The EmterpreterAsync JS object does have a few fields, yes. I think they only matter during an async event though.
To debug this kind of thing, the DETERMINISTIC option may be useful. It makes all timing and random numbers deterministic, which for many programs (without user input, and single-threaded) means it is deterministic, so you can re-run the same reloaded program to debug it. On Tue, May 14, 2019 at 3:56 AM Александр Гурьянов <[email protected]> wrote: > Thanks for feedback. Now I am saving and restoring all wasm mutable > globals. But seems it does not help, I still have unstable behaviour. > I forgot to say that I use emterpeter too, can it produce additional > problem for save/restore wasm state? > > вс, 12 мая 2019 г. в 22:31, Liam Wilson <[email protected]>: > > > > A couple of years ago was playing around with something similar with > Emscripten in asm.js mode. I was able to snapshot/restore program state by > saving the contents of the heap to another array, and also saving STACKTOP. > I also had to replace _malloc and _free as there seemed to be some internal > state in there too. > > > > Code is here > https://github.com/cosinusoidally/emscripten_experiments/blob/master/jpeg_decoding/time_travel_test.js > > > > Thanks > > Liam Wilson > > > > > > On Friday, May 10, 2019 at 12:33:05 PM UTC+1, caiiiycuk wrote: > >> > >> Hi is it possible to make snapshot of runtime, serelize it to file and > >> then restore runtime on other client. I understand that snapshotting > >> have a lot of pitfalls. But for now I want to implement simpliest > >> case. My target is wasm, main loop is executed by requestAnimation > >> frame. > >> > >> So stack always same: > >> > >> request animation frame -> loop function -> create/resotre memory -> > >> actual programm implementation > >> > >> The first code in loop function is to restore/save heap, like this: > >> > >> static void em_main_loop(void) { > >> if (doHeapOperation()) { > >> return; > >> } > >> > >> // actual programm implementation > >> } > >> > >> As heapOperation I use this: > >> > >> Module.heapOperation = function() { > >> delete Module.heapOperation; > >> var buffer = new ArrayBuffer(Module.HEAPU8.byteLength); > >> window.heapCopy = new Uint8Array(buffer); > >> window.heapCopy.set(Module.HEAPU8); > >> console.log("INFO: heapCopy created"); > >> > >> function restore() { > >> Module.heapOperation = function() { > >> delete Module.heapOperation; > >> Module.HEAPU8.set(window.heapCopy); > >> console.log("INFO: heapCopy loaded"); > >> } > >> }; > >> > >> setTimeout(restore, 1000); > >> } > >> > >> So, I just saving all wasm memory, and then restore it after 1 sec. > >> And this code works in 50% cases, sometimes program is start as 1 > >> second before, but other time it continue with unpredictable > >> behaviour. > >> > >> Because we paused / resume with same memory and same stack I assume > >> that everything should works. But, in reality it does not. Is > >> emscripten also save some state in javascript? What I am missing. > >> Assume that my program did not use FS, GPU, SOUNDS and pure native (no > >> EM_ASM inside), is this technique should works? > > > > -- > > 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]. > > To view this discussion on the web visit > https://groups.google.com/d/msgid/emscripten-discuss/ca1ab65c-d418-4ba6-89b8-8f2fc08501f1%40googlegroups.com > . > > 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]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/emscripten-discuss/CAKOm%3DVFttict2uVoLWTTdeScUFjeu8FFhFif%3DJSm%3Djvd4%3DFdkA%40mail.gmail.com > . > 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]. To view this discussion on the web visit https://groups.google.com/d/msgid/emscripten-discuss/CAEX4NpTm0pkGNvRuzH42cNUzEPnpCEkrb7xfk_ArW3uaefPKEQ%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
