memory reported under linux higher that allocated?
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@metnet.navy.mil
> To: fedora-list@redhat.com
> 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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