Re: [BLACKBOX] Illegal Memory Access with Windows 7 - Update 3

From: [at]} <Wojtek>
Date: Thu, 15 Aug 2013 12:26:52 -0400

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Robert:

no ideas, but a question. I thought that the newest version of Windows is
Windows 8 rather than 7?

W.


> A colleague has coded a version (a different random number generator!) of
> this test in C#.NET for X86 (ie a 32-bit version).
>
> The results on my two machines are:
>
> The statistics are: (Windows 7 / Windows XP)
> Number of good allocations: 6148 / 6082
> Number of failed allocations: 96354 / 96318
> Maximum amount allocated: 1795.4 / 1805.0 Million Bytes.
>
> So the 800 MByte memory limit does not seem to come from Windows 7.
>
> It looks like there has been some change to the WinApi interface that
> means that the way BlackBox gets its memory no
> longer works as well as it did / should.
>
> Any ideas, anyone?
>
> Regards
>
> Robert
>
>
>
>
> From: BlackBox [mailto:BLACKBOX{([at]})nowhere.xy
> Robert (Selex ES, UK)
> Sent: 15 August 2013 14:05
> To: BLACKBOX{([at]})nowhere.xy
> Subject: [BLACKBOX] Illegal Memory Access with Windows 7 - Update 2
>
>
> Romiras: – Thanks for your interesting and useful test module.
>
> I have modified it a little (attached as StdCoded & .pdf).
>
>
> All:
>
> I have run it on two systems:
> Both: 64-bit operating systems, 8 GByte RAM, patched
> BlackBox kernel and compiler as described below.
>
> The test does not crash.
>
> The statistics are: (Windows 7 / Windows XP)
> Number of good allocations: 3343 / 4866
> Number of failed allocations: 99057 / 97534
> Maximum amount allocated: 802,561,342 / 1607,954,078 Bytes.
>
> Conclusion: Windows 7 only provides access to half the memory available
> with Windows XP.
>
>
> I think I understand the XP / BlackBox 1600 MByte limit. A 31-bit address
> space give a potential for 2 GByte. In BlackBox
> 400 MByte is allocated to static / stack stuff, leaving 1600 MByte for the
> heap. The figure 1600 is a BlackBox Kernal constant
> chosen by Oms after discussion with their customers.
>
> I do not understand the Windows 7 limit of 800 MByte. Can it be explained
> and increased?
>
>
> Can someone run a version of this test code under another 32-bit compiler
> or language? I would like to understand if the limit
> is a Windows 7 limit, or if there is some remaining BlackBox issue that
> might be easy / possible to fix.
>
> Chris: Is GPCP a 32-bit or 64-bit system?
>
>
> Thanks,
> Regards,
>
> Robert.
>
>
>
>
>
>
> From: BlackBox [mailto:BLACKBOX{([at]})nowhere.xy
> Sent: 21 July 2013 12:29
> To: BLACKBOX{([at]})nowhere.xy
> Subject: Re: [BLACKBOX] AW: [BLACKBOX] Illegal Memory Access with Windows
> 7
>
> Hi, everyone.
> It looks that I found the way how to cause bug mentioned above. For this
> purpose I used small GC benchmark for D language run-time and adapted it
> for Component Pascal with some modifications.
>
> I tested on Windows XP with 2 GB, Windows 8 with 4 GB and in Linux/Wine
> with 4 GB. On all of these machine I reproduced a bug.
> If I use patched version of module Kernel by user luowy from September
> 2012, a bug didn't reproduced for me.
>
> Please compile and run an encoded module TestGCAlloc1 attached below:
>
> StdCoder.Decode
> --- end of encoding ---
>
> 2013/7/11 Campbell, Robert (Selex ES, UK)
> <robert.d.campbell{([at]})nowhere.xy
> Chris
>
> Thanks for this - you and Helmut are so much more organised than me!
>
> Marc's email contains updated versions of
> - Dev/Mod/Cpc486.odc
> - System/Mod/Kernel.odc
> & instructions on how to install these files.
>
> Luowy's email contains a later update to Kernel.odc.
>
>
> There is a problem with Cpc486. The problem involves mixing INTEGERs &
> LONGINTs, and has been discussed here more than once.
> The fix is to add one line; this fix was provided by Louwy on 19-Dec-2011
> (give or take a day or two!).
>
>
> I have just installed Marc's version of Cpc486 + Louwy's INTEGER fix, and
> Louwy's version of Kernel.
>
>
> This has certainly helped the Window's 7 memory problem; I have not used
> it enough yet to know if it is now reliable, but will
> report on that later.
>
> […]
>
>
> Thanks, Robert
>
>
>
> Selex ES Ltd
> Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex
> SS14 3EL
> A company registered in England & Wales. Company no. 02426132
> ********************************************************************
> This email and any attachments are confidential to the intended
> recipient and may also be privileged. If you are not the intended
> recipient please delete it from your system and notify the sender.
> You should not copy it or use it for any purpose nor disclose or
> distribute its contents to any other person.
> ********************************************************************
>

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Received on Thu Aug 15 2013 - 18:26:52 UTC