Bug #77930 [NEW]: stream_copy_to_stream should use mmap more often

From: maggus dot staab at googlemail dot com Operating system: PHP version: 7.2.17 Package: Streams related Bug Type: Bug Bug description:stream_copy_to_stream should use mmap more often Description: ------------ we got a bug report in our http client library https://github.com/sabre-io/http/pull/119 which suggests to change our call to stream_copy_to_stream() to stream in chunks with a size of 4MiB because its nearly 2x faster . the reason is that when you only copy in 4MiB chunks php internally uses mmap. wouldn't it make sense that stream_copy_to_stream() internally would do the chunking to speedup this use-case instead (on php-src level)? -- Edit bug report at https://bugs.php.net/bug.php?id=77930&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=77930&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=77930&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=77930&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=77930&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=77930&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=77930&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=77930&r=needscript Try newer version: https://bugs.php.net/fix.php?id=77930&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=77930&r=support Expected behavior: https://bugs.php.net/fix.php?id=77930&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=77930&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=77930&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=77930&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=77930&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=77930&r=dst IIS Stability: https://bugs.php.net/fix.php?id=77930&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=77930&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=77930&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=77930&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=77930&r=mysqlcfg