Displaying 20 results from an estimated 2000 matches similar to: "[DTrace] new iosnoop"
2007 Jun 11
1
2 iosnoop scripts: different results
I am teaching a DTrace class and a student noticed that 2 iosnoop scripts run in two different windows were producing different results. I was not able to answer why this is. Can anyone explain this. Here are the reults from the two windows:
# io.d
...
sched 0 <none> 1024 dad1 W 0.156
bash 1998
2008 Feb 13
1
dtrace: processing aborted: Abort due to systemic unresponsiveness
hello
anyone faced this error before?
dtrace: processing aborted: Abort due to systemic
unresponsiveness
I used iosnoop -evD > iosnoop.log
thanks.
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2006 Apr 07
1
dtrace: invalid probe specifier
Hello,
I''m a newby to dtrace and have just installed the dtrace toolkit v0.92 on
a core soalris 10 1/06 installation on SUN v40z.
I have tried the following commands:
iotop
iosnoop
but I get the message
dtrace: invalid probe specifier
and a lot of code. At the end it says:
: in action list: failed to resolve uid: Unknown variable name
Could it be, that there are some
2014 Sep 17
1
Dtrace of smbd shows some errors in FreeBSD 9.2 with Samba 4.1.11 possibly related to talloc
Opening folders containing 10K files totaling 20GB is slow (takes 1.5 - 2.0
minutes) in FreeBSD 9.2 with Samba 4.1.11 on a system with 32GB RAM and a
newer Xeon processor.
Server is a standalone server that I'm using for testing. I am using nfsv4
acls.
I used the procsystime dtrace script from here:
http://www.brendangregg.com/DTrace/procsystime with the following syntax:
procsystime -n smbd
2006 Jul 20
2
How can I watch IO operations with dtrace on zfs?
I have been using iosoop script (see http://www.opensolaris.org/os/community/dtrace/scripts/) written by Brendan Gregg to look at the IO operations of my application. When I was running my test-program on a UFS filesystem I could see both read and write operations like:
UID PID D BLOCK SIZE COMM PATHNAME
203803 4436 R 6016592 16384 diskio <none>
203803 4436 W 3448432
2007 Jan 10
0
[DTrace] socketsnoop.d - TCP by PID
G''Day Folks,
Well, I had a weekend home in Sydney while inbetween flights and have
knocked out a few programs. (I''ve been programming for 23 hours straight,
so if there is something really dumb in one my scripts then please excuse
me :)
# socketsnoop.d
UID PID DIR SIZE CMD
0 19886 W 64 ssh mars
0 19886 R 80 ssh mars
0 19915 W 0
2005 Nov 18
6
expected system load from DTrace scripts/probes
Does anyone out there have any thoughts on the type of load common
DTrace scripts would cause on a system if run 24x7? I know "common
DTrace scripts" and their underlining probe calls a vague statement. So
for the lack of a common and establish set of scripts in the OS, I''ll
use the most popular right for my question...the DTraceToolkit from
Brendan Gregg. Which by the
2007 Jan 10
0
[DTrace] %CPU, %Mem, %Disk and %Net by PID
G''Day Folks,
Well, this one was my white whale. I now have a demonstration program
that uses Perl, Kstat, /proc/*/usage, /proc/*/psinfo, and DTrace.
The program itself is more of a prototype, I want to get serious about it
and rewrite it in C. It currently has output like,
# prustat -t5 -snet 10
PID %CPU %Mem %Disk %Net COMM
90 0.00 0.09 0.00 0.00
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!).
2005 Sep 08
3
DTrace typewriter
G''Day Folks,
I''ve found another use of dtrace, this makes your console keyboard
sound like a typewriter.
http://www.brendangregg.com/DTrace/typewriter-0.70.tar.gz
I''ve only tested it on an UltraSPARC 5 and a Pentium laptop so far, more
to follow.
Ok, sorry, not actually a practical use of DTrace. :)
Enjoy!
Brendan
[Sydney, Australia]
2007 Oct 17
3
Dtrace scripts for performance data gathering
I am looking for Dtrace scripts that can be used to
collect data during performance tests. I am especially
interested in IO but CPU, memory, threads, etc are needed
as well.
Thanks,
Dave
2005 Nov 29
2
Dtrace - Macros $1, $2, etc...
Unless I am missing something I cannot find a way to do a condtional check and handle it when a dtrace script is written with macros $1, $2 being passed to it, etc...
In other words I have a dtrace script that can have parameters passed to it. Lets say $1 and $2 for example. I am trying to verity that there is or is not a value for $1 or $2 and adjust accordingly.
I am finding that if use macros
2008 Apr 01
10
Request for code review: the brendan() action
This came up as an RFE during the conference (I believe it''s been logged
as "4012008: brendan() action needed for DTrace Toolkit".)
As everyone here is aware, DTrace is not quite as user friendly as it
could be. For the uninitiated, it can be confusing to run a DTrace
script and not see the expected output. Brendan Gregg has addressed
this in the DTrace Toolkit[1] by
2006 Jun 29
3
hotuser and hotkernel
G''Day Folks,
While I have a few minutes online (which is rare at the moment - travel),
let me post about a couple of new scripts. I''ve just uploaded them to
http://www.brendangregg.com/dtrace.html.
They are to profile user-level functions and libaries; and kernel-level
functions and modules. They sample, rather than trace (which can be both
good and bad). Here is hotuser
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
2007 Mar 14
3
I/O bottleneck Root cause identification w Dtrace ?? (controller or IO bus)
Dtrace and Performance Teams,
I have the following IO Performance Specific Questions (and I''m already
savy with the lockstat and pre-dtrace
utilities for performance analysis.. but in need of details regarding
specifying IO bottlenecks @ the controller or IO bus..) :
**Q.A*> Determining IO Saturation bottlenecks ( */.. beyond service
times and kernel contention.. )/
I''m
2008 Feb 28
1
DTrace Toolkit tcpsnoop
I sent this to Brendan but never got a response. Maybe someone else
can help?
-----
Hi Brendan. I''m trying to debug a problem where I need to snoop the
network traffic over a punchin connection, where snoop doesn''t work.
I found your tcpsnoop dtrace tool, which seemed like it might be able
to do what I need. Unfortunately, it doesn''t seem to have an option
to dump
2012 Aug 07
0
coming soon! DTrace Training
(Apologies to anyone who follows me on Twitter and therefore will have seen
this multiple times already.)
Joyent will be offering training in DTrace: Core Features and Performance
Analysis
trainer: Brendan Gregg <http://dtrace.org/blogs/brendan/> (San Francisco,
Sept 6-7), Max Bruning
<http://wiki.smartos.org/display/DOC/Max+Bruning> (Geneva,
Sept 13-14)
This course introduces
2007 Dec 22
3
Erlang DTrace Provider
DTrace folks,
I''m pleased to introduce a potential new DTrace-sponsored project: the
Erlang DTrace provider. To be good OpenSolaris citizens, we want to put
the formation of this officially sponsored project to a vote -- as outlined
in the OpenSolaris Constitution -- so here are the details for the new
Project, as prepared by the Project Team:
Name : Erlang DTrace Integration
2007 Jan 10
0
[DTrace] Loose ends
G''Day Folks,
I''ve rewritten execsnoop, opensnoop and shellsnoop so that they are
wrapped in the Bourne shell to provide command line options (they have
all lost their ".d" extensions, but the old versions are still online).
They are rather more meaningful tools now.
(Eg, I can run shellsnoop with "-qp PID" with the PID of a shell, and see
only the characters