锘??xml version="1.0" encoding="utf-8" standalone="yes"?>久久女同互慰一区二区三区,亚洲精品国产精品国产自,国产一区二区三区久久http://www.shnenglu.com/range/瀵繪壘涓栫晫鐨勫績錛屽鎵捐嚜宸辯殑蹇?zh-cnWed, 24 Sep 2025 03:17:25 GMTWed, 24 Sep 2025 03:17:25 GMT60unix鍏變韓鍐呭瓨瑕佺偣http://www.shnenglu.com/range/archive/2012/07/23/184665.htmlRangeRangeSun, 22 Jul 2012 16:08:00 GMThttp://www.shnenglu.com/range/archive/2012/07/23/184665.htmlhttp://www.shnenglu.com/range/comments/184665.htmlhttp://www.shnenglu.com/range/archive/2012/07/23/184665.html#Feedback0http://www.shnenglu.com/range/comments/commentRss/184665.htmlhttp://www.shnenglu.com/range/services/trackbacks/184665.html鍏變韓鍐呭瓨浼樼偣錛?.鍦ㄨ繘紼嬩箣闂翠笉閫氳繃鍐呮牳浼犻掓暟鎹紝鍗充笉閫氳繃緋葷粺璋冪敤鎷瘋礉鏁版嵁錛岃揪鍒板揩閫燂紝楂樻晥鐨勬暟鎹紶杈撱?br />                    2.闅忓唴鏍告寔緇?br />*nix鐨勫叡浜唴瀛樻湁涓ゅAPI錛歅osix鍜孲ystem V

涓よ呯殑涓昏宸埆鏄叡浜唴瀛樼殑澶у皬
1.Posix鍏變韓鍐呭瓨澶у皬鍙氳繃鍑芥暟ftruncate闅忔椂淇敼
2.System V鍏變韓鍐呭瓨澶у皬鍦ㄥ垱寤烘椂灝卞凡緇忕‘瀹氾紝鑰屼笖鏈澶у兼牴鎹郴緇熸湁鎵涓嶅悓

 Posix鍏變韓鍐呭瓨 
    #include <sys/mman.h>  錛坢map錛宮unmap錛宮sync錛宻hm_open錛宻hm_unlink錛?br />
鏈涓昏鐨勫嚱鏁? -- mmap
     void* mmap(void* addr,size_t len,int prot,int flags,int fd,off_t offset)
     鍑芥暟灝嗕竴涓彞鏌勬槧灝勫埌鍐呭瓨涓紝榪欎釜鍙ユ焺鍙互鏄痮pen鐨勬枃浠跺彞鏌勶紝涔熷彲浠ユ槸shm_open鐨勫叡浜唴瀛樺尯瀵硅薄銆傚綋fd=-1鏃朵負(fù)鍖垮悕鍏變韓鍐呭瓨銆?br />     *nix涓鍒囩殕鏂囦歡鐨勮鐐癸紝shm_open涔熸槸鍦?dev/shm鐩綍涓嬪垱寤轟竴涓枃浠跺璞★紝榪斿洖瀵硅薄鐨勬弿榪扮銆?br />     mmap灝嗗彞鏌勪綔涓哄叡浜唴瀛樼殑搴曞眰鏀拺瀵硅薄錛屾槧灝勫埌鍐呭瓨涓紝榪欐牱鍙互涓嶉氳繃read銆亀rite鍦ㄨ繘紼嬩箣闂村叡浜唴瀛樸傜敱姝ゆ帹嫻嬩竴涓嬶紝鍦?nix鐨勮繘紼嬮棿浼犻掓暟鎹洿鍔犲師濮嬬殑鏂規(guī)硶鏄繘紼嬮棿璇誨啓涓涓枃浠躲備絾鏄綣佺殑open銆乺ead銆亀rite銆乴seek緋葷粺璋冪敤浼?xì)娑堣楄繃澶氱殑璁＄畻璧勬簮銆傛墍浠ユ兂鍒頒簡灝嗚繖涓枃浠跺彞鏌勬槧灝勫埌鍐呭瓨涓紝榪欐牱灝辨彁楂樹簡榪涚▼闂翠紶閫掓暟鎹殑鏁堢巼銆?br />
闇瑕佹敞鎰忕殑鍑芥暟 -- msync
      褰撲慨鏀逛簡鍐呭瓨鏄犲皠鍖虹殑鍐呭瓨鍚庯紝鍐呮牳浼?xì)鍦ㄦ煇涓椂鍒粸畣鏂囦欢鐨勫唴瀹规洿鏂般備負(fù)浜嗙‘淇℃枃浠惰鏇存柊錛岃皟鐢ㄥ嚱鏁癿sync銆傛枃浠剁殑鏇存柊鍙互鏄悓姝ワ紙MS_SYNC錛変篃鍙互鏄紓姝ワ紙MS_ASYNC錛夈傦紙浼拌榪欓噷涔熸槸璋冪敤浜嗗嚱鏁皐rite鏇存柊鏂囦歡錛?br />
System V鍏變韓鍐呭瓨
    #include <sys/shm.h>  (shmget,shmat,shmdt,shmctl)
鐢變簬System V鐨勫叡浜唴瀛樻湁澶у皬鐨勯檺鍒訛紝鎵浠ュ彲鑰冭檻錛屼嬌鐢ㄥ叡浜唴瀛樻暟緇勬潵瑙ｅ喅榪欎釜闂傝櫧鐒舵暟緇勭殑澶у皬鍗充竴涓繘紼嬪彲浠ヨ幏鍙栧叡浜唴瀛樼殑鏁伴噺涔熸槸鏈夐檺鍒訛紝浣嗘槸鍙互緙撹ВSystem V鍗曚釜鍏變韓鍐呭瓨榪囧皬鐨勯棶棰樸?img src ="http://www.shnenglu.com/range/aggbug/184665.html" width = "1" height = "1" />

Range 2012-07-23 00:08 鍙戣〃璇勮
]]>erlang Receive鐨勫伐浣滄満鍒?/title><link>http://www.shnenglu.com/range/archive/2012/07/01/181020.html</link><dc:creator>Range</dc:creator><author>Range</author><pubDate>Sun, 01 Jul 2012 09:17:00 GMT</pubDate><guid>http://www.shnenglu.com/range/archive/2012/07/01/181020.html</guid><wfw:comment>http://www.shnenglu.com/range/comments/181020.html</wfw:comment><comments>http://www.shnenglu.com/range/archive/2012/07/01/181020.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.shnenglu.com/range/comments/commentRss/181020.html</wfw:commentRss><trackback:ping>http://www.shnenglu.com/range/services/trackbacks/181020.html</trackback:ping><description><![CDATA[<div>receive works as follows:</div><div>1. When we enter a receive statement, we start a timer (but only if an after section is present in the expression).</div><div>2. Take the first message in the mailbox and try to match it against Pattern1, Pattern2, and so on. If the match succeeds, the message is removed from the mailbox, and the expressions following the pattern are evaluated.