Questions tagged [dtrace]

Question 1

I've come across the following DTrace one-liner on https://wiki.freebsd.org/DTrace/One-Liners: # Summarize TCP life span in seconds: dtrace -n 'fbt::tcp_close:entry { @["TCP life span (...

Question 2

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 ...

Question 3

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 ...

Question 4

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 ...

Question 5

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 ...

Question 6

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 ...

Question 7

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 ...

Question 8

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) ...

Question 9

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 ...

Question 10

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 ...

Question 11

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 ...

Question 12

I know uprobes was introduced on kernel 3.5 has it survived or is it dropped, is it still available on kernel 4.x

Question 13

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 ...

Question 14

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 ... ...

Question 15

How can I analyze high swap memory utilization of Solaris 10 for Java processes?

Stack Exchange Network

Questions tagged [dtrace]

DTrace cannot reference the external kernel variable `ticks` on FreeBSD

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

How to convert an int to a string in DTrace?

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

Tools to debug slow NFS on OSX

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

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

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

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

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

Finding the source of CoW page faults on OS X

Uprobes Status on the present linux kernel

Measure disk IO latencies of a running process

Are there awk versions that provide syntax for computing aggregations?

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

Hot Network Questions