11-15-2011
There are small bits of any shared library which get altered slightly for each program it gets loaded in, to fix code offsets. So it's loaded in 'private' mode, where any changes that get set by your program are kept in RAM specific to that program.
This lets it share all the bits it doesn't change, but keep the bits it does change to itself. It's sort of like copy-on-write.
8 More Discussions You Might Find Interesting
1. UNIX for Advanced & Expert Users
Hello..
I stink at NIS! :)
Im having a problem with NIS on solaris 2.X. / SPARC
I have some maps that are exported to all clients in the domain. Now I setup a new server and add it as a nis client to the domain. On the NIS server there is a auto_direct map that mounts /usr/local . This is... (4 Replies)
Discussion started by: s93366
4 Replies
2. Programming
question: for the below program
i just printed the value for pid, child pid and parent pid
why does it give me 6 values? i assume ppid is 28086
but can't figure out why there are 5 values printed instead of just two!
can someone comment on that!
#include<stdio.h>
#define DIM 8
int... (3 Replies)
Discussion started by: a25khan
3 Replies
3. UNIX for Dummies Questions & Answers
1. If I use an software application(which connects to the database in the server) in my local pc, how many PID should be registered? Would there be PID for the session and another PID for socket connection?
2. I noticed (through netstat) that when I logged in using the my software application,... (1 Reply)
Discussion started by: pcx26
1 Replies
4. Red Hat
hi,
i hav a query abt reading the contents of /proc/pid/maps file.is there any system apis or functions available to get the data from dat file and parse according to my need. i need name of the .so,Create date of the .so file.,Location of .so file etc.
please provide a good source.
yes i hav... (3 Replies)
Discussion started by: sanjaykhuntia
3 Replies
5. UNIX for Dummies Questions & Answers
Hi,
I need to get the pid of a process and have to store the pid in a variable and i want to use this value(pid) of the variable for some process. Please can anyone tell me how to get the pid of a process and store it in a variable. please help me on this.
Thanks in advance,
Amudha (7 Replies)
Discussion started by: samudha
7 Replies
6. UNIX for Dummies Questions & Answers
Hi,
I am trying to calculate the CPU Usage by getting the difference between the idle time reported by /proc/stat at 2 different intervals. Now the 4th entry in the first line of /proc/stat will give me the 'idle time'. But I also came across /proc/uptime that gives me 2 entries : 1st one as the... (0 Replies)
Discussion started by: coderd
0 Replies
7. Shell Programming and Scripting
Hi all,
I'm reading <advanced bash scripting> and there is a example to kill a background process in a limited time,as shown below:
#! /bin/bash
#set -n
TIMEOUT=$1
count=0
hanging_jobs & {
while ((count < TIMEOUT));do
eval ' && ((count = TIMEOUT))'
((count++))
sleep 1... (6 Replies)
Discussion started by: homeboy
6 Replies
8. Shell Programming and Scripting
Hi guys,
i need to write a shell script that will close file descriptors from /proc/pid/fd
will calling exec 4<&- solve the problem ?
thanks in advance :) (15 Replies)
Discussion started by: alpha_romeo
15 Replies
LEARN ABOUT DEBIAN
memstat
MEMSTAT(1) Linux Programmer's Manual MEMSTAT(1)
NAME
memstat - Identify what's using up virtual memory.
SYNOPSIS
memstat [-w][-p PID]
DESCRIPTION
memstat lists all accessible processes, executables, and shared libraries that are using up virtual memory. To get a complete list memstat
has to be run as root to be able to access the data of all running processes.
First, the processes are listed. An amount of memory is shown along with a process ID and the name of the executable which the process is
running. The amount of memory shown does not include shared memory: it only includes memory which is private to that process. So, if a
process is using a shared library like libc, the memory used to hold that library is not included. The memory used to hold the exe-
cutable's text-segment is also not included, since that too is shareable.
After the processes, the shared objects are listed. The amount of memory is shown along with the filename of the shared object, followed
by a list of the processes using the shared object. The memory is listed as the total amount of memory allocated to this object throughout
the whole namespace. In brackets also the amount that is really shared is listed.
Finally, a grand total is shown. Note that this program shows the amount of virtual (not real) memory used by the various items.
memstat gets its input from the /proc filesystem. This must be compiled into your kernel and mounted for memstat to work. The pathnames
shown next to the shared objects are determined by scanning the disk. memstat uses a configuration file, /etc/memstat.conf, to determine
which directories to scan. This file should include all the major bin and lib directories in your system, as well as the /dev directory.
If you run an executable which is not in one of these directories, it will be listed by memstat as ``[0dev]:<inode>''.
Options
The -w switch causes a wide printout: lines are not truncated at 80 columns.
The -p switch causes memstat to only print data gathered from looking at the process with the gicen PID.
NOTES
These reports are intended to help identify programs that are using an excessive amount of memory, and to reduce overall memory waste.
FILES
/etc/memstat.conf
/proc/*/maps
SEE ALSO
ps(1), top(1), free(1), vmstat(8), lsof(8), /usr/share/doc/memstat/memstat-tutorial.txt.gz
BUGS
memstat ignores all devices that just map main memory, though this may cause memstat to ignore some memory usage.
Memory used by the kernel itself is not listed.
AUTHOR
Originally written by Joshua Yelon <jyelon@uiuc.edu> and patched by Bernd Eckenfels <ecki@debian.org>. Taken over and rewritten by Michael
Meskes <meskes@debian.org>.
Debian 01 November 1998 MEMSTAT(1)