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JoostK fd44d84a33 perf(ngcc): reduce maximum worker count (#38840) 
Recent optimizations to ngcc have significantly reduced the total time
it takes to process `node_modules`, to such extend that sharding across
multiple processes has become less effective. Previously, running
ngcc asynchronously would allow for up to 8 workers to be allocated,
however these workers have to repeat work that could otherwise be shared.
Because ngcc is now able to reuse more shared computations, the overhead
of multiple workers is increased and therefore becomes less effective.
As an additional benefit, having fewer workers requires less memory and
less startup time.

To give an idea, using the following test setup:

```bash
npx @angular/cli new perf-test
cd perf-test
yarn ng add @angular/material
./node_modules/.bin/ngcc --properties es2015 module main \
  --first-only --create-ivy-entry-points
```

We observe the following figures on CI:

|                   | 10.1.1    | PR #38840 |
| ----------------- | --------- | --------- |
| Sync              | 85s       | 25s       |
| Async (8 workers) | 22s       | 16s       |
| Async (4 workers) | -         | 11s       |

In addition to changing the default number of workers, ngcc will now
use the environment variable `NGCC_MAX_WORKERS` that may be configured
to either reduce or increase the number of workers.

PR Close #38840
 		2020-09-15 11:23:09 -07:00
..
src perf(ngcc): reduce maximum worker count (#38840) 2020-09-15 11:23:09 -07:00
test perf(ngcc): reduce maximum worker count (#38840) 2020-09-15 11:23:09 -07:00
BUILD.bazel refactor(ngcc): move `sourcemaps` into `ngtsc` (#37114) 2020-06-22 13:38:47 -07:00
README.md refactor(ivy): move ngcc into a higher level folder (#29092) 2019-03-20 14:45:54 -04:00
index.ts refactor(ngcc): move `logging` code into `ngtsc` (#37114) 2020-06-22 13:38:47 -07:00
main-ivy-ngcc.ts build: update license headers to reference Google LLC (#37205) 2020-05-26 14:26:58 -04:00
main-ngcc.ts build: update license headers to reference Google LLC (#37205) 2020-05-26 14:26:58 -04:00

README.md

Angular Compatibility Compiler (ngcc)

This compiler will convert node_modules compiled with ngc, into node_modules which appear to have been compiled with ngtsc.

This conversion will allow such "legacy" packages to be used by the Ivy rendering engine.

Building

The project is built using Bazel:

yarn bazel build //packages/compiler-cli/ngcc

Unit Testing

The unit tests are built and run using Bazel:

yarn bazel test //packages/compiler-cli/ngcc/test

Integration Testing

There are tests that check the behavior of the overall executable:

yarn bazel test //packages/compiler-cli/ngcc/test:integration