who can help me save my memory?

Did your arm have shared obj? The current nios2 did not support shared obj yet.

Another question, how do you take the size of the exec obj?

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originally posted by hippo@Mar 8 2006, 09:15 AM

did your arm have shared obj? the current nios2 did not support shared obj yet.

another question, how do you take the size of the exec obj?

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Hi,hippo!

Thanks for your repsonds, there are no mmu in the both flatforms arm and nios2,

I only use the lib uClibc, I am a begginer, so I don&#39;t know share obj clearly.

I get the memory size of the pppd exec through catting the /proc/meminfo content.

I think the free memory&#39;s difference between before and after the pppd run is the memory size of pppd used.In addition, I find 1.2M excess memory is impropriated

at the begging of ppp building.In other word, the pppd process need almost 2.4Mb memory when they attempt building ppp link with remote. After the ppp link is successful build, the excess 1.2Mb memory will be free

can you tell another better mothod to caculater the memory size of the exec obj clearly?

Thanks a lot.

Did you count in buffer/cache for free memory?

Use "free" command is easier than "cat /proc/meminfo", you should include buffer/cache for free memory.

Hi, hippo.

thank you for your help.I find the size of cache and the buffer isn&#39;t change,the only difference of the memory info before and after pppd run is freemem.the result is same by "cat /proc/meminfo" and using free command.

in addition, I find all the application use more memory than arm.

I am looking forward to you reply, thank you very much

Hi smalllight,

Let try find out what&#39;s the diff in exec, please use xxxxx-flthdr to each of them.

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let try find out what&#39;s the diff in exec, please use xxxxx-flthdr to each of them.[/b]

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What dose "xxxxx-flthdr" meaning? Could you figure out in detail? Thank u in advance.

BTW, what do those flags meanings?

1. elf2flt -s 16000 / elf2flt -s 8192

2. gcc -Wl (Does -W have anymore flags? ) or , pls show us how to find more information about hwo to use gcc ?

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What dose "xxxxx-flthdr" meaning? Could you figure out in detail?[/b]

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the exec format in uclinux is "binary flat" or "flt" in short.

I need to know the headers of the exec, eg pppd, in both platform.

For nios2, xxxx is nios2-linux-uclibc-flthdr (or nios2-elf-flthdr)

For arm, it may be arm-elf-flthdr ?

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1. elf2flt -s 16000 / elf2flt -s 8192[/b]

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nios2-linux-uclibc-elf2flt

or

nios2-elf-elf2flt

will show the usage.

-s set stack size

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2. gcc -Wl (Does -W have anymore flags? ) or , pls show us how to find more information about hwo to use gcc ?[/b]

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Those flags are used pass options to linker.

altera/kits/nios2/documents/gnu-tools

gcc.gnu.org

Hello, Hippo!

I use the XXXX-flthdr in both of the platforms,the display is as follow:

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In nios2 platform:[/b]

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[nios2linux@localhost pppd]$ nios2-elf-flthdr pppd

pppd

Magic: bFLT

Rev: 4

Build Date: Mon Mar 6 17:02:53 2006

Entry: 0x44

Data Start: 0x23c30

Data End: 0x2adf8

BSS End: 0x46d4c

Stack Size: 0x1000

Reloc Start: 0x2adf8

Reloc Count: 0x1130

Flags: 0x1 ( Load-to-Ram )

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In arm platform:[/b]

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[root@localhost pppd]# arm-elf-flthdr pppd

pppd

Magic: bFLT

Rev: 4

Build Date: Tue Jul 20 16:25:09 2004

Entry: 0x50

Data Start: 0x24c60

Data End: 0x2b820

BSS End: 0x359e0

Stack Size: 0x2000

Reloc Start: 0x2b820

Reloc Count: 0xa2e

Flags: 0x1 ( Load-to-Ram )

what do you find? Thanks.

I didi find problems in the flts. Let&#39;s look at detail of memory usage.

Try "cat /proc/(pid of pppd)/maps" for both paltform.

"cat maps" print nothing,the directory /proc/(pppd pid) is as following:

arm platform:

# cat maps# ls -l

-r--r--r-- 1 root 0 0 Mar 13 10:13 mounts

lrwxrwxrwx 1 root 0 0 Mar 13 10:13 exels: ls:./exe: No such

file or directory

lrwxrwxrwx 1 root 0 0 Mar 13 10:13 root -> /

lrwxrwxrwx 1 root 0 0 Mar 13 10:13 cwd -> /

-rw------- 1 root 0 0 Mar 13 10:13 mem

-r--r--r-- 1 root 0 0 Mar 13 10:13 maps

-r--r--r-- 1 root 0 0 Mar 13 10:13 statm

-r--r--r-- 1 root 0 0 Mar 13 10:13 stat

-r--r--r-- 1 root 0 0 Mar 13 10:13 cmdline

-r--r--r-- 1 root 0 0 Mar 13 10:13 status

-r-------- 1 root 0 0 Mar 13 10:13 environ

dr-x------ 2 root 0 0 Mar 13 10:13 fd

nios2 flatform:

# cat maps# ls -l

-r-------- 1 root root 0 Nov 30 00:01 auxv

-r--r--r-- 1 root root 0 Nov 30 00:00 cmdline

lrwxrwxrwx 1 root root 0 Nov 30 00:01 cwd -> /

-r-------- 1 root root 0 Nov 30 00:01 environ

lrwxrwxrwx 1 root root 0 Nov 30 00:01 exels: ./exe: No such f

le or directory

dr-x------ 2 root root 0 Nov 30 00:01 fd

-r--r--r-- 1 root root 0 Nov 30 00:01 maps

-rw------- 1 root root 0 Nov 30 00:01 mem

-r--r--r-- 1 root root 0 Nov 30 00:01 mounts

-rw-r--r-- 1 root root 0 Nov 30 00:01 oom_adj

-r--r--r-- 1 root root 0 Nov 30 00:01 oom_score

lrwxrwxrwx 1 root root 0 Nov 30 00:01 root -> /

-r--r--r-- 1 root root 0 Nov 30 00:00 stat

-r--r--r-- 1 root root 0 Nov 30 00:01 statm

-r--r--r-- 1 root root 0 Nov 30 00:01 status

dr-xr-xr-x 3 root root 0 Nov 30 00:01 task