Re: [foxboro] CP Block Processor Memory Management
- From: "Johnson, Alex P (IPS)" <alex.johnson@xxxxxxxxxxxxxxxx>
- To: foxboro@xxxxxxxxxxxxx
- Date: Thu, 6 Oct 2005 16:48:11 -0400
Re: Question1: will the new block moved to the end of the memory or =
will it
be split onto two areas?
Blocks are stored contiguously.
Re: Question2: If this maneuver creates some empty spaces within the =
memory,
will these spaces be filled with new blocks or existing one which have =
been
modified?
Space is reused if the new block fits. Altering a block parameter will =
not
cause it to move (other than HLBL blocks which are resized).
Re: Question3: What happen if I create a block which needs more space =
than
pre-allocated with the CSPACE parameter?
It depends on the version of the CP. At one time, there was a defect =
where a
new sequence block could not fit and the old one had been deleted. This =
was
changed to add the new block before removing the old one.=20
I do not remember the version in which this was done.
Re: Basically, the SHRINK command affects the work file. Is there any =
way to
do the same on the CP's memory without doing a reboot?
No. A reboot is required.
Re: Will this problem occur in case of Fault tolerant modules?
Yes.
Re: Is the memory "snapshot" of =3D the two CPFT necessary the exact =
copy?
There is only one snapshot - the checkpoint file. The secondary module =
is
reloaded from the primary module's memory - not the boot host's =
checkpoint
file.
Regards,
=20
Alex Johnson
Invensys Systems, Inc.
10707 Haddington
Houston, TX 77063
+1 713 722 2859 (voice)
+1 713 932 0222 (fax)
+1 713 722 2700 (switchboard)
alex.johnson@xxxxxxxxxxxxxxxx
I hope to see you at the Invensys Process System User Group meeting =
October
3-6 in Houston, TX -=20
www.invensys.com/usergroup2005
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx =
[mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of "Perrot, Fran=E7ois"
Sent: Thursday, October 06, 2005 9:46 AM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro]=20
Content-Type: text/plain;
charset=3D"iso-8859-1"
Content-Transfer-Encoding: quoted-printable
=3D20
Dear all,
=3D20
I am facing a problem regarding the CP60 memory management when using =
=3D
lots
of sequential blocks.
=3D20
According my understanding of the Foxboro documentation, the parameter
CSPACE is booking a certain amount of memory within the limit of =
32Kb.=3D20
=3D20
e.g. I would like to modify an existing sequential block (IND) using
CSIZE=3D3D20kb and CSPACE=3D3D0 with the new parameters like =
CSIZE=3D3D20kb =3D
and CSPACE
30kb
=3D20
Question1: will the new block moved to the end of the memory or will it =
=3D
be
split onto two areas?
=3D20
Question2: If this manoeuvre creates some empty spaces within the =3D
memory,
will these spaces be filled with new blocks or existing one which have =
=3D
been
modified?
=3D20
Question3: What happen if I create a block which need more space than
pre-allocated with the CSPACE parameter?
=3D20
Basically, the SHRINK command affects the work file. Is there any way =
=3D
to do
the same on the CP's memory without doing a reboot. Will this problem
occurs in case of Fault tolerant modules. (is the memory "snapshot" of =
=3D
the
two CPFT necessary the exact copy?)
=3D20
Thanks.
=3D20
Fran=3DE7ois PERROT
=3D20
<http://www.fp-consulting.com>=3D20
=3D20
=3D20
Francois Perrot
Consultant=3D20
FP consulting=3D20
<mailto:francois.perrot@xxxxxxxxxxxxxxxx> =3D
francois.perrot@xxxxxxxxxxxxxxxx=3D20
mobile:=3D20
(060) 941-2129=3D20
=3D20
=3D
<https://www.plaxo.com/add_me?u=3D3D17180619476&v0=3D3D1479401&k0=3D3D19=
868609=3D
79> Add
me to your address book...
<http://www.plaxo.com/signature> Want a signature like this?
=3D20
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=20
=20
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=20
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