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Zoom is a performance analysis tool for applications running on the Linux and Mac OS X operating systems from RotateRight. Using statistical (event-based) profiling, this software diagnoses performance problems related to cpu- and memory-intensive program code. == Statistical Sampling == Statistical sampling is the periodic recording of a processor's program counter or instruction pointer. * Each sample is taken (triggered) after a fixed period of time has elapsed or set number of events has occurred. In this way samples are taken in code proportionate to where more time is spent or more events occur. * Statistical sampling can be either system-wide or target a specific process. System-wide sampling captures all of the processes running on a system, and can include time spent in kernel or driver code as well. Process-targeted sampling can be used to understand time spent waiting for I/O or kernel work. * Additional information besides the program counter can be recorded at each interval. For example, other hardware performance counters can be read or the entire function callstack can be recorded. Recording the stack is important because it allows the developer to know not only where time was spent (or events occurred), but also how that code was called. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「RotateRight Zoom」の詳細全文を読む スポンサード リンク
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