{"id":55147,"date":"2020-01-13T00:00:00","date_gmt":"2020-01-12T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/pervyj-vypusk-wasm3-bystrogo-interpretatora-webassembly"},"modified":"2020-02-18T14:03:13","modified_gmt":"2020-02-18T11:03:13","slug":"pervyj-vypusk-wasm3-bystrogo-interpretatora-webassembly","status":"publish","type":"post","link":"https:\/\/prohoster.info\/no\/blog\/news\/pervyj-vypusk-wasm3-bystrogo-interpretatora-webassembly","title":{"rendered":"Den f\u00f8rste utgaven av wasm3, en rask WebAssembly-tyder","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Tilgjengelig<\/a><\/noindex> f\u00f8rste utgave wasm3<\/a><\/noindex>, en meget rask tolk for WebAssembly-bytecode, hovedsakelig designet for \u00e5 kj\u00f8re WebAssembly-applikasjoner p\u00e5 mikrokontrollere og plattformer der det ikke finnes en JIT-implementering av WebAssembly, hvor det er for lite minne til \u00e5 kj\u00f8re JIT eller der opprettelse av eksekverbare minnesider som er n\u00f8dvendige for JIT-implementering, ikke tillates. Prosjektkoden er skrevet i C og distribueres<\/a><\/noindex> under the MIT license.<\/p>\n

Wasm3 passerer tests<\/a><\/noindex> kompatibilitet med spesifikasjonen WebAssembly 1.0 og kan brukes til \u00e5 kj\u00f8re mange WASI-applikasjoner, og tilbyr ytelse som kun er 4\u20135 ganger lavere enn JIT-motorer (liftoff<\/a><\/noindex>, cranelift<\/a><\/noindex>) og 11,5 ganger lavere enn kj\u00f8ring av native kode. Sammenlignet med andre WebAssembly-tolker (wac<\/a><\/noindex>, life<\/a><\/noindex>, wasm-micro-runtime<\/a><\/noindex>), er wasm3 15,8 ganger raskere.<\/p>\n

For \u00e5 kj\u00f8re wasm3 kreves det 64 Kb minne for kode og 10 Kb RAM, noe som gj\u00f8r prosjektet egnet for \u00e5 kj\u00f8re kompilert WebAssembly-applikasjoner p\u00e5 mikrokontrollere<\/a><\/noindex>, som Arduino MKR*, Arduino Due, Particle Photon, ESP8266, ESP32, Air602 (W600), nRF52, nRF51 Blue Pill (STM32F103C8T6), MXChip AZ3166 (EMW3166),
\nMaix (K210), HiFive1 (E310), Fomu (ICE40UP5K) og ATmega1284, samt p\u00e5 kort og datamaskiner basert p\u00e5 x86-, x64-, ARM-, MIPS-, RISC-V- og Xtensa-arkitektur. St\u00f8ttede operativsystemer inkluderer Linux (inkludert rutere basert p\u00e5 OpenWRT), Windows, macOS, Android og iOS. Det er ogs\u00e5 mulig \u00e5 kompilere wasm3 til WebAssembly-bytecode for \u00e5 kj\u00f8re tolker i nettleseren eller for innf\u00f8dt kj\u00f8ring (self-hosting).<\/p>\n

H\u00f8y ytelse oppn\u00e5s gjennom bruk av Massey Meta Machine<\/a><\/noindex> (M3), hvor forh\u00e5ndstranslasjon av bytekode til mer effektive operasjoner som genererer pseudomaskinkode, reduserer overheaden ved dekoding av bytekode, og modellen for en stakkbasert virtuell maskin gj\u00f8res mer effektivt ved \u00e5 bruke en registerbasert tiln\u00e6rming. Operasjoner i M3 representerer C-funksjoner, der argumentene er registrene til den virtuelle maskinen, som kan reflekteres mot CPU-register. Vanlige sekvenser av operasjoner for optimalisering omdannes til sammenfattede operasjoner.<\/p>\n

I tillegg kan det nevnes resultatene av forskningen<\/a><\/noindex> spredning
\nWebAssembly p\u00e5 nettet. Etter \u00e5 ha analysert 948 000 av de mest popul\u00e6re nettstedene if\u00f8lge Alexa, fant forskerne ut at WebAssembly brukes p\u00e5 1639 nettsteder (0,17 %), dvs. p\u00e5 1 av hver 600 nettsteder. Totalt ble det identifisert 1950 WebAssembly-moduler p\u00e5 nettsteder, hvorav 150 var unike. N\u00e5r vi vurderte bruksomr\u00e5det til WebAssembly, ble det gjort bekymringsfulle funn \u2014 i mer enn 50 % av tilfellene ble WebAssembly brukt til ondsinnede form\u00e5l, for eksempel for kryptovaluta-mining (55,7 %) og skjuling av koden til ondsinnede skript (0,2 %). Blant de legitime bruksomr\u00e5dene for WebAssembly ble det notert utf\u00f8ring av biblioteker (38,8 %), spillutvikling (3,5 %) og utf\u00f8ring av egen kode skrevet ikke i JavaScript (0,9 %). I 14,9 % av tilfellene ble WebAssembly brukt til milj\u00f8analyse for identifisering av brukeren (fingerprinting).
\n

\"Den<\/center><\/p>\n

<\/a><\/noindex><\/p>\n

Kilde: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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