From: glass.saga@... Date: 2017-09-05T09:06:52+00:00 Subject: [ruby-core:82646] [Ruby trunk Feature#13867] Copy offloading in IO.copy_stream Issue #13867 has been reported by Glass_saga (Masaki Matsushita). ---------------------------------------- Feature #13867: Copy offloading in IO.copy_stream https://bugs.ruby-lang.org/issues/13867 * Author: Glass_saga (Masaki Matsushita) * Status: Open * Priority: Normal * Assignee: * Target version: 2.5 ---------------------------------------- In linux 4.5, the copy offloading feature with copy_file_range(2) was introduced. This patch enables IO.copy_stream to use it. If "offload" keyword argument is specified, IO.copy_stream will try copy offloading. ```ruby IO.copy_stream("src", "dst", offload: true) ``` If copy offloading is not available on the system, "offload" option will be ignored. When "src" and "dst" are not in the same filesystem, copy_file_range(2) must fail with EXDEV. In this case, IO.copy_steram will fallback to another method (sendfile(2) or read/write) silently. It depends on the filesystem what offloading techniques will be used. Copy offloading is optional in IO.copy_stream because some techniques may change the current behavior. ---Files-------------------------------- patch.diff (7.21 KB) -- https://bugs.ruby-lang.org/ Unsubscribe: