<div>Hi Michael,</div><div><br></div><div>Better, but still ~2 seconds:</div><div><br></div><div><span style="font-family:UICTFontTextStyleBody;font-size:17px">> timer:tc(fun() -> filelib:fold_files("/usr/share", ".*", true, fun(F, N) -> N + 1 end, 0) end).</span><br style="font-family:UICTFontTextStyleBody;font-size:17px"><span style="font-family:UICTFontTextStyleBody;font-size:17px">{<a href="tel:1993074,28953" dir="ltr">1993074,28953</a>}</span></div><div><font face="UICTFontTextStyleBody"><span style="font-size:17px"><br></span></font></div><div><font face="UICTFontTextStyleBody"><span style="font-size:17px">If I get it correctly the call matches only on files, not on dirs.</span></font></div><div><font face="UICTFontTextStyleBody"><span style="font-size:17px"><br></span></font></div><div><font face="UICTFontTextStyleBody"><span style="font-size:17px">/Frank</span></font></div><div><font face="UICTFontTextStyleBody"><span style="font-size:17px"><br></span></font><div class="gmail_quote"><div>Le sam. 10 déc. 2016 à 03:12, Michael Truog <<a href="mailto:mjtruog@gmail.com">mjtruog@gmail.com</a>> a écrit :<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div text="#000000" bgcolor="#FFFFFF" class="gmail_msg"><br><br>    <div class="m_4764755269035584299moz-cite-prefix gmail_msg">On 12/09/2016 03:15 PM, Frank Muller<br><br>      wrote:<br class="gmail_msg"><br><br>    </div><br><br>    <blockquote type="cite" class="gmail_msg"><br><br>      <div style="font-family:UICTFontTextStyleBody;font-size:17px" class="gmail_msg"><br><br>        <div class="gmail_msg">Hi</div><br><br>        <div class="gmail_msg"><br class="gmail_msg"><br><br>        </div><br><br>        <div class="gmail_msg">I would like to improve the speed of my directory<br><br>          walker.</div><br><br>        <div class="gmail_msg"><br class="gmail_msg"><br><br>        </div><br><br>        <div class="gmail_msg">walk(Dir) -></div><br><br>        <div class="gmail_msg">    {ok, Files} = prim_<a class="m_4764755269035584299moz-txt-link-freetext gmail_msg">file:list_dir(Dir)</a>,</div><br><br>        <div class="gmail_msg">    walk(Dir, Files).</div><br><br>        <div class="gmail_msg"><br class="gmail_msg"><br><br>        </div><br><br>        <div class="gmail_msg">walk(Dir, [ Basename | Rest ]) -></div><br><br>        <div class="gmail_msg">    Path = filename:join([ Dir, Basename ]),</div><br><br>        <div class="gmail_msg">    case filelib:is_dir(Path) of</div><br><br>        <div class="gmail_msg">        true  -></div><br><br>        <div class="gmail_msg">            walk(Path);</div><br><br>        <div class="gmail_msg">        false -></div><br><br>        <div class="gmail_msg">            io:format("~s~n", [Path]),</div><br><br>        <div class="gmail_msg">            filelib:file_size(Path)</div><br><br>        <div class="gmail_msg">    end,</div><br><br>        <div class="gmail_msg">    walk(Dir, Rest);</div><br><br>        <div class="gmail_msg">walk(_, []) -></div><br><br>        <div class="gmail_msg">    ok.</div><br><br>      </div><br><br>      <div style="font-family:UICTFontTextStyleBody;font-size:17px" class="gmail_msg"><br class="gmail_msg"><br><br>      </div><br><br>      <div style="font-family:UICTFontTextStyleBody;font-size:17px" class="gmail_msg"><br class="gmail_msg"><br><br>      </div><br><br>      <div style="font-family:UICTFontTextStyleBody;font-size:17px" class="gmail_msg">Compared<br><br>        to almost anything i found on the web, it’s still very slow:</div><br><br>      <div style="font-family:UICTFontTextStyleBody;font-size:17px" class="gmail_msg"><br><br>        <div class="gmail_msg">> timer:tc(fun() -> dir:walk("/usr/share")<br><br>          end).</div><br><br>      </div><br><br>      <div style="font-family:UICTFontTextStyleBody;font-size:17px" class="gmail_msg">{<a href="tel:4662361" class="gmail_msg" target="_blank">4662361</a>,ok}</div><br><br>    </blockquote><br><br>    <br class="gmail_msg"></div><div text="#000000" bgcolor="#FFFFFF" class="gmail_msg"><br><br>    Have you tried filelib:fold_files/5<br><br>    (<a class="m_4764755269035584299moz-txt-link-freetext gmail_msg" href="http://erlang.org/doc/man/filelib.html#fold_files-5" target="_blank">http://erlang.org/doc/man/filelib.html#fold_files-5</a>) ?<br class="gmail_msg"><br><br>    <br class="gmail_msg"><br><br>  </div><br><br><br><br></blockquote></div></div>