本文整理汇总了Java中org.lwjgl.LWJGLUtil.getPrivilegedInteger方法的典型用法代码示例。如果您正苦于以下问题：Java LWJGLUtil.getPrivilegedInteger方法的具体用法？Java LWJGLUtil.getPrivilegedInteger怎么用？Java LWJGLUtil.getPrivilegedInteger使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类org.lwjgl.LWJGLUtil的用法示例。
在下文中一共展示了LWJGLUtil.getPrivilegedInteger方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Java代码示例。
示例1: getCacheLineSize
import org.lwjgl.LWJGLUtil; //导入方法依赖的package包/类
static int getCacheLineSize() {
final int THREADS = 2;
final int REPEATS = 100000 * THREADS;
final int LOCAL_REPEATS = REPEATS / THREADS;
// Detection will start from CacheLineMaxSize bytes.
final int MAX_SIZE = LWJGLUtil.getPrivilegedInteger("org.lwjgl.util.mapped.CacheLineMaxSize", 1024) / 4; // in # of integers
// Detection will stop when the execution time increases by more than CacheLineTimeThreshold %.
final double TIME_THRESHOLD = 1.0 + LWJGLUtil.getPrivilegedInteger("org.lwjgl.util.mapped.CacheLineTimeThreshold", 50) / 100.0;
final ExecutorService executorService = Executors.newFixedThreadPool(THREADS);
final ExecutorCompletionService<Long> completionService = new ExecutorCompletionService<Long>(executorService);
try {
// We need to use a NIO buffer in order to guarantee memory alignment.
final IntBuffer memory = getMemory(MAX_SIZE);
// -- WARMUP --
final int WARMUP = 10;
for ( int i = 0; i < WARMUP; i++ )
doTest(THREADS, LOCAL_REPEATS, 0, memory, completionService);
// -- CACHE LINE SIZE DETECTION --
long totalTime = 0;
int count = 0;
int cacheLineSize = 64; // fallback to the most common size these days
boolean found = false;
for ( int i = MAX_SIZE; i >= 1; i >>= 1 ) {
final long time = doTest(THREADS, LOCAL_REPEATS, i, memory, completionService);
if ( totalTime > 0 ) { // Ignore first run
final long avgTime = totalTime / count;
if ( (double)time / (double)avgTime > TIME_THRESHOLD ) { // Try to detect a noticeable jump in execution time
cacheLineSize = (i << 1) * 4;
found = true;
break;
}
}
totalTime += time;
count++;
}
if ( LWJGLUtil.DEBUG ) {
if ( found )
LWJGLUtil.log("Cache line size detected: " + cacheLineSize + " bytes");
else
LWJGLUtil.log("Failed to detect cache line size, assuming " + cacheLineSize + " bytes");
}
return cacheLineSize;
} finally {
executorService.shutdown();
}
}