Hi Ben,
Would it make sense to use AIO if filesystem supports it? How faster it would be? Did somebody run any benchmarks? I don't know what Windows is (sorry, just trolling), but Linux have a lot of filesystems and it's open. If just one filesystem supports AIO and work with node.js much better, other will follow. If something silently fall back to sync IO, file a bugreport against it, it's as simple as this. Somebody could even write a npm package that does AIO for a specified filesystem. So, anything come up to one question: is it worth it? Any benchmarks? -- // alex 29.11.2012, 06:41, "Ben Noordhuis" <[email protected]>: > On Thu, Nov 29, 2012 at 2:43 AM, Tolga Tekin <[email protected]> wrote: > >> Actually that is not completely true - Both Windows and MacOSX's native file >> APIs support async file operations. >> The limitation might be coming from linux posix api. > > I'm aware of them but neither are really usable. > > Windows AIO only works with files opened in direct I/O mode, meaning > you bypass the disk cache. When a file system doesn't support AIO, it > either raises an error (in which case you have to fall back to > user-space threads) or silently (!) switches to synchronous I/O. > > OS X AIO is implemented with kernel threads but the default settings > are way too low to do anything useful, you have to tweak a bunch of > sysctls first. FreeBSD has similar issues (the implementations are > very similar) and you need to manually load a kernel module first, > otherwise everything fails with ENOSYS. > > Native Linux AIO has the same issues as Windows. glibc's POSIX AIO > implementation doesn't even bother with it, it always uses user-space > threads. > > The only operating system I know of that has a remotely usable > implementation is Solaris and who uses that? > > -- > Job Board: http://jobs.nodejs.org/ > Posting guidelines: > https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines > You received this message because you are subscribed to the Google > Groups "nodejs" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/nodejs?hl=en?hl=en -- Job Board: http://jobs.nodejs.org/ Posting guidelines: https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines You received this message because you are subscribed to the Google Groups "nodejs" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/nodejs?hl=en?hl=en
