You're probably losing most of the time on the actual output. Each call to printf costs the time of a process spawn. And the file has to be opened, written, and closed on each call.
The below Perl script creates the permutations (same number of records as in your example) in just over 2 minutes on an average sized laptop ---------- Post updated at 15:46 ---------- Previous update was at 15:38 ----------
Addendum: on the very same setup, the script as you have given it managed to produce ~50% of all combinations in about 17 minutes. There has to be something entirely different wrong with your setup for it to take 70 hours.
Hello all,
I just stuck up in an uncertain situation related to network performance...
I am trying to access one of my remote client unix machine from a distant location..
The client machine is Ultra-5_10 , with SunOS 5.5.1
The ndd result ( hme1 )shows that the machine is hooked to a... (5 Replies)
We have a AIX v5.3 on a p5 system with a poor performing Ingres database.
We added one CPU to the system to see if this would help. Now there are two CPU's.
with sar and topas -P I see good results: CPU usage around 30%
with topas I only see good results in the process output screen, the... (1 Reply)
Hi,
on a linux server I have the following :
vmstat 2 10
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
0 4 0 675236 39836 206060 1617660 3 3 3 6 8 7 1 1 ... (1 Reply)
In my C program i am using very large file(approx 400MB) to read parts of it frequently. But due to large file the performance of the program goes down very badly. It shows very high I/O usage and I/O wait time.
My question is, What are the ways to optimize or tune I/O on linux or how i can get... (10 Replies)
Hi Gurus,
I am beginner in solaris and want to know what are the things we need to check for performance monitoring on our solairs OS.
for DISK,CPU and MEMORY.
Also how we do ipforwarding in slaris
Many thanks for your help
Pradeep P (4 Replies)
Hi All,
I have the following script which I use in Nagios to check the health of the applications, the problem with it is that the curl part ($TOTAL) does not return anything after running for 2-3 hrs, even though from command line the script runs fine but not from Nagios.
There are 17... (1 Reply)
Hi,
We have 2 lpars on p6 blade. One of the lpar is having 3 core cpu with 5gb memory running sybase as database. An EOD process takes 25 min. to complete.
Now we have an lpar on P7 server with entitled cpu capacity of 2 with 16 Gb memory and sybase as database. The EOD process which takes... (17 Replies)
Hi
We have an AIX5.3 server with application which is written in C. We are facing server (lpar) hangs intermediately. If we open new telnet window prompts for user and takes hell of a time to authenticate, not only that if we run ps -aef then also it takes lot of time. surprisingly there is no... (2 Replies)
IN solaris, for network high-availability we are using IPMP concept, can u tell me in REDHAT LINUX what we are using... also pls share good step to read & understand the that concept...
Also performance issue in linux what are step & cmd can u tell me??? (2 Replies)
Discussion started by: tiger09
2 Replies
LEARN ABOUT LINUX
pam_issue
PAM_ISSUE(8) Linux-PAM Manual PAM_ISSUE(8)NAME
pam_issue - PAM module to add issue file to user prompt
SYNOPSIS
pam_issue.so [noesc] [issue=issue-file-name]
DESCRIPTION
pam_issue is a PAM module to prepend an issue file to the username prompt. It also by default parses escape codes in the issue file similar
to some common getty's (using x format).
Recognized escapes:
d
current day
l
name of this tty
m
machine architecture (uname -m)
machine's network node hostname (uname -n)
o
domain name of this system
release number of operating system (uname -r)
current time
s
operating system name (uname -s)
u
number of users currently logged in
U
same as u except it is suffixed with "user" or "users" (eg. "1 user" or "10 users")
v
operating system version and build date (uname -v)
OPTIONS
noesc
Turns off escape code parsing.
issue=issue-file-name
The file to output if not using the default.
MODULE TYPES PROVIDED
Only the auth module type is provided.
RETURN VALUES
PAM_BUF_ERR
Memory buffer error.
PAM_IGNORE
The prompt was already changed.
PAM_SERVICE_ERR
A service module error occurred.
PAM_SUCCESS
The new prompt was set successfully.
EXAMPLES
Add the following line to /etc/pam.d/login to set the user specific issue at login:
auth optional pam_issue.so issue=/etc/issue
SEE ALSO pam.conf(5), pam.d(5), pam(7)AUTHOR
pam_issue was written by Ben Collins <bcollins@debian.org>.
Linux-PAM Manual 06/04/2011 PAM_ISSUE(8)