Changes between Version 7 and Version 8 of DeveloperGuidelines/Optimisation

Timestamp:

11/16/09 08:22:33 (15 years ago)

Author:

Fran Boon

Comment:

'for row in rows' slow

DeveloperGuidelines/Optimisation

@@ -3 +3 @@
 Writing code which runs fast.
 
-Consider having configurations which aread from DB frequently but written-to rarely, be set in configuration files which are written-out from the DB (like the CSS from themes)
+Consider having configurations which are read from DB frequently but written-to rarely, be set in configuration files which are written-out from the DB (like the CSS from themes)
 
+ * http://wiki.python.org/moin/PythonSpeed/PerformanceTips#Loops
  * http://www.python.org/doc/essays/list2str/
  * http://www.skymind.com/~ocrow/python_string/
  * http://diveintopython.org/performance_tuning/index.html
+ * If a specific inner-loop routine canot be optimised in Python, then consider writing a C routine for this use case.
+
+{{{
+for i in range(0, len(rows)):
+     row=rows[i]
+}}}
+runs much faster than:
+{{{
+ for row in rows:
+}}}
+(0.05 vs. 0.001 seconds in my test case).
 
 === Profiling ===