On Oct 11, 7:44 pm, ehansen486 <[email protected]> wrote:
> Nothing honestly moved the performance needle in a serious way.
>
> I've finally come to the conclusion that rails does not stream out as
> I'd expect. Here's a look at the perf stats rendered as the request
> runs:
it doesn't. Rails 3.1 will change some of that apparently (http://
yehudakatz.com/2010/09/07/automatic-flushing-the-rails-3-1-plan/)
If you drop down to the rack level (ie write this as a rails metal)
you should be able to stream responses - the rack body response can be
any thing that responds to each. and rack will keep calling that each
method until you're done.
.The docs also say that render :text => lambda { ...} allows streaming
but with various conflicting opinions form actual users (I've never
tried that). This may also depend on the server (mongrel, thin etc)
you use - it's no good you streaming data to rack if the next person
down the chain sits on it until is done
Fred
>
> Rendered hgrants/_request_detail (2.2ms)
> Rendered hgrants/_request_detail (3.9ms)
> Rendered hgrants/_request_detail (2.4ms)
> Rendered hgrants/_request_detail (2.3ms)
> Rendered hgrants/_request_detail (242.7ms)
> Rendered hgrants/_request_detail (2.2ms)
> Rendered hgrants/_request_detail (1.9ms)
> Rendered hgrants/_request_detail (1.8ms)
>
> We went from an average 2ms up to 242ms then back down. I saw this
> sporadically throughout the 1000 template renderings That suggests to
> me that memory is getting garbage collected. Also, I'm invoking the
> request from curl, and it reports no data downloaded until after my
> logfile tells me rails has finished processing all records in the
> view. The model IDs that result in the over-sized ms count vary from
> one request to another, so I'm convinced there is nothing in the app
> that is doing this. I even tested this by removing the call to the
> HAML template and replacing it with a block of generated text and
> observed similar behavior.
>
> This is how I'm invoking HAML from the XML Builder template:
> xml << render(:partial => 'hgrants/
> request_detail.html.haml', :locals => { :model => model })
>
> I also tried using this trick to try to get it to stream, but I
> observed exactly the same behavior; no data showed up in curl until
> all records had been processed.
> render :text => (lambda do |response, output|
> extend ApplicationHelper
>
> xml = Builder::XmlMarkup.new(
> :target => StreamingOutputWrapper.new(output),
> :indent => 2)
> eval(default_template.source, binding, default_template.path)
> end)
>
> (Also, in rails 3, the render :text with a Proc, rails 3 renders the
> Proc as a to_str rather than calling it.)
>
> This particular issue I can certainly work around but it's
> disappointing if it's true that there's no way in rails to stream
> output to the browser for large pages. And particularly disappointing
> if PHP/Symfony can outgun rails for streaming. I've been using rails
> since 2006 and most requests have fairly small responses so maybe the
> answer is to defer to a different technology for streaming larger
> files. But it seems like there should be a good solution for
> streaming data and flushing the output stream.
>
> Any help is greatly appreciated!
> Eric
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