chore(kb): how to measure memory consumption for programs

knowledge base/check performance of programs.md

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+# Check performance of programs
+
+1. [GNU time](#gnu-time)
+1. [Valgrind](#valgrind)
+1. [Further readings](#further-readings)
+   1. [Sources](#sources)
+
+## GNU time
+
+```sh
+# On Mac OS X.
+brew install 'gnu-time'
+gtime -v pulumi preview
+```
+
+## Valgrind
+
+```sh
+valgrind --tool='massif' pulumi preview
+ms_print 'massif.out.12345'
+```
+
+## Further readings
+
+- [Valgrind]
+
+### Sources
+
+- [How can I measure the actual memory usage of an application or process?]
+
+<!--
+  Reference
+  ═╬═Time══
+  -->
+
+<!-- In-article sections -->
+<!-- Knowledge base -->
+[valgrind]: valgrind.md
+
+<!-- Files -->
+<!-- Upstream -->
+<!-- Others -->
+[how can i measure the actual memory usage of an application or process?]: https://stackoverflow.com/questions/131303/how-can-i-measure-the-actual-memory-usage-of-an-application-or-process

knowledge base/valgrind.md

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+# Valgrind
+
+TODO
+
+1. [TL;DR](#tldr)
+1. [Further readings](#further-readings)
+   1. [Sources](#sources)
+
+## TL;DR
+
+<details>
+  <summary>Setup</summary>
+
+```sh
+# Install from source.
+git clone 'https://sourceware.org/git/valgrind.git'
+cd 'valgrind'
+./autogen.sh
+./configure
+make
+make install
+
+# Install using packages.
+sudo zypper install 'valgrind'
+```
+
+</details>
+
+<details>
+  <summary>Usage</summary>
+
+```sh
+# Measure how much heap memory a program uses.
+valgrind --tool='massif' pulumi preview
+
+# Get summary statistics from dump taken with massif.
+ms_print 'massif.out.12345'
+```
+
+</details>
+
+<!-- Uncomment if used
+<details>
+  <summary>Real world use cases</summary>
+
+```sh
+```
+
+</details>
+-->
+
+## Further readings
+
+- [Website]
+- [Main repository]
+
+### Sources
+
+<!--
+  Reference
+  ═╬═Time══
+  -->
+
+<!-- In-article sections -->
+<!-- Knowledge base -->
+<!-- Files -->
+<!-- Upstream -->
+[main repository]: https://sourceware.org/git/valgrind.git
+[website]: https://valgrind.org/
+
+<!-- Others -->