锘??xml version="1.0" encoding="utf-8" standalone="yes"?> 鍦ㄤ笂涓鑺備腑鎴戜滑璁茬殑鏄竴涓父鐢ㄧ殑騫惰鍖栫紪紼嬫柟娉曪紙for鐨勫茍琛屽寲錛夛紝鍏跺疄瀹冨彧鏄茍琛屽寲緙栫▼鐨勪竴涓壒渚嬶紝鍙槸瀹冪殑鍦頒綅杈冮珮錛屾垨鑰呰瀹冩瘮鍏跺畠騫惰鍖栨洿閲嶈銆傚湪鏈妭涓垜浠皢璁ㄨ涓鑸殑騫惰鍖哄煙緙栫▼銆?/span> 涓鑸牸寮忥細#pragma omp parallel [clause[clause]…]{…} 鍏朵腑{…}涓負姣忎釜綰跨▼閮芥墽琛岀殑閮ㄥ垎錛屽湪parallel鍚庨潰鍙互璺熼殢涓浜涙寚瀵煎瓙鍙ワ紝渚嬪錛歵hreadprivate銆乧opyin絳夛紝鏈妭涓皢浠ヤ竴浜涘疄渚嬫潵渚濇璁茶В榪欎簺璇彞鐨勪綔鐢ㄣ?/span> 鏃跺埢璁頒綇錛屼富綰跨▼灝辨槸0鍙風嚎紼嬶紝榪欎釜涓巉or涓嶅悓錛屽彟澶杙rivate銆乫irstprivate銆乴astprivate鏄痜or騫惰鐨勪笢瑗挎渶濂戒笉瑕佹嬁鏉ユ瘮杈冿紝灝界鎴戝湪鏈枃閲屾瘮杈冧簡錛屼絾鏄垜榪樻槸鎰熻鏈変簺澶寸棝鍟娿?/span> 渚? 涓嶅甫鎸囧瀛愬彞鐨勫茍琛岀▼搴?/span> #pragma omp parallel鎸囩ず瀹冧笅闈㈢殑涓瀵瑰ぇ鎷彿鍐呯殑紼嬪簭澶嶅埗鎵цthreads涓暟嬈°傞粯榛樹漢鎯呭喌涓嬶紝鎵鏈夊茍琛屽尯鍩熶腑鐨勫彉閲忔槸鍏變韓鐨勶紝鎵浠ヤ竴瀹氳璋ㄩ槻鏁版嵁绔炰簤鐨勫彂鐢熴? 鍥?銆佷緥1鐨勬墽琛岀粨鏋?/p>
渚?鐨勬墽琛岀粨鏋滃彲浠ョ湅鍑哄洓涓嚎紼嬪垎鍒墽琛屼簡涓閬?pragma omp parallel涓嬮潰鐨勮鍙ワ紝鎯蟲兂涓涓嬪鏋滀嬌鐢?pragma omp parallel for浼氭槸浠涔堟牱鐨勭粨鏋溿?/span> 渚? 浣跨敤threadprivate瀛愬彞 姝ゅ懡浠よ〃紺烘墍鏈夊茍琛岀嚎紼嬩嬌鐢ㄦ寚瀹氬彉閲忎負鍚勮嚜縐佹湁鐨勶紝鑳借瀹氫箟涓哄悇綰跨▼縐佹湁鍙橀噺鐨勫彉閲忓彧鑳芥槸闈欐佸彉閲忓拰鍏ㄥ眬鍙橀噺銆傜湅涓嬮潰鐨勭▼搴忥紝甯屾湜浣犺兘鍙戠幇錛屽叾瀹?pragma omp threadprivate()鏄彲浠ュ崟鐙嬌鐢ㄧ殑銆?/span> 璇存槑涓涓嬶細琚畾涔変負threadprivate鐨勫彉閲忓浜庢瘡涓嚎紼嬫案榪滄槸媧葷殑錛屼綘鍦ㄤ換浣曟椂鍊欏啀嬈¢噸鏂板惎鍔ㄥ悇綰跨▼鏃訛紝鍓嶉潰騫惰鏃舵渶鍚庡緱鍒扮殑鍙橀噺鍊間粛鐒朵繚鐣欎粬鐨勫鹼紝濡傛灉浣犵敤private浠f浛threadprivate錛岄偅涔堜綘閲嶆柊鍚姩鍚勭嚎紼嬫椂錛屽彉閲忕殑鍊間粛鐒朵負0銆傚鏋滀綘涓嶅垵濮嬪寲瑕佸0鏄庝負private鐨勫彉閲忥紝閭d箞鍦ㄤ覆琛岀▼搴忎腑錛屼綘灝變笉鑳藉啀娌℃湁浠諱綍璧嬪肩殑鎯呭喌涓嬩嬌鐢ㄥ畠錛屽惁鍒欎細寮曡搗寮傚父鐨勶紙VS2010錛夈傝屼笖private涓嶈兘鍗曠嫭鍍弔hreadprivate閭f牱瀹氫箟鏌愪釜鍙橀噺銆?