我正在开发一个使用俄罗斯玩偶缓存的Rails（4.1.14）网站，如下所示：
home.html.erb:
<%= render partial: 'product/group', locals: {products: @products} %>`
product/_group.html.erb:
<% products.each do |product| %>
<%= render partial: 'product/big', locals: {product: product} %>`
<%= render partial: 'product/small', locals: {product: product} %>`
<% end %>
product/_big.html.erb:
<%= product.name %>`
<%= render partial: 'product/big_image', locals: {product: product} %>`
等等。
由于某些原因，在开发过程中加载此页面需要非常长的时间（12秒！）。
当我将所有嵌套的部分内联到最外面的部分时，页面加载量下降了75%，只有3秒。
这似乎很疯狂，因为它是呈现在屏幕上的完全相同的内容，而最外层的缓存应该会使我如何设计内部内容变得无关紧要。
那么，究竟是什么原因导致了经济放缓呢？
我唯一能想到的是，是Rails为内层计算缓存摘要。我想在生产中，Rails知道代码不会更改（？），所以它不会递归以获得摘要？
有什么想法吗？
编辑：
我甚至尝试将最外面的（product/group）片段设置为简单的<% cache do %>，这样所有组都将呈现完全相同的内容。站点仍然需要大约6秒才能加载，日志显示了一堆活动：
Cache digest for site/app/views/home/_product_big.html.erb: 336d5ebc5436534e61d16e63ddfca327
Cache digest for site/app/views/shared/_discount.html.erb: 3c2aa3685fcb60f7d94e19d84263da77
Cache digest for site/app/views/shared/_sale.html.erb: cb063c33aee387ae346ffe0d1679e7d9
Cache digest for site/app/views/products/_image.html.erb: 50653bfa64782626a81e769fddc545ac
Cache digest for site/app/views/home/_product_small.html.erb: f2c5bb4035a8b4261a2b6446ecad09ec
Cache digest for site/app/views/home/_product_group.html.erb: 9c5de02f4004079ae10edd019083b659
Read fragment views/localhost:3000//9c5de02f4004079ae10edd019083b659 (1.3ms)
Rendered site/app/views/home/_product_group.html.erb (531.8ms)
Cache digest for site/app/views/home/_product_big.html.erb: 336d5ebc5436534e61d16e63ddfca327
Cache digest for site/app/views/shared/_discount.html.erb: 3c2aa3685fcb60f7d94e19d84263da77
Cache digest for site/app/views/shared/_sale.html.erb: cb063c33aee387ae346ffe0d1679e7d9
Cache digest for site/app/views/products/_image.html.erb: 50653bfa64782626a81e769fddc545ac
Cache digest for site/app/views/home/_product_small.html.erb: f2c5bb4035a8b4261a2b6446ecad09ec
Cache digest for site/app/views/home/_product_group.html.erb: 9c5de02f4004079ae10edd019083b659
Read fragment views/localhost:3000//9c5de02f4004079ae10edd019083b659 (0.1ms)
Rendered site/app/views/home/_product_group.html.erb (472.9ms)
Cache digest for site/app/views/home/_product_big.html.erb: 336d5ebc5436534e61d16e63ddfca327
Cache digest for site/app/views/shared/_discount.html.erb: 3c2aa3685fcb60f7d94e19d84263da77
Cache digest for site/app/views/shared/_sale.html.erb: cb063c33aee387ae346ffe0d1679e7d9
Cache digest for site/app/views/products/_image.html.erb: 50653bfa64782626a81e769fddc545ac
Cache digest for site/app/views/home/_product_small.html.erb: f2c5bb4035a8b4261a2b6446ecad09ec
Cache digest for site/app/views/home/_product_group.html.erb: 9c5de02f4004079ae10edd019083b659
Read fragment views/localhost:3000//9c5de02f4004079ae10edd019083b659 (0.1ms)
Rendered site/app/views/home/_product_group.html.erb (521.7ms)
Cache digest for site/app/views/home/_product_big.html.erb: 336d5ebc5436534e61d16e63ddfca327
Cache digest for site/app/views/shared/_discount.html.erb: 3c2aa3685fcb60f7d94e19d84263da77
Cache digest for site/app/views/shared/_sale.html.erb: cb063c33aee387ae346ffe0d1679e7d9
Cache digest for site/app/views/products/_image.html.erb: 50653bfa64782626a81e769fddc545ac
Cache digest for site/app/views/home/_product_small.html.erb: f2c5bb4035a8b4261a2b6446ecad09ec
