Hi,
I open the file, then call mmap() on the whole file and get pointer,
then I work with this pointer. I expect that page should be only once
touched to get it into the memory (disk cache?), but this doesn't work!
I wrote the test (attached) and ran it for the 1G file generated from
/dev/r
On Tue, Apr 03, 2012 at 11:02:53PM +0400, Andrey Zonov wrote:
> Hi,
>
> I open the file, then call mmap() on the whole file and get pointer,
> then I work with this pointer. I expect that page should be only once
> touched to get it into the memory (disk cache?), but this doesn't work!
>
> I w
On 04.04.2012 11:17, Konstantin Belousov wrote:
Calling madvise(MADV_RANDOM) fixes the issue, because the code to
deactivate/cache the pages is turned off. On the other hand, it also
turns of read-ahead for faulting, and the first loop becomes eternally
long.
Now it takes 5 times longer. Anyw
I forgot to attach my test program.
On 04.04.2012 13:36, Andrey Zonov wrote:
On 04.04.2012 11:17, Konstantin Belousov wrote:
Calling madvise(MADV_RANDOM) fixes the issue, because the code to
deactivate/cache the pages is turned off. On the other hand, it also
turns of read-ahead for faulting,
On 04/04/2012 02:17, Konstantin Belousov wrote:
On Tue, Apr 03, 2012 at 11:02:53PM +0400, Andrey Zonov wrote:
Hi,
I open the file, then call mmap() on the whole file and get pointer,
then I work with this pointer. I expect that page should be only once
touched to get it into the memory (disk c
On 04/04/2012 04:36, Andrey Zonov wrote:
On 04.04.2012 11:17, Konstantin Belousov wrote:
Calling madvise(MADV_RANDOM) fixes the issue, because the code to
deactivate/cache the pages is turned off. On the other hand, it also
turns of read-ahead for faulting, and the first loop becomes eternally
On Thu, Apr 05, 2012 at 10:54:31AM -0500, Alan Cox wrote:
> On 04/04/2012 02:17, Konstantin Belousov wrote:
> >On Tue, Apr 03, 2012 at 11:02:53PM +0400, Andrey Zonov wrote:
> >>Hi,
> >>
> >>I open the file, then call mmap() on the whole file and get pointer,
> >>then I work with this pointer. I ex
On 04/05/2012 12:31, Konstantin Belousov wrote:
On Thu, Apr 05, 2012 at 10:54:31AM -0500, Alan Cox wrote:
On 04/04/2012 02:17, Konstantin Belousov wrote:
On Tue, Apr 03, 2012 at 11:02:53PM +0400, Andrey Zonov wrote:
Hi,
I open the file, then call mmap() on the whole file and get pointer,
then
On 05.04.2012 19:54, Alan Cox wrote:
On 04/04/2012 02:17, Konstantin Belousov wrote:
On Tue, Apr 03, 2012 at 11:02:53PM +0400, Andrey Zonov wrote:
[snip]
This is what I expect. But why this doesn't work without reading file
manually?
Issue seems to be in some change of the behaviour of the re
On Thu, Apr 05, 2012 at 11:33:46PM +0400, Andrey Zonov wrote:
> On 05.04.2012 19:54, Alan Cox wrote:
> >On 04/04/2012 02:17, Konstantin Belousov wrote:
> >>On Tue, Apr 03, 2012 at 11:02:53PM +0400, Andrey Zonov wrote:
> [snip]
> >>>This is what I expect. But why this doesn't work without reading fi
On 05.04.2012 23:41, Konstantin Belousov wrote:
On Thu, Apr 05, 2012 at 11:33:46PM +0400, Andrey Zonov wrote:
On 05.04.2012 19:54, Alan Cox wrote:
On 04/04/2012 02:17, Konstantin Belousov wrote:
On Tue, Apr 03, 2012 at 11:02:53PM +0400, Andrey Zonov wrote:
[snip]
This is what I expect. But w
On 05.04.2012 23:54, Andrey Zonov wrote:
On 05.04.2012 23:41, Konstantin Belousov wrote:
You do use UFS, right ?
Yes.
I've run test on ZFS.
