SwingUtilities.updateComponentTreeUI(this); will reset your own UI, if you call setUI() in constructor. Example: PeterCustomeTabbedPane ----- extend ------> MaryCustomTabbedPane ----  extend ->   JTabbedPane (swing component) Suppose PeterCustomeTabbedPane and MaryCustomTabbedPane have their own TabbedPaneUI, once you called SwingUtilities.updateComponentTreeUI(this); , PeterCustomeTabbedPane's UI class will be reset to MaryCustomTabbedPane's UI class. Workaround: !!! dont call setUI in PeterCustomeTabbedPane, override the setUI() method and set whatever […] 2013/10/13

I am playing the gdbstub in qemu, i found a bug there http://peter.kingofcoders.com/?p=859 , if i invoke the function cpu_physical_memory_rw(0xffff0, mem_buf, 50, 0) , qemu crashes. Then, i tested the gdb command "x /20bx 0xffff0" and use tcpflow to capture the gdb packet, i found out gdb send 20 command and each time request one byte only. […] 2013/10/08

I found a bug in qemu, version 1.6.0 rc2. When i invoke: where addr=0xffff0 and noOfBytes=50, qemu will has segmentation fault. I called the cpu_physical_memory_rw right after the qemu is started (haven't run yet) with gdb. The vm was in real mode, i am not sure it is crossing memory boundary problem. But i just […] 2013/10/07

enable core dump in mac, you need these commands The core dump files are in /cores by default 2013/10/06

QMP Supported Commands:   This document describes all commands currently supported by QMP. Most of the time their usage is exactly the same as in the user Monitor, this means that any other document which also describe commands (the manpage, QEMU's manual, etc) can and should be consulted. QMP has two types of commands: regular […] 2013/09/22

JLibGDB need 335 mins to send 10 millions single step commands to gdb and execute. Not bad. 2013/08/22

Stream to a mp4 Stream to a FLV  Stream to a HLS 2013/08/22

In bochs, i can invokes around 40 single step commands in my 2012 mac air. People think qemu is much faster than bochs, it is truth but not for single step. I wrote a java program and keep sending single-step command to qemu through socket (GDB protocol, the average speed is 32 commands per seconds. […] 2013/08/18

I was trying to create a new debug server in qemu, but it is failed, there are so many pieces of code are twitted with GDB, so a new debug server is unable to make it work. Now I changed my direction, because on gdb communication protocol, i extend it to fit for peter-bochs (will […] 2013/08/15

This is my first draft of design concept of the VM page in Titan, please give me comment PSD download here 2013/08/03

If the openstack is down when you start titan server, it will show you the status. 2013/08/03

Going to develop this network montior/setup screen. 2013/07/28

The cloud computing industry is still young relative to the history of computing, but increasingly, speculators are in a rush to declare a “winner.” Of course, based on certain metrics it's possible to identify leaders. But we certainly don’t think the game is over, and we were pleased to see that Charlie Babcock of InformationWeek agrees with […] 2013/07/23

$tcpflow -c -i lo0 port 1234 tcpflow[5508]: 127.000.000.001.01234-127.000.000.001.58366: new flow 127.000.000.001.58366-127.000.000.001.01234: + 127.000.000.001.58366-127.000.000.001.01234: $qSupported:multiprocess+;xmlRegisters=i386;qRelocInsn+#b5 127.000.000.001.01234-127.000.000.001.58366: + 127.000.000.001.01234-127.000.000.001.58366: $PacketSize=1000#f1 127.000.000.001.58366-127.000.000.001.01234: + 127.000.000.001.58366-127.000.000.001.01234: $Hg0#df 127.000.000.001.01234-127.000.000.001.58366: + 127.000.000.001.01234-127.000.000.001.58366: $OK#9a 127.000.000.001.58366-127.000.000.001.01234: + 127.000.000.001.58366-127.000.000.001.01234: $?#3f 127.000.000.001.01234-127.000.000.001.58366: + 127.000.000.001.01234-127.000.000.001.58366: $T05thread:01;#07 127.000.000.001.58366-127.000.000.001.01234: + 127.000.000.001.58366-127.000.000.001.01234: $Hc-1#09 127.000.000.001.01234-127.000.000.001.58366: + 127.000.000.001.01234-127.000.000.001.58366: $OK#9a 127.000.000.001.58366-127.000.000.001.01234: + 127.000.000.001.58366-127.000.000.001.01234: $qC#b4 127.000.000.001.01234-127.000.000.001.58366: + 127.000.000.001.01234-127.000.000.001.58366: $QC1#c5 127.000.000.001.58366-127.000.000.001.01234: + 127.000.000.001.58366-127.000.000.001.01234: $qAttached#8f 127.000.000.001.01234-127.000.000.001.58366: […] 2013/06/16

