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Examples
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/usr/sbin/dtrace - x evaltime = exec - n "$dtrace" & 2
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A D program can be executed by specifying it via the '- s' switch to dtrace or making it an executable (like a shell script) and setting 'dtrace' as the interpreter, by
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A D program can be executed by specifying it via the '- s' switch to dtrace or making it an executable (like a shell script) and setting 'dtrace' as the interpreter, by
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A D program can be executed by specifying it via the '- s' switch to dtrace or making it an executable (like a shell script) and setting 'dtrace' as the interpreter, by
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But am thinking with the fine grained profiling capability — even on a live production server (with no impact on production performance) — that dtrace might be something that would give you the specifics you need to diagnose current issues — and monitor things on an ongoing basis, too.
8 Way Dual Core opterons with 128GB/ram. « The Paradigm Shift 2006
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You can actually write pretty sophisticated programs for dtrace using D language.
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Let's run dtrace in the truss (1) like fashion to answer this question (inspired by Brendan Gregg's dtruss utility):
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Note: As the name suggests, the dtrace (Dynamic Trace) utility will show you the information about a chnaging process - in dynamic.
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However, the real power of dtrace comes from the fact that you can do things with it that won't be possible without writing a comprehensive C program.
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The whole 'syscall:: open: entry' construction is called a 'probe' and defines a location or activity to which dtrace binds a request to perform a set of 'actions'.
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