From grdetil@scrc.umanitoba.ca Tue Jan 5 17:32:46 1999 Date: Tue, 5 Jan 1999 17:33:56 -0600 (CST) From: Gilles Detillieux To: Geoff Hutchison Cc: leizaola@unitedmta.com, grdetil@scrc.umanitoba.ca Subject: Re: htdig: 3.1.b2 -> 3.1.b3 performance degradation + According to Geoff Hutchison: > > > On Thu, 24 Dec 1998, Maren S. Leizaola wrote: > > > Just for my information if I set the back_link factor to 0 will > > the disk I/O speed up? > > No. We're working on a patch that will do this. Here's a patch to 3.1.0b4 to do this. You have to set backlink_factor and date_factor to 0. By default, date_factor is already 0, but backlink_factor isn't. --- htsearch/Display.cc.backlink Tue Dec 22 20:15:39 1998 +++ htsearch/Display.cc Tue Jan 5 17:18:44 1999 @@ -800,6 +800,8 @@ String url; ResultMatch *thisMatch; List *matches = new List(); + double backlink_factor = config.Double("backlink_factor"); + double date_factor = config.Double("date_factor"); results->Start_Get(); while ((id = results->Get_Next())) @@ -833,7 +835,6 @@ // DocMatch *dm = results->find(id); double score = dm->score; - DocumentRef *thisRef = docDB[thisMatch->getURL()]; // We need to scale based on date relevance and backlinks // Other changes to the score can happen now @@ -843,19 +844,23 @@ // We want older docs to have smaller values and the // ultimate values to be a reasonable size (max about 100) - if (thisRef) // We better hope it's not null! + if (date_factor != 0.0 || backlink_factor != 0.0) + { + DocumentRef *thisRef = docDB[thisMatch->getURL()]; + if (thisRef) // We better hope it's not null! { - score += config.Double("date_factor") * + score += date_factor * ((thisRef->DocTime() * 1000 / (double)time(0)) - 900); int links = thisRef->DocLinks(); if (links == 0) links = 1; // It's a hack, but it helps... - score += config.Double("backlink_factor") + score += backlink_factor * (thisRef->DocBackLinks() / (double)links); } - // Get rid of it to free the memory! - delete thisRef; + // Get rid of it to free the memory! + delete thisRef; + } thisMatch->setIncompleteScore(score); thisMatch->setAnchor(dm->anchor); -- Gilles R. Detillieux E-mail: Spinal Cord Research Centre WWW: http://www.scrc.umanitoba.ca/~grdetil Dept. Physiology, U. of Manitoba Phone: (204)789-3766 Winnipeg, MB R3E 3J7 (Canada) Fax: (204)789-3930 ---------------------------------------------------------------------- To unsubscribe from the htdig mailing list, send a message to htdig-request@sdsu.edu containing the single word "unsubscribe" in the body of the message.