Or it's entirely my fault... sorry On Thu, Aug 1, 2019 at 10:41 AM J Decker <d3c...@gmail.com> wrote:
> I'm not sure where/how to address this... so bear with me if this isn't > JUST V8. > > My latest toy is a RK3399 system ( > http://en.t-firefly.com/product/rocrk3399pc ) > I've manged to get the linux image to build, and install a more complete > development environment, and got Node 13-pre (12.7.0) to build, and my own > addon. > I was curious about the JS vs native performance, and I have both JS and C > versions of many things in a few packages. The JS performance is pretty > good, can't fault much there, but then when I ran the same simple tests > like "parse( '1234' )" to get a number result, the Node Addon (which works > directly with the V8 library for 99% of the interfacing, just using a few > convenience macros to build FunctionTemplates) > I *think* that the conversion from string to String::Utf8Value is > extra-ordinarily slow. another test that either passes numbers, or passes > nothing and gets back arraybuffers(with external storage) and/or Numbers is > actually very fast. > > I don't know how I can create a reproduction, and/or I don't know what to > really investigate.... I do have, in the case of the parsin, some > performance timers around converting from JS to C, doing the parsing, and > building the values back in JS Engine from C that can narrow it down... > > A test that usese the same parser in JS does 4M parsings in 6 seconds, and > takes the (CMake Debug) build does 2M parsings in 35 seconds, and the CMake > Release build 27 seconds. The run times on windows x64 are approximately > the same (as each other, at about 1 seconds for 4M/2M respectively... > because getting utf8 values sucks (pardon the slang)). Single threaded. > > -- > -- > v8-users mailing list > v8-users@googlegroups.com > http://groups.google.com/group/v8-users > --- > You received this message because you are subscribed to the Google Groups > "v8-users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to v8-users+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/v8-users/dc1c1cdd-80b4-4f23-ba87-a7ff49610339%40googlegroups.com > <https://groups.google.com/d/msgid/v8-users/dc1c1cdd-80b4-4f23-ba87-a7ff49610339%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- -- v8-users mailing list v8-users@googlegroups.com http://groups.google.com/group/v8-users --- You received this message because you are subscribed to the Google Groups "v8-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to v8-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/v8-users/CAA2GJqVXNY8y_k_UjJdxrdE2uXBRxedoEdjZt%3DDTGgR7Mpc%3DnA%40mail.gmail.com.
