I have something like (very simplified):
- content_for :main_content do
- cache :fragment => 'main_content' do
%p Hello World
In production I was experiencing lower speed than I had hoped w/ all
my fragment caching so I poked around w/ ruby-prof and found that
String#each was being called a ton. Tracing up the stack it was being
called by Haml::Helpers#capture_haml_with_buffer, which does:
captured.each do |line|
tabs = line.index(/[^ ]/)
min_tabs ||= tabs
min_tabs = min_tabs > tabs ? tabs : min_tabs
end
result = captured.map do |line|
line[min_tabs..-1]
end
So it HAML was getting my giant cached fragment (because of the
content_for), using #each to split it on \n, doing it's tab stuff then
putting it all back together. My workaround for this was to set a
FRAGMENT_KEY in my production.rb, something like:
FRAGMENT_KEY = '<bunch of random letters>'
Then getting into Rails caching logic in
ActionController::Caching::Fragments::UnthreadedMemoryStore changing
the write method a tad like:
def write(name, value, options=nil) #:nodoc:
@data[name] = "<!-- #{FRAGMENT_KEY} --/>" + value
end
So the random letters get appended to the beginning of each fragment
in an HTML comment (could strip this out later, but I didn't really
see the need)
Finally I changed the Haml::Helpers#capture_haml_with_buffer to:
def capture_haml_with_buffer(local_buffer, *args, &block)
position = local_buffer.length
block.call *args
captured = local_buffer.slice!(position..-1)
if defined?(FRAGMENT_KEY) && captured =~ /^<!-- #{FRAGMENT_KEY}
--\/>\n/
result = captured
else
min_tabs = nil
captured.each do |line|
tabs = line.index(/[^ ]/)
min_tabs ||= tabs
min_tabs = min_tabs > tabs ? tabs : min_tabs
end
result = captured.map do |line|
line[min_tabs..-1]
end
end
result.to_s
end
So if the chunk of stuff I'm capturing begins w/ the exact
FRAGMENT_KEY comment then it will skip all the operations and just
spit it back out.
In my case this more than doubled my rendering speed and got
String#each out of the top of my ruby-prof output.
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