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You can try out this pull request locally by installing Rollup via

npm install rollup/rollup#gh-5848_remove_file_ops_limit

Notice: Ensure you have installed the latest stable Rust toolchain. If you haven't installed it yet, please see https://www.rust-lang.org/tools/install to learn how to download Rustup and install Rust.

or load it into the REPL:
https://rollup-dc32alhjk-rollup-js.vercel.app/repl/?pr=5986

Performance report

• BUILD: 6915ms (-275ms, -3.8%), 830 MB (+9%)
  • initialize: 0ms, 24.6 MB
  • generate module graph: 2548ms (-174ms, -6.4%), 629 MB (+10%)
    • generate ast: 1390ms (+181ms, +15.0%), 623 MB (+11%)
  • sort and bind modules: 393ms (-30ms, -7.2%), 680 MB (+11%)
  • mark included statements: 3981ms, 830 MB (+9%)
    • treeshaking pass 1: 2319ms, 813 MB (+6%)
    • treeshaking pass 2: 469ms, 837 MB (+7%)
    • treeshaking pass 3: 404ms, 823 MB (+8%)
    • treeshaking pass 4: 393ms, 842 MB (+7%)
    • treeshaking pass 5: 391ms, 830 MB (+9%)
• GENERATE: 892ms (+193ms, +27.7%), 927 MB (-8%)
  • initialize render: 0ms, 842 MB (-5%)
  • generate chunks: 145ms (+91ms, +169.6%), 838 MB (-7%)
    • optimize chunks: 0ms, 855 MB (-4%)
  • render chunks: 649ms (+26ms, +4.2%), 901 MB (-7%)
  • transform chunks: 19ms, 927 MB (-8%)
  • generate bundle: 0ms, 927 MB (-8%)

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.78%. Comparing base (5dcce11) to head (1556285).
Report is 2 commits behind head on master.

@@            Coverage Diff             @@
##           master    #5986      +/-   ##
==========================================
- Coverage   98.78%   98.78%   -0.01%     
==========================================
  Files         270      270              
  Lines        8735     8734       -1     
  Branches     1510     1510              
==========================================
- Hits         8629     8628       -1     
  Misses         73       73              
  Partials       33       33              

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This PR has been released as part of rollup@4.44.0. You can test it via npm install rollup.

Hi @lukastaegert,

I’m currently encountering an EMFILE: too many open files error during builds both on Windows and on macOS, which seems related to the file resolver. I noticed this PR removes the limit on max parallel file operations, so I suspect it might be connected.

Here’s an example error log (paths simplified):

error during build:
[commonjs--resolver] Could not load some.js: EMFILE: too many open files
    at async open (node:internal/fs/promises:639:25)
    at async Object.readFile (node:internal/fs/promises:1246:14)
    at async Object.handler (.../node_modules/vite/dist/node/chunks/dep-DBxKXgDP.js:45843:27)
    at async PluginDriver.hookFirstAndGetPlugin (.../node_modules/rollup/dist/es/shared/node-entry.js:22166:28)
    at async .../node_modules/rollup/dist/es/shared/node-entry.js:21170:33
    at async Queue.work (.../node_modules/rollup/dist/es/shared/node-entry.js:22394:32)

I’m still investigating on my side but wanted to share this in case it helps track related issues.

Thanks so much for your work on Rollup! 🙏

Package:
vite: 6.3.5
rollup: 4.44.0

I downgraded Rollup to 4.43.0 and the EMFILE issue is gone. I’ll open a new issue with more details shortly.