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aix memory usage - difference with other unix flavors

Hi all,
I am testing (memory consumption) a C++  application across different
platforms (aix windows solaris linux).

I found interesting/confusing results.
I configured application on all platforms equally, i.e. it holds same
amount of information in memory across all platforms.

I found large difference in memory consumption between the pltforms.

To hold X amount of information

aix - process's total mem footprint (SZ + RSS of ps command):
90920+89064 (175 MB)
solaris - process's total mem footprint (SZ + RSS of ps command):
4266+31176 (34 MB)

It is very huge difference across platforms.
Is it due to way OS handles memory management or diff STL
implemenataions.?

0
11/10/2005 6:20:49 AM
comp.unix.aix 10963 articles. 1 followers. drkirkby (98) is leader. Post Follow

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pankaj-startup wrote:
> Hi all,
> I am testing (memory consumption) a C++  application across different
> platforms (aix windows solaris linux).
> 
> I found interesting/confusing results.
> I configured application on all platforms equally, i.e. it holds same
> amount of information in memory across all platforms.
> 
> I found large difference in memory consumption between the pltforms.
> 
> To hold X amount of information
> 
> aix - process's total mem footprint (SZ + RSS of ps command):
> 90920+89064 (175 MB)
> solaris - process's total mem footprint (SZ + RSS of ps command):
> 4266+31176 (34 MB)
> 
> It is very huge difference across platforms.
> Is it due to way OS handles memory management or diff STL
> implemenataions.?
> 

It's hard to compare this way.
"SZ+RSS" for sure are calculated (very) differently on different *nix.

Even if same amount of the virtual memory are used on each platform,
different amount of physical memory can be used due to page stealer,
paging activity, sharing policy etc.

To have better idea how memory is used for your application:
on Solaris, check "pmap -ax <PID>";
on AIX, check "svmon -P <PID>" and "procmap <PID>".

Hope it helps.

Tao

0
nameistao (52)
11/10/2005 4:33:40 PM
pankaj-startup wrote:
> Hi all,
> I am testing (memory consumption) a C++  application across different
> platforms (aix windows solaris linux).
> 
> I found interesting/confusing results.
> I configured application on all platforms equally, i.e. it holds same
> amount of information in memory across all platforms.
> 
> I found large difference in memory consumption between the pltforms.
> 
> To hold X amount of information
> 
> aix - process's total mem footprint (SZ + RSS of ps command):
> 90920+89064 (175 MB)
> solaris - process's total mem footprint (SZ + RSS of ps command):
> 4266+31176 (34 MB)
> 
> It is very huge difference across platforms.
> Is it due to way OS handles memory management or diff STL
> implemenataions.?
> 

Google "memory-mapped file aix" and read the results.
0
nobody4 (271)
11/11/2005 1:12:07 AM
Reply:

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