Application Scenarios

You can use functions provided by A-Tune through the CLI client atune-adm. This chapter describes the functions and usage of the A-Tune client.

Overview

  • You can run the atune-adm help/–help/-h command to query commands supported by atune-adm.

  • All example commands are used in single-node mode. For distributed mode, specify an IP address and port number. For example:

    #  atune-adm -a 192.168.3.196 -p 60001 list
    
  • The define, update, undefine, collection, train, and **upgrade **commands do not support remote execution.

  • In the command format, brackets ([]) indicate that the parameter is optional, and angle brackets (<>) indicate that the parameter is mandatory. The actual parameters prevail.

Querying Workload Types

list

Function

Query the supported profiles, and the values of Active.

Format

atune-adm list

Example

# atune-adm list

Support profiles:
+------------------------------------------------+-----------+
| ProfileName                                    | Active    |
+================================================+===========+
| arm-native-android-container-robox             | false     |
+------------------------------------------------+-----------+
| basic-test-suite-euleros-baseline-fio          | false     |
+------------------------------------------------+-----------+
| basic-test-suite-euleros-baseline-lmbench      | false     |
+------------------------------------------------+-----------+
| basic-test-suite-euleros-baseline-netperf      | false     |
+------------------------------------------------+-----------+
| basic-test-suite-euleros-baseline-stream       | false     |
+------------------------------------------------+-----------+
| basic-test-suite-euleros-baseline-unixbench    | false     |
+------------------------------------------------+-----------+
| basic-test-suite-speccpu-speccpu2006           | false     |
+------------------------------------------------+-----------+
| basic-test-suite-specjbb-specjbb2015           | false     |
+------------------------------------------------+-----------+
| big-data-hadoop-hdfs-dfsio-hdd                 | false     |
+------------------------------------------------+-----------+
| big-data-hadoop-hdfs-dfsio-ssd                 | false     |
+------------------------------------------------+-----------+
| big-data-hadoop-spark-bayesian                 | false     |
+------------------------------------------------+-----------+
| big-data-hadoop-spark-kmeans                   | false     |
+------------------------------------------------+-----------+
| big-data-hadoop-spark-sql1                     | false     |
+------------------------------------------------+-----------+
| big-data-hadoop-spark-sql10                    | false     |
+------------------------------------------------+-----------+
| big-data-hadoop-spark-sql2                     | false     |
+------------------------------------------------+-----------+
| big-data-hadoop-spark-sql3                     | false     |
+------------------------------------------------+-----------+
| big-data-hadoop-spark-sql4                     | false     |
+------------------------------------------------+-----------+
| big-data-hadoop-spark-sql5                     | false     |
+------------------------------------------------+-----------+
| big-data-hadoop-spark-sql6                     | false     |
+------------------------------------------------+-----------+
| big-data-hadoop-spark-sql7                     | false     |
+------------------------------------------------+-----------+
| big-data-hadoop-spark-sql8                     | false     |
+------------------------------------------------+-----------+
| big-data-hadoop-spark-sql9                     | false     |
+------------------------------------------------+-----------+
| big-data-hadoop-spark-tersort                  | false     |
+------------------------------------------------+-----------+
| big-data-hadoop-spark-wordcount                | false     |
+------------------------------------------------+-----------+
| cloud-compute-kvm-host                         | false     |
+------------------------------------------------+-----------+
| database-mariadb-2p-tpcc-c3                    | false     |
+------------------------------------------------+-----------+
| database-mariadb-4p-tpcc-c3                    | false     |
+------------------------------------------------+-----------+
| database-mongodb-2p-sysbench                   | false     |
+------------------------------------------------+-----------+
| database-mysql-2p-sysbench-hdd                 | false     |
+------------------------------------------------+-----------+
| database-mysql-2p-sysbench-ssd                 | false     |
+------------------------------------------------+-----------+
| database-postgresql-2p-sysbench-hdd            | false     |
+------------------------------------------------+-----------+
| database-postgresql-2p-sysbench-ssd            | false     |
+------------------------------------------------+-----------+
| default-default                                | false     |
+------------------------------------------------+-----------+
| docker-mariadb-2p-tpcc-c3                      | false     |
+------------------------------------------------+-----------+
| docker-mariadb-4p-tpcc-c3                      | false     |
+------------------------------------------------+-----------+
| hpc-gatk4-human-genome                         | false     |
+------------------------------------------------+-----------+
| in-memory-database-redis-redis-benchmark       | false     |
+------------------------------------------------+-----------+
| middleware-dubbo-dubbo-benchmark               | false     |
+------------------------------------------------+-----------+
| storage-ceph-vdbench-hdd                       | false     |
+------------------------------------------------+-----------+
| storage-ceph-vdbench-ssd                       | false     |
+------------------------------------------------+-----------+
| virtualization-consumer-cloud-olc              | false     |
+------------------------------------------------+-----------+
| virtualization-mariadb-2p-tpcc-c3              | false     |
+------------------------------------------------+-----------+
| virtualization-mariadb-4p-tpcc-c3              | false     |
+------------------------------------------------+-----------+
| web-apache-traffic-server-spirent-pingpo       | false     |
+------------------------------------------------+-----------+
| web-nginx-http-long-connection                 | true      |
+------------------------------------------------+-----------+
| web-nginx-https-short-connection               | false     |
+------------------------------------------------+-----------+

