Ghostscript to the rescue! Available in every UNIX/Linux distribution, you can leverage the gs command to do this.

gs -sDEVICE=pdfwrite -dNOPAUSE -dBATCH -dSAFER /
   -dFirstPage=7 -dLastPage=27 /
   -sOutputFile=name_of_outfile.pdf name_of_inputfile.pdf

If you use Ubuntu, the installation is very simple:

sudo apt-get install apache2-utils

I used this tool to benchmark NeoQuotes application, testing how Jetty with JRuby-Rack are performing against multiple concurrent requests.

First, start up Jetty with mvn jetty:run or with the command defined in project Procfile (sh target/bin/jruby -S config/jetty.rb for NeoQuotes).

Next, execute multiple times the following command:

ab -n 10000 -c 25 http://localhost:8080/

where n = number of requests and c = concurrency level.

Is worth to look to the number of requests per second, that are increasing every time the benchmark is executed. This happens thanks to JIT!

Below some results after running ab -n 10000 -c 25 http://localhost:55012/ three times in a commodity hardware (all tests were performed on the application homepage where there is no interaction with Neo4j and no cache mechanism is configured):

First execution:

Time taken for tests:   73.162 seconds
Requests per second:    136.68 [#/sec] (mean)

Second execution:

Time taken for tests:   67.006 seconds
Requests per second:    149.24 [#/sec] (mean)

Third execution:

Time taken for tests:   65.725 seconds
Requests per second:    152.15 [#/sec] (mean)

Also, take a look at Min and Max threads of Jetty QueuedThreadPool, at config/jetty.rb configuration.

Depending of your hardware and your VM configuration,the more threads you configure into min and max, the worse your throughput gets when your VM starts to reach its resource limits.

1: $ netstat -anp | grep :port_number
2: (search manually the output for the PID that is using the given :port_number)
3: $ kill -9 :pid

Bored, I challenged my friend Alisson to build a command to perform those three steps, in one single line.

He came up with the following solution:

kill -9 $(sudo netstat -anp | grep :[port_number] | awk '{print $7}' | cut -d '/' -f 1)

Congratulations man! You deserve a very cold Heineken!

A JDK contém o plugin para o browser. Está localizado em:

<JDK>/jre/lib/i386/libnpjp2.so

Apenas um plugin do java pode ser utilizado pelo navegador. Portanto elimine qualquer link simbólico que aponte para javaplugin-oji.so e libnpjp2.so.

Feito isso, crie um link simbólico para o plugin distribuído com a JDK, utilizando o comando abaixo:

/usr/lib/firefox-addons/plugins$ sudo ln -s <JDK>/jre/lib/i386/libnpjp2.so

Reinicie o Firefox, e digite about:plugins na barra de endereços. Localize o plugin do java, confirmando a instalação.

1. Faça o download do .bin (jdk-6u<version>-linux-i586.bin) no site oficial da Oracle.
2. Execute o seguinte comando sobre o arquivo: $ chmod a+x jdk-6u<version>-linux-i586.bin
3. Agora com as devidas permissões configuradas, execute o arquivo: $ ./jdk-6u<version>-linux-i586.bin
4. Utilizando o comando mv, altere o local dos arquivos extraídos para por exemplo: /usr/local/java/jdk<version>
5. Crie um link simbólico para este diretório. Ex: /usr/local/java$ ln -s jdk<version>/ jdk
6. Exclua o arquivo .bin

Configurar a variável de ambiente $JAVA_HOME:

Abra o arquivo ~/.profile com o editor de sua preferência e adicione no final do arquivo:

JAVA_HOME=/usr/local/java/jdk
export JAVA_HOME

PATH="$JAVA_HOME/bin:$PATH"

obs.1: repare na utilização do link simbólico na variável de ambiente JAVA_HOME
obs.2: para executar alguns dos comandos listados serão necessárias permissões de super usuário.