2Gig limitation - is this limited to Unix or does it also affect VMS?

Wed, 2 Feb 2005 17:15:01 -0000

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I think a test case was logged on Unix using a QTP which attempted to write
records out to a subfile, and once the number of bytes written out exceeded
2^31 a fatal error occurred.  I then recall that this behaviour was fixed to
the extent that now the failure ( not error as this is a new limitation )
will occur when 2^31 'records' have been written.

I assume that quick would have the same problem when reading or writing
similar numbers of records, but I am not clear if this affects Unix only, or
if VMS would suffer similarly.

I seem to recall that BD once said that this would affect RDB's also, as the
call originally related to CISAM, I do not know if RMS on VMS is affected.

I'm not thinking of the quick screen call issue, but the underlying causes
might be related as far as I know.

I seem to recall that the limitation was a result of PH being a 32 bit
application - and presumably able to map to 'only' 2^31 addresses on the
stack.

Regards, Joe. 

  _____  

From: Johnson, Harold A EDUC:EX [mailto:Harold.A.Johnson@gems1.gov.bc.ca] 
Sent: 02 February 2005 16:37
To: 'Joe Boyle'; powerh-l@lists.sowder.com
Subject: RE: 2Gig limitation

Do you mean in QTP (ie: total size of records accessed?) or QDESIGN/QUICK?
There is a problem on OpenVMS/Powerhouse when calling screens (run screen)
in batch processing using QUICK - there is a limit as to how many times
screens can be called (~32k times).  Otherwise, I've never experienced a
problem with the number or size of data processed.    (our main application
is current hovering around the 160gb size)

-----Original Message-----
From: powerh-l-admin@lists.sowder.com
[mailto:powerh-l-admin@lists.sowder.com]On Behalf Of Joe Boyle
Sent: 2005 February 2 5:08 AM
To: powerh-l@lists.sowder.com
Subject: 2Gig limitation

Hi all,

Does anyone know if the 2 Gig processing limitation applies on VMS platforms
as well as Unix ? 

If the problem is due to the fact that PH is a 32 bit application, and I am
assuming that PH is a 32 bit application on both VMS and Unix, then the
problem is likely to exist on both - any ideas ?

For those that may not be aware of it, the limitation on Unix was that
processing would stop after processing 2 Gig bytes had been processed. This
was then partially fixed so that processing would stop when 2 Gig records (
of any acceptable byte length ) had been processed.

Regards, Joe.

This e-mail and all information contained in it is confidential and may be
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<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>I think a test case was logged on =
Unix
using a QTP which attempted to write records out to a subfile, and once =
the number
of bytes written out exceeded 2^31 a fatal error occurred.&nbsp; I then =
recall
that this behaviour was fixed to the extent that now the failure ( not =
error as
this is a new limitation ) will occur when 2^31 &#8216;records&#8217; =
have been
written.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>I assume that quick would have the =
same
problem when reading or writing similar numbers of records, but I am not =
clear
if this affects Unix only, or if VMS would suffer =
similarly.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>I seem to recall that BD once said =
that
this would affect RDB&#8217;s also, as the call originally related to =
CISAM, I
do not know if RMS on VMS is affected.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>I&#8217;m not thinking of the quick =
screen
call issue, but the underlying causes might be related as far as I =
know.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>I seem to recall that the =
limitation was a
result of PH being a 32 bit application &#8211; and presumably able to =
map to &#8216;only&#8217;
2^31 addresses on the stack.<o:p></o:p></span></font></p>

<div>

<p><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:10.0pt;font-family:
Arial;color:navy'>Regards, Joe.</span></font><font color=3Dnavy><span
style=3D'color:navy'> <o:p></o:p></span></font></p>

</div>

<div>

<div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><font =
size=3D3
face=3D"Times New Roman"><span style=3D'font-size:12.0pt'>

<hr size=3D3 width=3D"100%" align=3Dcenter tabindex=3D-1>

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<p class=3DMsoNormal><b><font size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font =
size=3D2
face=3DTahoma><span style=3D'font-size:10.0pt;font-family:Tahoma'> =
Johnson, Harold
A EDUC:EX [mailto:Harold.A.Johnson@gems1.gov.bc.ca] <br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> 02 February 2005 =
16:37<br>
<b><span style=3D'font-weight:bold'>To:</span></b> 'Joe Boyle';
powerh-l@lists.sowder.com<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> RE: 2Gig =
limitation</span></font><o:p></o:p></p>

</div>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

<div>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:blue'>Do you mean in QTP (ie: total size =
of
records accessed?) or QDESIGN/QUICK?&nbsp;&nbsp;&nbsp; There is a =
problem on
OpenVMS/Powerhouse when calling screens (run screen) in batch processing =
using
QUICK - there is a limit as to how many times&nbsp;screens can be called =
(~32k
times).&nbsp; Otherwise, I've never experienced a problem with the =
number or
size of data processed.&nbsp;&nbsp;&nbsp; (our main application is =
current
hovering around the 160gb size)</span></font><o:p></o:p></p>

</div>

<div>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>&nbsp;<o:p></o:p></span></font></p>

</div>

<div>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>&nbsp;<o:p></o:p></span></font></p>

</div>

<blockquote =
style=3D'margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt'>

<p class=3DMsoNormal style=3D'margin-bottom:12.0pt'><font size=3D2 =
face=3DTahoma><span
style=3D'font-size:10.0pt;font-family:Tahoma'>-----Original =
Message-----<br>
<b><span style=3D'font-weight:bold'>From:</span></b> =
powerh-l-admin@lists.sowder.com
[mailto:powerh-l-admin@lists.sowder.com]<b><span =
style=3D'font-weight:bold'>On
Behalf Of </span></b>Joe Boyle<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> 2005 February 2 =
5:08 AM<br>
<b><span style=3D'font-weight:bold'>To:</span></b> =
powerh-l@lists.sowder.com<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> 2Gig =
limitation</span></font><o:p></o:p></p>

<p><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'><!-- Converted from =
text/rtf format -->Hi
all,</span></font><o:p></o:p></p>

<p><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'>Does
anyone know if the 2 Gig processing limitation applies on VMS platforms =
as well
as Unix ?</span></font> <o:p></o:p></p>

<p><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'>If
the problem is due to the fact that PH is a 32 bit application, =
and</span></font>
<font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'>I am
assuming that</span></font> <font size=3D2 face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial'>PH is a 32 bit application on both VMS and =
Unix, then
the problem is likely to exist on both</span></font> <font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>- any ideas =
?</span></font><o:p></o:p></p>

For
those that may not be aware of it, the limitation on Unix was that =
processing
would stop after processing 2 Gig bytes had been =
processed. This
was then partially fixed so that processing would stop when =
2 Gig
records ( of any acceptable byte length ) had been =
processed.<o:p></o:p>

<p><a name=3D""><font size=3D2 face=3DArial><span lang=3DEN-GB =
style=3D'font-size:10.0pt;
font-family:Arial'>Regards, Joe.</span></font></a><o:p></o:p></p>

This e-mail and all information contained in it is confidential =
and may
be legally privileged. If you are not the intended recipient, your =
access to
this e-mail is unauthorized. Any use, dissemination, distribution, =
publication
or copying by you of this e-mail or any of the information contained =
within it
is prohibited and may be unlawful. Do not open any attachments, delete =
it
immediately from your system and notify the sender promptly by e-mail =
that you
have done so. The content of this e-mail and any attachments sent with =
it may
have been altered without the consent or knowledge of the =
author.<o:p></o:p>

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