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我有一个大文件(类似3GB)并读入ArrayList中 当我运行下面的代码时,几分钟后代码运行速度非常缓慢,CPU使用率高。 几分钟后eclipse控制台显示错误java.lang.OutOfMemoryError:超出GC开销限制。在Java中读取大文件,速度太慢,超出gc开销限制
- OS:windows2008R2,
- 4杯,
- 32GB存储
- Java版本 “1.7.0_60”
的eclipse.ini
-startup
plugins/org.eclipse.equinox.launcher_1.3.0.v20130327-1440.jar
--launcher.library
plugins/org.eclipse.equinox.launcher.win32.win32.x86_64_1.1.200.v20140116-2212
-product
org.eclipse.epp.package.standard.product
--launcher.defaultAction
openFile
#--launcher.XXMaxPermSize
#256M
-showsplash
org.eclipse.platform
#--launcher.XXMaxPermSize
#256m
--launcher.defaultAction
openFile
--launcher.appendVmargs
-vmargs
-Dosgi.requiredJavaVersion=1.6
-Xms10G
-Xmx10G
-XX:+UseParallelGC
-XX:ParallelGCThreads=24
-XX:MaxGCPauseMillis=1000
-XX:+UseAdaptiveSizePolicy
Java代码:
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(new File("/words/wordlist.dat")));
InputStreamReader isr = new InputStreamReader(bis,"utf-8");
BufferedReader in = new BufferedReader(isr,1024*1024*512);
String strTemp = null;
long ind = 0;
while (((strTemp = in.readLine()) != null))
{
matcher.reset(strTemp);
if(strTemp.contains("$"))
{
al.add(strTemp);
strTemp = null;
}
ind = ind + 1;
if(ind%100000==0)
{
System.out.println(ind+" 100,000 +");
}
}
in.close();
我的使用情况:
neural network
java
oracle
solaris
quick sort
apple
green fluorescent protein
acm
trs
您能否详细说明您的用例?为什么在内存中需要3GB文件? – Mahendra
这是否需要将整个文件加载到内存中? – Devavrata
您可以通过在eclipse配置中设置'-XX:-UseGCOverheadLimi'来暂时防止此问题:[disable-the-usegcoverheadlimit-in-centos](http://stackoverflow.com/questions/18934146/disable-the-usegcoverheadlimit- in-centos) – Mahendra