# Plan to test parallel rustc

**URL:** <https://internals.rust-lang.org/t/plan-to-test-parallel-rustc/11487>\
**Category:** announcements\
**Created:** [December 16, 2019, 9:08pm UTC](https://internals.rust-lang.org/t/plan-to-test-parallel-rustc/11487 "2019-12-16T21:08:56Z")\
**Posts on this page:** 1\
**Showing post:** 18

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**Author:** ![Eh2406](https://sea2.discourse-cdn.com/flex002/user_avatar/internals.rust-lang.org/eh2406/32/4839_2.png) [@Eh2406](https://internals.rust-lang.org/u/Eh2406)\
**Post date:** [December 18, 2019, 3:44pm UTC](https://internals.rust-lang.org/t/plan-to-test-parallel-rustc/11487/18 "2019-12-18T15:44:05Z")

</div>

So I have an 4 core, 8 logical processes, win10 laptop. So here are my numbers for compiling cargo:

```rust
cargo> cargo clean

cargo>cargo +nightly-2019-12-17 check -Ztimings => 1m 47s
cargo>cargo +nightly-2019-12-18 check -Ztimings => 1m 44s 

cargo>cargo +nightly-2019-12-17 build -Ztimings => 1m 48s
cargo>cargo +nightly-2019-12-18 build -Ztimings => 1m 43s

cargo>cargo +nightly-2019-12-17 build --release -Ztimings => 6m 44s
cargo>cargo +nightly-2019-12-18 build --release -Ztimings => 6m 44s

```

[git of timing files](https://gist.github.com/Eh2406/59b8d64965d358cd92f870bf91d9d7dc)

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_[View the full topic](https://internals.rust-lang.org/t/plan-to-test-parallel-rustc/11487)._