5721ea3c21
## Current Behavior
Running Nx in multiple processes at the same time with the daemon
disabled can cripple a system due to excess memory usage when creating
the graph. This is due to plugin workers being started per-parent
process when there is no daemon. This change enables a file lock to
prevent the simultaneous processing, and read from the cache when the
first run completes.
Currently, running `nx show projects` 30 times in parallel looks
something like this:
30 processes exited within 37535ms
## Expected Behavior
30 processes exited within 6435ms
## Test Script
```js
//@ts-check
const { spawn } = require('child_process');
let alive = new Set();
let start = Date.now();
let iterations = 30;
for (let i = 0; i < iterations; i++) {
const cp = spawn('npx nx show projects', [], {
shell: true,
env: {
...process.env,
NX_DAEMON: 'false',
NX_VERBOSE_LOGGING: 'true',
},
});
alive.add(i);
// cp.stdout.on('data', (data) => {
// console.log(`stdout [${i}]: ${data}`);
// });
cp.stderr.on('data', (data) => {
console.error(`stderr [${i}]: ${data}`);
});
cp.on('exit', (code) => {
console.log(`child process ${i} exited with code ${code}`);
alive.delete(i);
});
}
const i = setInterval(() => {
if (alive.size > 0) {
} else {
clearInterval(i);
console.log(
`${iterations} processes exited within ${Date.now() - start}ms`
);
}
}, 1);
```
{{links}}
Nx: Smart Monorepos · Fast CI
Nx is a build system, optimized for monorepos, with plugins for popular frameworks and tools and advanced CI capabilities including caching and distribution.
This package contains a set of utilities for creating Nx plugins.
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