Displaying 20 results from an estimated 10000 matches similar to: "query on syscall"
2006 Sep 06
3
Dtrace Snooping
Dear dtrace Experts,
I have seen some dtrace utilities like opensnoop and execsnoop etc.
My interest is to write a simple script that can snoop the files which
uses the 3 syscalls like open,create,unlink.
I have gone through dtrace oneliners that can do the same :
dtrace -n ''syscall::open*:entry { printf("%s %s",execname,copyinstr(arg0));}''
dtrace -n
2008 Sep 30
12
dtrace missing ''unlinkat''? showing process stack?
everyone,
Just out of curiosity, I did a
dtrace -n ''syscall:::entry { @num[execname, probefunc] = count(); }''
and looked at the entries produced by ''rm''.
I see everything that rm did, *except* the unlinkat - which is unfortunate because I want to trace which processes have deleted which files.
So - does dtrace contain unlinkat as a probe for a system call?
2005 Sep 11
8
DTrace vs truss
G''Day Folks,
I''ve finally typed up my classic DTrace demo, which I use to introduce
people to DTrace (I delivered this at SOSUG#1),
http://www.brendangregg.com/DTrace/dtracevstruss.html
Here I create a fault and show the difficulty in analysing it using
previous tools. Then I compare the impact of analysing the problem
using both DTrace and truss. DTrace wins (a lot!).
2008 Jan 30
2
Truning on pid$target probes hangs Solaris
Hi:
I''m running Indiana (OpenSolaris developer preview) under parallels
in OS X 10.5.1. I can consistently get Solaris to hang.
Doing a
dtrace -n pid\$target::malloc:entry''{@=count()}'' -c ls
will consistently hang Solaris.
Basically doing anything with PID provider with the
-c option seems to hangs Solaris. Only way to recover
is to stop and start Parallels desktop.
2006 Oct 30
3
Why does gethostbyname_r appear to leak?
I am running a very simple multithreaded program (TestThread.C) which calls gethostbyname_r in several threads. My analysis of this program with both truss and DTrace suggest that is has a small leak. However, if I alter the program to have many more threads and run for a lot longer it never runs out of memory and does not carry on growing. Can anybody explain what I am missing in my analysis or
2007 Jul 30
3
dtrace
hi fnds,
i want to print the filenames on which the stat system
call is acting when a stat system call is invoked. can anyone can help
me this regard.
Thanks
jeevan
2005 Oct 11
7
dtrace: failed to initialize dtrace: DTrace device not available on system
I have a number of systems running solaris10 and i see the package and binary for dtrace installed however whenever we try to run anything we get this error
dtrace: failed to initialize dtrace: DTrace device not available on system
the only system in which i dont have this error is the development server that has the full solaris 10 install while others are minimized, do i need additional
2005 Dec 30
5
Dtrace locks up on sol
Hi all...
I''ve just got my hands on a Solaris 10 box for the first time. I''ve heard wonderous things about dtrace, so the first command I type is dtrace -l which disappointingly does nothing at all. It just hangs, and neither Ctrl-D, Ctrl-C or kill -9 from another shell will do anything to kill it.
The box is:
SunOS t2000 5.10 Generic_118822-25 sun4v sparc SUNW,Sun-Fire-T200
2006 Oct 13
3
error running webserver 7 with the DTrace dvm agents...
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=ISO-8859-1">
<title></title>
</head>
<body text="#330000" bgcolor="#ffffff">
<tt><font size="+1">I am attempting to run the sun webserver 7
2008 Apr 20
1
dtrace script to monitor file access
A user has asked us to find out who is changing one of their files and how it is being changed. I came up
with the script below:
#!/usr/sbin/dtrace -s
#pragma D option quiet
BEGIN
{
printf("\n Timestamp gid uid pid ppid execname function current directory file name\n\n");
}
syscall::open:entry,
2001 Nov 22
2
Add new user -> swat core dump
Hi there,
I have a problem when I try to create a new user with swat. I use binaries of
Samba 2.2.2 coming from www.samba.org, or from www.sunfreeware.com
on Solaris 2.6 and on 8. I compiled the sources and the result is the same.
