.

      Port Statistics

      rxbyte/s

      Number of bytes received per second.

      txbyte/s

      Number of bytes transmitted per second.

      rxdrop/s

      Number of received data packets that are discarded per second.

      txdrop/s

      Number of transmitted data packets that are discarded per second.

      Receive bytes

      Total number of bytes received by the interface.

      Transmit bytes

      Total number of bytes transmitted by the interface.

      Receive drop

      Total number of discarded data packets received by the driver.

      Transmit drop

      Total number of discarded data packets transmitted by the driver.

      net_core_statistic

      Net core statistics.

      driver_statistic

      Driver layer statistics.

      driver_queue_statistic

      Statistics about queues at the driver layer.

      firmware_statistic

      Microcode-layer statistics.

      MAC_statistic

      Physical layer statistics.

      Interrupt Request Configuration

      irqbalance

      Balance status of an interrupt request.

      RPS

      Indicates whether Receive Packet Steering (RPS) is supported.

      XPS

      Indicates whether Transmit Packet Steering (XPS) is supported.

      RFS

      Indicates whether Receive Flow Steering (RFS) is supported.

      aRFS

      Indicates whether accelerated RFS (aRFS) is supported.

      Interrupt binding core settings

      Number of cores bound to the interrupt.

      Configuration information about the queue size and ring buffer size

      RSS

      Indicates whether Receive Side Scaling (RSS) is supported.

      Queue Configuration

      Queue configuration.

      ring buffer Configuration

      Ring buffer configuration.

      Configuration Information of the NIC Offload Function

      rx-checksumming

      Indicates whether the hardware checksum calculation on the receive end (RX) is supported.

      tx-checksumming

      Indicates whether the hardware checksum calculation on the transmit end (TX) is supported.

      tx-checksum-ipv4

      Indicates whether the IPv4-based TCP/UDP hardware checksum calculation on the TX is supported.

      tx-checksum-ip-generic

      Indicates whether the IP checksum calculation of any protocol or protocol layer combination on the TX is supported.

      tx-checksum-ipv6

      Indicates whether the IPv6-based TCP/UDP hardware checksum calculation on the TX is supported.

      tx-checksum-fcoe-crc

      Indicates whether the hardware checksum calculation of the FCoE CRC32 is supported.

      tx-checksum-sctp

      Indicates whether the SCTP hardware checksum calculation on the TX is supported.

      scatter-gather

      Indicates whether scatter-gather is enabled.

      tx-scatter-gather

      Indicates whether scatter-gather is enabled. ndo_start_xmit can process page-based fragmented skbs(skb_shinfo()->frags).

      tx-scatter-gather-fraglist

      Indicates whether scatter-gather is enabled. ndo_start_xmit can process chained fragmented skbs(skb->next/prev list).

      tcp-segmentation-offload

      Indicates whether TSO is enabled.

      tx-tcp-segmentation

      Indicates whether TCPv4 segmentation is enabled.

      tx-tcp-ecn-segmentation

      Indicates whether hardware is enabled to correctly split data packets with the CWR bit for TCPv4 (tx-tcp-segmentation must be enabled) or TCPv6 (tx-tcp6-segmentation must be enabled).

      tx-tcp-mangleid-segmentation

      Indicates whether the IP ID can be ignored. (The IP ID can increase with the segmentation or remain unchanged, based on the preferred settings of the drive.)

      tx-tcp6-segmentation

      Indicates whether TCPv6 segmentation is enabled.

      generic-segmentation-offload

      Indicates whether segmentation offload is enabled.

      generic-receive-offload

      Indicates whether GRO is enabled.

      large-receive-offload

      Indicates whether LRO is enabled.

      rx-vlan-offload

      Indicates whether VLAN CTAG hardware acceleration on the RX is supported.

      tx-vlan-offload

      Indicates whether VLAN CTAG hardware acceleration on the TX is supported.

      receive-hashing

      Indicates whether hashing offload on the RX is enabled.

      rx-vlan-filter

      Indicates whether VLAN CTAGs filtering on the RX is enabled.

      tx-fcoe-segmentation

      Indicates whether FCoE segmentation is enabled.

      tx-gre-segmentation

      Indicates whether the TX segmentation offload of the GRE packet headers is enabled.

      tx-gre-csum-segmentation

      Indicates whether the TX segmentation offload with checksum in the GRE packet headers is supported.

      tx-ipxip4-segmentation

      Indicates whether TX segmentation offload of the IP4 or IP6 over IP4 packet header is supported.

      tx-ipxip6-segmentation

      Indicates whether TX segmentation offload of the IP4 or IP6 over IP6 packet header is supported.

      tx-udp_tnl-segmentation

      Indicates whether the TX segmentation offload of the UDP tunnel packet headers is supported.

