DTrace

DTrace is a programming language created in 2005.

#399on PLDB	18Years Old	926Users
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DTrace is a comprehensive dynamic tracing framework created by Sun Microsystems for troubleshooting kernel and application problems on production systems in real time. Originally developed for Solaris, it has since been released under the free Common Development and Distribution License (CDDL) and has been ported to several other Unix-like systems. DTrace can be used to get a global overview of a running system, such as the amount of memory, CPU time, filesystem and network resources used by the active processes. Read more on Wikipedia...

DTrace website
DTrace Wikipedia page
There are at least 534 DTrace repos on GitHub
DTrace first developed in Sun Microsystems
file extensions for DTrace include d
The Google BigQuery Public Dataset GitHub snapshot shows 2k users using DTrace in 2k repos on GitHub
GitHub supports syntax highlighting for DTrace
dtrace.org was registered in 2010
See also: (15 related languages)Solaris, FreeBSD, Linux, C, Assembly language, Java, Erlang, JavaScript, Perl, PHP, Python, Ruby, Tcl, MySQL, PostgreSQL
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Example from the web:

# Syscall count by syscall
dtrace -n 'syscall:::entry { @num[probefunc] = count(); }'
# Syscall count by process
dtrace -n 'syscall:::entry { @num[pid,execname] = count(); }'

Example from hello-world:

#!/usr/sbin/dtrace -qs
BEGIN {
	printf("Hello World");
	exit(0);
}

Example from Linguist:

/*
 * This software is in the public domain.
 *
 * $Id: counts.d 10510 2005-08-15 01:46:19Z kateturner $
 */

#pragma D option quiet

self int tottime;
BEGIN {
	tottime = timestamp;
}

php$target:::function-entry
	@counts[copyinstr(arg0)] = count();
}

END {
	printf("Total time: %dus\n", (timestamp - tottime) / 1000);
	printf("# calls by function:\n");
	printa("%-40s %@d\n", @counts);
}

Example from Wikipedia:

# New processes with arguments
dtrace -n 'proc:::exec-success { trace(curpsinfo->pr_psargs); }'

# Files opened by process
dtrace -n 'syscall::open*:entry { printf("%s %s",execname,copyinstr(arg0)); }'

# Syscall count by program
dtrace -n 'syscall:::entry { @num[execname] = count(); }'

# Syscall count by syscall
dtrace -n 'syscall:::entry { @num[probefunc] = count(); }'

# Syscall count by process
dtrace -n 'syscall:::entry { @num[pid,execname] = count(); }'

# Disk size by process
dtrace -n 'io:::start { printf("%d %s %d",pid,execname,args[0]->b_bcount); }'

# Pages paged in by process
dtrace -n 'vminfo:::pgpgin { @pg[execname] = sum(arg0); }'

Feature	Supported	Token	Example
Strings	✓	"	"Hello world"
Comments	✓		/* A comment */
MultiLine Comments	✓	/* */	/* A comment */
Print() Debugging	✓	printf
Semantic Indentation	X

title	author	year	reviews	ratings	rating
Advanced Apple Debugging & Reverse Engineering: Exploring Apple code through LLDB, Python and DTrace	Derek Selander		0	2	5.00
Advanced Apple Debugging & Reverse Engineering Second Edition: Exploring Apple code through LLDB, Python and DTrace	raywenderlich.com Team		0	0	0.0

DTrace - Programming language

Language features

Books about DTrace on goodreads