When I click on "Add New User" (Server Password Management), I receive
a nearly blank page: I can only see the samba gif on top and the user is not
2010 Mar 30
7
Analyzing java class loading with dtrace
Hi there,
I am trying to diagnose a performance problem on a Sun T5120 running
Solaris 10. I see general poor performance using Java and, in
particular, loading classes. I have developed a simple java test that
loads all of the classes in a Crystal Reports JAR file (around 7000
classes) which takes much longer on the T5120 (40 secs) than on a Core
2 Duo windows PC (5 secs). I recognise that this
2009 Feb 12
9
df -k takes too long only at random times
How do I find out why df -k is taking soo long to respond only sometimes?
--
Asif Iqbal
PGP Key: 0xE62693C5 KeyServer: pgp.mit.edu
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
2009 Feb 18
4
tracing aio syscalls
Hi all,
Is there some documentation or some example on how to interpret the arg0
.. arg<n> for the aioread, aiowrite, aiowait syscalls? The system call
name for all three seems to be "kaio".
Michael
=== Michael Mueller ==================
Tel. + 49 8171 63600
Fax. + 49 8171 63615
Web: http://www.michael-mueller-it.de
======================================
2005 Nov 09
1
Where & Why is my process sleeping a lot?
I have a program where the process seems to be sleeping a lot (waiting
on something)
What would be the right approach to figure out via dtrace where it is
sleeping and why it is sleeping?
In my current process, using truss -D shows that it reaches pollsys and
the whole process sleeps for 1.5 - 1.8 seconds before it awakes again.
Its the only significant process running on this two CPU
2007 Jan 23
1
dovecotpw/sql crypt scheme core dump with rc17-19
Platform is Solaris 8 on a 280R.
I'm setting up a new installation of Dovecot, and I ran into some troubles
that I've partly tracked down.
I setup auth/user dbs with LDAP initially, and things worked well.
Passwords are stored as "{crypt}zxcv..." in LDAP.
I setup SQL, and began getting this:
dovecot: Jan 23 16:37:47 Error: child 8718 (auth-worker) killed with signal 11
2008 May 21
9
Slow pkginstalls due to long door_calls to nscd
Hi all,
I am installing a zone onto two different V445s running S10U4 and the
zones are taking hours to install (about 1000 packages), that is, the
problem is identical on both systems. A bit of trussing and dtracing has
shown that the pkginstalls being run by the zoneadm install are making
door_call calls to nscd that are taking very long, so far observed to be
5 to 40 seconds, but always in
2013 Nov 08
1
[PATCH 2/3] syscalls: Add syscalls needed by arm64
On 11/08/2013 09:12 AM, Steve Capper wrote:
> diff --git a/usr/klibc/open64.c b/usr/klibc/open64.c
> new file mode 100644
> index 0000000..6ca603e
> --- /dev/null
> +++ b/usr/klibc/open64.c
> @@ -0,0 +1,22 @@
> +/*
> + * open64.c
> + *
> + * For 64 bit systems without the open syscall, pass straight
> + * through into openat.
> + */
> +
> +#define
2006 Mar 01
3
vtimestamp skew, after restorectx()
Hello,
I''m using the below dtrace script to capture the flow and times of
kernel functions, from an ioctl() call. After an entry into
restorectx(), the trace of startimestamp - vtimestamp makes a dramatic
jump downwards. Here''s the snippet showing the jump...
6 -> di_checkmem 8 220176600
6 <- di_checkmem
2006 Apr 10
2
Control-c
why do I need to use Control-c to stop my trace, for example:
#dtrace -n ''profile:::tick-1sec/++x == 10/ {exit(0)}''
in my system with heavy IO load, I have to use Control-c
without heavy IO, the same trace cmd just return automatically after 10 sec.
I just assume Control-c is to deliver a signal to dtrace, but why do I have to in some cases (like I have a heavy IO load)?