Cache digest for site/app/views/home/_product_group.html.erb: 9c5de02f4004079ae10edd019083b659
Read fragment views/localhost:3000//9c5de02f4004079ae10edd019083b659 (0.1ms)
Rendered site/app/views/home/_product_group.html.erb (492.3ms)
Cache digest for site/app/views/home/_product_big.html.erb: 336d5ebc5436534e61d16e63ddfca327
Cache digest for site/app/views/shared/_discount.html.erb: 3c2aa3685fcb60f7d94e19d84263da77
Cache digest for site/app/views/shared/_sale.html.erb: cb063c33aee387ae346ffe0d1679e7d9
Cache digest for site/app/views/products/_image.html.erb: 50653bfa64782626a81e769fddc545ac
Cache digest for site/app/views/home/_product_small.html.erb: f2c5bb4035a8b4261a2b6446ecad09ec
Cache digest for site/app/views/home/_product_group.html.erb: 9c5de02f4004079ae10edd019083b659
Read fragment views/localhost:3000//9c5de02f4004079ae10edd019083b659 (0.1ms)
Rendered site/app/views/home/_product_group.html.erb (512.0ms)
Cache digest for site/app/views/home/_product_big.html.erb: 336d5ebc5436534e61d16e63ddfca327
Cache digest for site/app/views/shared/_discount.html.erb: 3c2aa3685fcb60f7d94e19d84263da77
Cache digest for site/app/views/shared/_sale.html.erb: cb063c33aee387ae346ffe0d1679e7d9
Cache digest for site/app/views/products/_image.html.erb: 50653bfa64782626a81e769fddc545ac
Cache digest for site/app/views/home/_product_small.html.erb: f2c5bb4035a8b4261a2b6446ecad09ec
Cache digest for site/app/views/home/_product_group.html.erb: 9c5de02f4004079ae10edd019083b659
Read fragment views/localhost:3000//9c5de02f4004079ae10edd019083b659 (0.1ms)
Rendered site/app/views/home/_product_group.html.erb (564.9ms)
Cache digest for site/app/views/home/_product_big.html.erb: 336d5ebc5436534e61d16e63ddfca327
Cache digest for site/app/views/shared/_discount.html.erb: 3c2aa3685fcb60f7d94e19d84263da77
Cache digest for site/app/views/shared/_sale.html.erb: cb063c33aee387ae346ffe0d1679e7d9
Cache digest for site/app/views/products/_image.html.erb: 50653bfa64782626a81e769fddc545ac
Cache digest for site/app/views/home/_product_small.html.erb: f2c5bb4035a8b4261a2b6446ecad09ec
Cache digest for site/app/views/home/_product_group.html.erb: 9c5de02f4004079ae10edd019083b659
Read fragment views/localhost:3000//9c5de02f4004079ae10edd019083b659 (0.2ms)
Rendered site/app/views/home/_product_group.html.erb (484.1ms)
Cache digest for site/app/views/home/_product_big.html.erb: 336d5ebc5436534e61d16e63ddfca327
Cache digest for site/app/views/shared/_discount.html.erb: 3c2aa3685fcb60f7d94e19d84263da77
Cache digest for site/app/views/shared/_sale.html.erb: cb063c33aee387ae346ffe0d1679e7d9
Cache digest for site/app/views/products/_image.html.erb: 50653bfa64782626a81e769fddc545ac
Cache digest for site/app/views/home/_product_small.html.erb: f2c5bb4035a8b4261a2b6446ecad09ec
Cache digest for site/app/views/home/_product_group.html.erb: 9c5de02f4004079ae10edd019083b659
Read fragment views/localhost:3000//9c5de02f4004079ae10edd019083b659 (0.1ms)
Rendered site/app/views/home/_product_group.html.erb (526.2ms)
这些都是缓存的，所以它应该直接从内存中放入HTML板。。。事实上，相同的HTML板一次又一次。。。然而每个都会导致所有这些日志活动。每一个都需要500毫秒！这是怎么回事？
谢谢！
您可能会被记录器阻塞，尤其是在STDOUT的情况下。如果你的服务器将日志信息转储到你的终端，那可能就是罪魁祸首。（是的，我知道这听起来很疯狂）
试着在关闭日志记录或写入文件而不是STDOUT的情况下运行它。您可以异步跟踪或减少-F文件。