jetbrains 系列IDE 是用java写的 佷吃内存 特别是你的项目目录很多很深的时候 例如 npm install --save很多包的时候 还会卡死

优化 其实就是利用Java的各种运行命令 来对程序进行优化

现在 让我们来看看 Java有哪些可以被我们使用的命令

bash 下输入

Ps:环境osx10.11.4 + java v1.8.0_92-b14

java

• 1

显示

Usage: java [-options] class [args...]
           (to execute a class)
   or  java [-options] -jar jarfile [args...]
           (to execute a jar file)
where options include:
    -d32      use a 32-bit data model if available
    -d64      use a 64-bit data model if available
    -server   to select the "server" VM
                  The default VM is server,
                  because you are running on a server-class machine.


    -cp <class search path of directories and zip/jar files>
    -classpath <class search path of directories and zip/jar files>
                  A : separated list of directories, JAR archives,
                  and ZIP archives to search for class files.
    -D<name>=<value>
                  set a system property
    -verbose:[class|gc|jni]
                  enable verbose output
    -version      print product version and exit
    -version:<value>
                  Warning: this feature is deprecated and will be removed
                  in a future release.
                  require the specified version to run
    -showversion  print product version and continue
    -jre-restrict-search | -no-jre-restrict-search
                  Warning: this feature is deprecated and will be removed
                  in a future release.
                  include/exclude user private JREs in the version search
    -? -help      print this help message
    -X            print help on non-standard options
    -ea[:<packagename>...|:<classname>]
    -enableassertions[:<packagename>...|:<classname>]
                  enable assertions with specified granularity
    -da[:<packagename>...|:<classname>]
    -disableassertions[:<packagename>...|:<classname>]
                  disable assertions with specified granularity
    -esa | -enablesystemassertions
                  enable system assertions
    -dsa | -disablesystemassertions
                  disable system assertions
    -agentlib:<libname>[=<options>]
                  load native agent library <libname>, e.g. -agentlib:hprof
                  see also, -agentlib:jdwp=help and -agentlib:hprof=help
    -agentpath:<pathname>[=<options>]
                  load native agent library by full pathname
    -javaagent:<jarpath>[=<options>]
                  load Java programming language agent, see java.lang.instrument
    -splash:<imagepath>
                  show splash screen with specified image
See http://www.oracle.com/technetwork/java/javase/documentation/index.html for more details.

• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• 13
• 14
• 15
• 16
• 17
• 18
• 19
• 20
• 21
• 22
• 23
• 24
• 25
• 26
• 27
• 28
• 29
• 30
• 31
• 32
• 33
• 34
• 35
• 36
• 37
• 38
• 39
• 40
• 41
• 42
• 43
• 44
• 45
• 46
• 47
• 48
• 49
• 50
• 51
• 52

查看一些高级的命令

java -X

• 1

显示

-Xmixed           mixed mode execution (default)
    -Xint             interpreted mode execution only
    -Xbootclasspath:<directories and zip/jar files separated by :>
                      set search path for bootstrap classes and resources
    -Xbootclasspath/a:<directories and zip/jar files separated by :>
                      append to end of bootstrap class path
    -Xbootclasspath/p:<directories and zip/jar files separated by :>
                      prepend in front of bootstrap class path
    -Xdiag            show additional diagnostic messages
    -Xnoclassgc       disable class garbage collection
    -Xincgc           enable incremental garbage collection
    -Xloggc:<file>    log GC status to a file with time stamps
    -Xbatch           disable background compilation
    -Xms<size>        set initial Java heap size
    -Xmx<size>        set maximum Java heap size
    -Xss<size>        set java thread stack size
    -Xprof            output cpu profiling data
    -Xfuture          enable strictest checks, anticipating future default
    -Xrs              reduce use of OS signals by Java/VM (see documentation)
    -Xcheck:jni       perform additional checks for JNI functions
    -Xshare:off       do not attempt to use shared class data
    -Xshare:auto      use shared class data if possible (default)
    -Xshare:on        require using shared class data, otherwise fail.
    -XshowSettings    show all settings and continue
    -XshowSettings:all
                      show all settings and continue
    -XshowSettings:vm show all vm related settings and continue
    -XshowSettings:properties
                      show all property settings and continue
    -XshowSettings:locale
                      show all locale related settings and continue

The -X options are non-standard and subject to change without notice.


