Re: htdig: 3.1.b2 -> 3.1.b3 performance degradation +


Gilles Detillieux (grdetil@scrc.umanitoba.ca)
Tue, 5 Jan 1999 17:33:56 -0600 (CST)


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: <grdetil@scrc.umanitoba.ca>
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
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This archive was generated by hypermail 2.0b3 on Thu Jan 07 1999 - 07:52:39 PST