Mem: 2645M Active, 363M Inact, 2042M Wired, 1406M Buf, 42G Free
$ ./mmap /mnt/random
Mem: 3669M Active, 363M Inact, 3067M Wired, 1406M Buf, 40G Free
On Thu, Apr 05, 2012 at 11:54:53PM +0400, Andrey Zonov wrote:
> On 05.04.2012 23:41, Konstantin Belousov wrote:
> >On Thu, Apr 05, 2012 at 11:33:46PM +0400, Andrey Zonov wrote:
> >>On 05.04.2012 19:54, Alan Cox wrote:
> >>>On 04/04/2012 02:17, Konstantin Belousov wrote:
> On Tue, Apr 03, 2012 a
On Thu, Apr 05, 2012 at 01:25:49PM -0500, Alan Cox wrote:
> On 04/05/2012 12:31, Konstantin Belousov wrote:
> >On Thu, Apr 05, 2012 at 10:54:31AM -0500, Alan Cox wrote:
> >>On 04/04/2012 02:17, Konstantin Belousov wrote:
> >>>On Tue, Apr 03, 2012 at 11:02:53PM +0400, Andrey Zonov wrote:
> Hi,
>
On 04/04/2012 02:17, Konstantin Belousov wrote:
On Tue, Apr 03, 2012 at 11:02:53PM +0400, Andrey Zonov wrote:
Hi,
I open the file, then call mmap() on the whole file and get pointer,
then I work with this pointer. I expect that page should be only once
touched to get it into the memory (disk c
On 04/06/2012 03:38, Konstantin Belousov wrote:
On Thu, Apr 05, 2012 at 01:25:49PM -0500, Alan Cox wrote:
On 04/05/2012 12:31, Konstantin Belousov wrote:
On Thu, Apr 05, 2012 at 10:54:31AM -0500, Alan Cox wrote:
On 04/04/2012 02:17, Konstantin Belousov wrote:
On Tue, Apr 03, 2012 at 11:02:53P
On 06.04.2012 12:13, Konstantin Belousov wrote:
On Thu, Apr 05, 2012 at 11:54:53PM +0400, Andrey Zonov wrote:
On 05.04.2012 23:41, Konstantin Belousov wrote:
On Thu, Apr 05, 2012 at 11:33:46PM +0400, Andrey Zonov wrote:
On 05.04.2012 19:54, Alan Cox wrote:
On 04/04/2012 02:17, Konstantin Belo
On Mon, Apr 09, 2012 at 11:17:41AM +0400, Andrey Zonov wrote:
> On 06.04.2012 12:13, Konstantin Belousov wrote:
> >On Thu, Apr 05, 2012 at 11:54:53PM +0400, Andrey Zonov wrote:
> >>On 05.04.2012 23:41, Konstantin Belousov wrote:
> >>>On Thu, Apr 05, 2012 at 11:33:46PM +0400, Andrey Zonov wrote:
> >
On Mon, Apr 9, 2012 at 1:18 PM, Konstantin Belousov wrote:
> On Mon, Apr 09, 2012 at 11:17:41AM +0400, Andrey Zonov wrote:
>> On 06.04.2012 12:13, Konstantin Belousov wrote:
>> >On Thu, Apr 05, 2012 at 11:54:53PM +0400, Andrey Zonov wrote:
[snip]
>> >>I always thought that active memory this is a
On Mon, Apr 09, 2012 at 03:35:30PM +0400, Andrey Zonov wrote:
> On Mon, Apr 9, 2012 at 1:18 PM, Konstantin Belousov
> wrote:
> > On Mon, Apr 09, 2012 at 11:17:41AM +0400, Andrey Zonov wrote:
> >> On 06.04.2012 12:13, Konstantin Belousov wrote:
> >> >On Thu, Apr 05, 2012 at 11:54:53PM +0400, Andre
On Thursday, April 05, 2012 11:54:31 am Alan Cox wrote:
> On 04/04/2012 02:17, Konstantin Belousov wrote:
> > On Tue, Apr 03, 2012 at 11:02:53PM +0400, Andrey Zonov wrote:
> >> Hi,
> >>
> >> I open the file, then call mmap() on the whole file and get pointer,
> >> then I work with this pointer. I
On 04/09/2012 10:26, John Baldwin wrote:
On Thursday, April 05, 2012 11:54:31 am Alan Cox wrote:
On 04/04/2012 02:17, Konstantin Belousov wrote:
On Tue, Apr 03, 2012 at 11:02:53PM +0400, Andrey Zonov wrote:
Hi,
I open the file, then call mmap() on the whole file and get pointer,
then I work w
On 10.04.2012 20:19, Alan Cox wrote:
On 04/09/2012 10:26, John Baldwin wrote:
On Thursday, April 05, 2012 11:54:31 am Alan Cox wrote:
On 04/04/2012 02:17, Konstantin Belousov wrote:
On Tue, Apr 03, 2012 at 11:02:53PM +0400, Andrey Zonov wrote:
Hi,
I open the file, then call mmap() on the who
On 04/11/2012 01:07, Andrey Zonov wrote:
On 10.04.2012 20:19, Alan Cox wrote:
On 04/09/2012 10:26, John Baldwin wrote:
On Thursday, April 05, 2012 11:54:31 am Alan Cox wrote:
On 04/04/2012 02:17, Konstantin Belousov wrote:
On Tue, Apr 03, 2012 at 11:02:53PM +0400, Andrey Zonov wrote:
Hi,
I
On 4/30/12 3:49 AM, Alan Cox wrote:
On 04/11/2012 01:07, Andrey Zonov wrote:
On 10.04.2012 20:19, Alan Cox wrote:
On 04/09/2012 10:26, John Baldwin wrote:
On Thursday, April 05, 2012 11:54:31 am Alan Cox wrote:
On 04/04/2012 02:17, Konstantin Belousov wrote:
On Tue, Apr 03, 2012 at 11:02:53P
Andrey writes:
> Wired memory: kernel memory and yes, application may get wired memory
> through mlock()/mlockall(), but I haven't seen any real application
> which calls mlock().
Apps with real time considerations may need to lock memory to prevent
having to wait for page/swap.
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