RE : database paging memory leak
Øyvind Roa (oyvind.roa++at++ks-t.no)
Fri, 20 Nov 1998 12:57:39 +0100
> Hello Mark,
>
> We have been struggling with the same problems here at our site.
> The problem is usually due to memory fragmentation, and Performers
> ability to reuse it. Performer is optimized for speed, and sometimes
> is not very good at reusing memory.
>
> Our problem was reduced a lot when I included the following lines
> at the beginning of the program :
>
> #include <malloc.h>
>
> amallopt(M_FREEHD, 1, pfGetSharedArena()) ;
> amallopt(M_MXCHK, 10000, pfGetSharedArena()) ;
>
>
> You can monitor the memoryusage with the code :
>
> struct mallinfo info ;
>
> info = amallinfo(pfGetSharedArena()) ;
> printf("amallinfo : Arena size : %d\n", info.arena) ;
> printf("amallinfo : Ordinary blocks : %d\n", info.ordblks) ;
> printf("amallinfo : Small blocks : %d\n", info.smblks) ;
> printf("amallinfo : Holding block headers : %d\n", info.hblkhd) ;
> printf("amallinfo : Holding blocks : %d\n", info.hblks) ;
> printf("amallinfo : Small blocks in use : %d\n", info.usmblks) ;
> printf("amallinfo : Free small blocks : %d\n", info.fsmblks) ;
> printf("amallinfo : Ordinary blocks in use : %d\n", info.uordblks) ;
> printf("amallinfo : Free ordinary blocks : %d\n", info.fordblks) ;
>
> You will probably see that the amount of "Free ordinary blocks" increases
> as you start paging.
>
> Regards,
> Oyvind Roa
>
>
> ----------------------------------------------------------------
> Oyvind Roa
> Senior Software Engineer
>
> Kongsberg Defence & Aerospace A/S, Simulation & Training
> Box 1003, N-3601 Kongsberg
> NORWAY
>
> E-maill : oyvind.roa++at++kongsberg.com
> ----------------------------------------------------------------
>
>
>
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on Fri Nov 20 1998 - 03:59:58 PST