</div><div>3. If none of the patterns in the receive statement matches the first message in the mailbox, then the first message is removed from the mailbox and put into a “save queue.” The second message in the mailbox is then tried. This procedure is repeated until a matching message is found or until all the messages in the mailbox have been examined.</div><div><div>4. If none of the messages in the mailbox matches, then the process is suspended and will be rescheduled for execution the next time a new message is put in the mailbox. Note that when a new message arrives, the messages in the save queue are not rematched; only the new message is matched.</div><div>5. As soon as a message has been matched, then all messages that have been put into the save queue are reentered into the mailbox in the order in which they arrived at the process. If a timer was set, it is cleared.</div><div>6. If the timer elapses when we are waiting for a message, then evaluate the expressions ExpressionsTimeout and put any saved messages back into the mailbox in the order in which they arrived at the process.</div></div><img src ="http://www.shnenglu.com/range/aggbug/181020.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.shnenglu.com/range/" target="_blank">Range</a> 2012-07-01 17:17 <a href="http://www.shnenglu.com/range/archive/2012/07/01/181020.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>strcasestr鍑芥暟http://www.shnenglu.com/range/archive/2011/10/09/157888.htmlRangeRangeSun, 09 Oct 2011 11:12:00 GMThttp://www.shnenglu.com/range/archive/2011/10/09/157888.htmlhttp://www.shnenglu.com/range/comments/157888.htmlhttp://www.shnenglu.com/range/archive/2011/10/09/157888.html#Feedback0http://www.shnenglu.com/range/comments/commentRss/157888.htmlhttp://www.shnenglu.com/range/services/trackbacks/157888.html
       #define _GNU_SOURCE

       #include <string.h>

       char *strcasestr(const char *haystack, const char *needle);

        鐢ㄤ簬鍦╟涓瞙aystack涓煡鎵綾涓瞡eedle錛屽拷鐣ュぇ灝忓啓銆傚鏋滄壘鍒板垯榪斿洖needle涓插湪haystack涓蹭腑絎竴嬈″嚭鐜扮殑浣嶇疆鐨刢har鎸囬拡

        鍦ㄥ疄闄呯殑搴旂敤涓鏋滃彧鍔犱笂澶存枃浠訛紝褰撶紪璇戞椂浼?xì)鍑虹? warning: assignment makes pointer from integer without a cast

       榪欐槸鍥犱負(fù)鍑芥暟鐨勫０鏄庡湪璋冪敤涔嬪悗銆傛湭緇忓０鏄庣殑鍑芥暟榛樿榪斿洖int鍨嬨?/span>
 
       鍥犳瑕佸湪#include鎵鏈?/span>澶存枃浠朵箣鍓嶅姞  
#define _GNU_SOURCE  錛屼互姝よВ鍐蟲闂銆?/span>


Range 2011-10-09 19:12 鍙戣〃璇勮
]]>鏈嶅姟鍣ㄩ珮鎬ц兘紼嬪簭 紓佺洏I(yè)/O綃?/title><link>http://www.shnenglu.com/range/archive/2011/08/26/154449.html</link><dc:creator>Range</dc:creator><author>Range</author><pubDate>Fri, 26 Aug 2011 12:04:00 GMT</pubDate><guid>http://www.shnenglu.com/range/archive/2011/08/26/154449.html</guid><wfw:comment>http://www.shnenglu.com/range/comments/154449.html</wfw:comment><comments>http://www.shnenglu.com/range/archive/2011/08/26/154449.html#Feedback</comments><slash:comments>2</slash:comments><wfw:commentRss>http://www.shnenglu.com/range/comments/commentRss/154449.html</wfw:commentRss><trackback:ping>http://www.shnenglu.com/range/services/trackbacks/154449.html</trackback:ping><description><![CDATA[<div><p>Linux IO<span style="font-family:瀹嬩綋;">緋葷粺鐨勬灦鏋勫浘</span></p> <p><img src="http://www.shnenglu.com/images/cppblog_com/range/21.jpg" width="326" height="433" alt="" /><br /></p> <p> </p> <p style="margin-left:21.0pt;text-indent:-21.0pt;"><span><span>涓錛?/span><span style="font-family:瀹嬩綋;">璁懼</span>-------- </span><span style="font-family:瀹嬩綋;">褰卞搷紓佺洏鎬ц兘鐨勫洜绱?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span style="font-family:瀹嬩綋;">紜洏鐨勮漿閫熷獎(jiǎng)鍝嶇‖鐩樼殑鏁翠綋鎬ц兘銆備竴鑸儏鍐典笅杞熻秺澶э紝鎬ц兘浼?xì)瓒婂ソ銆?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span style="font-family:瀹嬩綋;">紜洏鐨勬ц兘鍥犵礌涓昏鍖呮嫭涓や釜錛?.</span><span style="font-family:瀹嬩綋;">騫沖潎璁塊棶鏃墮棿2</span><span style="font-family:瀹嬩綋;">浼犺緭閫熺巼銆?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"> </p> <p style="margin-left:21.0pt;text-indent:0cm;"><span style="font-family:瀹嬩綋;">騫沖潎璁塊棶鏃墮棿鍖呮嫭涓ゆ柟闈㈠洜绱狅細(xì)</span></p> <p style="margin-left:21.0pt;"><span style="font-family:瀹嬩綋;">騫沖潎瀵婚亾鏃墮棿</span><span><span><span style="font-family:"Arial","sans-serif";color:black">(Average Seek Time)</span></span></span><span><span><span style="font-family:瀹嬩綋; color:black">鏄寚紜洏鐨勭澶寸Щ鍔ㄥ埌鐩橀潰鎸囧畾紓侀亾鎵闇鐨勬椂闂?/span></span></span><span style="font-family:瀹嬩綋;">銆備竴鑸湪3ms</span><span style="font-family:瀹嬩綋;">鑷?5ms</span><span style="font-family:瀹嬩綋;">涔嬮棿銆?/span></p> <p style="margin-left:21.0pt;"><span style="font-family:瀹嬩綋;">騫沖潎鏃嬭漿絳夊緟鏃墮棿</span><span><span style="font-family:"Arial","sans-serif";color:black">(Latency)</span></span><span><span style="font-family:瀹嬩綋;color:black">鏄寚紓佸ご宸插浜庤璁塊棶鐨勭閬擄紝絳夊緟鎵瑕佽闂殑鎵囧尯鏃嬭漿鑷崇澶翠笅鏂圭殑鏃墮棿銆?/span></span><span style="font-family:瀹嬩綋;">涓鑸湪2ms</span><span style="font-family:瀹嬩綋;">鑷?ms</span><span style="font-family:瀹嬩綋;">涔嬮棿銆?/span></p> <p style="margin-left:21.0pt;"> </p> <p style="margin-left:21.0pt;"><span style="font-family:瀹嬩綋;">浼犺緭閫熺巼(Data Transfer Rate) </span><span style="font-family:瀹嬩綋;">紜洏鐨勬暟鎹紶杈撶巼鏄寚紜洏璇誨啓鏁版嵁鐨勯熷害錛屽崟浣嶄負(fù)鍏嗗瓧鑺傛瘡縐掞紙MB/s</span><span style="font-family:瀹嬩綋;">錛夈傜鐩樻瘡縐掕兘浼犺緭80M~320M</span><span style="font-family:瀹嬩綋;">瀛楄妭銆?/span></p> <p style="margin-left:21.0pt;"> </p> <p style="margin-left:21.0pt;"><span style="font-family:瀹嬩綋;">浼犺緭閫熺巼鍖呮嫭鍐呴儴浼犺緭閫熺巼鍜屽閮ㄤ紶杈撻熺巼銆?/span></p> <p style="margin-left:21.0pt;"><span style="font-family:瀹嬩綋;">鍐呴儴浼犺緭鐜?Internal Transfer Rate) </span><span style="font-family:瀹嬩綋;">涔熺О涓烘寔緇紶杈撶巼(Sustained Transfer Rate)</span><span style="font-family:瀹嬩綋;">錛屽畠鍙嶆槧浜嗙‖鐩?/span><a target="_blank"><span><span style="font-family:瀹嬩綋; color:windowtext;text-decoration:none;text-underline:none">緙撳啿鍖?/span></span></a><span style="font-family:瀹嬩綋;">鏈敤鏃剁殑鎬ц兘銆傚唴閮ㄤ紶杈撶巼涓昏渚濊禆浜庣‖鐩樼殑鏃嬭漿閫熷害銆?/span></p> <p style="margin-left:21.0pt;"><span style="font-family:瀹嬩綋;">澶栭儴浼犺緭鐜囷紙External Transfer Rate</span><span style="font-family:瀹嬩綋;">錛変篃縐頒負(fù)</span><a target="_blank"><span><span style="font-family:瀹嬩綋; color:windowtext;text-decoration:none;text-underline:none">紿佸彂鏁版嵁浼犺緭鐜?/span></span></a><span style="font-family:瀹嬩綋;">錛?span>Burst Data Transfer Rate</span></span><span style="font-family:瀹嬩綋;">錛夋垨鎺ュ彛浼犺緭鐜囷紝瀹冩爣縐扮殑鏄?/span><a target="_blank"><span><span style="font-family:瀹嬩綋; color:windowtext;text-decoration:none;text-underline:none">緋葷粺鎬葷嚎</span></span></a><span style="font-family:瀹嬩綋;">涓庣‖鐩樼紦鍐插尯涔嬮棿鐨勬暟鎹紶杈撶巼錛屽閮ㄦ暟鎹紶杈撶巼涓?/span><a target="_blank"><span><span style="font-family:瀹嬩綋; color:windowtext;text-decoration:none;text-underline:none">紜洏鎺ュ彛綾誨瀷</span></span></a><span style="font-family:瀹嬩綋;">鍜?