This is the flowchart for qemu-gdb after i insert two breakpoints at 0x7c00 and 0x7c01, you can see everytime gdb hit a breakpoints, it will remove all breakpoints. And if the current address is the address that hit the breakpoint, when you want to "cont", gdb will send a "s" command first. 2013/06/12

if you are create your own debug server,  gdb will crash, take a look: Program received signal SIGSEGV, Segmentation fault. [Switching to Thread 0x7fffebfff700 (LWP 32202)] 0x000055555577632b in gdb_set_stop_cpu (env=env@entry=0x5555564f6d20) at /root/workspace/qemu-1.5.0/gdbstub.c:2510 2510 gdbserver_state->c_cpu = env; Missing separate debuginfos, use: debuginfo-install SDL-1.2.15-3.fc18.x86_64 cyrus-sasl-lib-2.1.23-37.fc18.x86_64 glib2-2.34.2-2.fc18.x86_64 glibc-2.16-28.fc18.x86_64 libX11-1.5.0-3.fc18.x86_64 libXau-1.0.6-4.fc18.x86_64 libXcursor-1.1.13-2.fc18.x86_64 libXext-1.3.1-2.fc18.x86_64 libXfixes-5.0-3.fc18.x86_64 libXrandr-1.4.0-1.fc18.x86_64 libXrender-0.9.7-2.fc18.x86_64 libpng-1.5.13-1.fc18.x86_64 libxcb-1.9-1.fc18.x86_64 nss-softokn-freebl-3.14.3-1.fc18.x86_64 […] 2013/06/12

I found a bug for the tightvnc java library, if my setup like this tightvnc (java) -> java proxy server -> java proxy server -> vnc server IT doesn't work, after I trace the code, this could caused by this line: this.is = new DataInputStream(new BufferedInputStream(is)); In Reader.java constructor, it is called twice. You can see that if you […] 2013/05/28

test : PB -> C -> catch breakpoint -> C C -> catch breakpoint -> N x Si -> C restart Qemu refactor all the equals("bochs") code to LibGKD better to use enum for bochs/qemu enhance profiling feature for vnc recording Here is the list of gdb command: (gdb) help all   Command class: aliases […] 2013/05/25

I use Tightvnc java library to display the qemu screen in GKD. The tightvnc java library is able to display in a JFrame/JApplet, but not in a JPanel, so I modified it to make it work in a JPanel, all the code is in , take a look the function initVNCPanel() 2013/05/21

After a few hours hack into the tightvnc code, i can display the vnc onto a JPanel, i will replace the buggy novnc with my own vnc proxy server, so user don't need to setup the novnc for openstack but able to remote to every instance using openstack. PeterIPasswordRetriever.java: 2013/05/20

when running tightvnc java viewer, add parameter "-password=mypassword myhost:9401" change line 181 in Viewer.java, from to 2013/05/19

This is the script i use to restart the devstack, i am using it with ubuntu 12.10 64 bits and devstack restart_devstack.sh 2013/05/17

Samsung galaxy s4, charging the battery, using samsung USB cable is much faster than third-party usb cable, here is my test 1) samsung power adapter + samsung usb cable, charge from 10% to 30% takes 20 minutes 2) samsung power adapter + third-party 3M-long usb cable, charge from 10% to 30% takes 1 hour and 15 […] 2013/05/13

converted LibGKD to maven project, because peter-swing is now a maven project, better to convert it too 2013/05/12

my colleague Thomas discovered that if we send two commands to openstack using the curl to get the same token, the expiry will keep changing to later time. This will cause the token never expire. 2013/05/07

