Cache repeated mapper instantiations only within a single instantiation call#61535
Closed
Andarist wants to merge 12 commits intomicrosoft:mainfrom
Closed
Cache repeated mapper instantiations only within a single instantiation call#61535Andarist wants to merge 12 commits intomicrosoft:mainfrom
Andarist wants to merge 12 commits intomicrosoft:mainfrom
Conversation
typescript-bot
added
the
For Uncommitted Bug
Collaborator
|
This PR doesn't have any linked issues. Please open an issue that references this PR. From there we can discuss and prioritise. |
Andarist
force-pushed
the
cache-mapper-instaniations-limited
branch
from
5b50238 to
82666d1
Compare
Member
|
@typescript-bot test it |
Collaborator
Collaborator
|
Hey @jakebailey, the results of running the DT tests are ready. Everything looks the same! |
Collaborator
|
@jakebailey Here are the results of running the user tests with tsc comparing Everything looks good! |
Collaborator
|
@jakebailey Here they are:
tscComparison Report - baseline..pr
System info unknown
Hosts
Scenarios
Developer Information: |
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Collaborator
|
@jakebailey Here are the results of running the top 400 repos with tsc comparing Everything looks good! |
Contributor
Author
|
FWIW, check times for TS 5.8 This PR (#61535) at commit 82666d1: |
3 tasks
JoostK
reviewed
Apr 12, 2025
Comment on lines
+20379
to
+20387
| if (index === -1) { | ||
| pushActiveMapper(mapper); | ||
| } | ||
| const key = type.id + getAliasId(aliasSymbol, aliasTypeArguments); | ||
| const mapperCache = activeTypeMappersCaches[index !== -1 ? index : activeTypeMappersCount - 1]; | ||
| const cached = mapperCache.get(key); | ||
| if (cached) { | ||
| return cached; | ||
| } |
Contributor
There was a problem hiding this comment.
Since key and mapperCache aren't used for initial occurrences of mappers, computing the key can be avoided:
Suggested change
| if (index === -1) { | |
| pushActiveMapper(mapper); | |
| } | |
| const key = type.id + getAliasId(aliasSymbol, aliasTypeArguments); | |
| const mapperCache = activeTypeMappersCaches[index !== -1 ? index : activeTypeMappersCount - 1]; | |
| const cached = mapperCache.get(key); | |
| if (cached) { | |
| return cached; | |
| } | |
| let key: string | undefined; | |
| let mapperCache: Map<string, Type> | undefined; | |
| if (index === -1) { | |
| pushActiveMapper(mapper); | |
| } else { | |
| key = type.id + getAliasId(aliasSymbol, aliasTypeArguments); | |
| mapperCache = activeTypeMappersCaches[index]; | |
| const cached = mapperCache.get(key); | |
| if (cached) { | |
| return cached; | |
| } | |
| } |
Likely also needs some updates below because of the undefineds.
I also wonder if it's worth making the allocation of the Map lazy (and/or to keep it around if it's empty)
Contributor
There was a problem hiding this comment.
Or possibly only push if the type could potentially recurse (depending on the type flags), although I suspect that delaying the allocation of Map should be similar in perf; the push/pop operations themselves should be rather cheap.
Contributor
Author
There was a problem hiding this comment.
Thanks for the suggestions. I'm not sure if this PR is going to make it though - so, for now, I'm refraining from making any changes to it.
Member
|
@typescript-bot pack this |
Collaborator
Collaborator
|
Hey @jakebailey, I've packed this into an installable tgz. You can install it for testing by referencing it in your and then running There is also a playground for this build and an npm module you can use via |
Contributor
Author
|
I moved this to #61505 given the whole conversation is happening there anyway |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to subscribe to this conversation on GitHub.
Already have an account?
Sign in.
4 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
This is an alternative to #61505 , I hope this might have better memory consumption characteristics (at the expense of repeated work, the instantiations diff can be seen here).