iOS计算一段代码执行时间

CFAbsoluteTime startTime =CFAbsoluteTimeGetCurrent();

//在这写入要计算时间的代码

...

CFAbsoluteTime linkTime = (CFAbsoluteTimeGetCurrent() - startTime);

NSLog(@"Linked in %f ms", linkTime *1000.0);

打印出来为代码执行时间 单位ms

OpenGL ES 里面的一段代码

ep:

//START:link
- (BOOL)link

{

CFAbsoluteTime startTime =CFAbsoluteTimeGetCurrent();

GLintstatus;

glLinkProgram(program);

glGetProgramiv(program,GL_LINK_STATUS, &status);

if(status ==GL_FALSE)

returnNO;

if(vertShader)

{

glDeleteShader(vertShader);

vertShader=0;

}

if(fragShader)

{

glDeleteShader(fragShader);

fragShader=0;

}

CFAbsoluteTime linkTime = (CFAbsoluteTimeGetCurrent() - startTime);

NSLog(@"Linked in %f ms", linkTime *1000.0);

returnYES;

}