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

Edit report at https://bugs.php.net/bug.php?id=77930&edit=1 ID: 77930 Updated by: nikic@php.net Reported by: maggus dot staab at googlemail dot com Summary: stream_copy_to_stream should use mmap more often Status: Open Type: Bug Package: Streams related PHP Version: 7.2.17 Block user comment: N Private report: N New Comment: Is there any script that can be used to benchmark this? Previous Comments: ------------------------------------------------------------------------ [2019-04-23 07:35:38] maggus dot staab at googlemail dot com please find the very detailed bug report on https://github.com/sabre-io/http/pull/119 ------------------------------------------------------------------------ [2019-04-23 07:31:50] maggus dot staab at googlemail dot com 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 this bug report at https://bugs.php.net/bug.php?id=77930&edit=1