/span> 濡傛灉浣犱嬌鐢ㄥ彟澶?pragma omp threadprivate(var)錛岄偅涔坴ar蹇呴』鏄潤鎬佸彉閲忔垨鑰呭叏灞鍙橀噺錛屽榪囦綘鍦ㄥ茍琛屽紑濮嬩箣鍓嶅茍娌℃湁鍒濆鍖栬祴鍊鹼紝閭d箞姣忎釜綰跨▼涓粯璁ar鐨勫間負0.濡傛灉浣犺祴浜嗗垵鍊鹼紝閭d箞姣忎釜綰跨▼涓璿ar鐨勫垵鍊奸兘鏄綘璧嬬殑鍒濆鍊箋傚叾涓富綰跨▼灝辨槸0鍙風嚎紼嬨傚鏋滀綘浣跨敤浜?pragma omp private(var)錛岄偅涔坴ar騫朵笉浼氳祴鍒濆鹼紝鍗充嬌浣犲湪騫惰涔嬪墠璧嬩簡鍒濆箋傛兂鎯沖師鍏?pragma omp parallel for 鐨刦irstprivate灝辯煡閬撲簡錛屽懙鍛點傚湪#pragma omp parallel涓彲浠ヤ嬌鐢╨astprivate錛屼絾鏄笉鑳戒嬌鐢╨astprivate錛屼嬌鐢╢irstprivate(var)鍚庯紝涓茶閮ㄥ垎鐨剉ar騫朵笉鏄茍琛屾椂0鍙風嚎紼嬬殑var鍊鹼紝瀹冧粛鏈綘鍘熷厛璧嬬殑鍒濆箋傛槸涓嶆槸寰堢粫鍟婏紵鍛靛懙錛屼綘鍙互榪欐牱鐞嗚В錛屼嬌鐢╢irstprivate鍜宲rivate鐨勫茍琛岄兘涓嶆槸綰湡鐨勮仈鍚堜富綰跨▼鐨勭紪鍙楓傝繖鏍峰氨娣蜂笉浜嗕簡銆?/span> 鍥?銆佷緥2鎵ц緇撴灉 threadprivate鎸囧畾浜唖um榪欎釜鍙橀噺灞炰簬姣忎釜綰跨▼錛屾瘡涓嚎紼嬮兘鏈夎嚜宸辯殑sum鍙橀噺錛屽悇涓嚎紼嬬粨鏉熷悗浠栦滑鐨剆um鍙橀噺騫舵病鏈夋敞閿錛屽湪姝ゅ晩鎵ц鏃訛紝浠栦滑鍚勮嚜鐨剆um鍊艱繕淇濇寔鍘熷箋?/span> 渚? 浣跨敤copyin 鎸囧畾涓葷嚎紼嬬殑鍊兼嫹璐濆埌鍚勭嚎紼嬩腑鍘伙紝涓嬮潰鐨勪緥瀛愪腑錛宻um鏄瘡涓嚎紼嬬嫭鏈夌殑錛屽茍涓斿垵濮嬪奸兘鏄?錛宮ain涓涓琛屼唬鐮佸皢0鍙風嚎紼嬬殑sum鍊艱祴涓?00錛屽叾瀹冪嚎紼嬬殑sum鍊煎茍娌℃湁鍙樸?/span> 鍥?銆佷緥3鐨勬墽琛岀粨鏋?/p>
鍥?銆佷緥3涓皢copyin(sum)鍒犻櫎鍚庣殑鎵ц緇撴灉 閫氳繃浠ヤ笂鍥?銆?鍙互鐪嬪嚭copyin鐨勭敤澶勬槸鍒濆鍖栧悇涓嚎紼嬩腑鑷繁縐佹湁鐨剆um鍙橀噺銆傚疄闄呬笂瀹氫箟sum涓哄叏灞閲忔椂鐨勫垵濮嬪煎氨鏄師sum鍊鹼紙濡傛灉涓嶄嬌鐢╟opyin鐨勮瘽錛夈?br /> 鎴戞兂浜嗘兂threadprivate鍜宲rivate浠ュ強firstprivate鐨勫尯鍒傚啓鍑烘潵澶у璁ㄨ涓嬨?/p>
1銆乼hreadprivate錛岄檺鍒跺彉閲忎負姣忎釜綰跨▼縐佹湁銆傝闄愬埗鐨勫彉閲忓繀欏誨叿鏈夊叏灞鐗規э紝浠栫殑鐢熷懡鍛ㄦ湡鏄暣涓▼搴忋?/p>
2銆乸rivate錛屽彲浠ラ檺鍒跺彉閲忎負姣忎釜綰跨▼縐佹湁錛屼絾鏄粬鐨勭敓鍛藉懆鏈熸槸涓嬈″惎鍔ㄥ茍琛岃綆椼?/p>
3銆乫irstprivate錛屽彲浠ュ皢絀胯紼嬪簭涓殑鍒濆煎甫榪涙瘡涓嚎紼嬶紝鍙橀噺涓烘瘡涓嚎紼嬬鏈夈傜敓鍛藉懆鏈熶笌private鐩稿悓銆?/p>
4銆佽繕鏈変釜lastprivate鐨勯棶棰橈紝浠栧茍涓嶈兘鍦ㄥ尯鍩熷茍琛屼腑浣跨敤銆?/p>
澶у瀹為獙鎶娿傘傘?/p>
涓鑸牸寮忥細 #pragma omp parallel for [clause[clause…]] for(index = first; qualification; index_expr) {…} 絎竴鍙ヤ腑[]鐨勯儴鍒嗘槸鍙夌殑錛岀敱鑷繁鐨勭▼搴忓茍琛岀壒鐐硅屽畾銆傚ぇ瀹跺厛涓嶈鎶婄簿鍔涙斁鍒拌繖閲岄潰銆傚悗闈㈢殑鏂囩珷涓細緇х畫璁茶В鐨勩?/span> 1銆乮ndex鐨勫煎繀欏繪槸鏁存暟錛屼竴涓畝鍗曠殑for褰㈠紡錛歠or(int i = start; i < end; i++){…} 銆?/span> 2銆乻tart鍜宔nd鍙互鏄換鎰忕殑鏁板艱〃杈懼紡錛屼絾鏄畠鍦ㄥ茍琛屽寲鐨勬墽琛岃繃紼嬩腑鍊間笉鑳芥敼鍙橈紝涔熷氨鏄鍦╢or騫惰鍖栨墽琛屼箣鍓嶏紝緙栬瘧鍣ㄥ繀欏諱簨鍏堢煡閬撲綘鐨勭▼搴忔墽琛屽灝戞錛屽洜涓虹紪璇戝櫒瑕佹妸榪欎簺璁$畻鍒嗛厤鍒頒笉鍚岀殑綰跨▼涓墽琛屻?/span> 3銆佸驚鐜鍙ュ彧鑳芥槸鍗曞叆鍙d絾鍑哄彛鐨勩傝繖閲屽彧瑕佷綘閬垮厤浣跨敤璺寵漿璇彞灝辮浜嗐傚叿浣撹灝辨槸涓嶈兘浣跨敤goto銆乥reak銆乺eturn銆備絾鏄彲浠ヤ嬌鐢╟ontinue錛屽洜涓哄畠騫朵笉浼氬噺灝戝驚鐜鏁般傚彟澶杄xit璇彞涔熸槸鍙互鐢ㄧ殑錛屽洜涓哄畠鐨勮兘鍔涘お澶э紝浠栦竴鏉ワ紝紼嬪簭灝辯粨鏉熶簡銆?/span> 渚?銆乫or寰幆騫惰: 渚?鐨勬墽琛岀粨鏋滃鍥?鎵紺猴細 鍥?銆佷緥1鐨勬墽琛岀粨鏋?/p>
浠庣粨鏋滀腑鍙互鐪嬪嚭 i 灞炰簬{0,1,2}鏃剁敱0鍙風嚎紼嬫墽琛岋紝i 灞炰簬{3,4,5}鏃剁敱1鍙風嚎紼嬫墽琛岋紝i 灞炰簬{6,7,8}鏃剁敱2鍙風嚎紼嬫墽琛岋紝i 灞炰簬{9,10,11}鏃剁敱3鍙風嚎紼嬫墽琛屻俹mp_get_thread_num()榪欎釜鍑芥暟閫氳繃鎵ц緇撴灉澶у涔熺煡閬撲簡錛屼粬榪斿洖姣忎釜綰跨▼鐨勭紪鍙楓?/span> openMP涓湁澶氱騫惰鍖栧瓙鍙ワ紝榪欎簺瀛愬彞閮芥槸涓烘帶鍒跺驚鐜茍琛屽寲緙栬瘧鑰岃瀹氱殑錛岃繖閲屾垜浠富瑕佸叧娉ㄦ暟鎹綔鐢ㄥ煙瀛愬彞錛岃繖閲岀殑鏁版嵁浣滅敤鍩熸槸鎸囧悇涓嚎紼嬫槸鍚﹀鏌愪竴鍙橀噺鏈夋潈璁塊棶銆俿hared瀛愬彞鐢ㄦ潵鏍囪鍙橀噺鍦ㄥ悇涓嚎紼嬩箣闂存槸鍏變韓鐨勶紝private瀛愬彞鏍囪鍙橀噺鍦ㄥ悇涓嚎紼嬩箣闂存槸縐佹湁鐨勶紝瀹為檯涓婂畠浼氬湪鍦ㄦ瘡涓嚎紼嬩腑淇濆瓨涓涓壇鏈傞粯璁ゆ儏鍐典笅錛屽茍琛屾墽琛岀殑鍙橀噺鏄叡浜殑銆傝嚦浜庡叾瀹冪紪璇戝瓙鍙ュ皢鍦ㄥ悗闈㈢殑鏂囩珷涓粙緇嶃?/span> 瀹為檯涓婃垜寰堥毦鎯沖埌涓涓患鍚堢殑渚嬪瓙鏉ヨ瑙h繖縐嶅瓙鍙ョ殑闄愬埗寮傚悓錛屾墍浠ユ垜鍐欎簡鍑犱釜渚嬪瓙銆?/span> 渚?銆乸rivate #include 鍥?銆佷緥2鎵ц緇撴灉 渚? firstprivate(var)錛氭寚瀹歷ar鍦ㄦ瘡涓嚎紼嬩腑閮芥湁涓涓壇鏈紝騫朵笖var鐨勫垵濮嬪煎湪騫惰鎵ц寮濮嬩箣鍓嶅畾涔夛紝姣忎釜騫惰綰跨▼鐨剉ar鐨勫壇鏈垵鍊煎氨鏄覆琛屾椂瀹氫箟鐨勫垵濮嬪箋傜▼搴忕粨鏉熷悗涓茶紼嬪簭涓殑var鍊煎茍涓嶄細鏀瑰彉銆?/p>
鍥?銆佷緥3鐨勬墽琛岀粨鏋?/p>
渚? lastprivate(var):鎸囧畾鏈鍚庡綰跨▼鎵ц瀹屽悗鍘熶覆琛屽驚鐜渶鍚庝竴嬈ar鐨勫煎甫鍒頒富綰跨▼錛堜覆琛岄儴鍒嗭級 鍥?銆佷緥4鐨勬墽琛岀粨鏋?/p>
渚? firstprivate涓巐astprivate鑱旂敤錛屽緢濂囨猳penMP寰堝鎯呭喌涓嬫槸涓嶅厑璁告煇涓彉閲忚鎸囧畾涓ゆ瑙勫垯鐨勶紝浠栦咯鍗村彲浠ワ紝鍛靛懙錛岃屼笖閰嶅悎鏁堟灉榪樹笉閿欍?/span> 鍥?銆佷緥5鐨勬墽琛岀粨鏋?/p>
浠庝笂闈㈢殑渚?銆?鐨勭▼搴忎腑鍙互鐪嬪嚭渚?涓瘡涓嚎紼嬩腑x閮芥槸縐佹湁鐨勶紝瀹冨睘浜庢瘡涓嚎紼嬶紝鍦ㄤ富綰跨▼鐨勫畾涔夊茍涓嶈兘甯﹀叆鍒板悇涓嚎紼嬩腑錛屼嬌鐢╢irstprivate鍚庯紝x鍦ㄤ富綰跨▼鐨勫垵濮嬪煎彲浠ュ甫鍒板悇涓嚎紼嬩腑錛屽湪鍥?鍙互鐪嬪嚭姣忎釜綰跨▼x鐨勮緭鍑虹粨鏋滃疄闄呮槸鐩稿悓鐨勶紝浣嗘槸鍦ㄥ茍琛屾墽琛岀粨鏉熷悗錛屼富綰跨▼涓殑x鍊間粛鐒朵負4.3銆備粠渚?鐨勬墽琛岀粨鏋滃彲浠ョ湅鍑烘渶鍚巟鐨勫煎甫鍑哄埌浜嗕富綰跨▼涓紝榪欎釜x鍊煎埌搴曟槸鍝釜綰跨▼涓殑鍝紵絳旀鏄渶鍚庝竴鍙璧嬪煎悗鐨勫鹼紝鍝釜綰跨▼鎵ц瀹岀殑鏈鏅氬氨鏄摢涓獂鐨勫箋備緥5鏄劇ずfirstprivate涓巐astprivate鑱斿悎浣跨敤鐨勬墽琛岀粨鏋溿?/span> 渚? reduction瑙勭害鎿嶄綔錛?/span> 鎵цreduction鐨勫彉閲忚鐗瑰埆娉ㄦ剰錛屼互reduction(+:sum)涓轟緥銆?/span> 絎竴縐嶆儏鍐碉細sum涓哄眬閮ㄥ彉閲忋傝繖鏄綘蹇呴』涓簊um鍦ㄤ覆琛岀▼搴忎腑璧嬪垵鍊鹼紝sum 琚緗負姣忎釜綰跨▼縐佹湁錛屽厛鍚勮嚜鎵ц瀹岀畻鍑哄悇鑷殑sum鍊鹼紝鏈鍚庝富綰跨▼浼氬皢 銆婄嚎紼嬫暟+1銆嬩釜sum鍙橀噺瑙勭害錛屾瘮濡備綘num_thread(4),鍦ㄥ紑濮嬪茍琛屾墽琛屼箣鍓嶄綘瀵硅綰﹀彉閲忚祴鍒濆間負10錛屽茍琛屾椂鍋囪姣忎釜綰跨▼綆楃殑鐨剆um鍊間負1錛岄偅涔堟渶緇坰um甯﹀埌涓茶紼嬪簭涓殑鍙橀噺鍊間負14錛堜覆琛岀殑10+鍥涗釜綰跨▼鐨?錛夈?/span> 絎簩縐嶆儏鍐碉細sum涓哄叏灞鍙橀噺銆傝繖鏄綘涓嶅繀涓簊um璧嬪垵濮嬪鹼紝鍥犱負姝ゆ椂榛樿涓茶鐨剆um鍊間負0錛岃繘鍏ユ瘡涓嚎紼嬬殑sum鍊間篃鏄?錛岃綰︽椂浠嶇劧鏄皢銆婄嚎紼嬫暟+1銆嬩釜sum鍊肩浉鍔狅紝鍥犱負浣犲茍娌℃湁瀵瑰叏灞鐨剆um璧嬪垵鍊鹼紝鎵浠ユ渶鍚庤綰︾殑緇撴灉鐪嬬潃鍍忔槸鍙湁鍚勭嚎紼嬬殑sum鍙傚姞浜嗚綰︽搷浣溿傚叾瀹炲綋浣犲皢鍏ㄥ眬鐨剆um璧嬪垵鍊兼椂錛屼綘浼氬彂鐜版渶鍚庤綰︾殑sum鍊煎張澶氬姞浜嗗叏灞鍙橀噺sum鐨勪覆琛岀▼搴忕粨鏋溿?/span> 閲嶈鎻愰啋錛氫笉綆′綘鎬庢牱璁捐sum鐨勪覆琛屽0鏄庡艦寮忥紝鍙浠栧湪琚畾涔変負瑙勭害鍙橀噺錛屾瘡嬈¤繘鍏ュ茍琛岀嚎紼嬬殑sum鍊奸兘鏄?錛?/span> 涔熻浣犳兂鎶婃瘡涓茍琛岀嚎紼嬬殑sum鍊煎垵濮嬪寲鎴愪竴涓潪0鐨勫鹼紝鐒跺悗鍐嶅悇鑷嚎紼嬩腑鍦ㄤ嬌鐢紝閭d箞鎴戝彲浠ュ憡璇変綘錛屽埆鎯充簡錛堣嚦灝戞垜娌℃湁鍋氬埌錛夈傚洜涓烘垜瑙勭害sum鍊鹼紝濡傛灉榪欎釜瑙勭害鏈夋剰涔変綘鐨勬瘡涓嚎紼嬪簲璇ユ槸鍚勮嚜鐙珛鏈洖鍚勮嚜鐨剆um鐨勶紝閭d箞榪欎釜鍒濆鍊間嬌鐢?灝卞凡緇忛潪甯稿ソ浜嗭紝鍥犱負鍚勮嚜鐨剆um璁$畻濡傛灉緇撴灉涓鏍鳳紝浣犱負浣曚笉鐩存帴鐢ㄤ竴鍙ヤ箻娉曞摢錛堢嚎紼嬫暟*涓涓嚎紼嬭綆楃殑sum鍊鹼級銆?/span> 鍥?銆佷緥6鎵ц緇撴灉 鍦ㄤ緥6涓垜浣跨敤浜唕eduction(+:sum)錛岃繖琛ㄧず姣忎釜綰跨▼瀵箂um榪欎釜鍏變韓鍙橀噺鎵ц鍔犳搷浣滄椂鍏跺畠浠諱綍綰跨▼涓嶈兘瀵瑰畠榪涜鍔犳搷浣滐紝瀹為檯涓婃垜浠繖鏍風悊瑙f槸鏈夊亸宸殑錛岀湡姝g殑鏈虹悊鍦ㄦ墽琛岀粨鏋滀腑涓嶉毦鐪嬪嚭錛屽疄闄呮瘡涓嚎紼嬮兘鎷瘋礉浜嗕竴涓猻um鐨勫壇鏈紝鍏堝湪鑷繁鎵ц鏃跺姞瀹宻um錛岀瓑鎵鏈夌嚎紼嬮兘鎵ц緇撴潫鍚庯紝涓葷嚎紼嬪啀灝嗘瘡涓嚎紼嬬殑sum鍓湰鐨勫煎姞璧鋒潵榪斿洖緇欎富綰跨▼涓璼um銆?/span> 鏈妭涓昏璁茶堪浜唂or璇彞鐨勫茍琛屽寲銆傜幇鍦ㄤ負姝㈠ぇ瀹跺簲璇ュ彲浠ョ啛緇冧嬌鐢╢or騫惰鍖栦簡銆傛枃绔犱腑鍙兘榪樻湁浜涗笉鍏ㄩ潰鐨勫湴鏂癸紝鐑垏鏈熸湜鍚勪綅璇昏呰兘緇欏嚭鎵硅瘎鍜屾寚姝o紝鏈熷緟涓?#8230;… 騫惰鍖栫紪紼嬩竴鑸彲浠ョ悊瑙d負澶氫釜綰跨▼鐨勫垱寤哄拰騫惰鍖栫紪紼嬶紝騫惰鍖栫紪紼嬬殑涓滆タ寰堝錛屼絾浠栦滑閮戒細鏈変袱涓繀欏葷殑瑙勫畾錛?銆佺▼搴忔墽琛屾ā鍨嬨?銆佸瓨鍌ㄦā鍨嬨?