[dtrace-discuss] FW: Memory Leak Problem in My Application running on Solaris 10.

[James C. McPherson]

Sana, Srikant wrote:
> 
> 
> Hi,
> 
>  This is regarding Dtrace usability for memory leak detection.
> 
>  We have real-time application written C++ which runs on Solaris 10  
>   having a problem that's the my application  grows in size from 130 Mb
> to 450Mb in around 15 days.
> 
>  So there is two possibilities with the application growth of memory 
>  due to Size growth of Dictionary Objects (Like Maps) and Memory Leak.
> 
>  (Dictionary Objects we can print the size but its live production 
>  site where the problem is happening also there are many such object 
>  used the application)
> 
>  When I used  Dtrace and libumem ( with mdb )to detect memory leak for
> C++ code. 
> 
>  When I tried to run dtrace script available in SUN Site it stops
> abruptly
>  With following error
> 
>  # dtrace -s ./CCagg_1.d `pgrep scadadbproc` | c++filt >>
>  scadadbproc_dtrace
>  dtrace: 91102 drops on CPU 0
>  dtrace: processing aborted: Abort due to systemic unresponsiveness

Where is this D script found? What is it trying to look at?

>  While suing mdb ( ::findleaks ) 
>   It says no memory allocation done and says no leaks found.

Did you run ::findleaks on a crash dump or a live system?

> 1) Is there any way where I can restrict dtrace to look for probe only
> certain source files or functions?

Not so sure about source files, but yes to functions. Eg, if I want
to search for calls to open(2), then I'd use

pid$target::open:


> 2) Is there any way to handle such problems?

Yes, but we need more info from you in order to help you.

> 3) I got a clue of using "libgc.so" which acts as garbage collector is 
>    there any problem in using and how reliable and effective is this.
>    ( it works fine on sample application but not improvement in real
> application ) . I just linked the library "libgc.so" at compile time ?
> Anything else need to done for this ?

Can't answer this one, sorry, but have you read the article
http://developers.sun.com/solaris/articles/libgc.html


James C. McPherson
--
Senior Kernel Software Engineer, Solaris
Sun Microsystems
http://blogs.sun.com/jmcp	http://www.jmcp.homeunix.com/blog