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