/span><a target="_blank"><span><span style="font-family:瀹嬩綋; color:windowtext;text-decoration:none;text-underline:none">紜洏緙撳瓨</span></span></a><span style="font-family:瀹嬩綋;">鐨勫ぇ灝忔湁鍏熾係TAT2 </span><span style="font-family:瀹嬩綋;">鐨勪紶杈撻熺巼鍦?00MB/s</span><span style="font-family:瀹嬩綋;">綰у埆銆?/span></p> <p style="margin-left:21.0pt;"> </p> <p style="text-indent:20.25pt"><span style="font-family:瀹嬩綋;">鍥犳鍦ㄧ‖浠剁駭涓婏紝鎻愰珮紓佺洏鎬ц兘鐨勫叧閿富瑕佹槸闄嶄綆騫沖潎璁塊棶鏃墮棿銆?/span></p> <p style="margin-left:21.0pt;text-indent:-21.0pt;"><span><span>浜岋紟</span><span style="font-family:瀹嬩綋;">璁懼椹卞姩</span></span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span style="font-family:瀹嬩綋;">鍐呭瓨鍒扮‖鐩樼殑浼犺緭鏂瑰紡錛歱oll</span><span style="font-family:瀹嬩綋;">錛屼腑鏂紝DMA</span></p> <p style="margin-left:21.0pt;text-indent:0cm;"> </p> <p style="margin-left:21.0pt;text-indent:0cm;"><span>DMA</span><span style="font-family:瀹嬩綋;">錛氬綋 CPU </span><span style="font-family:瀹嬩綋;">鍒濆鍖栬繖涓紶杈撳姩浣滐紝浼犺緭鍔ㄤ綔鏈韓鏄敱 DMA </span><span style="font-family:瀹嬩綋;">鎺у埗鍣?nbsp;</span><span style="font-family:瀹嬩綋;">鏉ュ疄琛屽拰瀹屾垚銆?/span></p> <p style="margin-left:52.5pt; text-indent:-31.5pt;"><span>DMA</span><span style="font-family:瀹嬩綋;">鎺у埗鍣ㄨ幏寰楁葷嚎鎺у埗鏉冨悗錛孋PU</span><span style="font-family:瀹嬩綋;">鍗沖埢鎸傝搗鎴栧彧鎵ц鍐呴儴鎿嶄綔錛岀敱DMA</span><span style="font-family:瀹嬩綋;">鎺у埗鍣ㄨ緭鍑鴻鍐欏懡浠わ紝鐩存帴鎺у埗RAM</span><span style="font-family:瀹嬩綋;">涓嶪/O</span><span style="font-family:瀹嬩綋;">鎺ュ彛榪涜DMA</span><span style="font-family:瀹嬩綋;">浼犺緭銆侱MA</span><span style="font-family:瀹嬩綋;">姣忔浼犻佺殑鏄鐩樹笂鐩擱偦鐨勬墖鍖恒係catter-gather DMA</span><span style="font-family:瀹嬩綋;">鍏佽浼犻佷笉鐩擱偦鐨勬墖鍖恒?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"> </p> <p style="margin-left:21.0pt;text-indent:0cm;"><span>CPU</span><span style="font-family:瀹嬩綋;">鎬ц兘涓庣‖鐩樹笌鍐呭瓨鐨勬暟鎹紶杈撻熺巼鍏崇郴涓嶅ぇ銆?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"> </p> <p style="margin-left:21.0pt;text-indent:0cm;"><span style="font-family:瀹嬩綋;">璁懼椹卞姩鍐呮湁涓涓粨鏋勭鐞嗙潃IO</span><span style="font-family:瀹嬩綋;">鐨勮姹傞槦鍒?/span></p> <p style="margin-left:21.0pt;"><span>structrequest_queue</span><span style="font-family:瀹嬩綋;">錛坕nclude/linux/Blkdev.h</span><span style="font-family:瀹嬩綋;">錛?/span></p> <p style="margin-left:21.0pt;"><span style="font-family:瀹嬩綋;">榪欓噷涓嶄粎浠呮湁璇誨啓璇鋒眰鐨勬暟鎹潡錛岃繕鏈夌敤浜嶪O</span><span style="font-family:瀹嬩綋;">璋冨害鐨勫洖璋冨嚱鏁扮粨鏋勩傛瘡嬈￠渶瑕佷紶杈撶殑鏃跺欙紝灝變粠闃熷垪涓夊嚭涓涓暟鎹潡浜ょ粰DMA</span><span style="font-family:瀹嬩綋;">榪涜浼犺緭銆?/span></p> <p style="margin-left:21.0pt;"> </p> <p style="margin-left:21.0pt;"><span style="font-family:瀹嬩綋;">鎵浠?a name="_GoBack">IO</a></span><span><span style="font-family:瀹嬩綋;">璋冨害鐨勫洖璋冨嚱鏁拌繖鏄檷浣庡鉤鍧囪闂殑鏃墮棿</span></span><span style="font-family:瀹嬩綋;">鐨勫叧閿?/span></p> <p> </p> <p style="margin-left:21.0pt;text-indent:-21.0pt;"><span><span>涓夛紟</span>OS</span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span>IO</span><span style="font-family:瀹嬩綋;">璋冨害鍣?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span>Linux kernel</span><span style="font-family:瀹嬩綋;">鎻愪緵浜嗗洓涓皟搴﹀櫒渚涚敤鎴烽夋嫨銆備粬浠槸noop,cfq,deadline,as</span><span style="font-family:瀹嬩綋;">銆傚彲浠ュ湪緋葷粺鍚姩鏃惰緗唴鏍稿弬鏁癳levator=<name></span><span style="font-family:瀹嬩綋;">鏉ユ寚瀹氶粯璁ょ殑璋冨害鍣ㄣ備篃鍙互鍦ㄨ繍琛屾椂涓烘煇涓潡璁懼璁劇疆IO</span><span style="font-family:瀹嬩綋;">璋冨害紼嬪簭銆?