History

George Kalpakas e36e6c85ef perf(ngcc): process tasks in parallel in async mode (#32427 )

`ngcc` supports both synchronous and asynchronous execution. The default
mode when using `ngcc` programmatically (which is how `@angular/cli` is
using it) is synchronous. When running `ngcc` from the command line
(i.e. via the `ivy-ngcc` script), it runs in async mode.

Previously, the work would be executed in the same way in both modes.

This commit improves the performance of `ngcc` in async mode by
processing tasks in parallel on multiple processes. It uses the Node.js
built-in [`cluster` module](https://nodejs.org/api/cluster.html) to
launch a cluster of Node.js processes and take advantage of multi-core
systems.

Preliminary comparisons indicate a 1.8x to 2.6x speed improvement when
processing the angular.io app (apparently depending on the OS, number of
available cores, system load, etc.). Further investigation is needed to
better understand these numbers and identify potential areas of
improvement.

Inspired by/Based on @alxhub's prototype: alxhub/angular@cb631bdb1
Original design doc: https://hackmd.io/uYG9CJrFQZ-6FtKqpnYJAA?view

Jira issue: [FW-1460](https://angular-team.atlassian.net/browse/FW-1460)

PR Close #32427

2019-09-09 15:55:13 -04:00

src

perf(ngcc): process tasks in parallel in async mode (#32427 )

2019-09-09 15:55:13 -04:00

test

perf(ngcc): process tasks in parallel in async mode (#32427 )

2019-09-09 15:55:13 -04:00

BUILD.bazel

feat(ivy): ngcc - support ngcc "migrations" (#31544 )

2019-07-23 21:11:40 -07:00

index.ts

refactor(ngcc): add support for asynchronous execution (#32427 )

2019-09-09 15:55:13 -04:00

main-ngcc.ts

refactor(ngcc): add support for asynchronous execution (#32427 )

2019-09-09 15:55:13 -04:00

README.md

refactor(ivy): move ngcc into a higher level folder (#29092 )

2019-03-20 14:45:54 -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