Re: [Pharo-project] Fwd: [Vm-dev] Re: out of memory - cog on windows

Sat, 23 Apr 2011 12:07:52 -0700

I thought I'd mention... some supported Windows configurations require additional work to allow apps to use more than 2gb. So, even if you compile with (IIRC) /LARGEADDRESSAWARE, it may not always be enough. 

On 4/23/11 11:48 , Andres Valloud wrote:

Some seemingly useful items to start tracing through Google appear here...

http://groups.google.com/group/gnu.gcc.help/browse_thread/thread/b1548cd5e7c15a8b/05628751f5f46111?pli=1

On 4/23/11 6:17 , Igor Stasenko wrote:

On 23 April 2011 13:19, Alain_Rastoul<[email protected]>   wrote:

The code for memory allocation is in sqWin32Alloc.c
There is MAX_VIRTUAL_MEMORYMB reserved in virtual address space for each vm
(512MB)
   maxReserved = MAX_VIRTUAL_MEMORY;
   do {
     pageBase = VirtualAlloc(NULL,maxReserved,MEM_RESERVE, PAGE_NOACCESS);
     if(!pageBase) {
       if(maxReserved == nowReserved) break;
       /* make it smaller in steps of 128MB */
       maxReserved -= 128*1024*1024;
       if(maxReserved<   nowReserved) maxReserved = nowReserved;
     }
   } while(!pageBase);

I don't know gcc compilation flag for address space>   2G  for 32b apps on 64
bits ?
((MS) /LARGEADDRESSEPACE gcc equivalent ?)
Do you know it ?


No idea :)



"Andres Valloud"
<[email protected]>   a écrit dans le
message de news: [email protected]...

Does that mean that, even if your app uses 128mb of RAM, the VM will
allocate 512mb of memory regardless?  It seems a bit strange that just 1gb
worth of allocations would cause problems.  What about the load address of
the VM and the way the memory chunk is allocated?  Has the 32 bit VM been
compiled to indicate the app is 32 bit address aware (if not, address
space is limited to 2gb)?

On 4/22/11 14:44 , Mariano Martinez Peck wrote:



---------- Forwarded message ----------
From: *Andreas Raab*<[email protected]
<mailto:[email protected]>>
Date: Fri, Apr 22, 2011 at 3:01 PM
Subject: Re: [Vm-dev] Re: [Pharo-project] out of memory - cog on windows
To: [email protected]
<mailto:[email protected]>



FWIW, the reason for the 512MB limit has to do with Windows memory
layout. When you're running applications that load dynamic libraries
(directly or indirectly such as when using ODBC which loads further
DLLs) Windows needs (sometimes a lot of) address space to map these DLLs
in order to load them[*]. When the VM starts it grabs MAX_VIRTUAL_MEMORY
from the OS which will consequently not be available to map DLLs into.
We have found that depending on the libraries in use and depending on
the overall system utilization, loading DLLs would fail seemingly "at
random" which, after further investigation, we were able to track to
reserving too much address space upfront. We were able to show
experimentally, that changing the limit from 1GB to 512MB would on some
machines make all the difference.

[*] This is true in particular for libraries that create more threads as
the default Windows policy is to create threads with the stack size of
the application executable. Thus a 1MB default stack in the application
will by default create all further threads to be allocated with a 1MB
stack size. Of course all of this is subject to various other conditions.

In the end we concluded that 512MB is a reasonable size for most apps
and with 512MB we've never seen these random failures. You can increase
the limit by recompiling the VM, but if you ship your app in diverse
environments you should be aware of the potential issues.

Cheers,
     - Andreas

On 4/21/2011 22:44, Alain_Rastoul wrote:




Apparently, the vm allocates MAX_VIRTUAL_MEMORY and reduces by steps
of 128M until it
succeeds.
so I suppose it could be possible to allocate 2Gb and see how it runs
on a 1Gb system and if this is not too much stress for
the system (thinking of the pagefile) ?
Tudor is your vm a cog or non cog vm ?

      "Mariano Martinez Peck"
<[email protected]
      <mailto:[email protected]>>   a
écrit dans le message de news:

[email protected]

<mailto:[email protected]>...

      ------------------------------------------------------------------------


      On Thu, Apr 21, 2011 at 10:21 PM, Tudor Girba
      <[email protected]
<mailto:[email protected]>>   wrote:

          Hi,

          Should I to understand that the only way to enable more memory
          is to recompile the VM? Does that mean that there is no way to
          pass this information as a parameter like we can on Mac?


      As far as I know you can pass a parameter, but even so, it won't
      be able to allocate more than 512MB.
      I can compile the VM for you with this change in 5 minutes. But I
      am not sure that such simple code would make it work. I think such
      limit is there because of something. Otherwise, it sounds stupid
      imposing a limit just because.

          The problem is that I cannot recompile the VM because I have
          no access to a Windows machine. Is there one available that
          provides more memory?


      I don't think so, but start cc'ing the VM mailing list. You'd
      probably receive more help.