/span> 紼嬪簭鎵ц妯″瀷錛屼粬瑙勫畾浜嗗茍琛屽寲綰跨▼鐨勬墽琛屾柟寮忥紝瑙勫垯錛屾垨鑰呰閫昏緫緇撴瀯銆俹penMP鐨勬墽琛岄噰鐢ㄤ簡Fork-Join妯″瀷銆備富綰跨▼鍦ㄦ墽琛岃繃紼嬩腑閬囧埌瑕佸茍琛屽鐞嗙殑閮ㄥ垎錛屾牴鎹畂penMP鐨勭紪璇戞寚瀵艱鍙ユ潵鍒涘緩錛屾墽琛屽涓嚎紼嬶紝鍒涘緩鐨勭嚎紼嬩釜鏁頒竴鑸笌璁$畻鏈虹殑鏍稿績鏁版垚姝f瘮錛屽彲浠ラ氳繃娣誨姞涓涓幆澧冨彉閲忥紙OMP_NUM_THREADS錛夋潵瑙勫畾鍒涘緩綰跨▼鐨勪釜鏁幫紝娉ㄦ剰鐜鍙橀噺娣誨姞鍚庤娉ㄩ攢鎴栬呴噸鍚郴緇熸墠浼氱敓鏁堛?/span> 鍥? omp紼嬪簭鎵ц妯″瀷 瀛樺偍妯″瀷錛宱mp閽堝鐨勬槸涓涓綆楁満鎴栬呭垎甯冨紡璁$畻鏈虹殑騫惰錛屽湪涓鍙拌綆楁満涓婁粬閲囩敤鍏變韓瀛樺偍鐨勬柟寮忥紝澶氫釜綰跨▼鍏變韓涓鍧楄繘紼嬬殑鍐呭瓨璧勬簮銆?/span> 涓嬮潰鍏堝啓涓▼搴忎緥瀛愶紝鑳借澶у鏈変釜鍒濇璁よ瘑銆傝繖涓▼搴忔槸鍦╒S2008涓紪璇戠殑錛岄」鐩被鍨嬩負Win32ConsoleApplication銆?/span> 渚?銆佸茍琛孒elloWorld紼嬪簭: 姝ょ▼搴忕紪璇戜箣鍓嶏紝榪橀渶瑕佷綘瀵逛綘鐨勭紪璇戝櫒欏圭洰灞炴ц緗竴涓嬨傝繖閲屾垜浠互VS2008涓轟緥錛岄鍏堣緗」鐩敮鎸乷penMP銆傚彸鍑婚」鐩?>灞炴?>C/C++->璇█->openMP鏀寔淇敼涓烘槸錛屽鍥?鎵紺猴紝鐒跺悗浠g爜鐢熸垚淇敼涓哄綰跨▼璋冭瘯錛屽鍥?鎵紺恒傛墽琛岀粨鏋滃鍥?鎵紺恒?/span> 鍥?銆佹坊鍔爋penMP鏀寔 鍥?銆佸綰跨▼璋冭瘯鏀寔 鍥?銆佹墽琛岀粨鏋?/p>
浠ヤ笂紼嬪簭鎴戝茍娌℃湁璁劇疆鐜鍙橀噺錛屽洜涓烘垜鐨勮綆楁満鏄弻鏍哥殑錛屾墍浠ヤ粬鐨勫茍琛岄儴鍒嗚緭鍑轟簡涓よHello World錛?Parallel錛岃繖璇存槑浠栨湁涓や釜綰跨▼鎵ц騫惰閮ㄥ垎錛屾瘡涓嚎紼嬪畬鍏ㄦ墽琛屼簡鐩稿悓鐨勪竴孌電▼搴忋傛垜浠湪璁劇疆涓涓嬬幆澧冨彉閲忓悗鍦ㄦ墽琛屼竴涓嬨傞『渚胯鏄庝竴涓嬫庢牱璁劇疆鐜鍙橀噺銆?/span> 璁$畻鏈哄彸鍑?銆嬪睘鎬?銆嬮珮綰?銆嬬幆澧冨彉閲?銆嬬郴緇熷彉閲?銆嬫柊寤恒傘傘傚鍥?鎵紺恒?/span> 鍥?銆乄in7鐜涓嬭緗幆澧冨彉閲?/p>
璁劇疆瀹岀幆澧冨悗錛屾敞閿鎴栭噸鍚郴緇熷悗錛屽啀嬈℃墽琛屼緥1鐨勭▼搴忓悗寰楀埌鐨勭粨鏋滀腑Hello World錛?Parallel 灝嗚鎵ц鍥涢亶銆傚洜涓轟綘宸茬粡璁劇疆浜嗗洓涓嚎紼嬩簡銆?/span> 鍒扮幇鍦ㄤ負姝紝澶у鍙互妯′豢鐫渚?鍐欏嚑涓皬紼嬪簭浜嗭紝鍙槸榪樻湁涓鍙ヨ瘽澶у鍙兘榪樹笉澶ф槑鐧藉惂錛?pragma omp parallel榪欏彞璇濇爣璁皗}涓殑紼嬪簭灝嗗湪OMP_NUM_THREADS涓嚎紼嬩腑鎵ц銆?/span> 鍦ㄤ笅闈㈢殑鍑犵瘒鏂囩珷涓垜灝嗙戶緇瑙penMP緙栫▼鐨勫熀紜鐭ヨ瘑銆傛榪庣戶緇叧娉ㄣ?/span>
騫惰鍖哄煙鐨勭紪璇戞寚瀵艱鍙ヤ竴鑸牸寮?/span>
渚嬪瓙瀹炰緥
#include
#include "omp.h"
