Re: [PATCH 29/32] block, aio: Batch completion for bios/kiocbs

[Jeff Moyer]

Kent Overstreet <koverstreet@xxxxxxxxxx> writes:

> On Tue, Jan 08, 2013 at 10:33:18AM -0500, Jeff Moyer wrote:
>> Kent Overstreet <koverstreet@xxxxxxxxxx> writes:
>> 
>> >> Is the rbtree really faster than a basic (l)list and a sort before
>> >> completing them? Would be simpler.
>> >
>> > Well, depends. With one or two kioctxs? The list would definitely be
>> > faster, but I'm loathe to use an O(n^2) algorithm anywhere where the
>> > input size isn't strictly controlled, and I know of applications out
>> > there that use tons of kioctxs.
>> 
>> Out of curiosity, what applications do you know of that use tons of
>> kioctx's?
>
> "tons" is relative I suppose, but before this patch series sharing a
> kioctx between threads was really bad for performance and... you know
> how people can be with threads.

I wasn't questioning the merits of the patch, I was simply curious to
know how aio is being (ab)used in the wild.  So, is this some internal
tool, then, or what?

Thanks!
Jeff
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/