Eric Lowe writes:
> On Wed, Jan 25, 2006 at 03:04:55AM +1100, Brendan Gregg wrote:
> |
> | The way a freshly written file (as opposed to a freshly mounted file)
> | changed the number of faults really threw me. Still haven't put my finger
> | on why, but I suspect it's a cache placement poli
On Wed, Jan 25, 2006 at 03:04:55AM +1100, Brendan Gregg wrote:
|
| The way a freshly written file (as opposed to a freshly mounted file)
| changed the number of faults really threw me. Still haven't put my finger
| on why, but I suspect it's a cache placement policy (maybe MPSS - I need
This is p
G'Day Eric,
On Wed, 18 Jan 2006, Eric Lowe wrote:
> Coming into this thread late since I'm returning for vacation...
>
> On Thu, Jan 12, 2006 at 02:55:52AM +1100, Brendan Gregg wrote:
> |
> | I want segvn hit rate. There must be a function in the segvn code
> | somewhere that checks whether a pag
Coming into this thread late since I'm returning for vacation...
On Thu, Jan 12, 2006 at 02:55:52AM +1100, Brendan Gregg wrote:
|
| I want segvn hit rate. There must be a function in the segvn code
| somewhere that checks whether a page is already in the page cache or not,
So in a nutshell, what
Hi Brendan,
I get the same behaviour you are seeing, at least initially.
Over time, the number of segvn_faults returns to ~129.
I don't use /tmp, as this may also skew your output (because
it uses memory). Maybe the writes of pages in the file system
cache are skewing results...
max
(PS. I'll t
G'Day Max,
Thanks for your reply. Things have become a little stranger...
On Thu, 12 Jan 2006 [EMAIL PROTECTED] wrote:
> Hi Greg,
>
> OK. I start the segvn_fault.d script, then in a second window
> a "dd if=/dev/dsk/c0d0s2 of=/dev/null bs=8k"
> and then in a third window do the cp of the 1000 p
Hi Greg,
OK. I start the segvn_fault.d script, then in a second window
a "dd if=/dev/dsk/c0d0s2 of=/dev/null bs=8k"
and then in a third window do the cp of the 1000 page file.
Now I get ~1000 segvn_faults for the cp.
I expected to get a larger count because the dd is
contending with the cp.
So,
G'Day Max,
On Wed, 11 Jan 2006 [EMAIL PROTECTED] wrote:
> Hi Greg,
>
> Upon further reflection (and running your script), I am
> very puzzled you are getting anywhere near 1000 segvn_fault
> calls for the cp.
I get the full 1000 almost every time. I'm on an old x86 box,
# psrinfo -vp
The
Hi Greg,
Upon further reflection (and running your script), I am
very puzzled you are getting anywhere near 1000 segvn_fault
calls for the cp. When I run your script and do a cp on a 1000 page file,
I get about 128 segvn_fault calls for the cp.
This is a much more reasonable number, since cp
is
Hi Greg,
Maybe try segvn_faulta() also?
max
Quoting Brendan Gregg <[EMAIL PROTECTED]>:
G'Day Folks,
I'm revisiting segvn activity analysis to see it's hit rate from the page
cache. A while ago (before I had source code access) I tried writing this
from Kstat. Now with DTrace and source I wan
G'Day Folks,
I'm revisiting segvn activity analysis to see it's hit rate from the page
cache. A while ago (before I had source code access) I tried writing this
from Kstat. Now with DTrace and source I want to nail a solution, and
then go back and rework the Kstat version.
However I've run into a
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