[DUG] Memcheck

Thu Dec 1 12:09:13 NZDT 2005

There is nothing wrong with leaving memcheck in, except you cant turn on  
optimization, i think it can
cause a problem. However, Fastmm is better for production.

On Thu, 01 Dec 2005 11:50:23 +1300, John Bird <johnkbird at paradise.net.nz>  
wrote:

> Well I never!!! You are right.  The memory use drops right back after
> minimise and restore. So do I blame Bill?
>
> I am still suspicious however - I was expecting to have MemCheck tell me  
> all
> sorts of humbling things...
> Surely I can’t have done it right first time around as I was learning????
>
> I notice in the notes for Memcheck that it replaces Delphis memory  
> manager
> with its own (in order to monitor everything no doubt) so is there any
> issues about leaving it in or removing it from real field or production
> versions of programs - and there is also the extra compiler and linker
> extras all being turned on.
>
> John
>
>
> -----Original Message-----
> From: delphi-bounces at ns3.123.co.nz [mailto:delphi-bounces at ns3.123.co.nz]  
> On
> Behalf Of Sean Cross - CRM
> Sent: Thursday, 1 December 2005 11:34 a.m.
> To: NZ Borland Developers Group - Delphi List
> Subject: RE: [DUG] Memcheck
>
>
> Try minimising and restoring your app to see if that makes a  
> difference.  It
> seems to be a windows issue where the working set gradually increases as  
> you
> allocate and deallocate memory.  Doing a minimise causes windows to  
> compact
> the working set.  I believe that windows will also do this if memory
> pressure gets too great.
>
> I get the same thing where one app gradually gets up to about 40meg  
> usage.
> Minimising and restoring reduces it to  4meg.
>
> Regards
>
> Sean
> -----------------------------
> Sean Cross
> Systems Development
>
> CRM
> PO Box 230
> Napier
> Phone:   06 835 5868
> Mobile:  021 270 3466
> Email:   sean.cross at crm.co.nz
>
>
>
>> -----Original Message-----
>> From: delphi-bounces at ns3.123.co.nz
>> [mailto:delphi-bounces at ns3.123.co.nz] On Behalf Of John Bird
>> Sent: Thursday, 1 December 2005 11:27 a.m.
>> To: 'NZ Borland Developers Group - Delphi List'
>> Subject: [DUG] Memcheck
>>
>> As a relative newbie I put memcheck in my biggest program,
>> which has about
>> 10-12 forms.  The app does the Delphi default of creating
>> them all at the program start, I am happy with this as it is
>> perfectly fast enough, and anyway I expect them to be shown
>> and closed repeatedly - the program does form.show and
>> form.close as it uses the forms as they get opened and closed
>> repeatedly, often returning to just the main form open.
>>
>> I have noticed in Task Manager and process explorer that the
>> memory usage of the program does gradually increase as I open
>> and close forms repeatedly, so I assumed, OK I am doing
>> something wrong and should track it down.  On putting
>> memcheck in the program (add to uses, add memchk after begin
>> in the DPR, tick all the compiler and linker options) I ran
>> it, watching the memory increase from 4MB to 6MB as I opened
>> and closed all the forms a few times, then looked at the log
>> which looks like:
>>
>> MemCheck version 2.73
>>
>> Total leak: 0 bytes
>>
>>
>> *** MEMCHK: Blocks STILL allocated ***
>>
>> *** MEMCHK: End of allocated blocks ***
>>
>>
>> *** MEMCHK: Chronological leak information ***
>>
>>
>> *** MEMCHK: End of chronological leak information ***
>>
>>
>> *** MEMCHK: Blocks written to after destruction ***
>>
>> 	Bad blocks count: 0
>>
>>
>> *** MEMCHK: End of blocks written to after destruction ***
>>
>>
>> So which is right?  If there are no leaks why does the memory
>> used go up gradually even as I return the original starting form??
>>
>> John
>>
>>
>>
>> -----Original Message-----
>> From: delphi-bounces at ns3.123.co.nz
>> [mailto:delphi-bounces at ns3.123.co.nz] On Behalf Of Wayne Roser
>> Sent: Thursday, 1 December 2005 7:13 a.m.
>> To: NZ Borland Developers Group - Delphi List
>> Subject: Re: [DUG] app terminating abruptly
>>
>>
>> PLUG FOR MEMCHECK
>> MemCheck is wonderful. As soon as I start every new app, I
>> make the bottom of the main unit look
>> like:
>>
>> initialization
>>   memchk;
>> end.
>>
>> As Kyley says, put
>> uses
>>   Memcheck,
>>
>> and the path to the folder containing memcheck source in your
>> default project search path. Mine looks like: C:\Program
>> Files\Borland\Delphi6\Imports\Memcheck
>>
>> Don't (like me) forget Kyley's note:
>> Make sure Stack is turned on in compiler options etc, and
>> td32 debug info to get relevant information.
>>
>> REASON FOR DETAIL
>> I put these little details in because I remember being a
>> newer newbie than I am right now and, you know, there might
>> be a newer newbie who, like me, watches this list and wonders
>> if there'll be anything really simple popping up. If you have
>> an embarassingly simple question out there, email the list so
>> that I can learn from the answers too. Ooo, I feel so
>> self-conscious baring my soul to an email list. Betcha I'm
>> gonna regret this. Note to self:
>> pull head back in.
>>
>> MAIN THING ABOUT MEMCHECK
>> But the main thing is to get memcheck in early. Anyone else
>> felt the pain?
>> Chuck it into some app that you've been developing for years,
>> the prototype that you've never quite got around to
>> rewriting, <insert own example here>, and it'll probably
>> bring tears to your eyes. Quite a good way to get you to
>> start on a rewrite from my (meagre) experience.
>>
>> Wayne Roser (not real name, really Dusan Slopovic, because
>> pen name make more anonymous)
>>
>> NZ Borland Developers Group - Delphi List
>> <delphi at ns3.123.co.nz> on Wednesday, 30 November 2005 at 5:55
>> p.m. +0000 wrote:
>> >Not yet.  I haven't had time to work out how to use it yet.
>> So far the
>> >HandleMessage in the DLL routine seems to have resolved it,
>> but if not
>> >then I'll try memcheck.
>> >
>> >----- Original Message -----
>> >From: "Kyley Harris" <kyleyharris at gmail.com>
>> >To: "NZ Borland Developers Group - Delphi List"
>> <delphi at ns3.123.co.nz>
>> >Sent: Wednesday, November 30, 2005 3:36 PM
>> >Subject: Re: [DUG] app terminating abruptly
>> >
>> >
>> >Have you run memcheck yet?
>>
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-- 
Kyley Harris
+64-21-671821