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It is well known that Node.js (Google’s V8) due to its non-blocking architecture can effectively handle thousands of requests per second being used as a web server. There’s also a huge number of IO intensive tasks that Node can easily cope with. I would like to know if every server task that we used to solve with Perl, Python or Ruby could be written in Node.js to run almost that fast. Or there’s a particular sort of tasks Node.js should be avoided for?
JavaScript itself should be avoided for computation intensive tasks (just like Perl, python and ruby should not do computation intensive tasks). These should be doing in C/C++ and possibly injected into node as a C++ addon
node.js should be avoided for blocking IO (You never need blocking IO, just do it non-blocking).
Other then that node.js is not a friendly environment for mission critical code (neither is Perl, python or ruby). For the record mission critical means, if your code breaks, people die.