Month: June 2017

1. Histograms (geom_histogram) display the count with bars;
   frequency polygons (geom_freqpoly), display the counts with lines.
2. how to remove extra base line in ggplot2-density plots? (https://groups.google.com/forum/#!topic/ggplot2/I3fXMH8foEs) ggplot(a,aes(x=V1))+geom_density() = ggplot(a,aes(x=V1))+geom_line(stat=”density”)

1. realVNC
2. TigerVNC
   
   1. 在被远程操控端安装TigerVNC服务器端 vncserver :3 #启动用户窗口（非root） 设置密码 2. 安装tigerVNC本地版：https://bintray.com/tigervnc/stable/tigervnc/1.8.0#files 3. 在使用端安装并运行TigerVNC客户端 输入ip:3 输入密码

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   1. 在被远程操控端安装TigerVNC服务器端   vncserver :3 #启动用户窗口（非root） 设置密码   2. 安装tigerVNC本地版：https://bintray.com/tigervnc/stable/tigervnc/1.8.0#files 3. 在使用端安装并运行TigerVNC客户端   输入ip:3 输入密码

3. teamviewer

1. configure file
   
   CXXFLAGS="-std=c++11 -O3" CFLAGS="-std=gnu++11 -O3"

   1 2	CXXFLAGS="-std=c++11 -O3" CFLAGS="-std=gnu++11 -O3"

2. foobar

Install local Perl

1. download source code

2. ./configure prefix=/path/to/directory

3. make -j 60

4. make -j 60 test

5. make -j 60 install DESTDIR=/path/to/dir

6. setup environment:

Install local packages

7. install local package

Document: http://docs.oracle.com/javase/6/docs/technotes/tools/windows/java.html

1. 查看各种参数默认值：java -XX:+PrintFlagsFinal
2. -Xmx: Specify the maximum size, in bytes, of the memory allocation pool. (MaxHeapSize)
   设置太小，程序一超过就会产生错误OOM：
   
   Exception in thread "main" java.lang.<strong>OutOfMemoryError</strong>: GC overhead limit exceeded

   1	Exception in thread "main" java.lang.<strong>OutOfMemoryError</strong>: GC overhead limit exceeded

3. -Xms: Specify the initial size, in bytes, of the memory allocation pool. (InitialHeapSize)
   设置太大，程序一运行就会产生错误：
   
   # There is insufficient memory for the Java Runtime Environment to continue. # Native memory allocation (mmap) failed to map 143165751296 bytes for committing reserved memory.# There is insufficient memory for the Java Runtime Environment to continue. # Native memory allocation (mmap) failed to map 143165751296 bytes for committing reserved memory. Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x00002b1f93400000, 143165751296, 0) failed; error='<strong>Cannot allocate memory</strong>' (errno=12)

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   # There is insufficient memory for the Java Runtime Environment to continue. # Native memory allocation (mmap) failed to map 143165751296 bytes for committing reserved memory.# There is insufficient memory for the Java Runtime Environment to continue. # Native memory allocation (mmap) failed to map 143165751296 bytes for committing reserved memory. Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x00002b1f93400000, 143165751296, 0) failed; error='<strong>Cannot allocate memory</strong>' (errno=12)

4. foobar