The following options are Mac OS X specific:
    -XstartOnFirstThread
                      run the main() method on the first (AppKit) thread
    -Xdock:name=<application name>"
                      override default application name displayed in dock
    -Xdock:icon=<path to icon file>
                      override default icon displayed in dock

• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• 13
• 14
• 15
• 16
• 17
• 18
• 19
• 20
• 21
• 22
• 23
• 24
• 25
• 26
• 27
• 28
• 29
• 30
• 31
• 32
• 33
• 34
• 35
• 36
• 37
• 38
• 39
• 40
• 41
• 42

从中抽取一些有用的命令

-d64  #选择以64位Java运行 //@todo 检查你系统的Java是64还是32的 再使用此项
-server #选择以服务器的模式运行Java程序
-Xincgc #启用增量垃圾收集
-Xms <大小> #设置初始Java堆大小
-Xmx <大小> #设置最大Java堆大小
-Xss <大小> #设置Java线程堆栈大小

• 1
• 2
• 3
• 4
• 5
• 6

编辑你使用的ide的配置文件

本人的系统osx 10.11.4

IDE为webstrom

ps:如果你想编辑全局的配置文件

bash

进入ide的安装文件夹的bin目录

cd /Applications/WebStorm.app/Contents/bin

• 1

目录如下

fsnotifier              java_pid12702.hprof     libbreakgen64.dylib     log.xml
idea.properties         libMacNativeKit64.dylib libbreakgen64.jnilib    printenv.py
inspect.sh              libbreakgen.dylib       libyjpagent.dylib       restarter
java_pid11040.hprof     libbreakgen.jnilib      libyjpagent.jnilib      webstorm.vmoptions

• 1
• 2
• 3
• 4

使用编辑器编辑webstorm.vmoptions即可

编辑IDE本地配置

bash下输入下面命令 进入本地配置文件夹

cd ~/Library/Preferences/WebStorm2016.1

• 1

你会看到这样的目录

colors               idea.properties      options              tasks
disabled_plugins.txt inspection           port                 templates
disabled_update.txt  javascript           port.lock            webstorm.vmoptions
fileTemplates        jvm.md               settings.jar         webstorm120.key

• 1
• 2
• 3
• 4

编辑配置文件webstorm.vmoptions

楼主使用是sublime text 3

subl ./webstorm.vmoptions

• 1

原版的配置文件是这样的

#origin
-Xms128m
-Xmx750m
-XX:MaxPermSize=350m
-XX:ReservedCodeCacheSize=240m
-XX:+UseCompressedOops

• 1
• 2
• 3
• 4
• 5
• 6

修改成这样

#modify
-d64 # #此项根据你实际Java版本设置 //@TODO 建议升级java x64
-server
-Xms2048m #此项根据你实际内存大小设置 本人8g
-Xmx4096m  #此项根据你实际内存大小设置 本人8g
-XX:MaxPermSize=1024m   #此项根据你实际内存大小设置 本人8g
-XX:ReservedCodeCacheSize=1024m  #此项根据你实际内存大小设置 本人8g
-XX:+UseCompressedOops
-Xss4m
-ea
-Dsun.io.useCanonCaches=false
-Djava.net.preferIPv4Stack=true
-XX:+UseCodeCacheFlushing
-XX:+UseConcMarkSweepGC
-XX:SoftRefLRUPolicyMSPerMB=50
-XX:MinHeapFreeRatio=15
-Xincgc

• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• 13
• 14
• 15
• 16
• 17

开始你的code吧!!