Ruby 进程吃掉 100% cpu

Question

当我尝试从我的应用程序（使用设计）注销时，rails 应用程序挂起并且 ruby​​ 占用了 100% 的 CPU，在我重新启动服务器后，它仍然冻结（无法加载页面）。仅当我删除并重新创建数据库时它才消失。我正在使用 PostgreSQL，尝试切换到 MySQL，但没有帮助。使用 mongrel（也发生在 webrick 中）。 Ruby 1.9.2，rails 3.0.9

strace

futex(0xe1be68, FUTEX_WAKE_PRIVATE, 1)  = 1
futex(0xe1c3fc, FUTEX_WAIT_PRIVATE, 1, NULL) = ? ERESTARTSYS (To be restarted)
--- SIGINT (Interrupt) @ 0 (0) ---
rt_sigreturn(0x2)                       = -1 EINTR (Interrupted system call)
futex(0xe1c3fc, FUTEX_WAIT_PRIVATE, 1, NULL) = 0
futex(0xe1c458, FUTEX_WAKE_PRIVATE, 1)  = 0
futex(0xe1be68, FUTEX_WAIT_PRIVATE, 2, NULL) = 0
futex(0xe1be68, FUTEX_WAIT_PRIVATE, 2, NULL) = 0
futex(0xe1be68, FUTEX_WAIT_PRIVATE, 2, NULL) = 0
futex(0xe1be68, FUTEX_WAIT_PRIVATE, 2, NULL) = 0
futex(0xe1be68, FUTEX_WAIT_PRIVATE, 2, NULL) = 0
futex(0xe1be68, FUTEX_WAIT_PRIVATE, 2, NULL) = 0
futex(0xe1be68, FUTEX_WAIT_PRIVATE, 2, NULL) = 0
futex(0xe1be68, FUTEX_WAIT_PRIVATE, 2, NULL) = 0
futex(0xe1be68, FUTEX_WAIT_PRIVATE, 2, NULL) = 0
futex(0xe1be68, FUTEX_WAIT_PRIVATE, 2, NULL) = 0
futex(0xe1be68, FUTEX_WAIT_PRIVATE, 2, NULL) = -1 EAGAIN (Resource temporarily unavailable)
futex(0xe1be68, FUTEX_WAIT_PRIVATE, 2, NULL) = 0
futex(0xe1be68, FUTEX_WAIT_PRIVATE, 2, NULL) = 0
futex(0xe1be68, FUTEX_WAIT_PRIVATE, 2, NULL) = 0
futex(0xe1be68, FUTEX_WAIT_PRIVATE, 2, NULL) = 0
futex(0xe1be68, FUTEX_WAIT_PRIVATE, 2, NULL) = 0
futex(0xe1be68, FUTEX_WAIT_PRIVATE, 2, NULL) = 0
futex(0xe1be68, FUTEX_WAIT_PRIVATE, 2, NULL) = 0
futex(0xe1be68, FUTEX_WAIT_PRIVATE, 2, NULL) = 0
futex(0xe1be68, FUTEX_WAIT_PRIVATE, 2, NULL) = 0
futex(0xe1be68, FUTEX_WAIT_PRIVATE, 2, NULL) = 0
futex(0xe1be68, FUTEX_WAIT_PRIVATE, 2, NULL) = 0
futex(0xe1be68, FUTEX_WAIT_PRIVATE, 2, NULL) = 0
futex(0xe1be68, FUTEX_WAIT_PRIVATE, 2, NULL) = 0
futex(0xe1be68, FUTEX_WAIT_PRIVATE, 2, NULL) = 0
futex(0xe1be68, FUTEX_WAIT_PRIVATE, 2, NULL) = 0
futex(0xe1be68, FUTEX_WAIT_PRIVATE, 2, NULL) = 0
futex(0xe1be68, FUTEX_WAIT_PRIVATE, 2, NULL) = 0
futex(0xe1be68, FUTEX_WAIT_PRIVATE, 2, NULL) = 0
futex(0xe1be68, FUTEX_WAIT_PRIVATE, 2, NULL) = 0
futex(0xe1be68, FUTEX_WAIT_PRIVATE, 2, NULL) = 0
futex(0xe1be68, FUTEX_WAIT_PRIVATE, 2, NULL) = 0

控制台输出：

Started GET "/signout" for 127.0.0.1 at 2011-11-09 10:11:13 +0200
  SQL (1.0ms)   SELECT a.attname, format_type(a.atttypid, a.atttypmod), d.adsrc, a.attnotnull
 FROM pg_attribute a LEFT JOIN pg_attrdef d
 ON a.attrelid = d.adrelid AND a.attnum = d.adnum
 WHERE a.attrelid = '"jokes"'::regclass
 AND a.attnum > 0 AND NOT a.attisdropped
 ORDER BY a.attnum
  Processing by SessionsController#destroy as HTML
Redirected to http://localhost:3000/
Completed 302 Found in 1ms

我不太确定那里会发生什么？

UPD* 这冻结不仅发生在注销时，而且是随机发生的:( Mac 上的其他开发人员也没有这个问题，我运行 Ubuntu 11.10，在 10.04 上尝试过，仍然有它。

Answer 1

尝试在development.rb中打开cache_classes