[GitHub] [buildstream] abderrahim commented on issue #1541: 1.6.3 performance question

[GitBox <gi...@apache.org>]

abderrahim commented on issue #1541:
URL: https://github.com/apache/buildstream/issues/1541#issuecomment-1021205057


   So I noticed one instance of this: when I have an element `a.bst` which build-depends on `b.bst` then the order is (running with `--fetchers 1`, and with both elements not in the cache).
   ```
   pull a.bst -> fetch a.bst -> pull b.bst -> fetch b.bst -> build b.bst -> build a.bst
   ```
   For an optimal order, pull/ fetch of `b.bst` should happen before fetch of `a.bst`, because than won't be needed until `b.bst` is built.
   
   I suspect that the problem is having multiple `a.bst`-like elements, all having the same build dependency that gets delayed until all of them are pulled/fetched rather than being pulled/fetched as soon as we figure out we need it to build other stuff.


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