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Download missing dist archives in parallel - #1233
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With `rearchive` disabled, dist archives of type zip or tar are downloaded as is. Each download was awaited before the next one started, so a build creating thousands of archives spent most of its time waiting for single HTTP requests. `ArchiveBuilder::dump()` now starts the downloads of all missing dist archives up front and waits for them together, letting Composer's `HttpDownloader` run them concurrently (12 by default, configurable via `COMPOSER_MAX_PARALLEL_HTTP`). The archive loop then finds the files in place. Failed downloads are ignored at this stage and retried by the loop, so error handling and `--skip-errors` behave as before. The path and download logic of `archive()` is extracted into helper methods shared by both steps. `ArchiveBuilder` uses `react/promise` natively, therefore it is added as a direct dependency.
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With
rearchivedisabled, dist archives of type zip or tar are downloaded as is. Each download was awaited before the next one started, so a build creating thousands of archives spent most of its time waiting for single HTTP requests.ArchiveBuilder::dump()now starts the downloads of all missing dist archives up front and waits for them together, letting Composer'sHttpDownloaderrun them concurrently (12 by default, configurable viaCOMPOSER_MAX_PARALLEL_HTTP). The archive loop then finds the files in place. Failed downloads are ignored at this stage and retried by the loop, so error handling and--skip-errorsbehave as before.The path and download logic of
archive()is extracted into helper methods shared by both steps.ArchiveBuilderusesreact/promisenatively, therefore it is added as a direct dependency.The benchmark was executed on Apple M3 Pro, 36 GB RAM, SSD with APFS, and PHP 8.5.12 installed. Each run downloaded 700 packages.