Hi,
As Bryan already mentioned about it, <a> and <view> for active record
objects are slow. Eliminating calls for those tags (and fields=""
attribute which calls <view> internally) may be worth it.
See following results. You'll see dryml itself is already not fast
(the first entry, 500 * "string" takes 250..300ms including GC), as
well as <a> and <view> are much slower.
<!-- app/views/front/index.dryml -->
<section class="content-body">
<!-- C2Q 9550 2.83GHz, Linux 3.2.0-2-686-pae (Debian sid), ruby
1.9.2p180, hobo 1.3.0, rails 3.0.10
guest (GC enabled)
/ logged-in user (GC enabled)
/ logged-in user (GC enabled, custom <view for="User">)
/ logged-in user (GC disabled) -->
<br/>
<!-- 316 / 311 / 312 / 248 ms --><how-slow num="500">string</how-slow>
<!-- 214 / 209 / 214 / 182 ms --><how-slow num="400">string</how-slow>
<!-- 159 / 154 / 155 / 126 ms --><how-slow num="300">string</how-slow>
<!-- 83 / 80 / 82 / 82 ms --><how-slow num="200">string</how-slow>
<!-- 50 / 49 / 50 / 52 ms --><how-slow num="100">string</how-slow>
<!-- 313 / 310 / 316 / 250 ms --><how-slow><%= can_view?(current_user)
%></how-slow>
<!-- 709 / 700 / 702 / 572 ms --><how-slow><view
with="&%(string)"/></how-slow>
<br/>
<!-- 309 / 384 / 382 / 320 ms --><how-slow><%= current_user.to_s
%></how-slow>
<!-- 708 / 765 / 769 / 639 ms --><how-slow><view
with="¤t_user.to_s"/></how-slow>
<br/>
<!-- 343 / 494 / 498 / 405 ms --><how-slow><do
with="¤t_user"><%= this.login %></do></how-slow>
<!-- 738 / 964 / 967 / 794 ms --><how-slow><do
with="¤t_user"><view with="&this.login"/></do></how-slow>
<!-- 735 / 1078 / 1054 / 904 ms --><how-slow><do
with="¤t_user"><view:login/></do></how-slow>
<br/>
<!-- 721 / 704 / 708 / 581 ms --><how-slow><a
href="&user_path(1)">string</a></how-slow>
<!-- 317 / 789 / 794 / 673 ms --><how-slow><% raise
Hobo::PermissionDeniedError unless can_view?(current_user) %><% if
current_user.signed_up? %><a href="&user_path(current_user.id)"><%=
current_user.to_s %></a><% else %><%= current_user.to_s %><% end %></how-slow>
<!-- 343 / 824 / 825 / 696 ms --><how-slow><do with="¤t_user"><%
raise Hobo::PermissionDeniedError unless can_view? %><% if this.signed_up? %><a
href="&user_path(this.id)"><%= this.to_s %></a><% else %><%= this.to_s %><% end
%></do></how-slow>
<!-- 410 / 2310 / 1329 / 1905 ms --><how-slow><view
with="¤t_user"/></how-slow>
<!-- 425 / 1633 / 1635 / 1384 ms --><how-slow><a
with="¤t_user"/></how-slow>
</section>
<!-- app/views/taglibs/application.dryml -->
<def tag="how-slow" attrs="num">
<% disable_gc = false %>
<% num ||= 500 %>
<% GC.start %>
<% GC.disable if disable_gc %>
<% t0 = Time.now %>
<div style="display: none;">
<repeat with="&(0..(num.to_i))">
<do param="default"/>
</repeat>
</div>
<% GC.enable if disable_gc %>
<% GC.start %>
<% t1 = Time.now %>
<br/>
<%= ((t1 - t0) * 1000).to_i %>
</def>
<!--
<def tag="view" for="User">
<% raise Hobo::PermissionDeniedError, "view of non-viewable user #{this}"
unless can_view? %>
<% if this.signed_up? %>
<a href="&user_path(this.id)"><%= this.to_s %></a><%#
user_path(user.id) is much faster than user_path(user) %>
<% else %>
<%= this.to_s %>
<% end %>
</def>
-->
-----
Tomoaki Hayasaka <[email protected]>
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