Prevent extensions from blocking parallel pre-compilation #55910
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Previously our precompilation code was causing any dependencies of a
package A to wait on all of A's weakdeps to finish pre-compiling,
even if it can't actually load those weakdeps (or the extension itself)
This would lead to a pre-compile ordering like:
```
A B
\ / \
Ext AB \
| /
C /
\ /
D
```
Here, extension `C` cannot pre-compile in parallel with `Ext {A,B}` and
`B`, because it has to wait for `Ext {A,B}` to finish pre-compiling.
That happens even though `C` has no way to load either of these.
This change updates the pre-compile ordering to be more parallel,
reflecting the true place where `Ext {A,B}` can be loaded:
```
A B
/ \ / \
C Ext AB |
\ | /
\-- D --/
```
which allows `C` to compile in parallel with `B` and `Ext{A,B}`
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KristofferC
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Oct 1, 2024
Backported PRs: - [x] #55849 <!-- Mmap: fix grow! for non file IOs --> - [x] #55863 <!-- Update TaskLocalRNG docstring according to #49110 --> - [x] #54433 <!-- Root globals in toplevel exprs --> - [x] #55828 <!-- Fix some corner cases of `isapprox` with unsigned integers --> - [x] #55890 <!-- Profile: fix order of fields in heapsnapshot & improve formatting --> - [x] #55884 <!-- inference: add missing `TypeVar` handling for `instanceof_tfunc` --> - [x] #55881 <!-- Install terminfo data under /usr/share/julia --> - [x] #55909 <!-- do not intentionally suppress errors in precompile script from being reported or failing the result --> - [x] #55355 <!-- relocation: account for trailing path separator in depot paths --> - [x] #55917 <!-- fix rawbigints OOB issues --> - [x] #55892 <!-- TOML: Avoid type-pirating `Base.TOML.Parser` --> - [x] #55798 <!-- Broadcast binary ops involving strided triangular --> - [x] #55919 <!-- Limit `@inbounds` to indexing in the dual-iterator branch in `copyto_unaliased!` --> Contains multiple commits, manual intervention needed: - [ ] #54009 <!-- allow extensions to trigger from packages in [deps] --> - [ ] #55509 <!-- Fix cong implementation to be properly random and not just cycling. --> - [ ] #55569 <!-- Add a docs section about loading/precomp/ttfx time tuning --> - [ ] #55824 <!-- Replace regex package module checks with actual code checks --> Non-merged PRs with backport label: - [ ] #55932 <!-- REPL: make UndefVarError aware of imported modules --> - [ ] #55910 <!-- Prevent extensions from blocking parallel pre-compilation --> - [ ] #55908 <!-- add logic to prefer loading modules that are already loaded --> - [ ] #55886 <!-- irrationals: restrict assume effects annotations to known types --> - [ ] #55871 <!-- lowering: don't reverse handler order in `(pop-handler-list ...)` --> - [ ] #55870 <!-- fix infinite recursion in `promote_type` for `Irrational` --> - [ ] #55867 <!-- update `hash` doc string: `widen` not required any more --> - [ ] #55851 <!-- [REPL] Fix #55850 by using `safe_realpath` instead of `abspath` in `projname` --> - [ ] #55813 <!-- Check for conflicting `@ccallable` name before JIT registration --> - [ ] #55743 <!-- doc: heap snapshot viewing --> - [ ] #55741 <!-- Change annotations to use a NamedTuple --> - [ ] #55534 <!-- Set stdlib sources as read-only during installation --> - [ ] #55499 <!-- propagate the terminal's `displaysize` to the `IOContext` used by the REPL --> - [ ] #55458 <!-- Allow for generically extracting unannotated string --> - [ ] #55457 <!-- Make AnnotateChar equality consider annotations --> - [ ] #55220 <!-- `isfile_casesensitive` fixes on Windows --> - [ ] #55169 <!-- `propertynames` for SVD respects private argument --> - [ ] #54457 <!-- Make `String(::Memory)` copy --> - [ ] #53957 <!-- tweak how filtering is done for what packages should be precompiled --> - [ ] #51479 <!-- prevent code loading from lookin in the versioned environment when building Julia --> - [ ] #50813 <!-- More doctests for Sockets and capitalization fix --> - [ ] #50157 <!-- improve docs for `@inbounds` and `Base.@propagate_inbounds` -->
This was referenced Oct 7, 2024
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Previously our precompilation code was causing anything with package A as a dependency to wait on all of A's extensions and weakdeps to finish before starting to pre-compile, even if it can't actually load those weakdeps (or the extensions themselves)
This would lead to a pre-compile ordering like:
Here
Ccannot pre-compile in parallel withExt {A,B}andB, because it has to wait forExt {A,B}to finish pre-compiling. That happens even thoughChas no way to load either of these.This change updates the pre-compile ordering to be more parallel, reflecting the true place where
Ext {A,B}can be loaded:which allows
Cto compile in parallel withBandExt{A,B}Please review 55b40ed (that's the only commit w/ important changes)