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dicas:r-compila [2011/11/03 22:44] paulojus |
dicas:r-compila [2011/11/11 14:24] paulojus |
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| + | |||
| + | == Sobre compilação e pacotes == | ||
| + | |||
| + | R-2.14.0 comes with Luke Tierney's byte-compiler installed. Byte-compilation can speed up R computations by | ||
| + | a factor 5, although if your functions are just calls to compiled C code the speedup will be much | ||
| + | smaller. By default, only the required packages are byte-compiled. But if you set (in your bash profile) | ||
| + | |||
| + | export R_COMPILE_PKGS=1 | ||
| + | |||
| + | then all packages will byte-compile when installed. If you set | ||
| + | |||
| + | export R_ENABLE_JIT=3 | ||
| + | |||
| + | then all functions you define in your interactive or batch session will be byte-compiled the first time they | ||
| + | are entered into the workspace (and the same is true for all loops). \\ | ||
| + | It should be noted that some contributed packages have namespace problems when byte-compiled. | ||
| + | |||
| + | R-2.15.0 (i.e. R-devel) has parallel versions of Map() and mapply(). parallel makes fork or socket | ||
| + | cluster and has parallel random number generation. MPI clusters are handled (for now) by passing the | ||
| + | information to the snow package. | ||
