similar to: How accurate is "ustack"?

I have a clause that look like this: syscall::write:entry /execname == "ntpd" && self->recspec/ { speculate(self->recspec); printf(" fd=%d buf=%d\n%s",arg0,arg2, stringof(copyin(arg1,arg2-1))); } The ntpd program always write a \n trminated string in this context, so I used the "arg2-1" to drop the \n. This works

I''m interested in monitoring the amount of stack used by a multi-threaded program. I assume ''stackdepth'' built-in would be useful...but not sure. Been through demo''s, ToolKit, and internals..but it''s just not clicking for me yet. Not sure how to measure start/end of stack size dynamically...Anyone know how to break this down? This message posted from

Hi, I am fairly new to DTrace, and wanted to ask something regarding synchronization objects. I have a multithreaded C++ program in which I use semaphores (POSIX version) for synchronization. I was interested in using DTrace to figure out the total time for which each thread in my application sleeps, blocked on a semaphore, i.e., as a result of sem_wait() call. In order to measure this, I

I''m pleased to pass along news that the Mac OS X DTrace port has been updated in 10.5.3 to fix the issue that caused timer based probes not to fire in the presence of certain untraceable applications. http://blogs.sun.com/ahl/entry/apple_updates_dtrace A big thank you to the folks at Apple for addressing the problem. Adam -- Adam Leventhal, Fishworks

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

i''m using the following probe to calculate how many bytes are being written by tcp write calls, by process and total: fbt:ip:tcp_output:entry { this->tcpout_size = msgdsize(args[1]); @tcpout_size[execname] = sum(this->tcpout_size); @tcpout_size["TOTAL_TCP_OUT"] = sum(this->tcpout_size); } I run this probe for N seconds. I suppose that if i get the

I have a funny issue whereby when a application exits the proc:::exit probe doesn''t seem to be firing. A customer has written a dtrace script that outputs some info whenever proc:::exit fires but on occasion (random, no pattern in behaviour) dtrace exits without outputting the data. They are running dtrace via ''dtrace -s exit_trace.d -p <pid>'' Can anyone think

I''m trying to install CiscoWorks 2.5 on Solaris 10 update 1, and after the install when I try to start the daemon, it errors: # /opt/CSCOpx/objects/dmgt/dmgtd.sol ERROR: open file dmgtd failedERROR >>>>>>>>>>>>> open msg catalog failed. NLSPATH incorrect or objects/share/nls/C/dmgtd.cat is missing. # echo $NLSPATH

I am trying to integrate John Levon''s ustack() helper for Python into the upstream Python sources. The method for doing this on Solaris is to compile the phelper.d script containing the helper into an object file using "dtrace -G". dtrace on OS X does not have "dtrace -G", just "dtrace -h". This works fine for USDT probes, but I am at a loss on how to

I have a test program which has a call sequence of a(), b(), c(), d(). When I place a pid return probe on d(), I get a ustack that looks like this: a.out`d+0x19 a.out`b+0xd a.out`a+0xd a.out`main+0x3c a.out`_start+0x7a The c() method appears to be missing. I did some poking around and noticed that pid return probes

Howdy, I was playing around with the malloc/free D script provided by Philip Beevers: http://www.opensolaris.org/jive/thread.jspa?threadID=4224&tstart=15 And decided to change the free:entry probe from: pid24169::free:entry / sz[arg0] / { printf("Freeing %p (size %d)\n", arg0, sz[arg0]); sz[arg0] = 0; } to: pid24169::free:entry / ! sz[arg0] / { printf("[ *

Hi all, I am trying to write a D script which would print ustack() for every program in the system receiving SIGSEGV. All the stacks printed in trap()/sigtoproc() context do not have meaningful symbols. The following solves the problem to some degree but I''d much rather have a self-contained D script. dtrace -w -n ''fbt:genunix:sigtoproc:entry/arg2 == 11/ {

As of patch 32953 dtrace support is in bleadperl (5.11.0). The probes are based on Alan Burlinson''s original blog post on the subject: http://blogs.sun.com/alanbur/date/20050909 By guarding the probes with PERL_SUB_*_ENABLED the performance hit is unmeasurable. All the necessary bits already existed in the wild. I just assembled them and made the necessary changes to

I am doing some testing on the adjtime syscall, and I want to dump out the value of the kernel variable "timedelta", and I am failing at it. Some of my attempts got "Module is no longer loaded" and some got "Symbol table entry is not a data object" I found some info that dtrace can print out kernel global variable, so what am I missing here? -- blu "Remember

I am trying to use dtrace to trace all sscanf calls. I am able to use pid provider for this. But my application forks off children at times to handle requests. Is there a way I can stop the child process immediately after it is started so that I can attach a pid provider to that and trace the scanf calls in it? I have tried using the "create" probe but that did not help.

I am running OpenSolaris build 134 on a T1000 (Sparc). It has been an uphill battle getting this far. Many of the commands I find in the various documentation won''t work for me. ------------------------------------------------------------ steve@t1000:~# pfexec pkg install xvm-gui Creating Plan pkg: ''xvm-gui'' matches multiple packages

Hello, The Hotspot JVM Runtime group would like to put forth a project proposal to improve the capabilities of DTrace''s ustack()/jstack() actions to better handle non-standard user stack frames. This email will describe the background, the problem, and our proposed solution. We''re interested in getting a sponsor for this work to help us with the process of getting the

Hello, I updated our main server to 9.2-STABLE today and afterwards I noticed a bunch of these messages, does anyone know what they mean? I was unable to find anything on this error message. Things appear to be working OK so far. Sep 30 22:08:56 illidan kernel: sonewconn: pcb 0xfffffe00c7223498: Listen queue overflow: 193 already in queue awaiting acceptance Sep 30 22:12:27 illidan kernel:

Hi Ryan, > Does anyone happen to know why the ustack() doesn''t show lex, > yak, main > and _start? A quick look with the source browser seems to indicate that _rt_boot is code executed very early in the lifetime of your process by ld.so.1. What seems to be happening is that ld.so.1 has allocated some memory before DTrace got control of your process - long before main() was

I am trying to import a series of text files generated by stimulus presentation software. The problem that I am having is that the number of rows I need to skip is not fixed (depending on subject's pretest behavior) nor is the first row of the data I want always the same (the stimuli were presented in random order). So I need to bring in the .txt file (using readLines?), look for the row