{"id":38137,"date":"2019-10-31T22:21:53","date_gmt":"2019-10-31T19:21:53","guid":{"rendered":"https:\/\/prohoster.info\/blog\/proekt-po-dobavleniyu-v-gcc-podderzhki-rasparallelivaniya-protsessa-kompilyatsii\/"},"modified":"2019-10-31T22:21:53","modified_gmt":"2019-10-31T19:21:53","slug":"proekt-po-dobavleniyu-v-gcc-podderzhki-rasparallelivaniya-protsessa-kompilyatsii","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/news\/proekt-po-dobavleniyu-v-gcc-podderzhki-rasparallelivaniya-protsessa-kompilyatsii","title":{"rendered":"Projektet om at tilf\u00f8je underst\u00f8ttelse af parallelisering af kompilationsprocessen i GCC","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Som en del af forskningsprojektet Parallel GCC<\/a><\/noindex> er arbejdet begyndt p\u00e5 at tilf\u00f8je en funktion til GCC, der muligg\u00f8r opdeling af kompilationsprocessen i flere parallelt k\u00f8rende tr\u00e5de. I \u00f8jeblikket anvendes der til hurtigere byggeri p\u00e5 multikernet systemer en metode i make-utility, der starter separate kompilatorprocesser, hvor hver enkelt behandler en separat kodefil. Det nye projekt eksperimenterer med at sikre parallelisering p\u00e5 kompilatorniveau, hvilket potentielt kan \u00f8ge effektiviteten p\u00e5 multikernet systemer. <\/p>\n

Til testform\u00e5l udviklet<\/a><\/noindex> enkel parallelt forgrening af GCC, hvor et nyt parameter «—param=num-threads=N» er foresl\u00e5et til at angive antallet af tr\u00e5de. I begyndelsen er der implementeret udf\u00f8relse af interprocedurale optimeringer i separate udf\u00f8relsestr\u00e5de, som cyklisk kaldes for hver funktion og egner sig godt til parallelisering. GIMPLE-operationer, der er ansvarlige for hardwareuafh\u00e6ngige optimeringer og vurderer interaktionen mellem funktioner, er ogs\u00e5 blevet flyttet til separate tr\u00e5de.<\/p>\n

I n\u00e6ste fase planl\u00e6gges det ogs\u00e5 at flytte interprocedurale RTL-optimeringer, der tager h\u00f8jde for hardwareplatformens karakteristika, ud i separate tr\u00e5de. Derefter planl\u00e6gges det at implementere parallelisering af intraprocedurale optimeringer (IPA), der anvendes p\u00e5 koden inden for funktionen, uafh\u00e6ngigt af kaldets karakteristika. En begr\u00e6nsning er i \u00f8jeblikket garbage collector, som har f\u00e5et en global l\u00e5s, der deaktiverer garbage collection-operationer under drift i multi-threaded tilstand (i fremtiden vil garbage collectoren blive tilpasset for multi-threaded udf\u00f8relse af GCC).<\/p>\n

For at vurdere \u00e6ndringen i ydeevnen er en test suite blevet forberedt, der udf\u00f8rer bygningen af filen gimple-match.c, som indeholder mere end 100.000 linjer kode og 1.700 funktioner. Tests p\u00e5 et system med en Intel Core i5-8250U CPU med 4 fysiske kerner og 8 virtuelle (Hyperthreading) viste en reduktion i tiden for udf\u00f8relse af Intra Procedural GIMPLE-optimeringer fra 7 til 4 sekunder med 2 tr\u00e5de og til 3 sekunder med 4 tr\u00e5de, hvilket giver en hastighedsfor\u00f8gelse af den p\u00e5g\u00e6ldende byggefase p\u00e5 henholdsvis 1.72 og 2.52 gange. Testene viste ogs\u00e5, at brugen af virtuelle kerner ved Hyperthreading ikke medf\u00f8rer en stigning i ydeevnen. <\/p>\n

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

Den samlede byggetid er blevet reduceret med cirka 10%, men if\u00f8lge prognoserne vil parallelisering af RTL-optimeringerne muligg\u00f8re mere betydningsfulde resultater, da denne fase tager v\u00e6sentligt l\u00e6ngere tid under kompilering. Estimatet er, at efter paralleliseringen af RTL vil den samlede byggetid falde med en faktor p\u00e5 1,61. Herefter kan byggetiden yderligere reduceres med 5-10% ved at parallelisere IPA-optimeringer.<\/p>\n

\"Projektet<\/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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