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"> </p> <p style="margin-left:21.0pt;text-indent:0cm;"><span style="font-family:瀹嬩綋;">涓嬮潰鏉ョ畝瑕佷粙緇嶈繖鍥涗釜璋冨害鍣ㄧ殑鐢墊璋冨害綆楁硶銆?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span>Noop</span><span style="font-family:瀹嬩綋;">錛氭渶綆鍗曠殑璋冨害綆楁硶銆傛柊鐨勮姹傛繪槸琚坊鍔犲埌闃熷ご鎴栬呴槦灝撅紝鐒跺悗鎬繪槸浠庨槦澶翠腑閫夊嚭灝嗚琚鐞嗙殑璇鋒眰銆?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"> </p> <p style="margin-left:21.0pt;text-indent:0cm;"><span>CFQ</span><span style="font-family:瀹嬩綋;">錛氾紙Complete FarinessQueueing</span><span style="font-family:瀹嬩綋;">錛夊畠鐨勭洰鏍囨槸鍦ㄦ墍鏈夎姹傜殑榪涚▼涓鉤鍧囧垎閰岻O</span><span style="font-family:瀹嬩綋;">鐨勫甫瀹姐傚洜姝わ紝瀹冧細(xì)鏍規(guī)嵁榪涚▼鍒涘緩鑷繁鐨勮姹傞槦鍒楋紝鐒跺悗灝咺O</span><span style="font-family:瀹嬩綋;">璇鋒眰鏀懼叆鐩稿簲鐨勯槦鍒椾腑銆傚湪浣跨敤杞漿娉曚粠姣忎釜闈炵┖鐨勯槦鍒椾腑鍙栧嚭IO</span><span style="font-family:瀹嬩綋;">璇鋒眰銆?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"> </p> <p style="margin-left:21.0pt;text-indent:0cm;"><span>Deadline</span><span style="font-family:瀹嬩綋;">錛氫嬌鐢ㄤ簡鍥涗釜闃熷垪錛屼袱涓互紓佺洏鍧楀簭鍙鋒帓搴忕殑璇誨啓闃熷垪錛屼袱涓互鏈鍚庢湡闄愭椂闂存帓搴忕殑璇誨啓闃熷垪銆傜畻娉曢鍏堢‘瀹氫笅涓涓鍐欑殑鏂瑰悜錛岃鐨勪紭鍏堢駭楂樹簬鍐欍傜劧鍚庢鏌ヨ閫夋柟鍚戠殑鏈鍚庢湡闄愰槦鍒楋細(xì)濡傛灉鏈鍚庢湡闄愭椂闂寸殑闃熷垪涓湁瓚呮椂鐨勮姹傦紝鍒欏皢鍒氭墠鐨勮姹傜Щ鍔ㄨ嚦闃熷熬錛岀劧鍚庡湪紓佺洏鍙鋒帓搴忛槦鍒椾腑浠庤秴鏃惰姹傚紑濮嬪鐞嗐傚綋澶勭悊瀹屼竴涓柟鍚戠殑璇鋒眰鍚庯紝鍦ㄥ鐞嗗彟涓涓柟鍚戠殑璇鋒眰銆傦紙璇昏姹傜殑瓚呮椂鏃墮棿鏄?00ms</span><span style="font-family:瀹嬩綋;">錛屽啓璇鋒眰鐨勮秴鏃舵椂闂存槸5s</span><span style="font-family:瀹嬩綋;">錛?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"> </p> <p style="margin-left:21.0pt;text-indent:0cm;"><span>Anticipatory</span><span style="font-family:瀹嬩綋;">錛氬畠鏄渶澶嶆潅鐨処O</span><span style="font-family:瀹嬩綋;">璋冨害綆楁硶銆傚拰deadline</span><span style="font-family:瀹嬩綋;">綆楁硶涓鏍鋒湁鍥涗釜闃熷垪銆傝繕闄勫甫浜嗕竴浜涘惎鍙戝紡絳栫暐銆傚畠浼?xì)浠庡綋鍓嶇殑纾佸ご浣嵕|悗鐨勭鐩樺彿涓夋嫨璇鋒眰銆傚湪璋冨害浜嗕竴涓敱P</span><span style="font-family:瀹嬩綋;">榪涚▼鐨処O</span><span style="font-family:瀹嬩綋;">璇鋒眰鍚庯紝浼?xì)妫鏌ヤ笅涓涓姹傦紝濡傛灉榪樻槸P</span><span style="font-family:瀹嬩綋;">榪涚▼鐨勮姹傦紝鍒欑珛鍗寵皟搴︼紝濡傛灉涓嶆槸錛屽悓鏃墮嫻婸</span><span style="font-family:瀹嬩綋;">榪涚▼寰堝揩浼?xì)鍙戝國櫙锋眰锛屽垯杩樺粔檿垮ぇ绾?ms</span><span style="font-family:瀹嬩綋;">鐨勬椂闂寸瓑寰匬</span><span style="font-family:瀹嬩綋;">榪涚▼鐨処O</span><span style="font-family:瀹嬩綋;">璇鋒眰銆?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"> </p> <p style="margin-left:21.0pt;text-indent:0cm;"> </p> <p style="margin-left:21.0pt;text-indent:0cm;"> </p> <p style="margin-left:21.0pt;text-indent:0cm;"><span>Write/Read</span><span style="font-family:瀹嬩綋;">鍑芥暟</span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span style="font-family:瀹嬩綋;">浠xt3</span><span style="font-family:瀹嬩綋;">鐨剋rite</span><span style="font-family:瀹嬩綋;">涓轟緥錛?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span style="font-family:瀹嬩綋;">緋葷粺璋冪敤write()</span><span style="font-family:瀹嬩綋;">鐨勪綔鐢ㄥ氨鏄慨鏀歸〉楂橀熺紦瀛樺唴鐨勪竴浜涢〉鐨勫唴瀹癸紝濡傛灉欏甸珮閫熺紦瀛樺唴娌℃湁鎵瑕佺殑欏靛垯鍒嗛厤騫惰拷鍔犺繖浜涢〉銆?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span style="font-family:瀹嬩綋;">褰撹剰欏佃揪鍒頒竴瀹氭暟閲忔垨鑰呰秴鏃跺悗錛屽皢鑴忛〉鍒峰洖紜洏銆備篃鍙互鎵ц鐩稿叧緋葷粺璋冪敤銆?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"> </p> <p style="margin-left:21.0pt;text-indent:0cm;"><span style="font-family:瀹嬩綋;">涓轟粈涔堣杈懼埌涓瀹氭暟閲忥紝鏄洜涓哄歡榪熷啓鑳藉湪涓瀹氬眰搴︿笂鎻愰珮緋葷粺鐨勬ц兘錛岃繖涔熶嬌寰楀潡璁懼鐨勫鉤鍧囪璇鋒眰浼?xì)澶氫簬鍐欒h眰銆?