> of Intel Itanium2 clusters for bioinformaticians to crank their data.
> optimizing their performance. I'm using Intel C/C++ compiler on this > platform running Linux. One of my findings is that turning some > functions in R to "inline" functions boost performance significantly. > > While R follows strict C89 standard right now, there're quite some good > reasons to relax the rule somewhat. From my experience in software > In R, there are quite some simple functions that are called extremely > often, such as "R_IsNaNorNA", "R_finite", etc. They are used in heavy > loops quite a lot. They disrupt the pipelining, and negatively affect > the performance of the software. For instance, on IA64, system call of > "isnan" cost 4 cycles, while a wrapper like "R_IsNaNorNA" could cost > several times more. if the Itanium2 optimizes badly for standard C89 code, that's the processor architecture's fault, not R's. you probably need either better (smarter) compilers or a different platform, not 'improvements' to R. what would the impact of inlining these functions be on all of the other architectures (PPC, sparc, Opteron, x86, etc) where R currently runs perfectly well? --elijah ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-devel
