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Advanced Topic 44 of 50 DevOps & Tooling

Linux Performance Tools

top, strace and perf for diagnosing systems.

How it works

Diagnosing a slow Linux system starts with identifying the constrained resource. top and htop show CPU and memory per process, vmstat and iostat reveal memory, swap and disk activity, free and df show memory and disk usage, and ss lists sockets. strace traces system calls a process makes, ltrace traces library calls and perf samples CPU stacks, which flame graphs turn into pictures of hot code. eBPF-based tools such as bpftrace give low-overhead insight into the kernel. Brendan Gregg's USE method checks utilization, saturation and errors of each resource in turn.

Where it is used

Engineers use them to find a runaway process, a disk bottleneck, a memory leak or a blocking system call in production.

Common pitfall

Reading one metric alone misleads, heavy tracing slows the very process under test and a high load average is not always CPU. Form a hypothesis, measure one thing at a time and compare against a healthy baseline.

Where it fits in the course

Linux Performance Tools is topic 44 of 50 in DevOps & Tooling, rated Advanced. It follows Reproducible Builds. The next topic is Networking Tools.

Practice and explore

How to study this topic

  1. Read the explanation above and restate the definition in your own words.
  2. Open the interactive lesson and answer its mini quiz.
  3. Read the common pitfall, then write a short example that avoids it.
  4. Check your understanding in the DevOps & Tooling quiz, and revisit the topic if you miss a question.

Frequently asked questions

What is Linux Performance Tools?
top, strace and perf for diagnosing systems. It belongs to DevOps & Tooling and is an advanced-level topic.
Where do people use Linux Performance Tools?
Engineers use them to find a runaway process, a disk bottleneck, a memory leak or a blocking system call in production.
What is the most common mistake with Linux Performance Tools?
Reading one metric alone misleads, heavy tracing slows the very process under test and a high load average is not always CPU.
What should I learn before this topic?
Start with Reproducible Builds, the topic just before it in DevOps & Tooling.
How can I practice it?
Answer the mini quiz in the interactive lesson, then take the DevOps & Tooling quiz.
Is Linux Performance Tools hard to learn?
It is an Advanced topic. Expect to read the explanation more than once and to connect it with earlier topics. Working through a small example by hand helps most.
How long does it take to learn Linux Performance Tools?
Most learners can read the explanation and finish the interactive lesson in under an hour. Fluency comes from applying the idea, so plan a few short practice sessions with the quiz.
Which topics are related to Linux Performance Tools?
Reproducible Builds, Networking Tools, Monorepos are closely connected. The full list is in the related topics section of this page.
What should I study after Linux Performance Tools?
Continue with Networking Tools, the next topic in DevOps & Tooling.

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