RE: memory reported under linux higher that allocated?

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My app start at 761k X 2 because a have an extra thread and my app is waiting to receive a command from another tcpip program that contrôle it. So I know when it start allocate memory to start doing what the app must do because a must send a command to start it.
 
I used ps -el | grep myapp to see the program size, the "top" utility reported 0%.
 
I just added 4 more gig to my AMD 6400 computer, so it's using 8gig of RAM now.
 
now, when I ran my app, after it allocated 3gig of RAM, "top" reported that my app used 40.5% of memory, it's suppose to be 37.5% so there is an extra 240 meg I dont know from where it come from.
 
ps -el reported that the parent thread is 809k in size and the child thread that do all the malloc is 828394k in size, It doesn't seem logic!
 
any idea.
 
----- when my app is currently allocating memory (see below)-----
[trembb@cons15 ~]$ cat /proc/meminfo | more
MemTotal:      8168496 kB
MemFree:       4319256 kB
Buffers:         18132 kB
Cached:         344564 kB
SwapCached:          0 kB
Active:        3613836 kB
Inactive:       138524 kB
SwapTotal:     2031608 kB
SwapFree:      2031608 kB
Dirty:               0 kB
Writeback:           0 kB
AnonPages:     3389672 kB
Mapped:          29108 kB
Slab:            32848 kB
SReclaimable:    12200 kB
SUnreclaim:      20648 kB
PageTables:      14228 kB
NFS_Unstable:        0 kB
Bounce:              0 kB
CommitLimit:   6115856 kB
Committed_AS:  3532976 kB
VmallocTotal: 34359738367 kB
VmallocUsed:     41884 kB
VmallocChunk: 34359693623 kB
HugePages_Total:     0
HugePages_Free:      0
HugePages_Rsvd:      0
Hugepagesize:     2048 kB
-----
----- When my app as terminated so no more memory is used (see below)-----
[trembb@cons15 ~]$ cat /proc/meminfo | more
MemTotal:      8168496 kB
MemFree:       7635816 kB
Buffers:         18152 kB
Cached:         344644 kB
SwapCached:          0 kB
Active:         303196 kB
Inactive:       138552 kB
SwapTotal:     2031608 kB
SwapFree:      2031608 kB
Dirty:               4 kB
Writeback:           0 kB
AnonPages:       79092 kB
Mapped:          27848 kB
Slab:            32844 kB
SReclaimable:    12200 kB
SUnreclaim:      20644 kB
PageTables:       7712 kB
NFS_Unstable:        0 kB
Bounce:              0 kB
CommitLimit:   6115856 kB
Committed_AS:   222308 kB
VmallocTotal: 34359738367 kB
VmallocUsed:     41884 kB
VmallocChunk: 34359693623 kB
HugePages_Total:     0
HugePages_Free:      0
HugePages_Rsvd:      0
Hugepagesize:     2048 kB
-----
 
thanks for your help!
 
Benoit

> Date: Thu, 14 Feb 2008 14:30:59 -0800
> From: john.wendel@xxxxxxxxxxxxxxx
> To: fedora-list@xxxxxxxxxx
> Subject: Re: memory reported under linux higher that allocated?
>
> Benoit Tremblay wrote:
> > Hi,
> >
> > I have 4 gig of RAM and when I allocate 3 gig the <top> utilities show
> > that my application is using 87% of the available RAM, so it's a half a
> > gig more, why? The application is not doing any disk access.
> >
> > I just do a couple of malloc and the same amount of free at exit. I
> > count all malloc by incrementing a "m" variable and I decrement the same
> > "m" variable when doing free and at the program exit I display the value
> > of "m" and it is zero. I stop doing malloc when my "m" variable reach 3
> > gigabytes so I am sure I allocate only 3 gigabytes so why my application
> > is using 87% of all available RAM?
> >
> > Benoit
> >
>
> What is the "available" RAM before your app starts? It is less than 4
> GB, since there is a lot of other stuff running in addition to your app.
>
> How much memory is you app using that isn't part of the malloc request?
>
> John
>
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