[Mono-list] XML / XPaths Very Slow Compared to MS C#

[Bradford Stephens]

Hey there,

Has anyone gotten a chance to look into this? :)

Cheers,
Bradford

On Wed, Sep 10, 2008 at 2:19 PM, Bradford Stephens
<bradfordstephens at gmail.com> wrote:
> Thanks, I appreciate it. This has the team stumped :)
>
> On Tue, Sep 9, 2008 at 6:10 PM, Atsushi Eno <atsushi at ximian.com> wrote:
>> Hello,
>>
>> That's interesting. If I have enough time I'll check what are likely
>> culprits with modified version of the cases and possibly fix them.
>>
>> Atsushi Eno
>>
>> Bradford Stephens wrote:
>>>
>>> Hello all,
>>>
>>> It seems that XPath selection is several orders of magnitude slower in
>>> Mono 2.0 on Ubuntu than on C# on Windows XP.
>>>
>>> The example below is pretty straightforward, and doesn't seem like
>>> it's much slower, but we do this millions of times a day. In some
>>> cases, I've seen parsing a document go from 10 ms on Windows to over
>>> 2000 ms on Mono 2.0/Linux.
>>>
>>> I've made a Mono Project to let you test it yourselves:
>>> http://www.giborama.com/TestSlowXML.tar
>>>
>>> I've advocated the switch of our company's platform from Windows to
>>> Linux, but XML/XPath is an essential part of the business, and with it
>>> being so slow, we're dead in the water.
>>>
>>> I would greatly appreciate any help you may have :)
>>>
>>> ~~~~
>>>
>>> Windows XP / C# 2005:
>>>
>>> Xpath: //head/title took 2
>>> Xpath: //div[@id= 'content']/div[starts-with (@id, 'p')] took 0
>>> Xpath: .//h2/a took 0
>>> Xpath: .//p[@class= 'byline']/a[position()=1] took 0
>>> Xpath: .//p[@class= 'byline'] took 1
>>> Xpath: .//h2 took 0
>>> Xpath: .//div[@class= 'post']/div[starts-with (@id, 'pc')] took 0
>>> Xpath: .//div[@class= 'post']/div[starts-with (@id, 'pc')]//img took 0
>>> Xpath: .//div[@class= 'post']/div[starts-with (@id, 'pc')]//a took 0
>>> Xpath: //p[@class= 'paging']/a[@class= 'alignright arrowforward'] took 0
>>>
>>>
>>> Ubuntu / Mono 2.0:
>>>
>>> Xpath: //head/title took 24
>>> Xpath: //div[@id= 'content']/div[starts-with (@id, 'p')] took 8
>>> Xpath: .//h2/a took 1
>>> Xpath: .//p[@class= 'byline']/a[position()=1] took 5
>>> Xpath: .//p[@class= 'byline'] took 3
>>> Xpath: .//h2 took 1
>>> Xpath: .//div[@class= 'post']/div[starts-with (@id, 'pc')] took 5
>>> Xpath: .//div[@class= 'post']/div[starts-with (@id, 'pc')]//img took 5
>>> Xpath: .//div[@class= 'post']/div[starts-with (@id, 'pc')]//a took 5
>>> Xpath: //p[@class= 'paging']/a[@class= 'alignright arrowforward'] took 8
>>>
>>> Cheers,
>>> Bradford
>>> _______________________________________________
>>> Mono-list maillist  -  Mono-list at lists.ximian.com
>>> http://lists.ximian.com/mailman/listinfo/mono-list
>>>
>>
>>
>