System.OutOfMemoryException

Hi!

I have the following problem on .net 1.1:

I reduced the problem to the following code:

byte[] ByteArrayOk=new byte[17000000];

ByteArrayOk=null;

byte[] ByteArrayOutOfMem=new byte[16773276]; // Exception here!!!

ByteArrayOutOfMem=null;

which throws a System.OutOfMemoryException.

On .net framework 2.0 everything works fine!
But I need a shortterm solution on 1.1!

Thanks for your help!

raise

Carl
Wed Nov 22 10:22:17 CST 2006

raise wrote:
> Hi!
>
> I have the following problem on .net 1.1:
>
> I reduced the problem to the following code:
>
> byte[] ByteArrayOk=new byte[17000000];
>
> ByteArrayOk=null;
>
> byte[] ByteArrayOutOfMem=new byte[16773276]; // Exception here!!!
>
> ByteArrayOutOfMem=null;
>
> which throws a System.OutOfMemoryException.
>
> On .net framework 2.0 everything works fine!
> But I need a shortterm solution on 1.1!

Don't free the first array?

Force a GC collect between releasing the last reference to the first array
and allocating the second array?

-cd

Chris
Wed Nov 22 10:58:10 CST 2006

There is no way to do this and be certain it's going to work.

You're right at the edge of the max memory you can allocate in an x86
process. You may get it to work sometimes by putting a full GC.Collect in
there between allocations, but nothing you do is going to make it work every
time.

It may work sometimes in .Net 2.0 (running on x86), but there are going to
be alot of times that it's not. You're right on the edge there.

Your only real solution is to migrate to .Net 2.0, and run under x64 or
IA64. Nothing else will work reliably.

--
Chris Mullins, MCSD.NET, MCPD:Enterprise
http://www.coversant.net/blogs/cmullins


"raise" <raise@discussions.microsoft.com> wrote in message
news:01E842D0-293F-4B2E-87B1-5980530191D3@microsoft.com...
> Hi!
>
> I have the following problem on .net 1.1:
>
> I reduced the problem to the following code:
>
> byte[] ByteArrayOk=new byte[17000000];
>
> ByteArrayOk=null;
>
> byte[] ByteArrayOutOfMem=new byte[16773276]; // Exception here!!!
>
> ByteArrayOutOfMem=null;
>
> which throws a System.OutOfMemoryException.
>
> On .net framework 2.0 everything works fine!
> But I need a shortterm solution on 1.1!
>
> Thanks for your help!
>
> raise
>

Chris
Wed Nov 22 11:00:54 CST 2006

Ops. I read your number wrong.

You're only allocating 17 megabytes, not 1.7 gigabytes as I assumed.

Do a full GC.Collect first, and if you still have failures, then you're
probably suffering from heap fragmentation. Are you doing any calls out to
Win32? Using Sockets? Files?

--
Chris Mullins


"Chris Mullins" <cmullins@yahoo.com> wrote in message
news:%23uJDldlDHHA.4620@TK2MSFTNGP04.phx.gbl...
> There is no way to do this and be certain it's going to work.
>
> You're right at the edge of the max memory you can allocate in an x86
> process. You may get it to work sometimes by putting a full GC.Collect in
> there between allocations, but nothing you do is going to make it work
> every time.
>
> It may work sometimes in .Net 2.0 (running on x86), but there are going to
> be alot of times that it's not. You're right on the edge there.
>
> Your only real solution is to migrate to .Net 2.0, and run under x64 or
> IA64. Nothing else will work reliably.
>
> --
> Chris Mullins, MCSD.NET, MCPD:Enterprise
> http://www.coversant.net/blogs/cmullins
>
>
> "raise" <raise@discussions.microsoft.com> wrote in message
> news:01E842D0-293F-4B2E-87B1-5980530191D3@microsoft.com...
>> Hi!
>>
>> I have the following problem on .net 1.1:
>>
>> I reduced the problem to the following code:
>>
>> byte[] ByteArrayOk=new byte[17000000];
>>
>> ByteArrayOk=null;
>>
>> byte[] ByteArrayOutOfMem=new byte[16773276]; // Exception here!!!
>>
>> ByteArrayOutOfMem=null;
>>
>> which throws a System.OutOfMemoryException.
>>
>> On .net framework 2.0 everything works fine!
>> But I need a shortterm solution on 1.1!
>>
>> Thanks for your help!
>>
>> raise
>>
>
>