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Old April 5th, 2012, 16:39
martintangsl martintangsl is offline
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Default FreeBSD's DTrace needs specific settings?
I'm learning and evaluating DTrace.

DTrace on FreeBSD seems to be a bit different from other platforms.

# dtrace -n 'syscall:::'
gives the message
Code:
dtrace: failed to initialize dtrace: DTrace device not available on system
Other platforms tested show a list of system calls.

Does DTrace need some specific settings on FreeBSD? My platform is FreeBSD 9.0 x86 running inside VirtualBox.
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Old April 5th, 2012, 17:01
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Dtrace needs to be specifically enabled.

Handbook: 26.3 Enabling DTrace Support
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Old April 7th, 2012, 06:37
martintangsl martintangsl is offline
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Thanks. Still some problems in using DTrace. Some probes does not work and running them several times would cause the virtual machine restarts.
sudo dtrace -n 'pid$target:a.out:ntry' -c ./a.out gives
Code:
dtrace: description 'pid$target:a.out::entry' matched 5 probes
dtrace: buffer size lowered to 6m
dtrace: pid 1150 has exited
I followed the wiki page here, created and wrote /etc/make.conf, compiled and installed the world. Still restarting.
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Old August 12th, 2012, 15:23
tthtlc tthtlc is offline
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After FreeBSD9 installation, I got the same error too. Then I did "kldload dtrace" and "kldload dtraceall" and surprisingly, no error, which means that default it is not loaded. These kernel modules are residing in /boot/kernel - so go there and make sure it exists. If yes, then just kldload the module, and it should work.
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