NOTE:
If the value of Active is true, the profile is activated. In the example, the profile of web-nginx-http-long-connection is activated.

Workload Type Analysis and Auto Optimization

analysis

Function

Collect real-time statistics from the system to identify and automatically optimize workload types.

Format

atune-adm analysis [OPTIONS]

Parameter Description

  • OPTIONS

    Parameter

    Description

    --model, -m

    New model generated after user self-training

    --characterization, -c

    Use the default model for application identification and do not perform automatic optimization

Example

  • Use the default model for application identification.

    # atune-adm analysis --characterization
    
  • Use the default model to identify applications and perform automatic tuning.

    # atune-adm analysis
    
  • Use the user-defined training model for recognition.

    # atune-adm analysis --model /usr/libexec/atuned/analysis/models/new-model.m
    

User-defined Model

A-Tune allows users to define and learn new models. To define a new model, perform the following steps:

  1. Run the define command to define a new profile.
  2. Run the collection command to collect the system data corresponding to the application.
  3. Run the train command to train the model.

define

Function

Add a user-defined application scenarios and the corresponding profile tuning items.

Format

atune-adm define <service_type> <application_name> <scenario_name> <profile_path>

Example

Add a profile whose service_type is test_service, application_name is test_app, scenario_name is test_scenario, and tuning item configuration file is example.conf.

# atune-adm define test_service test_app test_scenario ./example.conf

The example.conf file can be written as follows (the following optimization items are optional and are for reference only). You can also run the atune-adm info command to view how the existing profile is written.

 [main]
 # list its parent profile
 [kernel_config]
 # to change the kernel config
 [bios]
 # to change the bios config
 [bootloader.grub2]
 # to change the grub2 config
 [sysfs]
 # to change the /sys/* config
 [systemctl]
 # to change the system service status
 [sysctl]
 # to change the /proc/sys/* config
 [script]
 # the script extention of cpi
 [ulimit]
 # to change the resources limit of user
 [schedule_policy]
 # to change the schedule policy
 [check]
 # check the environment
 [tip]
 # the recommended optimization, which should be performed manunaly

collection

Function

Collect the global resource usage and OS status information during service running, and save the collected information to a CSV output file as the input dataset for model training.

NOTE:

  • This command depends on the sampling tools such as perf, mpstat, vmstat, iostat, and sar.
  • Currently, only the Kunpeng 920 CPU is supported. You can run the dmidecode -t processor command to check the CPU model.

Format

atune-adm collection <OPTIONS>

Parameter Description

  • OPTIONS

    Parameter

    Description

    --filename, -f

    Name of the generated CSV file used for training: name-timestamp.csv

    --output_path, -o

    Path for storing the generated CSV file. The absolute path is required.