      tx-udp_tnl-csum-segmentation

      Indicates whether the TX segmentation offload with checksum in the UDP tunnel packet headers is supported.

      tx-gso-partial

      Indicates whether partial generic segmentation offload is supported.

      tx-sctp-segmentation

      Indicates whether the function of transmitting segments using SCTP packets is enabled.

      tx-esp-segmentation

      Indicates whether the function of transmitting segments using ESP packets is enabled.

      tx-udp-segmentation

      Indicates whether the function of transmitting segments using UDP packets is enabled.

      tx-vlan-stag-hw-insert

      Indicates whether hardware acceleration for transmitting VLAN S-Tag packets is enabled.

      rx-vlan-stag-hw-parse

      Indicates whether hardware acceleration for receiving VLAN S-Tag packets is enabled.

      rx-vlan-stag-filter

      Indicates whether filtering for receiving VLAN S-Tag packets is enabled.

      l2-fwd-offload

      Indicates whether Layer-2 data packets can be forwarded in hardware.

      hw-tc-offload

      Indicates whether hardware offload for traffic classifier (TC) is enabled.

      esp-hw-offload

      Indicates whether hardware offload for ESP packets on the TX is enabled.

      esp-tx-csum-hw-offload

      Indicates whether ESP packet transmission checksum offload is enabled.

      rx-udp_tunnel-port-offload

      Indicates whether UDP tunnel offload is enabled on the RX.

      tls-hw-tx-offload

      Indicates whether per-packet encryption is enabled for the NIC on the RX.

      tls-hw-rx-offload

      Indicates whether per-packet encryption is enabled for the NIC on the TX.

      rx-gro-hw

      Indicates whether hardware GRO is enabled.

      tls-hw-record

      Indicates whether the NIC driver and firmware TCP processing can be used to replace the kernel network stack processing. This function is unavailable when the Linux network stack is used, such as the firewall function, QoS, and data packet scheduling.

      Other network configuration information

      mtu

      Maximum size of data packets that can pass through the NIC.

      Pause parameters

      Pause frame configuration parameters.

      Sysctl variables

      Settings of sysctl variables.

      LRO coalesce time

      Maximum time used for aggregating received packets.

      Network Port

      hca_id

      Network adapter ID.

      transport

      Protocol information.

      hw_ver

      Hardware version.

      manufacture

      Network adapter manufacturer.

      node_guid

      Unique identifier of a network adapter.

      phys_prot_cnt

      Number of physical network ports.

      port

      Number of ports.

      state

      NIC status.

      active_mtu

      Current maximum transmission unit (MTU).

      sm_lid

      LID of the sub-network manager.

      port_lid

      LID of the port.

      port_lmc

      Local multicast address of the port.

      link_layer

      Current working mode.

      roce_enable

      Indicates whether RoCE is enabled.

      active_speed

      Current speed.

      Ethernet

      Ethernet adapter information.

      bond

      Bond mode information.

      Table 10 Parameters on the PCIe Topology tab page (NVMe device information)

      Parameter

      Description

      PCIe device information

      device_full_name

      Device name.

      DevCap

      Capability of the device.

      DevCtl

      Device scheduling information.

      LnkCap

      Link capability.

      LnkCtl

      Link scheduling information.

      LnkSta

      Link status.

      Smart configuration

      critical warning

      Critical warning information.

      available spare

      Redundant space proportion.

      available spare threshold

      Redundant space alarm proportion.

      percentage used

      Used service life.

      data units read

      Volume of read data.

      data units written

      Volume of written data.

      host read commands

      Total number of host read times.

      host write commands

      Total number of host write times.

      controller busy time

      Busy time statistics of the controller.

      power cycles

      Number of power-on times.

      power on hours

      Power-on duration.

      unsafe shutdowns

      Number of unsafe shutdown times.

      media and data integrity errors

      Number of data errors.

      number of error information log entries

      Number of error logs.

      warning composite temperature time

      Time of minor warning about composite temperature.

      critical composite temperature time

      Time of major warning about composite temperature.

      data status

      Data health status.

      Basic configuration information

      Namespace

      Namespace.

      maximum capacity

      Original maximum capacity.

      current capacity

      Current maximum capacity.

      volatile write cache

      Indicates whether to support the write cache.

      model number

      Device model.

      firmware version

      Firmware version.

      NVMe version

      NVMe version.

      device status

      Device health status.

      Advanced settings

      controller id

      Controller ID.

      PCI slot

      PCI slot number.

      highest temperature

      Highest historical temperature.

      capacitance status

      Supercapacitor health status.

      atomic write

      Atomic write status.

      bad block rate

      Bad block rate.

      total blocks count

      Total number of blocks.

      bad blocks count

      Total number of bad blocks.

      factory bad blocks count

      Number of bad blocks before delivery.

      flash program failed count

      Number of flash programming failures.

      flash erase failed count

      Number of flash erase failures.

      maximum data transfer size

      Maximum size of data that can be transmitted.

