Learn about wall clock time, and the strace command to get time information.
- [Narrator] A really understandable way…to do timing is just to find out how long something took…in the real world, and if it takes a long time…then you could use the date command,…and then you run it, and when it finishes three days later…you check the date again.…You realize, hey, three days in between.…That's not too common.…Generally you're more interested in time…and one thing you can do with Bash is have…the shell prompt include the time.…So then you can just look at the two shell prompts…and see the difference.…
And we have the time command.…The time command might be at user bin time…or maybe just bin time and this is a prefix command.…So you use the time command to run another command.…We'll use the time command to run the sleep command…and we tell sleep to sleep for two seconds…and after two seconds when that's done…time prints out the elapsed time,…and we have time use in the CPU in user space…and in the kernel which are both zero…'cause the sleep command uses so little CPU…it doesn't even show up.…
It's too small to measure,…
Author
Released
2/15/2018- Timing techniques
- Packages for performance
- Identifying and optimizing CPU bottlenecks
- Finding memory bottlenecks
- Diagnosing disk bottlenecks
Skill Level Advanced
Duration
Views
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Introduction
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Welcome32s
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1. Performance Overview
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Timing techniques14m 16s
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Timing techniques solution3m 21s
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The proc filesystem7m 58s
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Packages for performance6m 8s
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Performance Co-Pilot and Tuna10m 23s
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2. CPU Bottlenecks
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top for CPU usage1m 43s
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sar for CPU2m 59s
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/proc/cpuinfo2m 18s
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Throughput vs. response time4m 17s
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3. Memory Bottlenecks
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What is a memory leak?6m 53s
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CPU caches and page caches12m 43s
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Page sizes and page faults11m 17s
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4. Disk Bottlenecks
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Hard disks and SSD behavior7m 21s
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Filesystem types and performance10m 16s
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Solution: Disk bottlenecks3m 49s
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Conclusion
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Next steps40s
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Video: Timing techniques