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Full Discussion: Overhead of using a shared library
Top Forums UNIX for Dummies Questions & Answers Overhead of using a shared library Post 302424728 by Dongping84 on Wednesday 26th of May 2010 07:08:16 AM
Old 05-26-2010
The OS is ubuntu 9.10 and Linux kernel is Linux ubuntu 2.6.31-17-generic. The compiler I'm using is gcc version 4.4.1, the linker is GNU ld (GNU Binutils for Ubuntu) 2.20`and the dynamic loader is ld-2.10.1.so. I did not use lazy loading. The source codes are very simple.
The source code of executable is foo.c, it only calls bar1 of the shared library.
Code:
void main(){
       bar1();
       sleep(100);
}

The shared library only contains one object file (bar.o). The source code of bar.c is shown below. The reason I wrote so many functions was that I wanted to make the hash table and symbol table extremely large, because I thought that before any functions were called, these two tables should be loaded in the physical memory.
Code:
void bar1(){}
void bar2(){}
void bar3(){}
...
void bar20000(){}

The commands I used to compile and link are:
Code:
gcc -c bar.c
gcc -shared bar.o -o libnewshared.so
gcc -c foo.c
gcc foo.o ./libnewshared.so -o text

If you need any other information, please tell me. Thanks in advance!
 

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LEARN ABOUT DEBIAN

import-bug-from-debian

import-bug-from-debian(1)				      General Commands Manual					 import-bug-from-debian(1)

NAME

       import-bug-from-debian - Import bugs from Debian's BTS, and file them against Ubuntu in LP.

SYNOPSIS

       import-bug-from-debian [options] bug...
       import-bug-from-debian -h

DESCRIPTION

       import-bug-from-debian  clones  bugs  from Debian's BTS into Launchpad. Each bug listed on the command line has its initial report re-filed
       against the same source package in Ubuntu.  The Ubuntu bug is linked back to its Debian counterpart.

       Each bug may be provided either as a bug number or URL.

OPTIONS

       -b, --browserless
	      Don't open the bug in a browser at the end.

       -h, --help
	      Display a help message and exit.

       -l INSTANCE, --lpinstance=INSTANCE
	      Use the specified instance of Launchpad (e.g. "staging"), instead of the default of "production".

       -p PACKAGE, --package=PACKAGE
	      Launchpad package to file bug against, if not the same source package name as Debian.   Useful  for  importing  removal  bugs  filed
	      against ftp.debian.org.

       --no-conf
	      Do not read any configuration files, or configuration from environment variables.

ENVIRONMENT

       All  of	the  CONFIGURATION  VARIABLES  below are also supported as environment variables.  Variables in the environment take precedence to
       those in configuration files.

CONFIGURATION VARIABLES

       The following variables can be set in the environment or in ubuntu-dev-tools(5) configuration files.  In  each  case,  the  script-specific
       variable takes precedence over the package-wide variable.

       IMPORT_BUG_FROM_DEBIAN_LPINSTANCE, UBUNTUTOOLS_LPINSTANCE
	      The default value for --lpinstance.

SEE ALSO

       ubuntu-dev-tools(5)

AUTHORS

       import-bug-from-debian  was  written  by  James	Westby <james.westby@ubuntu.com>, and this manual page was written by Stefano Rivera <ste-
       fanor@ubuntu.com>.

       Both are released under the terms of the GNU General Public License, version 2.

ubuntu-dev-tools						 September 21 2010					 import-bug-from-debian(1)
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