    --disk, -b

    Disk used during service running, for example, /dev/sda.

    --network, -n

    Network port used during service running, for example, eth0.

    --app_type, -t

    Mark the application type of the service as a label for training.

    --duration, -d

    Data collection time during service running, in seconds. The default collection time is 1200 seconds.

    --interval, -i

    Interval for collecting data, in seconds. The default interval is 5 seconds.

Example

# atune-adm collection --filename name --interval 5 --duration 1200 --output_path /home/data --disk sda --network eth0 --app_type test_type 

train

Function

Use the collected data to train the model. Collect data of at least two application types during training. Otherwise, an error is reported.

Format

atune-adm train <OPTIONS>

Parameter Description

  • OPTIONS
    Parameter Description
    –data_path, -d Path for storing CSV files required for model training
    –output_file, -o Model generated through training

Example

Use the CSV file in the data directory as the training input. The generated model new-model.m is stored in the model directory.

# atune-adm train --data_path /home/data --output_file /usr/libexec/atuned/analysis/models/new-model.m 

undefine

Function

Delete a user-defined profile.

Format

atune-adm undefine <profile>

Example

Delete the user-defined profile.

# atune-adm undefine test_service-test_app-test_scenario

Querying Profiles

info

Function

View the profile content.

Format

atune-adm info <profile>

Example

View the profile content of web-nginx-http-long-connection.

# atune-adm info web-nginx-http-long-connection

*** web-nginx-http-long-connection:

#
# nginx http long connection A-Tune configuration
#
[main]
include = default-default

[kernel_config]
#TODO CONFIG

[bios]
#TODO CONFIG

[bootloader.grub2]
iommu.passthrough = 1

[sysfs]
#TODO CONFIG

[systemctl]
sysmonitor = stop
irqbalance = stop

[sysctl]
fs.file-max = 6553600
fs.suid_dumpable = 1
fs.aio-max-nr = 1048576
kernel.shmmax = 68719476736
kernel.shmall = 4294967296
kernel.shmmni = 4096
kernel.sem = 250 32000 100 128
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_syncookies = 1
net.ipv4.ip_local_port_range = 1024     65500
net.ipv4.tcp_max_tw_buckets = 5000
net.core.somaxconn = 65535
net.core.netdev_max_backlog = 262144
net.ipv4.tcp_max_orphans = 262144
net.ipv4.tcp_max_syn_backlog = 262144
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_synack_retries = 1
net.ipv4.tcp_syn_retries = 1
net.ipv4.tcp_fin_timeout = 1
net.ipv4.tcp_keepalive_time = 60
net.ipv4.tcp_mem =  362619      483495   725238
net.ipv4.tcp_rmem = 4096         87380   6291456
net.ipv4.tcp_wmem = 4096         16384   4194304
net.core.wmem_default = 8388608
net.core.rmem_default = 8388608
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216

[script]
prefetch = off
ethtool =  -X {network} hfunc toeplitz

[ulimit]
{user}.hard.nofile = 102400
{user}.soft.nofile = 102400

[schedule_policy]
#TODO CONFIG

[check]
#TODO CONFIG

[tip]
SELinux provides extra control and security features to linux kernel. Disabling SELinux will improve the performance but may cause security risks. = kernel
disable the nginx log = application

Updating a Profile

You can update the existing profile as required.

update

Function

Update the original tuning items in the existing profile to the content in the new.conf file.

Format

atune-adm update <profile> <profile_path>

Example

Change the tuning item of the profile named test_service-test_app-test_scenario to new.conf.

# atune-adm update test_service-test_app-test_scenario ./new.conf

Activating a Profile

profile

Function

Manually activate the profile to make it in the active state.

Format

atune-adm profile <profile>

Parameter Description

For details about the profile name, see the query result of the list command.

Example

Activate the profile corresponding to the web-nginx-http-long-connection.

# atune-adm profile web-nginx-http-long-connection

Rolling Back Profiles

rollback

Functions

Roll back the current configuration to the initial configuration of the system.

