汉辰攻略

The palest ink is better than the best memory.
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2008年10月30日 #

Emacs Python Mode Cmds
  • C-j: Insert a new line with the same indentation level as the current line
  • RET: Insert a new line with the same indentation level as the current line
  • C-M-a: Go to the beginning of the current function or class
  • C-M-e: Go to the end of the current function or class
  • C-M-h: Mark the current function or class for copying, etc.
  • C-M-x: Execute the current function or class
  • C-c C-b: Submit a bug report
  • C-c C-c: Execute the buffer (i.e., the file being displayed)
  • C-c C-d: Trace the stack of the process being executed
  • C-c C-h: Get context-based help
  • C-c TAB: Indent a highlighted (or marked) region
  • C-c C-k: Mark a block of text. Using this at the head of a class or function definition will mark the entire block.
  • C-c C-l: Shift the region to the left. If the cursor is in the middle of a region, the lower half of the region will shift.
  • C-c RET: Execute the current file, opening a new window to show the output.
  • C-c C-n: Jump to the next statement.
  • C-c C-p: Jump to the previous statement.
  • C-c C-r: Shift the region to the right. If the cursor is in the middle of a region, the lower half of the region will shift.
  • C-c C-s: Execute a Python command.
  • C-c C-t: Toggle shells
  • C-c C-u: Go up one block
  • C-c C-v: List the version of the Python mode
  • C-c C-w: Run PyChecker
  • C-c !: Open the Python interactive shell
  • C-c #: Comment the highlighted (marked) region
  • C-c :: Check the indentation off-set
  • C-c <: Shift the region to the left
  • C-c >: Shift the region to the right
  • C-c ?: Show Python mode documentation
  • C-c |: Execute the highlighted (marked) part of the current program.
    • posted @ 2008-11-12 14:11 汉辰 阅读(1065) | 评论 (0) | 编辑 收藏

    Java 6 Server VM 三个性能调优参数

    --XX:+DoEscapeAnalysis, off by default
    如果一个对象的所有引用都是限于某一局部范围，去掉对象上的锁
    --XX:+UseBiasedLocking, on by default
    对多次取锁的操作，比如循环，不释放Lease即使锁已被释放，避免费时的取Lease操作 （最有效）
    --XX:+EliminateLocks, on by default
    如果一段代码经常性的加锁和解锁，在解锁与下次加锁之间又没干什么事情，则可以将多次加加锁解锁操作合并成一对。也称为Lock Coarsening (锁粗化)

    http://www.infoq.com/articles/java-threading-optimizations-p1
    posted @ 2008-10-30 15:33 汉辰 阅读(668) | 评论 (0) | 编辑 收藏