int main(int argc, char* argv[])
{
#pragma omp parallel
for (int i = 0; i < 2; i++)
{
printf("Hello World! i = %d, Thread Num = %d/n", i, omp_get_thread_num());
}
return 0;
}
#include
#include "omp.h"
int sum = 0;
#pragma omp threadprivate(sum)
int main(int argc, char* argv[])
{
#pragma omp parallel
{
sum += omp_get_thread_num();
printf("parallel sum = %d; thread num = %d/n", sum, omp_get_thread_num());
}
printf("/nserial sum = %d; thread num = %d/n/n", sum, omp_get_thread_num());
#pragma omp parallel
printf("parallel sum = %d; thread num = %d/n", sum, omp_get_thread_num());
return 0;
}
#include <stdio.h>
#include "omp.h"
int sum;
#pragma omp threadprivate(sum)
int main(int argc, char* argv[])
{
sum = 100;
#pragma omp parallel copyin(sum)
{
sum += omp_get_thread_num();
printf("parallel sum = %d; thread num = %d/n", sum, omp_get_thread_num());
}
printf("/nserial sum = %d; thread num = %d/n/n", sum, omp_get_thread_num());
#pragma omp parallel
printf("parallel sum = %d; thread num = %d/n", sum, omp_get_thread_num());
return 0;
}
]]>
openMP騫朵笉鏄彧鑳藉寰幆鏉ュ茍琛岀殑錛屽驚鐜茍琛屽寲鍗曠嫭鎷垮嚭鏉ヨ鏄洜涓哄畠鍦ㄧ瀛﹁綆椾腑闈炲父鏈夌敤錛屾瘮濡傚悜閲忋佺煩闃電殑璁$畻銆傛墍浠ユ垜鍗曠嫭鎷垮嚭榪欎竴閮ㄥ垎緇欏ぇ瀹惰璁層傝繖閲屼富瑕佽瑙g殑鏄痜or寰幆銆?
