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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