[瓒ｉ椈] 浠ｇ爜椤哄簭涔熶細褰卞搷 LuaJIT 鐨勬墽琛屾晥鐜?/a>

Posted 2021-09-14 doujiang24

鏈€杩戞湁涓€涓湁瓒ｇ殑鍙戠幇锛岃皟鏁翠簡涓€琛?Lua 浠ｇ爜鐨勯『搴忥紝鎵ц鏃堕棿鍗村皯浜嗘帴杩戜竴鍗?馃槄

鐜板満妗堜緥

鎯呭喌涓嬮潰杩欎釜 lua 鑴氭湰 order-1.lua锛?/p>

local function f2 (...)
    return select(\'#\', ...)
end

local function f1 (...)
    local l = select(\'#\', ...)
    local m = 0
    for i = 1, l do
        m = m + select(i, ...)
    end
    
    local n = f2(...)

    return m + n
end

local n = 0
for i = 1, 1000 * 1000 * 100 do
    n = n + f1(1, 2, 3, 4, 5)
end

print("n: ", n)

鎵ц鏃堕棿涓?6.3s锛?/p>

$ time luajit order-1.lua
n:      2000000000

real    0m6.343s
user    0m6.342s
sys     0m0.000s

濡傛灉灏嗗叾涓殑 f1 鍑芥暟瀹炵幇锛岃皟鏁翠竴涓嬮『搴忥細

local function f1 (...)
    local n = f2(...)

    local l = select(\'#\', ...)
    local m = 0
    for i = 1, l do
        m = m + select(i, ...)
    end
    
    return m + n
end

杩欎釜鏀瑰姩鏄皢 n 鐨勮绠楁斁鍒?m 璁＄畻鐨勫墠闈€?br>浠庨€昏緫涓婃潵璇达紝m 鍜?n 涓や釜鏄苟娌℃湁椤哄簭渚濊禆锛屽厛绠楀摢涓€涓兘涓€鏍风殑锛屼絾鏄墽琛屾椂闂村嵈灏戜簡灏嗚繎涓€鍗婏細

$ time luajit order-2.lua
n:      2000000000

real    0m3.314s
user    0m3.312s
sys     0m0.002s

鍘熷洜鍒嗘瀽

棣栧厛鑲畾涓嶆槸浠€涔堣寮傞棶棰橈紝璁＄畻鏈哄彲鏄汉绫绘渶鐪熷疄鐨勪紮浼翠簡锛屽搱鍝?馃槃

杩欐鏄?Lua 杩欑楂樼骇璇█锛屼篃涓嶆槸 涓婃閭ｇ CPU 鎸囦护绾?/a> 鐨勫奖鍝嶄簡銆?/p>

tracing JIT

杩欐鏄洜涓?LuaJIT 鐨?tracing JIT 鎶€鏈殑褰卞搷銆?/p>

涓嶅儚 Java 閭ｇ method based JIT 鎶€鏈紝鏄寜鐓у嚱鏁版潵鍗虫椂缂栬瘧鐨勩€侺uaJIT 鏄寜鐓?trace 鏉ュ嵆鏃剁紪璇戠殑锛宼race 瀵瑰簲鐨勬槸涓€涓蹭唬鐮佹墽琛岃矾寰勩€?br>LuaJIT 浼氭妸鐑殑浠ｇ爜璺緞鐩存帴鍗虫椂缂栬瘧鐢熸垚鏈哄櫒鐮侊紝涓€涓茬儹鐨勪唬鐮佽矾寰勪篃灏辨槸涓€涓?trace銆傚悓鏃?trace 涔熶笉鏄棤闄愰暱鐨勶紝LuaJIT 鏈変竴濂楁満鍒舵潵鎺у埗 trace 鐨勫紑濮嬬粨鏉燂紙浠ュ悗鎵炬椂闂村啀璇︾粏璁板綍涓€绡囩殑锛夈€?/p>

鍏蜂綋鏉ヨ鏄繖鏍峰瓙鐨勶紝鍥犱负鍦?order-1.lua 閲岋紝TRACE 1 鍦?m 璁＄畻鐨勯偅涓?for 寰幆澶勫垯鍋滄浜嗭紝褰?TRACE 2 寮€濮嬬殑鏃跺€欙紝LuaJIT 杩樹笉鏀寔杩欑鎯呭喌涓嬪嵆鏃剁紪璇?锛堣繕澶勪簬 NYI 鐘舵€侊級VARG 杩欎釜瀛楄妭鐮侊紙涔熷氨鏄搴旂殑 ...锛夈€?/p>

鎵€浠ワ紝瀵艰嚧浜嗚繖閮ㄥ垎浠ｇ爜涓嶈兘琚?JIT锛屽洖褰掑埌浜?interpreter 妯″紡锛屾墍浠ュ鑷翠簡杩欎箞澶х殑鎬ц兘宸紓銆?/p>

濡備笅锛屾垜浠彲浠ュ湪 LuaJIT 杈撶殑鏃ュ織涓湅鍒?NYI: bytecode 71 杩欎釜鍏抽敭淇℃伅銆?/p>

$ luajit -jdump=bitmsr order-1.lua

...

---- TRACE 2 start 1/3 order.lua:13
0016  UGET     2   0      ; f2       (order.lua:13)
0017  VARG     4   0   0       (order.lua:13)
---- TRACE 2 abort order.lua:13 -- NYI: bytecode 71

鎬荤粨

璋冩暣浜?Lua 浠ｇ爜椤哄簭锛屽奖鍝嶄簡 LuaJIT 涓?trace 鐨勭敓鎴愶紝瀵艰嚧浜嗘湁瀛楄妭鐮佹病娉曡 JIT锛岃繖閮ㄥ垎鍥為€€鍒颁簡瑙ｉ噴妯″紡锛屼粠鑰屽鑷翠簡杈冨ぇ鐨勬€ц兘宸紓銆?/p>

鎰熸叏涓€涓?/h3>

JIT 鎶€鏈繕鏄洰濂界帺锛屼笉杩囬渶瑕佸涔犳帉鎻＄殑涓滆タ涔熸尯澶氱殑銆?/p>

浠ユ垜鐩墠鐨勭悊瑙ｏ紝tracing JIT 绠楁槸寰堢墰鐨?JIT 鎶€鏈簡锛屾湁鍏舵槑鏄剧殑浼樺娍銆備笉杩囦换浣曚竴椤规妧鏈紝鎬绘槸灏戜笉浜嗛潪甯稿鐨勪汉鍔涙姇鍏ャ€?br>鍗充娇鍍?Lua 杩欑灏忓阀鐨勮瑷€锛屼篃杩樻槸鏈変笉灏戠殑 NYI 娌℃湁琚?JIT 鎶€鏈€?br>鍍?Java 杩欑閲嶅瀷璇█锛孞IT 杩欐柟闈㈢殑鎶€鏈紝鎬曟槸闇€瑕佸緢澶氬ぇ鐗涙墠鍫嗗嚭鏉ョ殑銆?/p>

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