Format

atune-adm rollback

Example

# atune-adm rollback

Updating Database

upgrade

Function

Update the system database.

Format

atune-adm upgrade <DB_FILE>

Parameter Description

  • DB_FILE

    New database file path.

Example

The database is updated to new_sqlite.db.

# atune-adm upgrade ./new_sqlite.db

Querying System Information

check

Function

Check the CPU, BIOS, OS, and NIC information.

Format

atune-adm check

Example

# atune-adm check
 cpu information:
     cpu:0   version: Kunpeng 920-6426  speed: 2600000000 HZ   cores: 64
     cpu:1   version: Kunpeng 920-6426  speed: 2600000000 HZ   cores: 64
 system information:
     DMIBIOSVersion: 0.59
     OSRelease: 4.19.36-vhulk1906.3.0.h356.eulerosv2r8.aarch64
 network information:
     name: eth0              product: HNS GE/10GE/25GE RDMA Network Controller
     name: eth1              product: HNS GE/10GE/25GE Network Controller
     name: eth2              product: HNS GE/10GE/25GE RDMA Network Controller
     name: eth3              product: HNS GE/10GE/25GE Network Controller
     name: eth4              product: HNS GE/10GE/25GE RDMA Network Controller
     name: eth5              product: HNS GE/10GE/25GE Network Controller
     name: eth6              product: HNS GE/10GE/25GE RDMA Network Controller
     name: eth7              product: HNS GE/10GE/25GE Network Controller
     name: docker0           product:

Automatic Parameter Optimization

A-Tune provides the automatic search capability with the optimal configuration, saving the trouble of manually configuring parameters and performance evaluation. This greatly improves the search efficiency of optimal configurations.

Tuning

Function

Use the specified project file to search the dynamic space for parameters and find the optimal solution under the current environment configuration.

Format

atune-adm tuning [OPTIONS] <PROJECT_YAML>

NOTE:
Before running the command, ensure that the following conditions are met:

  1. The YAML configuration file on the server has been edited and stored in the /etc/atuned/tuning/ directory of the atuned service.
  2. The YAML configuration file of the client has been edited and stored on the atuned client.

Parameter Description

  • OPTIONS

Parameter

Description

--restore, -r

Restores the initial configuration before tuning.

--project, -p

Specifies the project name in the YAML file to be restored.

--restart, -c

Perform tuning based on historical tuning results.

--detail, -d

Print detailed information about the tuning process.

NOTE:
If this parameter is used, the -p parameter must be followed by a specific project name and the YAML file of the project must be specified.

  • PROJECT_YAML: YAML configuration file of the client.

Configuration Description

Table 1 YAML file on the server

Name

Description

Type

Value Range

project

Project name.

Character string

-

startworkload

Script for starting the service to be optimized.

Character string

-

stopworkload

Script for stopping the service to be optimized.

Character string

-

maxiterations

Maximum number of optimization iterations, which is used to limit the number of iterations on the client. Generally, the more optimization iterations, the better the optimization effect, but the longer the time required. Set this parameter based on the site requirements.

Integer

>10

object

Parameters to be optimized and related information.

For details about the object configuration items, see Table 2.

-

-

Table 2 Description of object configuration items

Name

Description

Type

Value Range

name

Parameter to be optimized.

Character string

-

desc

Description of parameters to be optimized.

Character string

-

get

Script for querying parameter values.

-

-

set

Script for setting parameter values.

-

-

needrestart

Specifies whether to restart the service for the parameter to take effect.

Enumeration

true or false

type

Parameter type. Currently, the discrete and continuous types are supported.

Enumeration

discrete or continuous

dtype

This parameter is available only when type is set to discrete. Currently, int, float and string are supported.

Enumeration

int, float, string

scope

Parameter setting range. This parameter is valid only when type is set to discrete and dtype is set to int or float, or type is set to continuous.

Integer/Float

The value is user-defined and must be within the valid range of this parameter.

step

Parameter value step, which is used when dtype is set to int or float.

