Memory Utilization of Uninitialized data structures in code

Hi,

 

I generated the elf files for the libnetsnmp.a, libnetsnmpmibs.a,
libnetsnmpagent.a, libnetsnmphelpers.a and later when I try to find the
memory map of the unitialized data structures,

I found few bunch of information.

 

The three main offenders according to me are:

 

disks = 0x19190 (102k) bytes defined in mibgroups\ucd-snmp\disk.c.  It's
an array of size MAXDISKS which is defined in
...\net-snmp-5.1.1\include\net-snmp\net-snmp-config.h 

 

tclist = 0x18000 (98k) bytes defined in net-snmp-5.1.1\snmplibs\parse.c.
It's an array of size MAXTC [4096]  which is defined in the same file. 

 

fileTable = 0x140A0 (82k) bytes defined in
agent\mibgroup\ucd-snmp\file.c.  It's an array of size MAXFILE [20]
which is defined in the same file.

 

What is the significance of allocating such huge memory to these
variables?

Is there a way that by minimizing the "numbers" in #defines for these
macros, we can reduce the size of a statically linked executable???

Would there be a impact which is not quite evident at this stage if the
above values are changed?

 

Regards,

Sri.

 

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