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More advice

Samuel Thibault 14 years ago
parent
commit
8af15965bc
1 changed files with 3 additions and 1 deletions
  1. 3 1
      doc/chapters/perf-optimization.texi

+ 3 - 1
doc/chapters/perf-optimization.texi

@@ -313,6 +313,8 @@ detailed in the next chapter. The various informations should be checked for.
   looks like (see @ref{DAG}).
   looks like (see @ref{DAG}).
   @item If only some workers are completely red (Blocked), for some reason the
   @item If only some workers are completely red (Blocked), for some reason the
   scheduler didn't assign tasks to them. Perhaps the performance model is bogus,
   scheduler didn't assign tasks to them. Perhaps the performance model is bogus,
-  check it (see @ref{Codelet performance}).
+  check it (see @ref{Codelet performance}). Do all your codelets have a
+  performance model?  When some of them don't, the schedulers switches to a
+  greedy algorithm which thus performs bad.
 @end itemize
 @end itemize
 @end itemize
 @end itemize