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perl.pod
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perl5004delta.pod
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perlaix.pod
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perlpolicy.pod
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Code Editor : perldtrace.pod
=head1 NAME perldtrace - Perl's support for DTrace =head1 SYNOPSIS # dtrace -Zn 'perl::sub-entry, perl::sub-return { trace(copyinstr(arg0)) }' dtrace: description 'perl::sub-entry, perl::sub-return ' matched 10 probes # perl -E 'sub outer { inner(@_) } sub inner { say shift } outer("hello")' hello (dtrace output) CPU ID FUNCTION:NAME 0 75915 Perl_pp_entersub:sub-entry BEGIN 0 75915 Perl_pp_entersub:sub-entry import 0 75922 Perl_pp_leavesub:sub-return import 0 75922 Perl_pp_leavesub:sub-return BEGIN 0 75915 Perl_pp_entersub:sub-entry outer 0 75915 Perl_pp_entersub:sub-entry inner 0 75922 Perl_pp_leavesub:sub-return inner 0 75922 Perl_pp_leavesub:sub-return outer =head1 DESCRIPTION DTrace is a framework for comprehensive system- and application-level tracing. Perl is a DTrace I<provider>, meaning it exposes several I<probes> for instrumentation. You can use these in conjunction with kernel-level probes, as well as probes from other providers such as MySQL, in order to diagnose software defects, or even just your application's bottlenecks. Perl must be compiled with the C<-Dusedtrace> option in order to make use of the provided probes. While DTrace aims to have no overhead when its instrumentation is not active, Perl's support itself cannot uphold that guarantee, so it is built without DTrace probes under most systems. One notable exception is that Mac OS X ships a F</usr/bin/perl> with DTrace support enabled. =head1 HISTORY =over 4 =item 5.10.1 Perl's initial DTrace support was added, providing C<sub-entry> and C<sub-return> probes. =item 5.14.0 The C<sub-entry> and C<sub-return> probes gain a fourth argument: the package name of the function. =item 5.16.0 The C<phase-change> probe was added. =back =head1 PROBES =over 4 =item sub-entry(SUBNAME, FILE, LINE, PACKAGE) Traces the entry of any subroutine. Note that all of the variables refer to the subroutine that is being invoked; there is currently no way to get ahold of any information about the subroutine's I<caller> from a DTrace action. :*perl*::sub-entry { printf("%s::%s entered at %s line %d\n", copyinstr(arg3), copyinstr(arg0), copyinstr(arg1), arg0); } =item sub-return(SUBNAME, FILE, LINE, PACKAGE) Traces the exit of any subroutine. Note that all of the variables refer to the subroutine that is returning; there is currently no way to get ahold of any information about the subroutine's I<caller> from a DTrace action. :*perl*::sub-return { printf("%s::%s returned at %s line %d\n", copyinstr(arg3), copyinstr(arg0), copyinstr(arg1), arg0); } =item phase-change(NEWPHASE, OLDPHASE) Traces changes to Perl's interpreter state. You can internalize this as tracing changes to Perl's C<${^GLOBAL_PHASE}> variable, especially since the values for C<NEWPHASE> and C<OLDPHASE> are the strings that C<${^GLOBAL_PHASE}> reports. :*perl*::phase-change { printf("Phase changed from %s to %s\n", copyinstr(arg1), copyinstr(arg0)); } =back =head1 EXAMPLES =over 4 =item Most frequently called functions # dtrace -qZn 'sub-entry { @[strjoin(strjoin(copyinstr(arg3),"::"),copyinstr(arg0))] = count() } END {trunc(@, 10)}' Class::MOP::Attribute::slots 400 Try::Tiny::catch 411 Try::Tiny::try 411 Class::MOP::Instance::inline_slot_access 451 Class::MOP::Class::Immutable::Trait:::around 472 Class::MOP::Mixin::AttributeCore::has_initializer 496 Class::MOP::Method::Wrapped::__ANON__ 544 Class::MOP::Package::_package_stash 737 Class::MOP::Class::initialize 1128 Class::MOP::get_metaclass_by_name 1204 =item Trace function calls # dtrace -qFZn 'sub-entry, sub-return { trace(copyinstr(arg0)) }' 0 -> Perl_pp_entersub BEGIN 0 <- Perl_pp_leavesub BEGIN 0 -> Perl_pp_entersub BEGIN 0 -> Perl_pp_entersub import 0 <- Perl_pp_leavesub import 0 <- Perl_pp_leavesub BEGIN 0 -> Perl_pp_entersub BEGIN 0 -> Perl_pp_entersub dress 0 <- Perl_pp_leavesub dress 0 -> Perl_pp_entersub dirty 0 <- Perl_pp_leavesub dirty 0 -> Perl_pp_entersub whiten 0 <- Perl_pp_leavesub whiten 0 <- Perl_dounwind BEGIN =item Function calls during interpreter cleanup # dtrace -Zn 'phase-change /copyinstr(arg0) == "END"/ { self->ending = 1 } sub-entry /self->ending/ { trace(copyinstr(arg0)) }' CPU ID FUNCTION:NAME 1 77214 Perl_pp_entersub:sub-entry END 1 77214 Perl_pp_entersub:sub-entry END 1 77214 Perl_pp_entersub:sub-entry cleanup 1 77214 Perl_pp_entersub:sub-entry _force_writable 1 77214 Perl_pp_entersub:sub-entry _force_writable =item System calls at compile time # dtrace -qZn 'phase-change /copyinstr(arg0) == "START"/ { self->interesting = 1 } phase-change /copyinstr(arg0) == "RUN"/ { self->interesting = 0 } syscall::: /self->interesting/ { @[probefunc] = count() } END { trunc(@, 3) }' lseek 310 read 374 stat64 1056 =back =head1 REFERENCES =over 4 =item DTrace User Guide L<http://download.oracle.com/docs/cd/E19082-01/819-3620/index.html> =item DTrace: Dynamic Tracing in Oracle Solaris, Mac OS X and FreeBSD L<http://www.amazon.com/DTrace-Dynamic-Tracing-Solaris-FreeBSD/dp/0132091518/> =back =head1 AUTHORS Shawn M Moore C<sartak@gmail.com> =cut
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