Beefy Boxes and Bandwidth Generously Provided by pair Networks
"be consistent"

Comment on

( #3333=superdoc: print w/replies, xml ) Need Help??

The remaining difference in speed is most likely due to strlen of "foo" being recomputed every time in the inner loop (i.e. the zero in newSVpv(foo, 0) ).

Precomputing it once (as Perl can do too, because the "foo" in "foo" x $n_cols is by definition fix) — i.e.

SV *make_aoa_c( int n_rows, int n_cols ) { int i, j; char *foo = "foo"; AV *table = newAV(); AV *row; int len = strlen(foo); av_extend(table, n_rows-1); for ( i = 0; i < n_rows; ++i ) { row = newAV(); av_extend(row, n_cols-1); for ( j = 0; j < n_cols; ++j ) { av_push( row, newSVpv( foo, len ) ); // or newSVpvn(...) } av_push( table, newRV_noinc( row ) ); } return newRV_noinc( table ); }

makes any XS vs. Perl speed difference go away (or at least statistically insignificant).

(Without this optimisation I did observe a small, but consistent difference — approx. 5% on average.)

In reply to Re^3: Inline::C's AoA is much bigger than Perl's by almut
in thread Inline::C's AoA is much bigger than Perl's by tlm

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

  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?

    What's my password?
    Create A New User
    and all is quiet...

    How do I use this? | Other CB clients
    Other Users?
    Others chanting in the Monastery: (8)
    As of 2018-05-22 08:49 GMT
    Find Nodes?
      Voting Booth?