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"> </p> <p style="margin-left:21.0pt;text-indent:0cm;"><span style="font-family:瀹嬩綋;">鍦ㄧ▼搴忎腑璋冪敤write</span><span style="font-family:瀹嬩綋;">鍑芥暟錛屽皢榪涘叆緋葷粺璋冪敤f_op->write</span><span style="font-family:瀹嬩綋;">銆傝繖涓嚱鏁板皢璋冪敤ext3</span><span style="font-family:瀹嬩綋;">鐨刣o_sync_write</span><span style="font-family:瀹嬩綋;">銆傝繖涓嚱鏁板皢鍙傛暟灝佽鍚庤皟鐢╣eneric_file_aio_write</span><span style="font-family:瀹嬩綋;">銆傜敱鍙傛暟鍚嶅彲浠ョ湅鍑哄悓姝ュ啓鍙樻垚浜嗗紓姝ュ啓銆傚鏋滄病鏈夋爣璁癘_DIRECT</span><span style="font-family:瀹嬩綋;">錛屽皢璋冪敤鍑芥暟generic_file_buffered_write</span><span style="font-family:瀹嬩綋;">灝嗗啓鐨勫唴瀹瑰啓榪沰ernel</span><span style="font-family:瀹嬩綋;">鐨勯珮閫熼〉緙撳瓨涓侭uffer</span><span style="font-family:瀹嬩綋;">鏄互page</span><span style="font-family:瀹嬩綋;">涓哄崟浣嶅嵆4k</span><span style="font-family:瀹嬩綋;">銆備箣鍚庡綋璋冪敤cond_resched()</span><span style="font-family:瀹嬩綋;">榪涜榪涚▼鐨勮皟搴︼紝DMA</span><span style="font-family:瀹嬩綋;">浼?xì)灏哹uffer</span><span style="font-family:瀹嬩綋;">涓殑鍐呭鍐欒繘紜洏銆?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span style="font-family:瀹嬩綋;">鎵浠ュ綋姣忔浠?k</span><span style="font-family:瀹嬩綋;">涓哄崟浣嶅啓鍏ョ‖鐩樻椂鏁堢巼浼?xì)杈惧埌鏈楂樸備笅闈㈡槸UNIX</span><span style="font-family:瀹嬩綋;">鐜楂樼駭緙栫▼鐨勫疄楠岀粨鏋滐細(xì)</span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><img src="http://www.shnenglu.com/images/cppblog_com/range/22.jpg" width="471" height="598" alt="" /><br /></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span style="font-family:瀹嬩綋;">涓嬪浘鏄痩inux </span><span style="font-family:瀹嬩綋;">鐨勫潡璁懼鐨勬暟鎹搷浣滃眰嬈★細(xì)</span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span>Sector</span><span style="font-family:瀹嬩綋;">鎵囧尯錛氭槸璁懼椹卞姩鍜孖O</span><span style="font-family:瀹嬩綋;">璋冨害紼嬪簭澶勭悊鏁版嵁綺掑害銆?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span>Block</span><span style="font-family:瀹嬩綋;">鍧楋細(xì)鏄疺FS</span><span style="font-family:瀹嬩綋;">鍜屾枃浠剁郴緇熷鐞嗘暟鎹殑綺掑害銆傚叾澶у皬涓嶅敮涓錛屽彲浠ユ槸512,1024,2048,4096</span><span style="font-family:瀹嬩綋;">瀛楄妭銆傚唴鏍告搷浣滅殑鍧楀ぇ灝忔槸4096</span><span style="font-family:瀹嬩綋;">瀛楄妭銆?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span>Segment</span><span style="font-family:瀹嬩綋;">孌碉細(xì)鏄疍MA</span><span style="font-family:瀹嬩綋;">浼犻佺殑鍗曚綅銆傛瘡涓涓鍖呭惈浜嗙浉閭?cè)潥勬墖鍖哄Q屽畠鑳戒嬌DMA</span><span style="font-family:瀹嬩綋;">浼犻佷笉鐩擱偦鐨勬墖鍖恒?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><img src="http://www.shnenglu.com/images/cppblog_com/range/23.jpg" width="359" height="353" alt="" /><br /></p> <p> </p> <p style="margin-left:21.0pt;text-indent:-21.0pt;"><span><span>鍥涳紟</span><span style="font-family:瀹嬩綋;">鐢ㄦ埛紼嬪簭</span></span></p> <p style="margin-left:21.0pt"><span style="font-family:瀹嬩綋;">鏍規(guī)嵁浠ヤ笂鐨勫垎鏋愶紝鎴戜滑鐨?span>write buffer</span></span><span style="font-family:瀹嬩綋;">涓鑸緗負(fù)4K</span><span style="font-family:瀹嬩綋;">鐨勫嶆暟銆?/span></p> <p style="margin-left:21.0pt"> </p> <p style="margin-left:21.0pt"><span style="font-family:瀹嬩綋;">鍦ㄧ▼搴忎腑鏈夋剰璇嗙殑寤惰繜鍐欍傝繖涓槸os</span><span style="font-family:瀹嬩綋;">鐨勭瓥鐣ワ紝褰撶劧涔熷彲浠ュ簲鐢ㄥ埌紼嬪簭鐨勮璁′腑銆傚綋鐒朵篃浼?xì)鏈壘~虹偣錛?.</span><span style="font-family:瀹嬩綋;">濡傛灉紜歡閿欒鎴栨帀鐢?shù)锛屽垯浼?xì)涓㈠け鍐呭錛堝仛棰濆鐨勫浠斤級2.</span><span style="font-family:瀹嬩綋;">闇瑕侀澶栫殑鍐呭瓨絀洪棿銆傦紙鐗虹壊鍐呭瓨鏉ユ彁楂業(yè)O</span><span style="font-family:瀹嬩綋;">鐨勬晥鐜囷級</span></p> <p style="margin-left:21.0pt"> </p> <p style="margin-left:21.0pt"><span style="font-family:瀹嬩綋;">鎴戜滑榪橀渶鏍規(guī)嵁緋葷粺鐨処O</span><span style="font-family:瀹嬩綋;">璋冨害鍣ㄧ殑璋冨害絳栫暐錛岃璁″嚭涓嶅悓鐨処O</span><span style="font-family:瀹嬩綋;">絳栫暐銆傚敖閲忛檷浣庣鐩樼殑騫沖潎璁塊棶鏃墮棿錛岄檷浣庤姹傞槦鍒楋紝鎻愰珮鏁版嵁浼犺緭鐨勯熺巼銆?