From: Eric Wong <normalperson@...>
Date: 2010-11-12T16:11:46+09:00
Subject: [ruby-core:33150] Re: [Ruby 1.9-Feature#4038] IO#advise

Run Paint Run Run <redmine@ruby-lang.org> wrote:
> +  if (rv = posix_fadvise(fptr->fd, offset, len, advice))

I would release the GVL when making this call, some implementations may
block (even only on certain advice) the running thread for disk ops.
This is the case with POSIX_FADV_WILLNEED under Linux: the entire range
to be read into the page cache before returning from this function,
making it very noticeable on a slow device/filesystem with large files
such as sshfs.

-- 
Eric Wong