Profiling with YourKit

To install yourKit, download the bz2 and untar it -
tar xjvf yjp-9.0.7-linux.tar.bz2

If you want to profile a web application running on say Tomcat,
1. You should upload the yourkit to one of the accessible folders on the server.
2. your catalina.sh or setenv.sh should have:
# enable YourKit java profiling.
CATALINA_OPTS_YJP="-agentpath:/home/tom8080/yjp-9.0.9/bin/linux-x86-64/libyjpagent.so"
When you start the application, in the logs yjp will log a line saying on which port it is listening. Use that port when connecting from the local box UI.

Start the application

Connect and then start profiling. End and save to get the snapshot.

Cisco anyconnect vpn client on ubuntu 10

sudo apt-get install ia32-libs lib32nss-mdns libcurl3 libxml2
cd /usr/local
sudo mkdir firefox
cd firefox
sudo ln -s /usr/lib32/libnss3.so
sudo ln -s /usr/lib32/libplc4.so
sudo ln -s /usr/lib32/libnspr4.so
sudo ln -s /usr/lib32/libsmime3.so
sudo ln -s /usr/lib32/nss/libsoftokn3.so
sudo ldconfig

sudo sh ./vpn_install.sh

Adding new monitor resolution to Ubuntu

Follow these steps if your ubuntu monitor settings does not contain the resolution that your monitor supports.

Go to /etc/X11/
vi the file xorg.conf

my ubuntu did had the resolution - 1920x1080 so I had to add this file:

# xorg.conf (X.Org X Window System server configuration file)
#
# This file was generated by dexconf, the Debian X Configuration tool, using
# values from the debconf database.
#
# Edit this file with caution, and see the xorg.conf manual page.
# (Type "man xorg.conf" at the shell prompt.)
#
# This file is automatically updated on xserver-xorg package upgrades *only*
# if it has not been modified since the last upgrade of the xserver-xorg
# package.
#
# Note that some configuration settings that could be done previously

# in this file, now are automatically configured by the server and settings
# here are ignored.
#
# If you have edited this file but would like it to be automatically updated
# again, run the following command:
# sudo dpkg-reconfigure -phigh xserver-xorg

Section "Monitor"
Identifier "Configured Monitor"
EndSection

Section "Screen"
Identifier "Default Screen"
Monitor "Configured Monitor"
Device "Configured Video Device"
SubSection "Display"
Depth 24
Modes "1920x1080"
EndSubSection
EndSection

Section "Device"
Identifier "Configured Video Device"
EndSection


-- Installing Intel HD graphics card --
You need to install drivers for the graphics card. Here are the steps for Intel HD graphics card:
sudo add-apt-repository ppa:glasen/intel-driver
sudo apt-get update && sudo apt-get upgrade

-- Change grub ----
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
to
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i915.modeset=1"

in /etc/default/grub

run update-grub after making these changes & reboot.

-- run --
Run the below command:
cvt 1920 1080 60

This should output correct line to be used in xorg.conf
Here is the out put:
# 1920x1080 59.96 Hz (CVT 2.07M9) hsync: 67.16 kHz; pclk: 173.00 MHz
Modeline "1920x1080_60.00" 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync

$ xrandr --newmode "1920x1080_60.00" 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync

$ xrandr --addmode VGA1 1920x1080_60.00

Thrift Installation

Thrift

Thrift is a framework for cross-language services development. It has less documentation and the documentation you will find is for implementing the services. Data is transferred over http in binary form. We can use the serialization it does for caching. So instead of passing it over the wire we will put the serialized data in our cachepage.
How Thrift works is :
Create thrift definition files.
Compile the files to get client and server codes.
Compiled code will have methods to get or set the serialized object.

