Snow Leopard 上的 ruby/rails/mysql 性能下降
我为此花费了很多时间。我在构建东西时没有遇到问题，但我发现我的测试套件的运行速度比我在 OS X 10.5.x 上时慢了大约 2 倍。我花了很多时间尝试不同的优化设置（学习避免自制的 llvm-gcc 编译）。我刚刚了解到我需要调整 /Library/Preferences/SystemConfiguration/com.apple.Boot.plist 以使内核以 64 位模式启动。然而，即使在预热 mysql 服务器之后，我的 Rails 应用程序的运行速度仍然比以前慢一些。
那么我可能需要研究哪些性能调整？现在，在某些方面，库存 ruby 1.8.7 的运行速度比 1.9.1 更快，我真的很想知道是否有什么我应该寻找的。我的所有开发软件都针对 x86_64、mysql 进行了 -O2 优化，使用常规 gcc（不是 llvm-gcc）进行编译。
I've burned a bunch of hours on this. I'm not having problems getting things to build, but I am seeing that my test suite runs about 2x slower than when I was on OS X 10.5.x . I've spent a lot of time playing around with different optimization settings (learning to avoid homebrew's llvm-gcc compilation). I've just learned that I needed to tweaks /Library/Preferences/SystemConfiguration/com.apple.Boot.plist in order to get the kernel to boot in 64 bit mode. However, my rails app is still running a bit slower than before, even after warming up the mysql server.
So what performance tweaks might i need to look into? Right now the stock ruby 1.8.7 runs faster than 1.9.1 for some things, and I'd really like to know if there is anything I should be looking for. All my dev software has been compiled for x86_64, mysql with -O2 optimization, using regular gcc (not llvm-gcc).
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原来我很蠢。我在测试套件中添加/修改了几行，这消除了我担心的性能。
turned out i was being stupid. I'd added/modified a few lines in my test suite which killed the performance that I was concerned about.