probing my ssd's latency
reddit / BSD

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kyleW_ne · 2022-04-29 13:40

This is a really cool article.  Stupid question but I am new to
OpenBSD, is dt the same dt as in Dtrace used in FreeBSD and Solaris /
Illumos?

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brynet · 2022-04-29 21:34

No, it's not DTrace, it's OpenBSD's own dynamic kernel tracer, the
userland utility btrace(8) is instead compatible with Linux's BPFtrace
scripts.

https://man.openbsd.org/bt.5

https://man.openbsd.org/btrace.8

Example bt(5) scripts: https://cvsweb.openbsd.org/cgi-
bin/cvsweb/src/share/btrace/

You can also use Brandan Gregg's scripts produce flamegraphs, etc.

https://github.com/brendangregg/FlameGraph

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kyleW_ne · 2022-04-30 00:15

Thanks Brynet, you always seem to answer all my questions!
Also, this makes sense because DTrace is copy left license under the
CDDL and I know OpenBSD prefers ISC or BSD licensed stuff.  Someone
should update the DTrace Wikipedia article because it has an OpenBSD
mention.