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Questions tagged [dtrace]

DTrace is a comprehensive dynamic tracing framework for the Solaris Operating Environment.

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1 vote
1 answer
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Why does timestamp increase after a call to chill() but vtimestamp and walltimestamp do not?

I'd like to understand why calling chill() in a DTrace action block increases the timestamp variable, but not vtimestamp and walltimestamp. Here's an example showing timestamp increasing after a call ...
Mateusz Piotrowski's user avatar
2 votes
1 answer
43 views

How to convert an int to a string in DTrace?

I'd like to be able to concatenate a string and an int using strjoin(), e.g., strjoin("ada", args[1]->unit_number); but in order to do that I have to make sure that the int is first ...
Mateusz Piotrowski's user avatar
2 votes
1 answer
143 views

How to trace and print out all files that are accessed / used when bash starts?

I'm having a problem and need to print out to the console all files that are being access each time bash is executed on macOS. Is there a relatively easy method for doing this? Perhaps dtrace might ...
ylluminate's user avatar
2 votes
0 answers
544 views

Tools to debug slow NFS on OSX

I have 2 mac pros connected to a Nexenta NAS. They have a fast network connection, the same ping time, and the routes to the server are the same (both are plugged into the same switch). One computer ...
Dan's user avatar
  • 9,502
1 vote
1 answer
71 views

Modifying standard DTT scripts to use -c instead of $1

There are lots of great dtrace programs out there and some of them require a PID to be passed to them, in order for them to trace that PID. Inside the dtrace scripts that argument is stored in $1. Is ...
Junaid Shahid's user avatar
2 votes
0 answers
112 views

osx dtruss doesn't report opening ~/.bash_profile while tracing bash?

Let's assume I have this line at the start of my ~/.bash_profile: echo "*** THIS IS ~/.bash_profile RUNNING ***" On a Linux machine (Ubuntu 14.04), I can inspect which files bash loads at startup ...
sdaau's user avatar
  • 6,798
3 votes
0 answers
202 views

Unix OSX invisible process, how do I identify further information?

Using execsnoop -v, I note a dtrace error for two processes. ID3 (ID 630) and ID2 (ID 360). ~ 03:59 am ∆:ps -p 260 PID TTY TIME CMD 260 ?? 0:02.36 /usr/libexec/UserEventAgent (Aqua) ...
Cam_Aust's user avatar
  • 131
2 votes
1 answer
75 views

How to measure changes to the filesystem done by a certain application? [closed]

I am using a command line application which creates a great amount of intermediate artifacts to the file system and then at some point deletes them. On environments where storage space is constrained ...
carlossless's user avatar
13 votes
1 answer
7k views

Error on enabled probe: syscall::open_nocancel:entry): invalid user access in action #2 at DIF

I've the following one-liner to show files opened by process: sudo dtrace -n 'syscall::open*:entry { printf("%s %s",execname,copyinstr(arg0)); }' however I've plenty of repeated errors such ...
kenorb's user avatar
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6 votes
1 answer
1k views

Finding the source of CoW page faults on OS X

I'm trying to find the source of CoW page faults in some C code on OS X. I would like to use the vminfo DTrace provider, but vminfo isn't available on OS X. On Linux, I can use SystemTap to print a ...
Aaron Patterson's user avatar
0 votes
1 answer
76 views

Uprobes Status on the present linux kernel

I know uprobes was introduced on kernel 3.5 has it survived or is it dropped, is it still available on kernel 4.x
SAS's user avatar
  • 31
7 votes
2 answers
9k views

Measure disk IO latencies of a running process

I'm trying to measure the disk IO latencies of a running process to make a histogram. I could do this with DTrace in operating systems that provide it (e.g. as in this Joyent paper), but my ...
ajduff574's user avatar
  • 233
4 votes
1 answer
710 views

Are there awk versions that provide syntax for computing aggregations?

From time to time I find myself writing awk scripts that compute some simple statistics. For example computing a histogram, the average of a value, the standard deviation or even the variance ... ...
maxschlepzig's user avatar
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3 votes
2 answers
954 views

Java process, swap (/proc Solaris10) memory highly utilized

How can I analyze high swap memory utilization of Solaris 10 for Java processes?
Vishal's user avatar
  • 131
6 votes
1 answer
685 views

DTrace to trap any chmod applied to certain files

Underneath the Mac OS X directory /audit I have certain files which users can access and chmod to their liking. I need to audit any chmod done on any files by recording the time, user and file being ...
Robottinosino's user avatar