Re: [ECOS] time slicing problem

Re: [ECOS] time slicing problem

[Gary Thomas]

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On Mon, 2003-11-03 at 08:44, Luca Formaggio wrote:
>  --- Gary Thomas <gary@mlbassoc.com> ha scritto: > On
> Mon, 2003-11-03 at 08:19, Luca Formaggio wrote:
> > > Hi. 
> > > I need that my application that run over ecos run
> > > continuously whitout any interruptions of the
> > operatig
> > > system. It is possible? I try to recompile ecos
> > > whitout the scheduler timeslicing option but I
> > receive
> > > a build error. 
> > 
> > What do you mean "without any interruptions?"  If
> > you want
> > some code to "just run" - why do you need an OS at
> > all?  What
> > facilities of the operating system are you using?
> > 
> > -- 
> > Gary Thomas <gary@mlbassoc.com>
> > MLB Associates
> > 
> > 
> > -- 
> > Before posting, please read the FAQ:
> > http://sources.redhat.com/fom/ecos
> > and search the list archive:
> > http://sources.redhat.com/ml/ecos-discuss
> >  
> I have a function that consume a specified number of
> clock cycles, this number is a parameter of this
> function. But in some cases the function consume a
> number of cycles greater than the number in the
> parameter. This problem happens at constant time
> interval. I think that is the o.s. that ''preempt''
> the thread when the time slice is reached. My
> reasoning is correct?

More likely, this is happening when the system clock "ticks".
If you have such a function which cannot tolerate this, i.e.
it must run in a particular number of cycles, you could turn
off the interrupts.  On the other hand, if you have such a 
function, why do you need an operating system at all?

-- 
Gary Thomas <gary@mlbassoc.com>
MLB Associates


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Re: [ECOS] time slicing problem

[Luca Formaggio]

 --- Gary Thomas <gary@mlbassoc.com> ha scritto: >
Please copy your email to the list so that all may
> benefit.
> Private email support from MLB Associates is only
> available
> under contract.
> 
> On Mon, 2003-11-03 at 08:44, Luca Formaggio wrote:
> >  --- Gary Thomas <gary@mlbassoc.com> ha scritto: >
> On
> > Mon, 2003-11-03 at 08:19, Luca Formaggio wrote:
> > > > Hi. 
> > > > I need that my application that run over ecos
> run
> > > > continuously whitout any interruptions of the
> > > operatig
> > > > system. It is possible? I try to recompile
> ecos
> > > > whitout the scheduler timeslicing option but I
> > > receive
> > > > a build error. 
> > > 
> > > What do you mean "without any interruptions?" 
> If
> > > you want
> > > some code to "just run" - why do you need an OS
> at
> > > all?  What
> > > facilities of the operating system are you
> using?
> > > 
> > > -- 
> > > Gary Thomas <gary@mlbassoc.com>
> > > MLB Associates
> > > 
> > > 
> > > -- 
> > > Before posting, please read the FAQ:
> > > http://sources.redhat.com/fom/ecos
> > > and search the list archive:
> > > http://sources.redhat.com/ml/ecos-discuss
> > >  
> > I have a function that consume a specified number
> of
> > clock cycles, this number is a parameter of this
> > function. But in some cases the function consume a
> > number of cycles greater than the number in the
> > parameter. This problem happens at constant time
> > interval. I think that is the o.s. that
> ''preempt''
> > the thread when the time slice is reached. My
> > reasoning is correct?
> 
> More likely, this is happening when the system clock
> "ticks".
> If you have such a function which cannot tolerate
> this, i.e.
> it must run in a particular number of cycles, you
> could turn
> off the interrupts.  On the other hand, if you have
> such a 
> function, why do you need an operating system at
> all?
> 
> -- 
> Gary Thomas <gary@mlbassoc.com>
> MLB Associates
>  
I try to explain me:
I have a ISS(powerpc simulator), on this ISS run my
application whit ecos o.s.. When the application is
stopped on a breakpoint I use the GDB 'call' command
for run a function of my program that consume a
predetermined number of clock cycles. This call is for
sincronization of the time of the ISS whith another
exeternal program(SystemC). Every a approximately 5000
clock cycles the function it makes to be left over the
clocks counter of approximately 1000 cycles with loss
of syncronization. I think that these 1000 cycles in
excess are the results of the preempt of the o.s. that
suspend the process for internal operations and then
resume it. I need that the execution of the function
that consume cycles is executed without interruptions.
For the problem of compiling ecos. When i compile
without the scheduler timeslicing option in the kernel
scheduler section, I receive this error:

