Non blocking file system API

vijay.panghal · 2015-05-09T20:58:13+00:00

On Friday, 8 May 2015 08:51:44 UTC+3, meteor ping wrote:Hello, I want to know the nginx support for below things, from which version, and how can it be conf...

Non blocking file system API

vijay.panghal

Hi,

In OpenResty http request handler, I want to do filesystem operations in non-blocking manner.

But I believe invoking standard library file system api will block the nginx worker process. Is that right?

If so, is anyone aware of effort going on to support non-blocking filesystem api in OpenResty?

Vijay

vijay.panghal

On Saturday, May 9, 2015 at 5:58:12 AM UTC-7, Vijay Panghal wrote:

Hi,

In OpenResty http request handler, I want to do filesystem operations in non-blocking manner.
But I believe invoking standard library file system api will block the nginx worker process. Is that right?
If so, is anyone aware of effort going on to support non-blocking filesystem api in OpenResty?

Vijay

Just to correct my post, when I said non-blocking file IO, I meant asynchronous file IO.

agentzh

Hello!

On Sun, May 10, 2015 at 2:34 AM, Vijay Panghal wrote:
>
> Just to correct my post, when I said non-blocking file IO, I meant
> asynchronous file IO.
>

Hopefully you're not talking about the AIO thing, which has severe
limitations especially on Linux.

The state of the art with blocking file I/O operations is to use OS
thread pooling. AFAIK, nginx 1.9.x already adds an experimental OS
thread pool for file I/O, which we may expose to the Lua land in
ngx_lua. Patches welcome :)

Best regards,
-agentzh