Re: [info-performer] amallinfo and getArenaBytesUsed

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From: Yair Kurzion (yair++at++polygon.engr.sgi.com)
Date: 07/08/2002 16:59:49

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In reply to: Andreas Ekstrand: "[info-performer] amallinfo and getArenaBytesUsed"

Hello Andreas !

> I have a simple question:
>
> What is the difference between calling amallinfo using usmblks +
> uordblks) and pfMemory::getArenaBytesUsed? Should they report the same
> allocated shared memory size?

getArenaBytesUsed reports the number of bytes currently allocated by pfMalloc
(ignoring the bytes freed by pfFree). It is computed internally in libpf.

amallinfo is an IRIX system call (I doesn't exist on Linux). I am not sure
exactly what (usmblks + uordblks) return. I don't know whether fragmented
memory grows this sum or not. I use getArenaBytesUsed to track memory leaks
because it completely ignores fragmentation.

-yair

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