powerpc-eabi-gcc -c 
-I/home/formaggi/ecos/work/powerpc_no_timeslice_install/include
-I/home/formaggi/ecos/ecos-2.0/packages/compat/posix/v2_0
-I/home/formaggi/ecos/ecos-2.0/packages/compat/posix/v2_0/src
-I/home/formaggi/ecos/ecos-2.0/packages/compat/posix/v2_0/tests
-I.
-I/home/formaggi/ecos/ecos-2.0/packages/compat/posix/v2_0/src/
-mcpu=603 -msoft-float -Wall -Wpointer-arith
-Wstrict-prototypes -Winline -Wundef
-Woverloaded-virtual -g -O2 -ffunction-sections
-fdata-sections -fno-rtti -fno-exceptions -fvtable-gc
-finit-priority -Wp,-MD,src/mqueue.tmp -o
src/compat_posix_mqueue.o
/home/formaggi/ecos/ecos-2.0/packages/compat/posix/v2_0/src/mqueue.cxx
In file included from
/home/formaggi/ecos/ecos-2.0/packages/compat/posix/v2_0/src/pprivate.h:72,
make[1]: Leaving directory
`/home/formaggi/ecos/work/powerpc_no_timeslice_build/compat/posix/v2_0'
                 from
/home/formaggi/ecos/ecos-2.0/packages/compat/posix/v2_0/src/mqueue.cxx:89:
make: Leaving directory
`/home/formaggi/ecos/work/powerpc_no_timeslice_build'
/home/formaggi/ecos/work/powerpc_no_timeslice_install/include/cyg/posix/export.h:100:
parse

   error before `*' token
/home/formaggi/ecos/work/powerpc_no_timeslice_install/include/cyg/posix/export.h:102:
parse
   error before `*' token
make[1]: *** [src/mqueue.o.d] Error 1
make: *** [build] Error 2





Thanks 

Luca Formaggio

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Re: [ECOS] time slicing problem

[Gary Thomas]

On Mon, 2003-11-03 at 09:34, Luca Formaggio wrote:
>  --- Gary Thomas <gary@mlbassoc.com> ha scritto: >
> Please copy your email to the list so that all may
> > benefit.
> > Private email support from MLB Associates is only
> > available
> > under contract.
> > 
> > On Mon, 2003-11-03 at 08:44, Luca Formaggio wrote:
> > >  --- Gary Thomas <gary@mlbassoc.com> ha scritto: >
> > On
> > > Mon, 2003-11-03 at 08:19, Luca Formaggio wrote:
> > > > > Hi. 
> > > > > I need that my application that run over ecos
> > run
> > > > > continuously whitout any interruptions of the
> > > > operatig
> > > > > system. It is possible? I try to recompile
> > ecos
> > > > > whitout the scheduler timeslicing option but I
> > > > receive
> > > > > a build error. 
> > > > 
> > > > What do you mean "without any interruptions?" 
> > If
> > > > you want
> > > > some code to "just run" - why do you need an OS
> > at
> > > > all?  What
> > > > facilities of the operating system are you
> > using?
> > > > 
> > > > -- 
> > > > Gary Thomas <gary@mlbassoc.com>
> > > > MLB Associates
> > > > 
> > > > 
> > > > -- 
> > > > Before posting, please read the FAQ:
> > > > http://sources.redhat.com/fom/ecos
> > > > and search the list archive:
> > > > http://sources.redhat.com/ml/ecos-discuss
> > > >  
> > > I have a function that consume a specified number
> > of
> > > clock cycles, this number is a parameter of this
> > > function. But in some cases the function consume a
> > > number of cycles greater than the number in the
> > > parameter. This problem happens at constant time
> > > interval. I think that is the o.s. that
> > ''preempt''
> > > the thread when the time slice is reached. My
> > > reasoning is correct?
> > 
> > More likely, this is happening when the system clock
> > "ticks".
> > If you have such a function which cannot tolerate
> > this, i.e.
> > it must run in a particular number of cycles, you
> > could turn
> > off the interrupts.  On the other hand, if you have
> > such a 
> > function, why do you need an operating system at
> > all?
> > 
> > -- 
> > Gary Thomas <gary@mlbassoc.com>
> > MLB Associates
> >  
> I try to explain me:
> I have a ISS(powerpc simulator), on this ISS run my
> application whit ecos o.s.. When the application is
> stopped on a breakpoint I use the GDB 'call' command
> for run a function of my program that consume a
> predetermined number of clock cycles. This call is for
> sincronization of the time of the ISS whith another
> exeternal program(SystemC). Every a approximately 5000
> clock cycles the function it makes to be left over the
> clocks counter of approximately 1000 cycles with loss
> of syncronization. I think that these 1000 cycles in
> excess are the results of the preempt of the o.s. that
> suspend the process for internal operations and then
> resume it. I need that the execution of the function
> that consume cycles is executed without interruptions.
> For the problem of compiling ecos. When i compile
> without the scheduler timeslicing option in the kernel
> scheduler section, I receive this error:
> 
> powerpc-eabi-gcc -c 
> -I/home/formaggi/ecos/work/powerpc_no_timeslice_install/include
> -I/home/formaggi/ecos/ecos-2.0/packages/compat/posix/v2_0
> -I/home/formaggi/ecos/ecos-2.0/packages/compat/posix/v2_0/src
> -I/home/formaggi/ecos/ecos-2.0/packages/compat/posix/v2_0/tests
> -I.
> -I/home/formaggi/ecos/ecos-2.0/packages/compat/posix/v2_0/src/
> -mcpu=603 -msoft-float -Wall -Wpointer-arith
> -Wstrict-prototypes -Winline -Wundef
> -Woverloaded-virtual -g -O2 -ffunction-sections
> -fdata-sections -fno-rtti -fno-exceptions -fvtable-gc
> -finit-priority -Wp,-MD,src/mqueue.tmp -o
> src/compat_posix_mqueue.o
> /home/formaggi/ecos/ecos-2.0/packages/compat/posix/v2_0/src/mqueue.cxx
> In file included from
> /home/formaggi/ecos/ecos-2.0/packages/compat/posix/v2_0/src/pprivate.h:72,
> make[1]: Leaving directory
> `/home/formaggi/ecos/work/powerpc_no_timeslice_build/compat/posix/v2_0'
>                  from
> /home/formaggi/ecos/ecos-2.0/packages/compat/posix/v2_0/src/mqueue.cxx:89:
> make: Leaving directory
> `/home/formaggi/ecos/work/powerpc_no_timeslice_build'
> /home/formaggi/ecos/work/powerpc_no_timeslice_install/include/cyg/posix/export.h:100:
> parse
> 
>    error before `*' token
> /home/formaggi/ecos/work/powerpc_no_timeslice_install/include/cyg/posix/export.h:102:
> parse
>    error before `*' token
> make[1]: *** [src/mqueue.o.d] Error 1
> make: *** [build] Error 2

Try building the kernel using the 'minimal' template.

I still find it odd that you want to run some function and count cycles,
but you've build a kernel which includes most everything, including 
POSIX support.  This seems to be contradictory to me.  If all you want
to do is run some PowerPC function and count cycles, you don't need
the OS at all.  However, if you need OS functionality, then counting
cycles doesn't make sense.

-- 
Gary Thomas <gary@mlbassoc.com>
MLB Associates


-- 
Before posting, please read the FAQ: http://sources.redhat.com/fom/ecos
and search the list archive: http://sources.redhat.com/ml/ecos-discuss

RE: [ECOS] time slicing problem

[Michael Trozzo]

I've noticed this a few times.  Apparently, when someone hits 'Reply',
it replies only to the original sender, instead of to the list (reply
goes to the list on all the others I'm on except for Cygwin).  'Reply to
all' does the trick, though.

Mike Trozzo

 
-----Original Message-----
From: ecos-discuss-owner@sources.redhat.com
[mailto:ecos-discuss-owner@sources.redhat.com] On Behalf Of Gary Thomas
Sent: Montag, 3. November 2003 16:49
To: Luca Formaggio
Cc: eCos Discussion
Subject: Re: [ECOS] time slicing problem


Please copy your email to the list so that all may benefit. Private
email support from MLB Associates is only available under contract.




-- 
Before posting, please read the FAQ: http://sources.redhat.com/fom/ecos
and search the list archive: http://sources.redhat.com/ml/ecos-discuss

[ECOS] time slicing problem

[Luca Formaggio]

Hi. 
I need that my application that run over ecos run
continuously whitout any interruptions of the operatig
system. It is possible? I try to recompile ecos
whitout the scheduler timeslicing option but I receive
a build error. 

Thanks

Luca Formaggio

______________________________________________________________________
Yahoo! Mail: 6MB di spazio gratuito, 30MB per i tuoi allegati, l'antivirus, il filtro Anti-spam
http://it.yahoo.com/mail_it/foot/?http://it.mail.yahoo.com/

-- 
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and search the list archive: http://sources.redhat.com/ml/ecos-discuss

Re: [ECOS] time slicing problem

[Gary Thomas]

On Mon, 2003-11-03 at 08:19, Luca Formaggio wrote:
> Hi. 
> I need that my application that run over ecos run
> continuously whitout any interruptions of the operatig
> system. It is possible? I try to recompile ecos
> whitout the scheduler timeslicing option but I receive
> a build error. 

What do you mean "without any interruptions?"  If you want
some code to "just run" - why do you need an OS at all?  What
facilities of the operating system are you using?

-- 
Gary Thomas <gary@mlbassoc.com>
MLB Associates


-- 
Before posting, please read the FAQ: http://sources.redhat.com/fom/ecos
and search the list archive: http://sources.redhat.com/ml/ecos-discuss