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PROGRAM:
NAME
nytprofhtml - Generate reports from Devel::NYTProf data
SYNOPSIS
Typical usage:
$ perl -d:NYTProf some_perl_app.pl
$ nytprofhtml --open
Options synopsis:
$ nytprofhtml [-h] [-d] [-m] [-o <output directory>] [-f <input file>] [--open]
DESCRIPTION
Devel::NYTProf is a powerful feature-rich Perl source code profiler. See Devel::NYTProf
for details.
"nytprofhtml" generates a set of html reports from a single data file generated by
Devel::NYTProf. (If your process forks you'll probably have multiple files. See
Devel::NYTProf and nytprofmerge.)
The reports include dynamic runtime analysis wherein each line and each file is analyzed
based on the performance of the other lines and files. As a result, you can quickly find
the slowest module and the slowest line in a module. Slowness is measured in three ways:
total calls, total time, and average time per call.
Coloring is based on absolute deviations from the median. See
<http://en.wikipedia.org/wiki/Median_absolute_deviation> for more details.
That might sound complicated, but in reality you can just run the command and enjoy your
report!
COMMAND-LINE OPTIONS
-f, --file <filename>
Specifies the location of the file generated by Devel::NYTProf. Default:
./nytprof.out
-o, --out <dir>
The directory in which to place the generated report files. Default: ./nytprof/
-d, --delete
Purge any existing contents of the report output directory.
-l, --lib <dir>
Add a path to the beginning of @INC to help nytprofhtml find the source files used by
the code. Should not be needed in practice.
--open
Make your web browser visit the report after it has been generated.
If this doesn't work well for you, try installing the Browser::Open module.
-m, --minimal
Don't generate graphviz .dot files or block/sub-level reports.
--no-flame
Disable generation of the flamegraph on the index page. Also disables calculation of
distinct call stacks that are used to produce the flamegraph.
-h, --help
Print the help message.
SAMPLE OUTPUT
You can see a complete report for a large application (over 200 files and 2000
subroutines) at
<https://www.me.com/ix/tim.bunce/Public/perl/nytprof/nytprof-perlcritic-demo/index.html>
The report was generated by profiling perlcritic 1.106 checking its own source code using
perl 5.12.1.
DIAGNOSTICS
"Unable to open '... (autosplit into ...)'"
The profiled application executed code in a module that used AutoLoader to load the code
from a separate .al file. NYTProf automatically recognises this situation and tries to
determine the 'parent' module file so it can associate the profile data with it. In order
to do that the parent module file must already be 'known' to NYTProf, typically by already
having some code profiled.
You're only likely to see this warning if you're using the "start" option to start
profiling after compile-time. The effect is that times spent in autoloaded subs won't be
associated with the parent module file and you won't get annotated reports for them.
You can avoid this by using the default "start=begin" option, or by ensuring you execute
some non-autoloaded code in the parent module, while the profiler is running, before an
autoloaded sub is called.
HISTORY
A bit of history and a shameless plug...
NYTProf stands for 'New York Times Profiler'. Indeed, this module was initially developed
from Devel::FastProf by The New York Times Co. to help our developers quickly identify
bottlenecks in large Perl applications. The NY Times loves Perl and we hope the community
will benefit from our work as much as we have from theirs.
Please visit <http://open.nytimes.com>, our open source blog to see what we are up to,
<http://code.nytimes.com> to see some of our open projects and then check out
<http://nytimes.com> for the latest news!
Background
Subroutine-level profilers:
Devel::DProf | 1995-10-31 | ILYAZ
Devel::AutoProfiler | 2002-04-07 | GSLONDON
Devel::Profiler | 2002-05-20 | SAMTREGAR
Devel::Profile | 2003-04-13 | JAW
Devel::DProfLB | 2006-05-11 | JAW
Devel::WxProf | 2008-04-14 | MKUTTER
Statement-level profilers:
Devel::SmallProf | 1997-07-30 | ASHTED
Devel::FastProf | 2005-09-20 | SALVA
Devel::NYTProf | 2008-03-04 | AKAPLAN
Devel::Profit | 2008-05-19 | LBROCARD
Devel::NYTProf is a (now distant) fork of Devel::FastProf, which was itself an evolution
of Devel::SmallProf.
Adam Kaplan took Devel::FastProf and added html report generation (based on Devel::Cover)
and a test suite - a tricky thing to do for a profiler. Meanwhile Tim Bunce had been
extending Devel::FastProf to add novel per-sub and per-block timing, plus subroutine
caller tracking.
When Devel::NYTProf was released Tim switched to working on Devel::NYTProf because the
html report would be a good way to show the extra profile data, and the test suite made
development much easier and safer.
Then he went a little crazy and added a slew of new features, in addition to per-sub and
per-block timing and subroutine caller tracking. These included the 'opcode interception'
method of profiling, ultra-fast and robust inclusive subroutine timing, doubling
performance, plus major changes to html reporting to display all the extra profile call
and timing data in richly annotated and cross-linked reports.
Steve Peters came on board along the way with patches for portability and to keep NYTProf
working with the latest development Perl versions.
Adam's work is sponsored by The New York Times Co. <http://open.nytimes.com>. Tim's work
was partly sponsored by Shopzilla. <http://www.shopzilla.com>.
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