我正在开发一个使用俄罗斯玩偶缓存的Rails（4.1.14）站点，如下所示：
home.html.erb：
<%= render partial: 'product/group', locals: {products: @products} %>`
产品/ _group.html.erb：
<% products.each do |product| %>
<%= render partial: 'product/big', locals: {product: product} %>`
<%= render partial: 'product/small', locals: {product: product} %>`
<% end %>
产品/ _big.html.erb：
<%= product.name %>`
<%= render partial: 'product/big_image', locals: {product: product} %>`
等等。
出于某种原因，此页面需要很长时间才能加载开发（12秒！）。
当我将所有嵌套的部分内联到最外面的部分时，页面加载下降75％，只有3秒。
这看起来很疯狂，因为它是与屏幕呈现的完全相同的内容，而最外层的缓存应该与我如何设计内部的内容无关。
那么究竟是什么导致了这种放缓呢？
我唯一能想到的是Rails计算内层的缓存摘要。我想在生产中，Rails知道代码不会改变（？），因此它不会递归以获取摘要？
有什么想法吗？
修改
我甚至尝试将最外层（product/group）片段设置为<% cache do %>，以便所有组都呈现完全相同。网站仍然加载需要6秒钟，日志会显示一系列活动：
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抛出一块HTML ...事实上，HTML的相同的版块一次又一次......但每个< / em>一个导致所有这些日志记录活动。每一个需要500毫秒！这是怎么回事？
谢谢！
答案 0 :(得分：1)
您的记录器可能会遇到瓶颈，尤其是对于STDOUT。如果您的服务器将日志记录信息转储到终端，则可能是罪魁祸首。 （是的，我知道这听起来很疯狂）
尝试在关闭日志记录或将其写入文件而不是STDOUT的情况下运行它。 您可以异步拖尾或更少-F文件。