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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 漢辰閱讀(1075) | 評論 (0) | 編輯收藏

Java 6 Server VM 三個性能調優參數

--XX:+DoEscapeAnalysis, off by default
如果一個對象的所有引用都是限于某一局部范圍，去掉對象上的鎖
--XX:+UseBiasedLocking, on by default
對多次取鎖的操作，比如循環，不釋放Lease即使鎖已被釋放，避免費時的取Lease操作（最有效）
--XX:+EliminateLocks, on by default
如果一段代碼經常性的加鎖和解鎖，在解鎖與下次加鎖之間又沒干什么事情，則可以將多次加加鎖解鎖操作合并成一對。也稱為Lock Coarsening (鎖粗化)

http://www.infoq.com/articles/java-threading-optimizations-p1

posted @ 2008-10-30 15:33 漢辰閱讀(676) | 評論 (0) | 編輯收藏

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