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Make the sizes of the members of `enum Node` more uniform #6545

merged 2 commits into from Sep 24, 2018


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stuhood commented Sep 23, 2018


The clippy shard is currently failing with a notice that there is a large variance between the sizes of the members of the Node enum. It refers to

According to mem::size_of, the sizes are currently:

  DigestFile(DigestFile),              // 32
  ExecuteProcess(ExecuteProcess),      // 200
  ReadLink(ReadLink),                  // 24
  Scandir(Scandir),                    // 24
  Select(Select),                      // 232
  Snapshot(Snapshot),                  // 16
  Task(Task),                          // 192


Box the three largest members to appease clippy.


No appreciable difference in performance; happy clippy.

@stuhood stuhood changed the title WIP: Make the sizes of the members of `enum Node` more uniform Make the sizes of the members of `enum Node` more uniform Sep 23, 2018

@stuhood stuhood requested a review from illicitonion Sep 23, 2018

@stuhood stuhood force-pushed the twitter:stuhood/clippy-in-a-box branch from c07ab1a to 19e5ba5 Sep 23, 2018

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illicitonion left a comment

Works for me, thanks :) Probably significantly decreases memory consumption...

If you're just doing this to appease clippy, and would rather disable the lint, I'd be fine with that too, but I suspect the memory savings will actually be non-trivial.

@@ -841,12 +841,12 @@ impl NodeTracer<NodeKey> for Tracer {
#[derive(Clone, Debug, Eq, Hash, PartialEq)]
pub enum NodeKey {

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illicitonion Sep 24, 2018


May be worth adding a comment on the enum about why some things are boxed

@stuhood stuhood merged commit 1924650 into pantsbuild:master Sep 24, 2018

@stuhood stuhood deleted the twitter:stuhood/clippy-in-a-box branch Sep 24, 2018

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