      System configuration information

      options nvme use_threaded_interrupts

      Option for NVMe to use thread interrupts.

      dirty_ratio

      Percentage of the dirty data that triggers synchronization to the available memory.

      dirty_background_ratio

      Percentage of the dirty data amount that triggers flushing to the available memory.

      dirty_writeback_centisecs

      Cycle of pdflush dirty data writing.

      dirty_expire_centisecs

      Duration when dirty data resides in the memory.

      nvme1

      Device details.

      Device temperature information

      composite temperature

      Temperature information.

      exceed temperature threshold count

      Number of times that the temperature exceeds the threshold.

      exceed temperature threshold time

      Time when the temperature exceeds the threshold.

      composite highest temperature

      Historical highest temperature of the entire drive.

      composite over temperature threshold count

      Overtemperature count of the entire drive.

      composite over temperature threshold time

      Overtemperature time of the entire drive.

      composite current temperature

      Current temperature of the entire drive.

      composite over temperature threshold temperature

      High temperature threshold of the entire drive.

      composite under temperature threshold temperature

      Low temperature threshold of the entire drive.

      controller highest temperature

      Historical highest temperature of the controller.

      controller over temperature threshold count

      Number of controller overtemperature events.

      controller over temperature threshold time

      Controller overtemperature duration.

      controller1 current temperature

      Current temperature of the controller.

      controller1 over temperature threshold temperature

      High temperature threshold of the controller.

      controller1 under temperature threshold temperature

      Low temperature threshold of the controller.

      Other configuration information

      power states

      Power consumption level of the device.

      Write mode

      Value of the write mode.

      self-test

      Diagnosis test result.

      disk writes per day

      Average amount of data written to the drive per day.

      Device I/O statistics

      Range (µs)

      I/O latency range.

      Read I/O Frequency (times/s)

      Read I/O frequency.

      Write I/O Frequency (times/s)

      Write I/O frequency.

    • Click the System Performance tab page. The performance metrics analysis result is displayed, as shown in Figure 3. For details about the parameters, see the following tables.
      • The sequence data of each performance metric in the entire collection process is displayed. You can drag the time bar on the chart to view the time sequence data in a specified period.
      • The trends of CPU usage, CPU load, CPU level 1 top-down events, memory usage statistics, storage I/O, network I/O, and energy consumption in the collection period are displayed. You can select System, Numa, or Core from the Type drop-down list to switch the CPU usage dimension.
      • You can click next to a system parameter to expand or collapse the corresponding display bar, drag in the display bar to zoom in or zoom out the line chart display range of the corresponding parameter, and click to restore the corresponding line chart to the initial display status.
      • In the CPU level 1 top-down data display area, you can click to filter data.
      Figure 3 System Performance tab page
    • Click the Task Scheduling tab to view the system task scheduling information.
      • The sequence data of system task scheduling information in the entire collection process is displayed. You can drag the time bar on the chart to view the time sequence data in a specified period.
      • You can click next to a system parameter to expand or collapse the corresponding display bar, drag in the display bar to zoom in or zoom out the line chart display range of the corresponding parameter, and click to restore all line charts to the initial display status.
      • For top 10 task statistics and perf statistics, you can click on the right of the table header to filter data.
      • For system task scheduling statistics, you can select Systems, Numa, or Core from the Type drop-down list for data display. For top 10 task statistics, you can select User-mode process or Kernel-mode process from the drop-down list for data display.
      Figure 4 Task scheduling
      Table 11 Perf stat Statistics parameters

      Parameter

      Description

      PMU Statistics

      Name of the PMU event.

      • context-switches: number of context switches, indicating the number of times that the CPU switches from one process to another. Frequent switches may deteriorate the performance.
      • cpu-migrations: number of CPU migrations, that is, the number of times that a process is scheduled to different CPU cores. This may cause cache failures.
      • page-faults: number of page faults, including minor and major page faults, which deteriorate memory access performance.
      • branch-misses: number of branch prediction failures, which affects the pipeline efficiency. A high failure rate may cause performance deterioration.
      • IPC: number of instructions completed in each clock cycle, which reflects the CPU pipeline efficiency. A high IPC value (for example, > 1.0) indicates high instruction-level parallelism. A low IPC value may be caused by cache invalidation, dependency stagnation, or resource contention.

      Average

      Average number of each PMU event in the sampling period.

    • Click the Task Information tab to view the detailed configuration and sampling information about the task on the current node.

      If the task fails to be executed, the failure cause is displayed on the Task Information tab page.

      If part of data fails to be collected but the overall task execution is not affected, you can view the exception message in Exception Information.

      Collection End Cause displays the reason why the data collection of the current task ends, for example, "Task collection times up" or "File size reaches the collection limit."