Can someone point me at resources for system calls? Specifically, I am trying to make sense of what I am seeing in a truss command. Thanks! (3 Replies)
Hi all,
I'm doing automation task for my team and I just started to learn unix scripting so please shed some light on how to do this:
1) I have 2 sets of datafiles - datafile A and B. These datafiles must be loaded subsequently and cannot be loaded concurrently.
2) So I loaded datafile A... (10 Replies)
Hi All,
We a critical application running on the Sun Solaris platform. But, for some reasons the process get's killed abnormally in the production environment and not sure what was causing this. I thought i would use the truss command to trace the errors.. so i used the bellow command
truss... (5 Replies)
Hi All,
I have to kill a program whose pid, i will be getting.
Multiple processes will be getting started by my script of same kind in a series.
So for after each call to a process i need to write a command or script which can kill the process if it takes more than 5min. In this i will... (3 Replies)
We are having a bit of trouble finding where the following process is being started from at bootup.
/opt/IBM/tdsV6.2db2/itma/aix526/ud/bin/kuddb2 db2tdsWe have looked in the typical areas /etc/inittab & /etc/rc.d but have had no luck finding it, any ideas? (10 Replies)
Hi, i want that the parent process start before the child, this code doesn't work,
if the child start before the parent it wait for signal, then the father send the signal SIGALRM and the child catch it and call printf;
else the father call printf and send the signal to the child that call its... (1 Reply)
Howdy,
I'm fairly new at bash scripting, but (for some reason) I've been tasked with building a bastion server and logging all (ssh/telnet) remote activity. Each session must create a unique log file - the name of each file must include the user ID, the connection method (ssh/telnet), the name... (2 Replies)
This is on a CentOS box, I have two scripts that need to run in order.
I want to write a shell script that calls the first script, lets it run and then terminates it after a certain number of hours (that I specify of course), and then calls the second script (they can't run simultaneously) which... (3 Replies)
I am writing a script to kick off a process to gather logs on multiple nodes in parallel using "&". These processes create individual log files. Which I would like to filter and convert in CSV format after they are complete. I am facing following issues:
1. Monitor all Processes parallelly.... (5 Replies)
Discussion started by: shunya
5 Replies
LEARN ABOUT OSX
dtruss
dtruss(1m) USER COMMANDS dtruss(1m)NAME
dtruss - process syscall details. Uses DTrace.
SYNOPSIS
dtruss [-acdeflhoLs] [-t syscall] { -p PID | -n name | command }
DESCRIPTION
dtruss prints details on process system calls. It is like a DTrace version of truss, and has been designed to be less intrusive than truss.
Of particular interest is the elapsed times and on cpu times, which can identify both system calls that are slow to complete, and those
which are consuming CPU cycles.
Since this uses DTrace, only users with root privileges can run this command.
OPTIONS -a print all details
-b bufsize
dynamic variable buffer size. Increase this if you notice dynamic variable drop errors. The default is "4m" for 4 megabytes per CPU.
-c print system call counts
-d print relative timestamps, us
-e print elapsed times, us
-f follow children as they are forked
-l force printing of pid/lwpid per line
-L don't print pid/lwpid per line
-n name
examine processes with this name
-o print on-cpu times, us
-s print stack backtraces
-p PID examine this PID
-t syscall
examine this syscall only
EXAMPLES
run and examine the "df -h" command
# dtruss df -h
examine PID 1871
# dtruss -p 1871
examine all processes called "tar"
# dtruss -n tar
run test.sh and follow children
# dtruss -f test.sh
run the "date" command and print elapsed and on cpu times,
# dtruss -eo date
FIELDS
PID/LWPID
Process ID / Lightweight Process ID
RELATIVE
relative timestamps to the start of the thread, us (microseconds)
ELAPSD elapsed time for this system call, us
CPU on-cpu time for this system call, us
SYSCALL(args)
system call name, with arguments (some may be evaluated)
DOCUMENTATION
See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with ver-
bose descriptions explaining the output.
EXIT
dtruss will run forever until Ctrl-C is hit, or if a command was executed dtruss will finish when the command ends.
AUTHOR
Brendan Gregg [Sydney, Australia]
SEE ALSO procsystime(1M), dtrace(1M), truss(1)version 0.80 Jun 17, 2005 dtruss(1m)