AW: [Discuss-gnuradio] Memory leak when creating several USRP 2objects in C

[Christian Kisters]

Hi Eric

Here some information for you:

C++ Code:
#include <usrp2/usrp2.h>
int main ()
{
        usrp2::usrp2::sptr u2;
        int count = 0;
        while (count++< 3)
        {
                sleep(3);
                u2.reset();
                u2 = usrp2::usrp2::make("eth0","");
        }
        return 0;
}

Memory usage:
first iteration
$ pmap 11770
...
00007f0c6808b000  24412K rw-s-    [ anon ]
...
 total            57280K


second iteration
$ pmap 11770
...
00007f0c660b3000  24412K rw-s-    [ anon ]
...
00007f0c6808b000  24412K rw-s-    [ anon ]
...
 total            81692K

third iteration
$ pmap 11770

...
00007f0c648dc000  24412K rw-s-    [ anon ]
00007f0c660b3000  24412K rw-s-    [ anon ]
...
00007f0c6808b000  24412K rw-s-    [ anon ]
 total           106104K

here you can see that every iteration uses 24412K Byte.


Sample with 23 iterations:
$ pmap 12492
...
00007f4cdcf22000  24412K rw-s-    [ anon ]
00007f4cde6f9000  24412K rw-s-    [ anon ]
00007f4cdfed0000  24412K rw-s-    [ anon ]
00007f4ce16a7000  24412K rw-s-    [ anon ]
00007f4ce2e7e000  24412K rw-s-    [ anon ]
00007f4ce4655000  24412K rw-s-    [ anon ]
00007f4ce5e2c000  24412K rw-s-    [ anon ]
00007f4ce7603000  24412K rw-s-    [ anon ]
00007f4ce8dda000  24412K rw-s-    [ anon ]
00007f4cea5b1000  24412K rw-s-    [ anon ]
00007f4cebd88000  24412K rw-s-    [ anon ]
00007f4ced55f000  24412K rw-s-    [ anon ]
00007f4ceed36000  24412K rw-s-    [ anon ]
00007f4cf050d000  24412K rw-s-    [ anon ]
00007f4cf1ce4000  24412K rw-s-    [ anon ]
00007f4cf34bb000  24412K rw-s-    [ anon ]
00007f4cf4c92000  24412K rw-s-    [ anon ]
00007f4cf6469000  24412K rw-s-    [ anon ]
00007f4cf7c40000  24412K rw-s-    [ anon ]
00007f4cf9417000  24412K rw-s-    [ anon ]
00007f4cfabee000  24412K rw-s-    [ anon ]
00007f4cfc3c5000  24412K rw-s-    [ anon ]
...
00007f4cfe39d000  24412K rw-s-    [ anon ]
...
 total           594344K

an plot of memory usage from 0 to 25 iterations is shown in figure1.png


Hope this information can help you

Best regards
Christian


-----Ursprüngliche Nachricht-----
Von:
address@hidden
[mailto:discuss-gnuradio-bounces+christian.kisters=nts.uni-duisburg-essen.de
@gnu.org] Im Auftrag von Eric Blossom
Gesendet: Freitag, 26. Februar 2010 01:02
An: Christian Kisters
Cc: 'discuss-gnuradio'
Betreff: Re: [Discuss-gnuradio] Memory leak when creating several USRP
2objects in C

On Wed, Feb 24, 2010 at 10:53:49AM +0100, Christian Kisters wrote:
> Hi,
> 
> Like in the old thread '[Discuss-gnuradio] memory leak when creating
several
> usrp2 objects' from 
> 'Jakob Meineke Thu, 30 Jul 2009 09:52:20' 
> http://www.mail-archive.com/address@hidden/msg20403.html 
> the problem with the memory leak still exists.
> 
> 
> The memory usage increases while creating several USRP2s in C.
> 
> usrp2::usrp2::sptr u2;
> for (int i=0;i<20;i++)
> {
>       U2.reset();
>       u2 = usrp2::usrp2::make("eth0","");
> }
> 
> The used memory will be released only by closing the program. So it's
> expected that the memory runs out of its limits.
> 
> Has someone an idea how to fix this problem?
> 
> Best regards
> Chrisitan

Thanks Christian for pointing out the problem.

I'll take a look at this, but it may be a few days.
How much is it leaking per iteration?
How are you determining how much it's leaking?

Thanks!
Eric


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figure1.png
Description: PNG image