This is one is quick but very helpful
ls -laR | wc -l
With that, you will count all files under the current and subdirectories.
Monthly Archives: October 2008
Well, I heard (read to be honest) somewhere that ext4, the evolution of ext3 linux file system, is coming out from development to stable tree (Kernel 2.6.28). However, I was not so sure about the benefits and how this can improve my life and my performance in daily tasks using my 80gb HD laptop. Here is the features I found in my search:
- Large filesystem: It can support volumes with sizes up to 1 exabyte (1024 GB == 1 Tera. 1024 Tera == 1 Peta. 1024 Peta == 1 Exa). Since Linux kernel version 2.6.25, it also supports files as large as the file system.
- Backward and forward compatibility: It has backward compatible with ext3, making it possible to mount an ext3 filesystem as ext4 and vice-versa, but the ext4 to ext3 is only possible if extents is not enabled.
- Delayed allocation: With this feature, ext4 can delay block allocation as long as possible, improving performance and reducing fragmentation, since it will only allocate space with the real file size.
- Expand the subdirectory limit up to 64000: Shame on you Window$
- Faster file system checking: The data structures used in ext4 allows fsck to skip unused blocks of data, which will reduce the time fsck may spend.
- Undelete: It’s not yet implemented but this feature will also be supported and it’s very handy in many situations.
- Other fixes…
But the discussion here: is it really for you ? Do you need a filesystem with 1 exabyte limit ? Create more than 32,000 subdirectories ? I mean, of course that there are other performance improvements and they are very important and welcome, thanks. But I’m not so sure about experiment ext4 now, since I’m only with one machine and using it for work. 
Maybe in few months or with the next Ubuntu release I’ll have it. At least, I’m already aware of what I can expect about ext4.
For those who want’s to migrate from ext3 to ext4 now, I found this step-by-step article at IBM developerWorks and looks very helpful.
Sources:– http://ext4.wiki.kernel.org/index.php/Main_Page
- http://en.wikipedia.org/wiki/Ext4
For those who needs to look at some huge log files (usually generated by Java servers such as weblogic, tomcat or jboss…) or needs to check thread dumps (stuck thread sucks) here goes a great tool: TDA (Thread Dump Analyzer).
In a JEE architecture we have a daily work with multi-thread environments. All applications (or most of them) needs to run in cluster and share the load between many machines, domains, work managers or threads. In such scenarios, it’s important to identify which class made a thread stuck ? What’s going on in the JVM in the moment the application stops working and freeze. In such situations, you can take a look at the thread dump. But what is a thread dump ? In few words: a textual dump of all active threads and monitors of Java apps running in a Virtual Machine.
Of course there are much more to say about thread dumps, but today I’m just posting about a tool that can helps working thread dumps and some server side logs… TDA! (not a sound)
Here are the new features listed from TDA home:
- Tool now is available as VisualVM plugin.
- Skip broken thread dumps.
- Custom Thread Categories.
- New Welcome Screen.
- Small Adjustments to support SAP JVM Dumps (slightly modified from SUN Dumps).
- Small Adjustments to support HP JVM DUmps (slightly modified from SUN Dumps).
ALDSP Version: 3.0.1
WLI Version: 9.2.2
OS: Ubuntu 8.0.4 (2.6.24-19-generic, x86_64)
Problem description: When you try to create a new DSPControl in a Process project (WLI), after the settings (remote context, ip, application name, etc…) you select which data service you want this control to call. After that, click on finish. I’ve just got an error message saying that Workshop try to create a directory called /tmpcontrolxsd1223392115385/classes/apache_schemaorg_xml. The directory name changes each time you click on finish.. But the point is, WHY ? WHY Workshop need to create that in the root directory ? Under / ? Come on… Doesn’t make sense and I didn’t find a way to setup that.
Dirt-quick workaround: Run workshop with sudo permission or give write permission on / to the user that you are running workhsop. I prefer the first one, but I’ll research about this bug and try to figure out another way to do that…
Legal, chegou meu login no site da Scrum Alliance me dando direito a alguns materiais restritos sobre Scrum, e claro o meu certificado por ter feito o curso. Mas, acho legal comentar que concordo com os diversos posts da web sobre certificações em desenvolvimento ágil, inclusive o do Felipe Shoes que é um dos melhores, citando a famosa “Fastest Agile Certification on the Web” -> *Agile Software Specialist*. (Tire a sua clicando aqui)
Concordo que em diversos casos a coisa é muito banalizada e infelizmente, por ter a palavra “Certified” no título do curso, muitos gerentes de projetos do tipo PMP (Piloto de Microsoft Project) utilizam mais este título, apenas para somar ao tradicional “PMP” da assinatura do e-mail, mais uma certificação. Read More »
