Hi Greg,
On Tuesday 19 January 2010 15:52:25 Greg Stark wrote:
> On Mon, Jan 18, 2010 at 4:35 PM, Greg Stark wrote:
> > Looking at this patch for the commitfest I have a few questions.
>
> So I've touched this patch up a bit:
>
> 1) moved the posix_fadvise call to a new fd.c function
> pg_fsync
On Monday 28 December 2009 23:59:43 Andres Freund wrote:
> On Monday 28 December 2009 23:54:51 Andres Freund wrote:
> > On Saturday 12 December 2009 21:38:41 Andres Freund wrote:
> > > On Saturday 12 December 2009 21:36:27 Michael Clemmons wrote:
> > > > If ppl think its worth it I'll create a tick
On Tuesday 29 December 2009 11:48:10 Greg Stark wrote:
> On Tue, Dec 29, 2009 at 2:05 AM, Andres Freund wrote:
> > Reads Completed:2,8KiB Writes Completed: 2362,
> > 29672KiB New:
> > Reads Completed:0,0KiB Writes Completed: 550,
> > 5960KiB
>
>
On Tue, Dec 29, 2009 at 2:05 AM, Andres Freund wrote:
> Reads Completed: 2, 8KiB Writes Completed: 2362,
> 29672KiB
> New:
> Reads Completed: 0, 0KiB Writes Completed: 550,
> 5960KiB
It looks like the new method is only doing 1/6th as much i/o. Do
On Tuesday 29 December 2009 04:04:06 Michael Clemmons wrote:
> Maybe not crash out but in this situation.
> N=0
> while(N>=0):
> CREATE DATABASE new_db_N;
> Since the fsync is the part which takes the memory and time but is
> happening in the background want the fsyncs pile up in the backgroun
Maybe not crash out but in this situation.
N=0
while(N>=0):
CREATE DATABASE new_db_N;
Since the fsync is the part which takes the memory and time but is happening
in the background want the fsyncs pile up in the background faster than can
be run filling up the memory and stack.
This is very lik
On Tuesday 29 December 2009 03:53:12 Michael Clemmons wrote:
> Andres,
> Great job. Looking through the emails and thinking about why this works I
> think this patch should significantly speedup 8.4 on most any file
> system(obviously some more than others) unless the system has significantly
> re
Andres,
Great job. Looking through the emails and thinking about why this works I
think this patch should significantly speedup 8.4 on most any file
system(obviously some more than others) unless the system has significantly
reduced memory or a slow single core. On a Celeron with 256 memory I susp
On Tuesday 29 December 2009 01:46:21 Greg Smith wrote:
> Andres Freund wrote:
> > As I said the real benefit only occurred after adding posix_fadvise(..,
> > FADV_DONTNEED) which is somewhat plausible, because i.e. the directory
> > entries don't need to get scheduled for every file and because the
Andres Freund wrote:
As I said the real benefit only occurred after adding posix_fadvise(..,
FADV_DONTNEED) which is somewhat plausible, because i.e. the directory entries
don't need to get scheduled for every file and because the kernel can reorder a
whole directory nearly sequentially. Withou
On Tuesday 29 December 2009 00:06:28 Tom Lane wrote:
> Andres Freund writes:
> > This speeds up CREATE DATABASE from ~9 seconds to something around 0.8s
> > on my laptop. Still slower than with fsync off (~0.25) but quite a
> > worthy improvement.
>
> I can't help wondering whether that's real o
On Tuesday 29 December 2009 00:06:28 Tom Lane wrote:
> Andres Freund writes:
> > This speeds up CREATE DATABASE from ~9 seconds to something around 0.8s
> > on my laptop. Still slower than with fsync off (~0.25) but quite a
> > worthy improvement.
> I can't help wondering whether that's real or s
Andres Freund writes:
> This speeds up CREATE DATABASE from ~9 seconds to something around 0.8s on my
> laptop. Still slower than with fsync off (~0.25) but quite a worthy
> improvement.
I can't help wondering whether that's real or some kind of
platform-specific artifact. I get numbers more l
On Monday 28 December 2009 23:54:51 Andres Freund wrote:
> On Saturday 12 December 2009 21:38:41 Andres Freund wrote:
> > On Saturday 12 December 2009 21:36:27 Michael Clemmons wrote:
> > > If ppl think its worth it I'll create a ticket
> >
> > Thanks, no need. I will post a patch tomorrow or so.
>
On Saturday 12 December 2009 21:38:41 Andres Freund wrote:
> On Saturday 12 December 2009 21:36:27 Michael Clemmons wrote:
> > If ppl think its worth it I'll create a ticket
> Thanks, no need. I will post a patch tomorrow or so.
Well. It was a long day...
Anyway.
In this patch I delay the fsync do
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