/span></p> <p> </p> <p> </p> <p> </p> <p style="margin-left:21.0pt;text-indent:-21.0pt;"><span><span>浜旓紟</span><span style="font-family:瀹嬩綋;">鐩戞帶紜洏鐨勫伐鍏峰拰鎸囨爣</span></span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span>Iostat–x –k 1</span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span> -x</span><span style="font-family:瀹嬩綋;">鏄劇ず鏇村鐨勬秷鎭?nbsp;-k</span><span style="font-family:瀹嬩綋;">鏁版嵁浠B</span><span style="font-family:瀹嬩綋;">涓哄崟浣?1</span><span style="font-family:瀹嬩綋;">姣忕鏄劇ず涓嬈?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span style="font-family:瀹嬩綋;">杈撳嚭鏄劇ず鐨勪俊鎭?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span>Iowait</span><span style="font-family:瀹嬩綋;">錛歝pu</span><span style="font-family:瀹嬩綋;">絳夊緟鏈畬鎴愮殑IO</span><span style="font-family:瀹嬩綋;">璇鋒眰鑰岀┖闂茬殑鏃墮棿鐨勬瘮渚嬨?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span>Idle</span><span style="font-family:瀹嬩綋;">錛歝pu</span><span style="font-family:瀹嬩綋;">絀洪棽涓旀棤IO</span><span style="font-family:瀹嬩綋;">璇鋒眰鐨勬瘮渚嬨?/span></p> <p style="margin-left:31.5pt; text-indent:-10.5pt;"><span>rrqm/s</span><span style="font-family:瀹嬩綋;">錛氭瘡縐掕繖涓澶囩浉鍏崇殑璇誨彇璇鋒眰鏈夊灝戣Merge</span><span style="font-family:瀹嬩綋;">浜嗐?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span>wrqm/s</span><span style="font-family:瀹嬩綋;">錛氭瘡縐掕繖涓澶囩浉鍏崇殑鍐欏叆璇鋒眰鏈夊灝戣Merge</span><span style="font-family:瀹嬩綋;">浜嗐?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span>rsec/s</span><span style="font-family:瀹嬩綋;">錛氭瘡縐掕鍙栫殑鎵囧尯鏁幫紱</span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span>wsec/</span><span style="font-family:瀹嬩綋;">錛氭瘡縐掑啓鍏ョ殑鎵囧尯鏁般?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span>r/s</span><span style="font-family:瀹嬩綋;">錛氭瘡縐掑畬鎴愮殑璇?I/O </span><span style="font-family:瀹嬩綋;">璁懼嬈℃暟銆傚嵆<span> delta(rio)/s</span></span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span>w/s</span><span style="font-family:瀹嬩綋;">錛氭瘡縐掑畬鎴愮殑鍐?I/O </span><span style="font-family:瀹嬩綋;">璁懼嬈℃暟銆傚嵆<span> delta(wio)/s</span></span></p> <p style="margin-left:31.5pt; text-indent:-10.5pt;"><span>await</span><span style="font-family:瀹嬩綋;">錛氭瘡涓涓狪O</span><span style="font-family:瀹嬩綋;">璇鋒眰鐨勫鐞嗙殑騫沖潎鏃墮棿錛堝崟浣嶆槸姣錛夈傚寘鎷姞鍏ヨ姹傞槦鍒楀拰鏈嶅姟鐨勬椂闂淬?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span>svctm:   </span><span style="font-family:瀹嬩綋;">騫沖潎姣忔璁懼I/O</span><span style="font-family:瀹嬩綋;">鎿嶄綔鐨勬湇鍔℃椂闂淬?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span>avgrq-sz: </span><span style="font-family:瀹嬩綋;">騫沖潎姣忔璁懼I/O</span><span style="font-family:瀹嬩綋;">鎿嶄綔鐨勬暟鎹ぇ灝?(</span><span style="font-family:瀹嬩綋;">鎵囧尯)</span><span style="font-family:瀹嬩綋;">銆傚嵆<span> delta(rsect+wsect)/delta(rio+wio)<br /> avgqu-sz: </span></span><span style="font-family:瀹嬩綋;">騫沖潎I/O</span><span style="font-family:瀹嬩綋;">闃熷垪闀垮害銆傚嵆 delta(aveq)/s/1000 (</span><span style="font-family:瀹嬩綋;">鍥犱負(fù)aveq</span><span><span style="font-family:瀹嬩綋;color:#333333">鐨勫崟浣嶄負(fù)姣</span></span><span><span style="font-family:"Arial","sans-serif";color:#333333">)</span></span><span><span style="font-family:瀹嬩綋;color:#333333">銆?