Difference between revisions of "Introduction to Linux in HPC/Processes"
Introduction to Linux in HPC/Processes
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([[Media:HPC.NRW_Introduction_to_Linux_in_HPC_07_Processes.pdf | Slides as pdf]]) | ([[Media:HPC.NRW_Introduction_to_Linux_in_HPC_07_Processes.pdf | Slides as pdf]]) | ||
| − | |||
| − | === | + | === Quiz === <!--T:5--> |
| − | 1. Start a process (e.g. sleep 10m) | + | |
| + | {{hidden begin | ||
| + | |title = What does PID stand for? | ||
| + | }} | ||
| + | <quiz display=simple> | ||
| + | { | ||
| + | |type="()"} | ||
| + | - Packet Identifier | ||
| + | || Explanation: Wrong | ||
| + | + Process Identifier | ||
| + | || Explanation: Correct | ||
| + | - Protocol Identifocation | ||
| + | || Explanation: Wrong | ||
| + | </quiz> | ||
| + | {{hidden end}} | ||
| + | |||
| + | {{hidden begin | ||
| + | |title = How are the permissions of a process set? | ||
| + | }} | ||
| + | <quiz display=simple> | ||
| + | { | ||
| + | |type="()"} | ||
| + | + By inheritance of owner's permissions. | ||
| + | || Explanation: Correct. Process can/can’t do what owner can/can’t do! | ||
| + | - Manually by user | ||
| + | || Explanation: Wrong. | ||
| + | + Explicitly at startup by parameters. | ||
| + | || Explanation: Wrong. | ||
| + | </quiz> | ||
| + | {{hidden end}} | ||
| + | |||
| + | === Exercises in Terminal === <!--T:5--> | ||
| + | |||
| + | 1. Start a process (e.g. sleep 10m) and kill it from a second console. | ||
{| role="presentation" class="wikitable mw-collapsible mw-collapsed" | {| role="presentation" class="wikitable mw-collapsible mw-collapsed" | ||
| <strong>Answer:</strong> | | <strong>Answer:</strong> | ||
|- | |- | ||
| | | | ||
| − | + | Start the process: sleep 10m | |
| − | + | Go to a second console. | |
| − | + | Start the process manager: top | |
| − | + | Filter process from your user account: press 'u' and type in your account name. | |
| − | + | Identify the job ('sleep') and note the associated PID. | |
| − | + | Kill it: press 'k' and type in the PID from previous step. | |
|} | |} | ||
| Line 36: | Line 68: | ||
Type bg (bring it to background). | Type bg (bring it to background). | ||
To bring a process to foreground: | To bring a process to foreground: | ||
| − | Type fg (bring it to foreground). | + | Display running "jobs" and identify the job ID: jobs |
| + | Type fg <job-ID> (bring it to foreground). | ||
|} | |} | ||
Revision as of 18:00, 30 November 2020
| Tutorial | |
|---|---|
| Title: | Introduction to Linux in HPC |
| Provider: | HPC.NRW
|
| Contact: | tutorials@hpc.nrw |
| Type: | Multi-part video |
| Topic Area: | HPC Platforms |
| License: | CC-BY-SA |
| Syllabus
| |
| 1. Background and History | |
| 2. The Command Line | |
| 3. Linux Directory Structure | |
| 4. Files | |
| 5. Text display and search | |
| 6. Users and permissions | |
| 7. Processes | |
| 8. The vim text editor | |
| 9. Shell scripting | |
| 10. Environment variables | |
| 11. System configuration | |
| 12. SSH Connections | |
| 13. SSH: Graphics and File Transfer | |
| 14. Various tips | |
Video
Quiz
What does PID stand for?
How are the permissions of a process set?
Exercises in Terminal
1. Start a process (e.g. sleep 10m) and kill it from a second console.
| Answer: |
Start the process: sleep 10m
Go to a second console.
Start the process manager: top
Filter process from your user account: press 'u' and type in your account name.
Identify the job ('sleep') and note the associated PID.
Kill it: press 'k' and type in the PID from previous step.
|
2. Start a process, bring it into background/foreground.
| Hint: |
To bring a process to background:
Press Ctrl-Z (pause the process).
Type bg (bring it to background).
To bring a process to foreground:
Display running "jobs" and identify the job ID: jobs
Type fg <job-ID> (bring it to foreground).
|