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[archive] performance / windows 2000 server

[Migrated content. Thread originally posted on 02 June 2003]

This may have something to do with it:

===================================
File Access to Windows Shared Files
===================================

On Windows systems, the speed of file access to Vision files located on a Windows shared drive can be variable. The cause of this variability is attributed to an imperfect interaction between the way the Windows operating system handles file locks and the way it caches shared files on the local system. In Version 4.3.1, to improve performance, the method used to access Vision files on Windows shared drives was changed. Subsequently, although most users have experienced good performance and no problems, some users have experienced sporadic file corruption problems (error 98, 90). To minimize the possibility of these errors, in Version 5.2.1 the runtime has reverted to the pre-4.3.1 method of opening files. Although this method can result in somewhat slower performance, it is safer. The faster method can still be used and is configurable via a Windows registry entry.

WARNING


Changing the Windows registry incorrectly can cause serious problems
that may necessitate a complete reinstallation of the operating
system. Changes to the Windows registry should be made only by a
qualified Windows system administrator. Changes to the
Windows registry are not recommended.

To change the runtime to use the faster, but riskier method of opening
files on Windows shared drives, in the registry key:

HKEY_LOCAL_MACHINE\Software\Acucorp, Inc.\ACUCOBOL-GT

manually set a registry value of type DWORD:

GetUniqueId Uses CreateFile

to the value "0". When this entry is set to "1" (the default),
the safer method is used.

Performance Tip: File OPENs are relatively expensive operations,
especially on DOS and Windows systems. Eliminating non-essential
file OPENs could significantly improve application performance.

=============

Acucorp Technical Support can provide further information regarding this issue and the other questions in your posting.

Thanks.

__________________
Kate Mooney
Director of Technical Services, Acucorp, Inc.
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RE: [archive] performance / windows 2000 server

Does anybody may help me ?

I Just come back from my client for an install of 5.2.1 Version (they had a 4.0.0 version initialy) on a 2000 server...

Due to the slower performance with this configuration, I had to enquire and call Acucorp France support. ACucorp send me a 'improve performance program' ( 1000 call of a program witch do 1000 compute )

This same program run twice faster with the runtime 16bit 4.0.0 than with the 32bit 5.2.1 version !
V4.0.0 : 13 second
V5.2.1 : 31 second

Does someone could tell me why .. and what should I do ?

Thank you .
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