Re: [Jython-users] printing to file with Jython, speed is very poor

[Edgardo G. <edg...@cr...>]

Hi

Try with this

import StringIO
import time

file = open('PrintTest.txt', 'w')
item = "some, comma, separated, values\n"
buff = StringIO.StringIO()
t1 = time.time()
# xrange
for i in xrange(10000):
    buff.write(item)

buff.seek(0)
file.write(buff.read(buff.len))
buff.close()
file.close()
print time.time() - t1

Edgardo Genini
edg...@cr...


Patrick Chamberlain wrote:

> Hi
>
> If this is not the right place to ask this question, please accept my
> appolgies and kindly point me in the right direction. I've tried searching
> comp.lang.python and general Googling without success.
>
> My question is:
>
> Is there a big performance problem printing to a file from Jython using the
> simple print >> file, expression syntax?
> Or have a made a dumb newbie blunder?
>
> The background is:
>
> I've been experimenting with using Jython to experiment with extracting
> data from a number of databases and printing the results in csv format to a
> file.  Jython has made it very easy to quickly write something using the
> Java libraries I already have access to. I was so impressed I wanted to
> recommend using the Jython code itself in production, but I have hit a
> problem when printing to a file from Jython.
>
> I'm typically printing 10,000 rows to a file, with some reformatting.
> Trying to narrow the problem down, I've now eliminated everything from the
> code except the printing to file part. Stripped right down the code is
> trivial ...
>
> file = open ("PrintTest.txt",'w')
> item = "some, comma, separated, values"
> for i in range (10000):
>      print >> file, item
> file.close()
>
> In Jython this is running painfully slowly. For example
>
> On Win2K/Pentium3/256MB/Java 1.4/Jython 2.1 this is taking about 5 minutes,
> there's heavy hard disk activity. On the same machine the same code run
> from Python 2.2 completes in under 1 sec.
>
> I tried the same code on Solaris 8 and got a similar dramatic difference
> between Python and Jython, although a bit less of a difference than on Windows.
>
> Thanks in advance
>
> Patrick Chamberlain
>
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