「javacpu占用率」java多线程cpu使用率低
今天给各位分享javacpu占用率的知识，其中也会对java多线程cpu使用率低进行解释，如果能碰巧解决你现在面临的问题，别忘了关注本站，现在开始吧！
本文目录一览：
java服务 cpu峰值和平均值 多少算正常
其实这个没有绝对的说法，说CPU使用多少算正常。
举个例子
如下图刚开的VPS，就算CPU使用50%也不正常。
通常情况下，如果你的cpu占用率在0%--75%之间变化，这个是正常的。但是要是经常在90%以上，甚至99.9%或者100%，那就算不正常。
Java程序CPU占用过高怎么解决
Java程序就是这样的，我去年做了一个桌面软件，也出现这样的问题，后来不用java的自动垃圾回收，在必要的时候手动调用System.gc(),这种情况就很少出现了，但是偶尔也还有。另外，CPU占用率过高的情况一般是编程的问题，重点考虑线程资源共享和网络流处理两个方面，java大部分的高CPU占用率都跟这两点有关系。
java怎样获取CPU占用率和硬盘占用率
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class T {
private static final int DRIVE_TYPE_HARD = 3;
private static final String CHARSET = "GBK";
private static final String CAP_LOAD_PERCENTAGE = "LoadPercentage";
private static final String CAP_CAPACITY = "Capacity";
private static final String CAP_CAPTION = "Caption";
private static final String CAP_DRIVE_LETTER = "DriveLetter";
private static final String CAP_DRIVE_TYPE = "DriveType";
private static final String CAP_FREE_SPACE = "FreeSpace";
private static final ListString CAPS_VOLUME = Arrays.asList(CAP_CAPACITY,
CAP_CAPTION, CAP_DRIVE_LETTER, CAP_DRIVE_TYPE, CAP_FREE_SPACE);
private static final String CMD_CPU = "wmic cpu get " + CAP_LOAD_PERCENTAGE;
private static final String CMD_VOLUME = "wmic volume get " + CAP_CAPACITY
+ "," + CAP_CAPTION + "," + CAP_DRIVE_LETTER + "," + CAP_DRIVE_TYPE + ","
+ CAP_FREE_SPACE;
public static void main(String[] args) throws IOException {
printDiskUsages(getDiskUsages());
printCpuUsage(getCpuLoadPercentage());
}
private static void printDiskUsages(ListDiskUsage diskUsages) {
for (DiskUsage diskUsage : diskUsages) {
System.out.printf("%s占用率：%.2f%%\n", diskUsage.caption, diskUsage.usage);
}
}
private static void printCpuUsage(double cpuLoadPercentage) {
System.out.printf("CPU占用率：%.2f%%\n", cpuLoadPercentage);
}
/**
* 取得 CPU 占用率。
*
* @return
* @throws IOException
*/
private static double getCpuLoadPercentage() throws IOException {
Process process = Runtime.getRuntime().exec(CMD_CPU);
InputStream is = process.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(is, CHARSET));
br.readLine(); // 舍弃标题行
br.readLine(); // 舍弃标题行下空行
String percentageLine = br.readLine();
if (percentageLine == null) {
return 0;
}
return Double.parseDouble(percentageLine.trim());
}
/**
* 取得硬盘占用率。
*
* @return
* @throws IOException
*/
private static ListDiskUsage getDiskUsages() throws IOException {
Process process = Runtime.getRuntime().exec(CMD_VOLUME);
InputStream is = process.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(is, CHARSET));
String captionLine = br.readLine(); // 舍弃标题行
br.readLine(); // 舍弃标题行下空行
MapString, Integer captionToIndex = parseVolumeCaptionLine(captionLine);
String line;
ListDiskUsage result = new ArrayListDiskUsage();
while ((line = br.readLine()) != null) {
if (line.length() == 0) {
// 舍弃空行
continue;
}
DiskUsage diskUsage = parseVolumeLine(line, captionToIndex);
if (diskUsage != null) {
result.add(diskUsage);
}
}
Collections.sort(result, new DiskUsageComparator());
return result;
}
private static MapString, Integer parseVolumeCaptionLine(String captionLine) {
MapString, Integer captionToIndex = new HashMapString, Integer();
for (String caption : CAPS_VOLUME) {
captionToIndex.put(caption, captionLine.indexOf(caption));
}
return captionToIndex;
}
private static DiskUsage parseVolumeLine(String line,
MapString, Integer captionToIndex) {
int driveType = parseVolumeDriveType(line, captionToIndex);
if (driveType != DRIVE_TYPE_HARD) {
return null;
}
String driveLetter = parseVolumeDriveLetter(line, captionToIndex);
if (!isValidDriveLetter(driveLetter)) {
return null;
}
String caption = parseVolumeCaption(line, captionToIndex);
long capacity = parseVolumeCapacity(line, captionToIndex);
long freeSpace = parseVolumeFreeSpace(line, captionToIndex);
return new DiskUsage(caption,
((capacity - freeSpace) / (double) capacity) * 100);
}
private static boolean isValidDriveLetter(String driveLetter) {
if (driveLetter.length() != 2) {
return false;
}
return Character.isUpperCase(driveLetter.charAt(0));
}
private static int parseVolumeDriveType(String line,
MapString, Integer captionToIndex) {
String str = line.substring(captionToIndex.get(CAP_DRIVE_TYPE),
captionToIndex.get(CAP_FREE_SPACE));
return Integer.parseInt(str.trim());
}
private static String parseVolumeDriveLetter(String line,
MapString, Integer captionToIndex) {
String str = line.substring(captionToIndex.get(CAP_DRIVE_LETTER),
captionToIndex.get(CAP_DRIVE_TYPE));
return str.trim();
}
private static String parseVolumeCaption(String line,
MapString, Integer captionToIndex) {
String str = line.substring(captionToIndex.get(CAP_CAPTION),
captionToIndex.get(CAP_DRIVE_LETTER));
return str.trim();
}
private static long parseVolumeCapacity(String line,
MapString, Integer captionToIndex) {
String str = line.substring(captionToIndex.get(CAP_CAPACITY),
captionToIndex.get(CAP_CAPTION));
return Long.parseLong(str.trim());
}
private static long parseVolumeFreeSpace(String line,
MapString, Integer captionToIndex) {
String str = line.substring(captionToIndex.get(CAP_FREE_SPACE));
return Long.parseLong(str.trim());
}
private static class DiskUsageComparator implements ComparatorDiskUsage {
@Override
public int compare(DiskUsage o1, DiskUsage o2) {
return o1.caption.compareTo(o2.caption);
}
}
private static class DiskUsage {
public String caption;
public double usage;
public DiskUsage(String caption, Double usage) {
this.caption = caption;
this.usage = usage;
}
}
}
java 怎么查看服务器的CPU使用率
1、确定当前系统安装的jdk是1.6版本以上
2、windows系统中有获取cpu使用率的可执行文件exe，只要在java中获取该文件的执行路径，通过Java调用即可。
3、获取操作系统可执行文件目录procCmd
4、调用java的Runtime.getRuntime().exec执行cmd应用程序
5、利用java中sleep来计算睡眠前后cpu的忙碌时间与空闲时间，因为sleep不会释放系统资源
6、根据忙碌时间占总时间的比例来计算cpu使用率！
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