Oh.. by previous discussion I thought it was exactly the other way around, that -profiling disabled optimizations that -g2 had. I've always had the assumption that -g2 had full optimizations enabled, but apparently not. Also, I see that using OUTLINING_LIMIT disables the simplifyIfs optimization so it can affect performance as well.
2014-07-31 1:00 GMT+03:00 Alon Zakai <[email protected]>: > -g2 (and -g1, anything but -g0) disables simplifyIfs, because it can > generate lines thousands of characters long, due to commaification ( x = y; > a = b; turns into x = y, a = b; ). -profiling leaves simplifyIfs on. > Basically -profiling is what you want when you are profiling (at least how > I see things): full performance, just leaving function names intact (and > basic indentation). > > - Alon > > > > On Wed, Jul 30, 2014 at 2:55 PM, Jukka Jylänki <[email protected]> wrote: > >> Can you remind the exact changes that -profiling does? There was some >> optimization that -profiling didn't do, but -g2 should not affect any >> optimizations? I recall you said that reading through the output code files >> with -profiling was slightly easier than with -g2, but wouldn't -g2 be >> better for users that only cared about Firefox/Chrome profiler results and >> only need function names intact? >> >> >> 2014-07-31 0:50 GMT+03:00 Alon Zakai <[email protected]>: >> >> -profiling is slightly better than -g2 here. -profiling is specifically >>> intended for the use case of profiling the generated code. >>> >>> - Alon >>> >>> >>> >>> On Wed, Jul 30, 2014 at 1:18 PM, Jukka Jylänki <[email protected]> >>> wrote: >>> >>>> Hi! >>>> >>>> Worth pinging here in a very recent and awesome advance in Firefox: >>>> Finally as of last night, Firefox Nightly now supports profiling asm.js >>>> execution. This means that when you use the CPU profiler after updating to >>>> latest Nightly, you no longer need to disable asm.js before profiling in >>>> order to get meaningful stack traces from asm.js functions! >>>> >>>> Remember to build all your profiling builds with the proper >>>> optimization flags (-O2/-O3/-Os/-Oz) at both compile and link time, and add >>>> in the linker flag -g2 in order to preserve the function names unminified. >>>> These will ensure that you have the fastest output that retains profiling >>>> info, at the expense of output size. >>>> >>>> For best profiling UI, make sure you are running the geckoprofiler.xpi >>>> Firefox add-on, documented here: >>>> https://developer.mozilla.org/en-US/docs/Mozilla/Performance/Profiling_with_the_Built-in_Profiler >>>> >>>> Thanks go to Luke Wagner for the hard work of implementing the asm.js >>>> profiling support in to Firefox! >>>> >>>> Jukka >>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "emscripten-discuss" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to [email protected]. >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "emscripten-discuss" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "emscripten-discuss" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> For more options, visit https://groups.google.com/d/optout. >> > > -- > You received this message because you are subscribed to the Google Groups > "emscripten-discuss" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "emscripten-discuss" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