Integer/Float

This value is user-defined.

items

Enumerated value of which the parameter value is not within the scope. This is used when dtype is set to int or float.

Integer/Float

The value is user-defined and must be within the valid range of this parameter.

options

Enumerated value range of the parameter value, which is used when dtype is set to string.

Character string

The value is user-defined and must be within the valid range of this parameter.

Table 3 Description of configuration items of a YAML file on the client

Name

Description

Type

Value Range

project

Project name, which must be the same as that in the configuration file on the server.

Character string

-

engine

Tuning algorithm.

Character string

"random", "forest", "gbrt", "bayes", "extraTrees"

iterations

Number of optimization iterations.

Integer

≥ 10

random_starts

Number of random iterations.

Integer

< iterations

feature_filter_engine

Parameter search algorithm, which is used to select important parameters. This parameter is optional.

Character string

"lhs"

feature_filter_cycle

Parameter search cycles, which is used to select important parameters. This parameter is used together with feature_filter_engine.

Integer

-

feature_filter_iters

Number of iterations for each cycle of parameter search, which is used to select important parameters. This parameter is used together with feature_filter_engine.

Integer

-

split_count

Number of evenly selected parameters in the value range of tuning parameters, which is used to select important parameters. This parameter is used together with feature_filter_engine.

Integer

-

benchmark

Performance test script.

-

-

evaluations

Performance test evaluation index.

For details about the evaluations configuration items, see Table 4.

-

-

Table 4 Description of evaluations configuration item

Name

Description

Type

Value Range

name

Evaluation index name.

Character string

-

get

Script for obtaining performance evaluation results.

-

-

type

Specifies a positive or negative type of the evaluation result. The value positive indicates that the performance value is minimized, and the value negative indicates that the performance value is maximized.

Enumeration

positive or negative

weight

Weight of the index. The value ranges from 0 to 100.

Integer

0-100

threshold

Minimum performance requirement of the index.

Integer

User-defined

Example

The following is an example of the YAML file configuration on a server:

project: "compress"
maxiterations: 500
startworkload: ""
stopworkload: ""
object :
  -
    name : "compressLevel"
    info :
        desc : "The compresslevel parameter is an integer from 1 to 9 controlling the level of compression"
        get : "cat /root/A-Tune/examples/tuning/compress/compress.py | grep 'compressLevel=' | awk -F '=' '{print $2}'"
        set : "sed -i 's/compressLevel=\\s*[0-9]*/compressLevel=$value/g' /root/A-Tune/examples/tuning/compress/compress.py"
        needrestart : "false"
        type : "continuous"
        scope :
          - 1
          - 9
        dtype : "int"
  -
    name : "compressMethod"
    info :
        desc : "The compressMethod parameter is a string controlling the compression method"
        get : "cat /root/A-Tune/examples/tuning/compress/compress.py | grep 'compressMethod=' | awk -F '=' '{print $2}' | sed 's/\"//g'"
        set : "sed -i 's/compressMethod=\\s*[0-9,a-z,\"]*/compressMethod=\"$value\"/g' /root/A-Tune/examples/tuning/compress/compress.py"
        needrestart : "false"
        type : "discrete"
        options :
          - "bz2"
          - "zlib"
          - "gzip"
        dtype : "string"

  

The following is an example of the YAML file configuration on a client:

project: "compress"
engine : "gbrt"
iterations : 20
random_starts : 10

benchmark : "python3 /root/A-Tune/examples/tuning/compress/compress.py"
evaluations :
  -
    name: "time"
    info:
        get: "echo '$out' | grep 'time' | awk '{print $3}'"
        type: "positive"
        weight: 20
  -
    name: "compress_ratio"
    info:
        get: "echo '$out' | grep 'compress_ratio' | awk '{print $3}'"
        type: "negative"
        weight: 80

  

Example

  • Perform tuning.

    # atune-adm tuning --project compress --detail compress_client.yaml
    
  • Restore the initial configuration before tuning. The compress is the project name in the YAML file.

    # atune-adm tuning --restore --project compress
    
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