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Update date references on parallel-rustc (#1348)

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Yuki Okushi 2022-05-09 22:47:50 +09:00 committed by GitHub
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@ -1,6 +1,6 @@
# Parallel Compilation # Parallel Compilation
As of <!-- date: 2021-09 --> September 2021, The only stage of the compiler As of <!-- date: 2022-05 --> May 2022, The only stage of the compiler
that is already parallel is codegen. The nightly compiler implements query evaluation, that is already parallel is codegen. The nightly compiler implements query evaluation,
but there is still a lot of work to be done. The lack of parallelism at other stages but there is still a lot of work to be done. The lack of parallelism at other stages
also represents an opportunity for improving compiler performance. One can try out the current also represents an opportunity for improving compiler performance. One can try out the current
@ -49,18 +49,18 @@ When a query `foo` is evaluated, the cache table for `foo` is locked.
- If there *is* another query invocation for the same key in progress, we - If there *is* another query invocation for the same key in progress, we
release the lock, and just block the thread until the other invocation has release the lock, and just block the thread until the other invocation has
computed the result we are waiting for. This cannot deadlock because, as computed the result we are waiting for. This cannot deadlock because, as
mentioned before, query invocations form a DAG. Some thread will always make mentioned before, query invocations form a DAG. Some threads will always make
progress. progress.
## Rustdoc ## Rustdoc
As of <!-- date: 2021-09--> September 2021, there are still a number of steps As of <!-- date: 2022-05--> May 2022, there are still a number of steps
to complete before rustdoc rendering can be made parallel. More details on to complete before rustdoc rendering can be made parallel. More details on
this issue can be found [here][parallel-rustdoc]. this issue can be found [here][parallel-rustdoc].
## Current Status ## Current Status
As of <!-- date: 2021-07 --> July 2021, work on explicitly parallelizing the As of <!-- date: 2022-05 --> May 2022, work on explicitly parallelizing the
compiler has stalled. There is a lot of design and correctness work that needs compiler has stalled. There is a lot of design and correctness work that needs
to be done. to be done.
@ -76,7 +76,7 @@ These are the basic ideas in the effort to make `rustc` parallel:
[`rayon`]: https://crates.io/crates/rayon [`rayon`]: https://crates.io/crates/rayon
As of <!-- date: 2021-02 --> February 2021, much of this effort is on hold due As of <!-- date: 2022-05 --> May 2022, much of this effort is on hold due
to lack of manpower. We have a working prototype with promising performance to lack of manpower. We have a working prototype with promising performance
gains in many cases. However, there are two blockers: gains in many cases. However, there are two blockers: