XML builder performance


#1

Hi all,

I have been doing some performance testing, and have noticed it takes
significantly longer to render a XML output then a HTML one. It made me
think perhaps there’s a faster way of generating XML than using XML
builder.

I did a quick search and did not find any alternatives, or anyone
talking about XML builder’s performance issues.

Is there anyway of optimizing XML Builder? Or is there a faster
alternative?


#2

The only Ruby Library I’ve found in the last 2 weeks that seems to do
XMl output is: http://www.tutorialspoint.com/ruby/ruby_xml_xslt.htm

However the builder API is nice and for me personally worth the slightly
longer output. However saying that I managed to output 100 records to
XML within 10 seconds and I don’t think it’s builder slowing things
down.

Cheers,
Dan


#3

Dan W. wrote:

The only Ruby Library I’ve found in the last 2 weeks that seems to do
XMl output is: http://www.tutorialspoint.com/ruby/ruby_xml_xslt.htm

However the builder API is nice and for me personally worth the slightly
longer output. However saying that I managed to output 100 records to
XML within 10 seconds and I don’t think it’s builder slowing things
down.

Thanks for the reply.

I’m using it to output KML on the fly, so every half a second counts. At
the moment, it’s taking .5 seconds longer to generate a small-ish file
than it takes for the HTML output.

If there are no clear drop-in alternatives, I might leave off optimising
my KML outputs.

Thanks,
Xin


#4

On Fri, Oct 31, 2008 at 9:01 AM, Xin Z. removed_email_address@domain.invalid wrote:

I have been doing some performance testing, and have noticed it takes
significantly longer to render a XML output then a HTML one. It made me
think perhaps there’s a faster way of generating XML than using XML
builder.

The standard answer for XML performance issues in Ruby is to switch to
libxml-ruby.


Avdi

Home: http://avdi.org
Developer Blog: http://avdi.org/devblog/
Twitter: http://twitter.com/avdi
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#5

The standard answer for XML performance issues in Ruby is to switch to
libxml-ruby.

Isn’t libxml-ruby is used for parsing XML? Where as I only need to
output XML.


#6

On Fri, Oct 31, 2008 at 10:32 AM, Xin Z. removed_email_address@domain.invalid
wrote:

Isn’t libxml-ruby is used for parsing XML? Where as I only need to
output XML.

You can build and output XML with it. See for instance the Node
documentation:

http://libxml.rubyforge.org/rdoc/classes/LibXML/XML/Node.html


Avdi

Home: http://avdi.org
Developer Blog: http://avdi.org/devblog/
Twitter: http://twitter.com/avdi
Journal: http://avdi.livejournal.com


#7

On Oct 31, 2008, at 7:01 AM, Xin Z. wrote:

Is there anyway of optimizing XML Builder? Or is there a faster
alternative?

try tagz

gem install tagz

require ‘tagz’

xml = Tagz{ foo_{ bar_(:key => :value){ 42 } } }

http://codeforpeople.com/lib/ruby/tagz/tagz-4.4.0/README

a @ http://codeforpeople.com/


#8

On Oct 31, 2008, at 9:32 AM, Xin Z. wrote:

The standard answer for XML performance issues in Ruby is to switch
to
libxml-ruby.

Isn’t libxml-ruby is used for parsing XML? Where as I only need to
output XML.

Have you tried some stupid simple solution like just building the
string manually?

James Edward G. II


#9

On 31 Oct 2008, at 13:01, Xin Z. wrote:

Is there anyway of optimizing XML Builder? Or is there a faster
alternative?

I remember looking at this a while back and it turns out that a
significant bottleneck is how builder escapes your text (look in the
builder source for to_xs). It’s doing a lot more that it has too
(although I don’t deny that a lot of the time that will be useful).
There’s a gem (fast_xs) which implements that in C and makes that
bottleneck a lot faster.

Fred


#10

I agree with Avdi. LibXML will be the fastest builder-library
solution.

If you want a friendlier interface you can try Nokogiri (http://
nokogiri.rubyforge.org/) which is a wrapper for LibXML.

– Mark.


#11

On Sat, Nov 01, 2008 at 03:39:01AM +0900, Mark T. wrote:

I agree with Avdi. LibXML will be the fastest builder-library
solution.

If you want a friendlier interface you can try Nokogiri (http://
nokogiri.rubyforge.org/) which is a wrapper for LibXML.

Just so there is no confusion, Nokogiri wraps the libxml2 C library.
Not the LibXML ruby library. :slight_smile:


#12

On Fri, Oct 31, 2008 at 10:01:14PM +0900, Xin Z. wrote:

Is there anyway of optimizing XML Builder? Or is there a faster
alternative?

How large are the documents you’re trying to build? If they are small,
I recommend faster-builder:

http://github.com/codahale/faster-builder/tree/master

Unfortunately its speed diminshes a lot as the number of nodes increase.
If the documents are large, you should try Nokogiri’s builder. I found
it to be faster for larger documents than faster-builder.

Here is my benchmark: http://gist.github.com/14196

Here is some example builder code:

http://github.com/tenderlove/nokogiri/wikis/generate


#13

I switched a template for a huge xml file from xml builder to erb and
got a threefold speed increase.