[lkml]   [2010]   [Jun]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: trying to understand READ_META, READ_SYNC, WRITE_SYNC & co
On Sat, Jun 26, 2010 at 07:25:56PM +1000, Nick Piggin wrote:
> Biggest thing is multiple small files operations like on the same
> directory. Best case I measured back when doing AS io scheduler
> versus deadline was about 100x improvement on a uncached kernel
> grep workload when competing with a streaming writeout (the writeout
> probably ended up going somewhat slower naturally, but it is fairer).

As I mentioned below I absolutely see the case for reads. A normal
grep basically is a dependent read kind of workload. For for writes
it should either be O_SYNC-style workloads or batched I/O.

 \ /
  Last update: 2010-06-26 11:31    [W:0.105 / U:0.024 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site