[DUG] D2010 and XE on the same machine

[Jason Coley]

Sorry what was that registry key again?

-----Original Message-----
From: delphi-bounces at delphi.org.nz [mailto:delphi-bounces at delphi.org.nz] On Behalf Of Paul Heinz
Sent: Wednesday, 10 November 2010 11:20 a.m.
To: NZ Borland Developers Group - Delphi List
Subject: Re: [DUG] D2010 and XE on the same machine

Hi Jeremy 

> the HEX is c3000

OK - that's the standard Windows XP SP2 value. You're fine.

On some machines, especially HP laptops and desktops, you'll find the value is hex 0xffffffff (i.e. -1) which is a BAD thing since it means 'allocate as many system pages as possible at the expense of paged pool and file system cache'. 

What is especially nasty about this setting is that the more physical RAM you have, the more system pages it takes and the worse it gets. We found performance actually got worse on the HP laptops when we went from 2Gb to 4Gb thinking that insufficient RAM was the issue.

Delphi performs really poorly with big projects if you have lots of directories in your Delphi library path since the file system cache can't keep the directory pages in the file system cache and Delphi does incredible amounts of directory entry lookups via GetFileAttributesEx calls.

Interestingly, reading between the lines, hooking those calls and using a private in-memory hashtable cache is some of what the IDEfixpack seems to be doing to speed up Code Insight.

Cheers,
  Paul.



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