緙栬瘧鎸囧璇彞錛?/h3>
騫惰鍖杅or鐨勭紪鍐欒鍒?/span>
渚嬪瓙璁茶В
#include
#include "omp.h"
int main(int argc, char* argv[])
{
int i;
#pragma omp parallel for
for (i = 0; i < 12; i++)
{ printf("i = %d %d/n", i, omp_get_thread_num()); }
return 0;
}騫惰緙栬瘧瀛愬彞
鐢ㄥ疄渚嬭瑙f暟鎹綔鐢ㄥ煙瀛愬彞
#include "omp.h"
int main(int argc, char* argv[])
{
float x = 4.3f;
int i;
#pragma omp parallel for private(x)
for (i = 0; i < 12; i++)
{
x = 0;
printf("parallel x = %.1f, thread nummber:%d/n", x, omp_get_thread_num());
}
printf("/nserial x = %.1f, thread nummber:%d/n", x, omp_get_thread_num());
return 0;
}
#include
#include "omp.h"
int main(int argc, char* argv[])
{
float x = 4.3f;
int i;
#pragma omp parallel for firstprivate(x)
for (i = 0; i < 12; i++)
{
x += 1.0f;
printf("parallel x = %.1f, thread nummber:%d/n", x, omp_get_thread_num());
}
printf("/nserial x = %.1f, thread nummber:%d/n", x, omp_get_thread_num());
return 0;
}
#include
#include "omp.h"
int main(int argc, char* argv[])
{
float x = 4.3f;
int i;
#pragma omp parallel for lastprivate(x)
for (i = 0; i < 12; i++)
{
x = 0.0f;
printf("parallel x = %.1f, thread nummber:%d/n", x, omp_get_thread_num());
}
printf("/nserial x = %.1f, thread nummber:%d/n", x, omp_get_thread_num());
return 0;
}
#include
#include "omp.h"
int main(int argc, char* argv[])
{
float x = 4.3f;
int i;
#pragma omp parallel for firstprivate(x) lastprivate(x)
for (i = 0; i < 12; i++)
{
x += (float)omp_get_thread_num();
printf("parallel x = %.1f, thread nummber:%d/n", x, omp_get_thread_num());
}
printf("/nserial x = %.1f, thread nummber:%d/n", x, omp_get_thread_num());
return 0;
}
#include
#include "omp.h"
int main(int argc, char* argv[])
{
float x = 0.0f;
int i;
float sum = 0.0f;
#pragma omp parallel for private(x) reduction(+:sum)
for (i = 0; i < 12; i++)
{
x = (float)omp_get_thread_num();
sum += x;
printf("parallel sum = %.1f, thread nummber:%d/n", sum, omp_get_thread_num());
}
printf("/nserial sum = %.1f, thread nummber:%d/n", sum, omp_get_thread_num());
return 0;
}灝忕粨
]]>
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#include <stdio.h>
#include "omp.h"
int main(int argc, char* argv[])
{
printf("Hello World! Serial Begin./n");
#pragma omp parallel //寮濮嬪茍琛屾墽琛?nbsp;
{ printf("Hello World! Parallel/n"); }
printf("Hello World! Serial again./n");
return 0;
}
]]>