Why Does Current Clustering Require Recoding?

AugstWest asks: "I've been doing some research into what the available clustering options are for pooling CPU resources, and it looks like most of the solutions I've found require that programs be re-written to take advantage of the cluster. Since there are virtualization apps like Bochs and VMWare, where the applications just make use of a virtual CPU as if it was a real CPU, why aren't there clustering solutions that do this as well?"

Comments

Compilers

[Marillion]

Most compilers/interpreters support languages designed for single thread execution. Fortran, COBOL, C, C++, Ruby, Perl, PHP, Java, ... Sure all these have API calls to make use of multiple threads, but the language itself isn't multi-threaded.

In my shameless search for a site to cite, I found this http://www-unix.mcs.anl.gov/dbpp/ which covers lots of problems that have to be solved.

I'd love to see a language (or language extension) cleanly define a way to let me define a code block attributes which could affect how and where it gets executed. The runtime library could then distribute that block as the environment best allows.