There is a western friend told me he can't use peter-dwarf to parse his 64 bits elf file, after i trace my code, i finally found my peter-dwarf library only support 32 bits elf. I need some time to enhance it and make it 64 bits. 2013/04/26

I have a ubuntu 12.10 64 bits, i can easily install devstack, but there are some points still need to care about the devstack 1. Devstack installation script is to git clone the latest version from the openstack source repository, if the repository's code contain bug, your openstack will fail. If you use devstack in […] 2013/04/24

steps to reinstall devstack 1) Remove all the openstack;s databases from mysql, glance, keystone, nova, etc... 2) Delete the install directory of devstack, default is /opt/stack 3) Remove your old devstack git clone directory, because we want to check out the latest code 4) You *don't* need to delete /usr/local/lib/python2.7/distpackages/openstack* , but if you did […] 2013/04/22

Let's beat vSphere using openstack, first step is to learn everything from it o VMware vSphere 5 Evaluation Guide - Volume1 VMware-vSphere-Evaluation-Guide-1 o VMware vSphere 5 Evaluation Guide - Volume 2 - Advance Storage Features VMware-vSphere-Evaluation-Guide-2-Advanced-Storage o VMware vSphere 5 Evaluation Guide - Volume 3 - Advance Networking Features VMware-vSphere-Evaluation-Guide-3-Advanced-Networking o VMware vSphere 5 Evaluation […] 2013/04/17

A very professional ppt that talk about system performance tuning download : scalelinuxperformance-130224171331-phpapp01 2013/04/17

I and my colleague are currently develop some modules on openstack dashboard. Here is the list for you to know : when you modify a page in dashboard, which files you need to deal with, this will save you some time: download : openstack_dashboard 2013/04/12

If you install openstack by devstack, when you reboot your server and restart the openstack by this script http://www.scalegrid.net/blog/?p=52, when you browse to the dashboard and you will see this error message "HTTPConnectionPool(host='192.168.100.170', port=8776): Max retries exceeded with url: /v1/b721f5b1f7cd43dd83ee573f6d4e6c74/os-quota-sets/b721f5b1f7cd43dd83ee573f6d4e6c74 (Caused by <class 'socket.error'>: [Errno 111] Connection refused)" You should check with your endpoints server […] 2013/04/09

Correct me if i am wrong. Openstack components (nova, cinder, glance) controls libvirt to provide visualization and libvirt use qemu-kvm as the hypervisor. The reason openstack don't control the qemu-kvm directly is because libvirt provides better cross VM functionality (it can adopt to xen, vmware, etc...) and it provides high-end function such pool management and […] 2013/03/29

to put python+django to apache through virtualhost 1) edit /etc/httpd/conf/httpd.conf 2) edit /root/workspace/MyDjangoProject/P1/wsgi.py, change it to 2013/03/26

error in manage.py createsuperuser To solve the above issues, type in 2013/03/26

When you set the breakpoint by input the "b" command, the gdb will not set it immediately, it will wait until the user pressed "c" to cont execute the program. After you pressed "c", gdb will set all the breakpoints for you. The most funny thing is : when gdb hit a breakpoint and gain […] 2013/03/23

If you are developing a debug server for qemu, after qemu hit a breakpoint, your server have to remove the breakpoint manually and re-insert it after the cpu passed that EIP, otherwise the cpu will forever stay in the EIP and can't single-step/cont to the next instruction. If you take a look the gdbstub.c, gdb […] 2013/03/21

I just tested the qemu-kvm with QMP, when i send out the qmp command for migration, it takes 20 seconds, it is much slower than type in the command in qemu monitor. 2013/03/21

To use qmp and send command to qemu from another process, start qemu by This will create a file /tmp/test.gmp for interchange the command. Then you can start another terminal and invoke command.txt: !!! remark, must invoke { "execute": "qmp_capabilities" } before invoke any qmp command 2013/03/20

When you are running vm in virtual box, and try to start any vm in openstack. The vm that are running in virtualbox will crash immediately, you need to do the follow command to shut it down. If you want to restart that VM, please rmmod the kvm module. I guess is that the kvm […] 2013/03/17