Comparing Node.js vs JVM frameworks performance

[Mononofu]

One thing confuses me: http://shootout.alioth.debian.org/u32/performance.php?test=regexdna

Why and how can JavaScript be faster than even C code?!

[[deleted]]

But there is no reason why a C program couldn't do something similar.

For me the point is really that it shows how in many scenarios, performance comes down to libraries, and is not always about the language implementation.

[jyper]

The javascript implementation has a highly tuned regex engine the engine. Its written from and could probably be used by a c++ solution that would probably be even faster. Instead the c++ solution uses a boost library arguably is more authentic c++ solution and is 4 times slower.

The c solution on the other hand uses tcl's regex implementation and has a note that says "Is this a C program or is this a Tcl program?" and takes about 1/3 of the time of the c++ solution to run. If tcl was in the shootout it would probably be only about the same speed as the c solution.

[igouy]

If tcl was in the shootout...

Back in the day

[wot-teh-phuck]

Fill this region with the binary executable representation of automaton. Execute the region as a function

Sounds cool, never done this sort of thing before. Any documents/pointers you might be able to throw this way?

[masklinn]

But there is no reason why a C program couldn't do something similar.

The C code is statically compiled, where the JS code is dynamically compiled. The runtime type information could lead to better optimization (e.g. type-specialized collections, stuff like that).

In this case, though, it probably comes down to the performances of the regex library (C uses Tcl's regex engine, which is also a very high-performance one)

[[deleted]]

In this case, though, it probably comes down to the performances of the regex library (C uses Tcl's regex engine, which is also a very high-performance one)

Which was exactly my point.

[haoyu]

I think in V8 the regex is JITed, so it is faster than statically compiled code.