      Cheers

      Mariano

          Cheers,
          Doru


          On 21 Apr 2011, at 22:09, Alain_Rastoul wrote:

          >   Hi Tudor,
          >
          >   There is a constant in sqWin32Alloc.h (platforms\win32\vm) :
          >   #define MAX_VIRTUAL_MEMORY 512*1024*1024
          >   you can change it to whatever you want and rebuild the vm,
          >   for exzmple give all the available memory less 256 M .
          >
          >   HTH
          >
          >   Regards
          >   Alain
          >
          >   "Tudor Girba"
<[email protected]
          <mailto:[email protected]>>   a
écrit
          >   dans le message de news:

[email protected]

<mailto:[email protected]>...
          >   Hi,
          >
          >   We have no specific startUp: methods in Moose. In any case,
          the issue with
          >   opening the image does not seem to be related to startUp:.
          >
          >   Is it really true that the Cog VM is limited to 512MB of
memory?
          >
          >   Cheers,
          >   Doru
          >
          >
          >   On 21 Apr 2011, at 14:27, Luc Fabresse wrote:
          >
          >>   Hi Doru,
          >>
          >>   2011/4/21 Tudor Girba
          >>   <[email protected]
<mailto:[email protected]>>
          >>   Hi,
          >>
          >>
          >>
          >>   On Apr 21, 2011, at 14:06, Mariano Martinez Peck
          >>   <[email protected]
<mailto:[email protected]>>   wrote:
          >>
          >>>
          >>>
          >>>   On Thu, Apr 21, 2011 at 1:58 PM, Tudor Girba
          >>>   <[email protected]
<mailto:[email protected]>>   wrote:
          >>>>   Hi again,
          >>>>
          >>>>   I did not say what the problem was :). The problem was
          that when
          >>>>   opening the image on Windows, he got a Space is low
          message and the
          >>>>   image was not usable (see attachment).
          >>>
          >>>   That's weird. Does moose have something on the startup
          list?   something
          >>>   that can be bothering there?
          >>
          >>   Not that I know of. Is there a way to check this?
          >>
          >>   Classes should be registered using Smalltlak
          addToStartUpList: aClass
          >>   Then aClass class>>#startUp: is executed at startup.
          >>   So implementors of #startUp: on Moose classes should give
          you the answer.
          >>
          >>   #Luc
          >>
          >>
          >>   Actually, using exactly the same process some days ago he
          produced an
          >>   image of 190MB. This one works just fine on Windows. The
          only difference
          >>   between the two is the size of the loaded data.
          >>
          >>   It would be really bad news if the Windows vm would be so
          severely limited
          >>   in terms of memory.
          >>
          >>   Cheers,
          >>   Doru
          >>
          >>
          >>>
          >>>   On Mac it worked just fine.
          >>>>
          >>>>   Cheers,
          >>>>   Doru
          >>>>
          >>>>
          >>>
          >>>>
          >>>>
          >>>>
          >>>>   On 21 Apr 2011, at 12:52, Tudor Girba wrote:
          >>>>
          >>>>>   Hi,
          >>>>>
          >>>>>   I received a question from someone running a 200MB image
          on Windows
          >>>>>   using Cog 2361.
          >>>>>
          >>>>>   If I open the image on Mac, it works just fine.
          Unfortunately, I do
          >>>>>   not have a Windows machine around, and I cannot test but
          I believe it
          >>>>>   should be solvable by increasing the allocated memory.
          >>>>>
          >>>>>   On Mac, I would run it with: ./Croquet -memory 1500m
          >>>>>
          >>>>>   Can anyone help me with the right incantation for Windows?
          >>>>>
          >>>>>   Cheers,
          >>>>>   Doru
          >>>>>
          >>>>>
          >>>>>   --
          >>>>>   www.tudorgirba.com<http://www.tudorgirba.com>
          >>>>>
          >>>>>   "What we can governs what we wish."
          >>>>>
          >>>>>
          >>>>>
          >>>>>   <Space is low.png>
          >>>>
          >>>>   --
          >>>>   www.tudorgirba.com<http://www.tudorgirba.com>
          >>>>
          >>>>   "Yesterday is a fact.
          >>>>   Tomorrow is a possibility.
          >>>>   Today is a challenge."
          >>>>
          >>>>
          >>>>
          >>>
          >>>
          >>>
          >>>
          >>>   --
          >>>   Mariano
          >>>   http://marianopeck.wordpress.com
          >>>
          >>
          >
          >   --
          >   www.tudorgirba.com<http://www.tudorgirba.com>
          >
          >   "Beauty is where we see it."
          >
          >
          >
          >
          >
          >
          >
          >

          --
          www.tudorgirba.com<http://www.tudorgirba.com>

          "If you interrupt the barber while he is cutting your hair,
          you will end up with a messy haircut."





      --
      Mariano
      http://marianopeck.wordpress.com






--
Mariano
http://marianopeck.wordpress.com














--
Best regards,
Igor Stasenko AKA sig.

Reply via email to