Re: [Twisted-web] [Nevow] template performance

Dec. 15, 2006

      Alvin Wang ha scritto:
...
Just curious.  How much slower?
10 times!

manlio@synapsis:~/projects/tests/django$ python static.py
33.58 usec/pass

manlio@synapsis:~/projects/tests/nevow$ python static.py
344.71 usec/pass

On a Dell Inspiron 6400 with an Intel Duo Core 2 7200 processor.

Here is the Python code:

import timeit
import random
from nevow import inevow, rend, loaders

COLS = 5
ROWS = 20

class Main(rend.Page):
     docFactory = loaders.xmlfile("template.xhtml")

     def data_header(self, ctx, data):
         return range(COLS)

     def data_table(self, ctx, data):
         return  [
             [random.random() for j in range(COLS)]
             for i in range(ROWS)
             ]

main = Main()

t = timeit.Timer("main.renderSynchronously()",
                  "from __main__ import main")
print "%.2f usec/pass" % (10000 * t.timeit(number=1000) / 1000)

and the template:

<!DOCTYPE html
   PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
   "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html xmlns="http://www.w3.org/1999/xhtml"
       xmlns:n="http://nevow.com/ns/nevow/0.1"
       lang="en" xml:lang="">
   <head>
     <title>Test Nevow performance</title>
   </head>
   <body>
     <table>
       <caption>RandomTable</caption>
       <thead>
         <tr n:render="sequence" n:data="header">
           <th n:pattern="item" n:render="string" />
         </tr>
       </thead>
       <tbody n:render="sequence" n:data="table">
         <tr n:pattern="item" n:render="sequence">
           <td n:pattern="item" n:render="string" />
         </tr>
       </tbody>
     </table>
   </body>
</html>

Now here is the Django code:

import timeit
import random

from twisted.python import util
from django.conf import settings

# Ugh!
settings.configure(TEMPLATE_DIRS=[util.sibpath(__file__, '')])

from django.shortcuts import render_to_response
from django.db import connection

COLS = 5
ROWS = 20

def view():
     header = range(COLS)
     table = [
             [random.random() for j in range(COLS)]
             for i in range(ROWS)
             ]

     return render_to_response('template.xhtml',
                               {"table": table, "header": header})

t = timeit.Timer("view()", "from __main__ import view")
print "%.2f usec/pass" % (10000 * t.timeit(number=1000) / 1000)

and the template:

<!DOCTYPE html
   PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
   "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html xmlns="http://www.w3.org/1999/xhtml"
       xmlns:n="http://nevow.com/ns/nevow/0.1"
       lang="en" xml:lang="en">
   <head>
     <title>Test Django performance</title>
   </head>
   <body>
     <table>
       <caption>RandomTable</caption>
       <thead>
         <tr>
           {% for i in header %}
             <th>{{ i }}</li>
           {% endfor %}
         </tr>
       </thead>
       <tbody>
         {% for i in table %}
           <tr>
             {% for j in i %}
               <td>{{ j }}</td>
             {% endfor %}
           </tr>
         {% endfor %}
       </tbody>
     </table>
   </body>
</html>

Regards  Manlio Perillo