Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl: the Markov chain saw
 
PerlMonks  

comment on

( [id://3333]=superdoc: print w/replies, xml ) Need Help??

<sarcasm>Yes, then we could make our programs run faster with:

if( $^O =~ /^MSWin/ ) { $comp= $a lt $b; } else { $comp= $b gt $a; }
</sarcasm>

Please run the benchmarks 5 times with the order in which the different tests are run changed each time (prepend different letters to each case as Benchmark.pm runs them in order sorted by name). Then you can try to interpet the numbers. It wouldn't surprise me if the optimizer removed those operations anyway and you are just timing a bunch of loops.

It is quite normal for the exact same operation to benchmark 5% or even more different each time you try. This is especially true of tiny things like what you are trying to benchmark.

It just so happens that these are also the types of things that you don't want to optimize.

Comparing the speed of lt, gt, ge, le, ne, and eq is just, well, silly. The difference comes down to a fraction of a machine language instruction. The time it takes to dispatch a single Perl opcode dwarfs that like a flea on an aircraft carrier.

Some of the other comparisons might be interesting if the benchmarking code and results were shown to be actually doing a comparison. But I want to stress that this is not the type of stuff you should even think about when trying to make your code run faster.

Okay, I feel slightly better. Now back to our regularly schedule trolling^Wdownvoting^Wscholarly discussions. (:

        - tye (but my friends call me "Tye")

In reply to (tye)Re: Benchmarking the basic operations by tye
in thread Benchmarking the basic operations by Falkkin

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or How to display code and escape characters are good places to start.
Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Chatterbox?
and the web crawler heard nothing...

How do I use this?Last hourOther CB clients
Other Users?
Others contemplating the Monastery: (6)
As of 2024-03-28 10:21 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found