Questions tagged [dtrace]
DTrace is a comprehensive dynamic tracing framework for the Solaris Operating Environment.
15
questions
1
vote
1
answer
35
views
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 ...
- 4,773
2
votes
1
answer
41
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 ...
- 4,773
2
votes
1
answer
137
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 ...
- 111
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 ...
- 56.8k
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 ...
- 56.8k
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 ...
- 56.8k
2
votes
0
answers
543
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 ...
- 9,492
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 ...
- 6,778
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)
...
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 ...
- 2,146
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 ...
CommunityBot
- 1
0
votes
1
answer
74
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
- 21k
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 ...
- 189
4
votes
1
answer
709
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 ...
...
CommunityBot
- 1
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?
- 2,994