jonkeane commented on a change in pull request #11205:
URL: https://github.com/apache/arrow/pull/11205#discussion_r741417283
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File path: docs/source/developers/cpp/building.rst
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@@ -41,6 +41,9 @@ Building requires:
sufficient. For Windows, at least Visual Studio 2017 is required.
* CMake 3.5 or higher
* On Linux and macOS, either ``make`` or ``ninja`` build utilities
+* At least 1GB of RAM for a minimal build, 4GB for a minimal
+ debug build with tests and 8GB for a full build using
+ :ref:`docker <docker>`.
Review comment:
One thing that we've run into is that enabling the Unity build will
frequently cause more memory to be required.
https://issues.apache.org/jira/browse/ARROW-14555 is an example of that (it
appears the VM had/was using 4GB when it was OOMkilled building unity). Maybe
we should mention here that in ram-constrained environments that's one flag to
turn off (ie. `CMAKE_UNITY_BUILD=OFF`)
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