Languages Supported

* C++
* C#
* Cocoa
* Erlang
* Haskell
* Java
* OCaml
* Perl
* PHP
* Python
* Ruby
* Smalltalk

Compare this with ProtocolBuffers, which supports : C++, Java, Python

You will find interesting comparison with protoBufs at this page : http://stuartsierra.com/2008/07/10/thrift-vs-protocol-buffers

Serialization

Can serialize from and to binary or JSON . http://wiki.apache.org/thrift/ThriftUsageJava

Binary

TSerializer serializer = new TSerializer(new TBinaryProtocol.Factory());
byte[] bytes = serializer.serialize(work);

TDeserializer deserializer = new TDeserializer(new TBinaryProtocol.Factory());
Work moreWork = new Work();
deserializer.deserialize(moreWork, bytes);

JSON

TSerializer serializer = new TSerializer(new TSimpleJSONProtocol.Factory());
String json = serializer.toString(work);

Thrift Definition File

Objects are defined as Structures.
Structure can contain other structures. - same as in Protocol Buffers
Can contain methods that act on the members
* Can import files.
* supports inheritance
For the above to work, compile using special option.
Here it the [http://wiki.apache.org/thrift/Tutorial tutorial]
You can find more examples in the test folder of downloaded tar.

Services

Thrift definition files can have services. The compiler generates client and server code that provides RPC.
This is how Thrift can be used with [http://cassandra.apache.org/ cassandra] and [http://www.lexemetech.com/2008/07/rpc-and-serialization-with-hadoop.html Haddop]

Development Support

* IDE :
Eclipse and IntelliJ plugins have been out. But not sure if they work. Here is the link for [http://sourceforge.net/projects/thrift4eclipse/ Eclipse] and [http://incubator.apache.org/thrift/version_control.html IntelliJ]
* Maven :
out of the box Thrift is supported by ant.
But [http://github.com/dtrott/maven-thrift-plugin maven] plugin is availabile

References

* [http://incubator.apache.org/thrift/ Main Page]
* [http://incubator.apache.org/thrift/static/thrift-20070401.pdf WhitePage]

Installation

Ubuntu
sudo apt-get install libboost-dev automake libtool flex bison pkg-config g++

1. Download Thrift tar ball
http://incubator.apache.org/thrift/download/


2. unzip to /url/local/thrift
unzip /home/asulgaonkar/download/thrift-0.5.0.tar.gz

3. go to the root and read README
follow the instructions and do :

./configure

4. go to lib/java

ant

This will create thrift jar.

5. create thrift compiler

cd compile/cpp
make

How to run the thrift compiler ?

6. Make sure thrift is compiled, both the compiler and the Java library. You should
be able to verify the following:

thrift/tutorial/java$ file ../../lib/java/libthrift.jar
../../lib/java/libthrift.jar: Zip archive data, at least v1.0 to extract

if not do step 4.

thrift/tutorial/java$ file ../../compiler/cpp/thrift
../../compiler/cpp/thrift: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.15, not stripped

if not do step 5.

thrift/tutorial/java$ ls ../../lib/java/build/ivy/lib/
commons-lang-2.5.jar  junit-4.4.jar  servlet-api-2.5.jar  slf4j-api-1.5.8.jar  slf4j-simple-1.5.8.jar

7. Generate code for java:

thrift/tutorial/java$ cd ..
thrift/tutorial$ thrift -r -gen java tutorial.thrift

>> This will create gen-java
and folders inside it - shared and tutorial



8. Compile example

thrift/tutorial/java$ ant

This will compile the files that were generated


9. Run example:

thrift/tutorial/java$ ./JavaServer &
thrift/tutorial/java$ ./JavaClient

To prove that the serialization and de-serialization works
I modified client code to include following lines :

                TSerializer serializer = new TSerializer(new TBinaryProtocol.Factory());
                byte[] bytes = serializer.serialize(work);
                System.out.println("bytes : " + String.valueOf(bytes));
                System.out.println("Serialization Works!!");

                TDeserializer deserializer = new TDeserializer(new TBinaryProtocol.Factory());
                deserializer.deserialize(moreWork, bytes);
                System.out.println("De - Serialization Works!!" + moreWork.op + " on " + moreWork.num1 + " and " + moreWork.num2);

                TSerializer jsonSerializer = new TSerializer(new TSimpleJSONProtocol.Factory());
                String json = jsonSerializer.toString(moreWork);
                System.out.println("JSON " + json);