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Core Development Tools/Discussion/General/Question about showmem/List of Posts
Forum Topic - Question about showmem: (3 Items)
   
Update
Alan Strader
11/20/2008 5:37 PM
post17017
Question about showmem   
I needed to monitor the use of our RAM in our QNX implementation since
we are about to reach the ceiling.  I have used pidin, sin, and now
showmem.  Showmem provides all the information I need for the process as
well as the threads but in all the tools I am shown more memory than
what I have (for example): 

 

# showmem -S

System RAM:       32M (      33554432)

Total Used:       38M (      40099840)

 Used Private:    34M (      36630528)

 Used Shared:   3388K (       3469312)

 

Actually in this instance Momentics is only reporting that 27M is being
used.  I have also gathered all the individual process memory in the
Momentics Memory Information in the System Information View but I was
looking for a quicker, easier, and more exact indicator of RAM usage.  I
understand about shared memory but I was wondering what is the best tool
to use (and how to use it) or how can I look more closely at the number
that I already have and get a better picture.

 

Thanks for any help.

 

Alan
Hans-Peter Reichert
11/21/2008 2:29 AM
post17034
AW: Question about showmem   
welcome in showmems' world ...
what exactly do you want to track?
-only current free mem?
-total mem consumption on a per process basis?
-only heap consumption of processes?
...

/hp


>-----Ursprüngliche Nachricht-----
>Von: Alan Strader [mailto:community-noreply@qnx.com] 
>Gesendet: Donnerstag, 20. November 2008 23:38
>An: general-toolchain
>Betreff: Question about showmem
>
>I needed to monitor the use of our RAM in our QNX 
>implementation since we are about to reach the ceiling.  I 
>have used pidin, sin, and now showmem.  Showmem provides all 
>the information I need for the process as well as the threads 
>but in all the tools I am shown more memory than what I have 
>(for example): 
>
> 
>
># showmem -S
>
>System RAM:       32M (      33554432)
>
>Total Used:       38M (      40099840)
>
> Used Private:    34M (      36630528)
>
> Used Shared:   3388K (       3469312)
>
> 
>
>Actually in this instance Momentics is only reporting that 27M 
>is being used.  I have also gathered all the individual 
>process memory in the Momentics Memory Information in the 
>System Information View but I was looking for a quicker, 
>easier, and more exact indicator of RAM usage.  I understand 
>about shared memory but I was wondering what is the best tool 
>to use (and how to use it) or how can I look more closely at 
>the number that I already have and get a better picture.
>
> 
>
>Thanks for any help.
>
> 
>
>Alan
>
> 
>
>
>
>_______________________________________________
>General
>http://community.qnx.com/sf/go/post17017
>
> 
 
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Alan Strader
11/21/2008 2:54 PM
post17094
Re: AW: Question about showmem   
   I have been tracking the total RAM memory usage on a per process basis.  This gives me the heavy users so I can go 
back to software leads to possibly get the biggest reduction of memory usage up front.  All the tools (pidin, sin, and 
showmem) that I have been using gives me the same 8 processes to concentrate on.
   What I really would like to do is understand the numbers better that I am seeing with the tools.  Momentics is 
reporting that I have 27MB of RAM used yet the commnad line tools are not showing me the same numbers.  They are showing
 me numbers much much higher.  I have a Perl script tool that parses the output of pidin so I can look at the ROM and 
RAM estimates.  It calculates the data and the shared memory of each process accordingly by correctly grouping the Code,
 Data, and Stack (also looking at the overlapping of the shared memory).  I have even individually copied the individual
 process memory amounts in Momentics to compare against.

A

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