Play Linux System Distributions Online in a Web Browser

Note: many with 5 minute inactive limit and 30 minutes per session limit.

CodeAnyWhere container (tested 2022.02, w/ root-sudo & git): py, c/c++, java, php, js, ruby, h5, wordpress, .net, rust, go, node.js. (can skip all payment part). terminal speed good. limitted free trial time.

WebMinal (tested 2022.02, NO root/git) (CN network issue for home page, but ok after): Federo CentOS7 (py2.7), right-sided lessons/tutorials (great for new users): shell, MySQL, Python etc.

Windows Management Tools

Windows Task Scheduler （任务计划程序） #

Examples:

$action = New-ScheduledTaskAction -Execute 'pwsh.exe' -Argument '-NonInteractive -NoLogo -NoProfile -File "C:\MyScript.ps1"'
$trigger = New-ScheduledTaskTrigger -Once -At 3am
$settings = New-ScheduledTaskSettingsSet
$task = New-ScheduledTask -Action $Action -Trigger $Trigger -Settings $Settings
Register-ScheduledTask -TaskName 'MySchedule' -InputObject $task -User 'username' -Password 'passhere'
ScheduledTask -TaskName 'MySchedule'

$action = New-ScheduledTaskAction -Execute 'Powershell.exe' `
  -Argument '-NoProfile -WindowStyle Hidden -command "& {get-eventlog -logname Application -After ((get-date).AddDays(-1)) | Export-Csv -Path c:\fso\applog.csv -Force -NoTypeInformation}"'
$trigger = New-ScheduledTaskTrigger -Daily -At 0am
Register-ScheduledTask -Action $action -Trigger $trigger -TaskName "AppLog" -Description "Daily dump of Applog"

$action = New-ScheduledTaskAction -Execute 'C:\FreeFileSync\FreeFileSync.exe' -Argument 'C:\myBackup.ffs_batch'
$trigger = New-ScheduledTaskTrigger -Daily -At 0am
Register-ScheduledTask -Action $action -Trigger $trigger -TaskName "dailyBackup" -Description "Daily green & big files backup"

Note (by default):

System Monitoring Tools (Command-Line)

See also:
Linux server performance measurements monitoring tuning tools
For networking: /networking.
For GPU in deep learning dmml.nu/dl-gpu-monitor

TEMPERATURE #

To monitor CPU temperature lm-sensors (Linux Monitoring sensors):

sudo apt-get install -y lm-sensors && \
sudo sensors-detect && \
sensors
# sudo service kmod start # optional

Extra: using watch to auto-refresh:

watch -n 1 -d sensors # n: nr of seconds to refresh

(gif from nixCraft)

To monitor HDD temperature:

sudo apt-get install hddtemp && \
hddtemp /dev/sd*

Ref: askubuntu

Path to System Design

SNAKE TEMPLATE FOR REQUIREMENT #

Scenario: use-case (if system is big) / interface (if sys is small).
Necessary: constrain/hypothesis.
Application: service/algorithm, e.g. MVC etc.
Kilobit: data.
Evolve: agile spring plan, inc. performance.

Example of recommender sys for personal radio station.
S: recommend a song for a user; like; dislike; skip.
N: 5 Millon users online » about 50k qps (quests per sec) » need 1~2 servers only (cuz we can optimize, e.g. by giving 100 songs per time).
A: alpha, online & offline.
K: size & how to choose, which subset to use: not too big (algorithm performance), not too small (data quality).
E: analyze & go back.