/span></span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span>%util</span><span style="font-family:瀹嬩綋;">錛氬湪緇熻鏃墮棿鍐呮墍鏈夊鐞咺O</span><span style="font-family:瀹嬩綋;">鏃墮棿錛岄櫎浠ユ誨叡緇熻鏃墮棿銆備緥濡傦紝濡傛灉緇熻闂撮殧1</span><span style="font-family:瀹嬩綋;">縐掞紝璇ヨ澶囨湁0.8</span><span style="font-family:瀹嬩綋;">縐掑湪澶勭悊IO</span><span style="font-family:瀹嬩綋;">錛岃?.2</span><span style="font-family:瀹嬩綋;">縐掗棽緗紝閭ｄ箞璇ヨ澶囩殑%util = 0.8/1 = 80%</span><span style="font-family:瀹嬩綋;">錛屾墍浠ヨ鍙傛暟鏆楃ず浜嗚澶囩殑綣佸繖紼嬪害銆備竴鑸湴錛屽鏋滆鍙傛暟鏄?00%</span><span style="font-family:瀹嬩綋;">琛ㄧず璁懼宸茬粡鎺ヨ繎婊¤礋鑽瘋繍琛屼簡錛堝綋鐒跺鏋滄槸澶氱鐩橈紝鍗充嬌%util</span><span style="font-family:瀹嬩綋;">鏄?00%</span><span style="font-family:瀹嬩綋;">錛屽洜涓虹鐩樼殑騫跺彂鑳藉姏錛屾墍浠ョ鐩樹嬌鐢ㄦ湭蹇呭氨鍒頒簡鐡墮錛夈?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"> </p> <p style="margin-left:21.0pt;text-indent:0cm;"><span style="font-family:瀹嬩綋;">涓嬮潰鎴戜滑鍋氫竴涓疄楠屾潵鍒嗘瀽涓涓?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span style="font-family:瀹嬩綋;">鎴戜滑浣跨敤鍛戒護(hù)</span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span><span>time dd if=/dev/zero of=/home/zhouyuan/mytest bs=1M count=3000</span></span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span style="font-family:瀹嬩綋;">鍚憁ytest</span><span style="font-family:瀹嬩綋;">鍐欏叆鏁版嵁錛屽啓鍏?G</span><span style="font-family:瀹嬩綋;">銆?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span style="font-family:瀹嬩綋;">鎴彇閮ㄥ垎鐨勭姸鎬佺洃鎺э細(xì)</span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><img src="http://www.shnenglu.com/images/cppblog_com/range/24.jpg" width="992" height="354" alt="" /><br /></p> <p style="margin-left:21.0pt;text-indent:0cm;"><img src="http://www.shnenglu.com/images/cppblog_com/range/25.jpg" width="692" height="361" alt="" /><br /></p> <p style="margin-left:21.0pt;text-indent:0cm;"><img src="http://www.shnenglu.com/images/cppblog_com/range/26.jpg" width="668" height="357" alt="" /><br /></p> <p style="margin-left:21.0pt;text-indent:0cm;"> </p> <p style="margin-left:21.0pt;text-indent:0cm;"><span style="font-family:瀹嬩綋;">濡傚浘2</span><span style="font-family:瀹嬩綋;">錛屽綋涓ゆ潯鏁版嵁<span> iowait </span></span><span><span style="font-family: 瀹嬩綋;">杈懼埌浜?/span> 99% </span><span style="font-family:瀹嬩綋;">浠ヤ笂錛屽啓鍏ョ殑鏁版嵁鏄?</span><span style="font-family:瀹嬩綋;">錛岃繖鏄洜涓篋MA</span><span style="font-family:瀹嬩綋;">灝嗗唴瀛樼殑涓殑鏁版嵁浼犺緭緇欒澶囥傜粨鍚堝浘1</span><span style="font-family:瀹嬩綋;">鐨勫墠涓ゆ潯鏁版嵁錛屽埄鐢ㄧ巼杈懼埌浜?9%+</span><span style="font-family:瀹嬩綋;">鍗存病鏈夊啓鍏ョ殑紓佺洏鍧椼?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span style="font-family:瀹嬩綋;">濡傚浘3</span><span style="font-family:瀹嬩綋;">錛宨owait</span><span style="font-family:瀹嬩綋;">涓嬮檷錛岃鏄巆pu</span><span style="font-family:瀹嬩綋;">寮濮嬫墽琛岀浉鍏崇▼搴忥紝鑰屾鏃跺潡璁懼寮濮嬪啓鍏ョ殑鏁版嵁銆傝繖涓や釜鎿嶄綔鏄紓姝ヨ繘琛岀殑銆?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"> </p> <p style="margin-left:21.0pt;text-indent:0cm;"><span>Vmstat–k –n 1</span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span>Swap</span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span style="font-family:瀹嬩綋;">銆銆si: </span><span style="font-family:瀹嬩綋;">浠庣鐩樹氦鎹㈠埌鍐呭瓨鐨勪氦鎹㈤〉鏁伴噺錛屽崟浣嶏細(xì)KB/</span><span style="font-family:瀹嬩綋;">縐?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span style="font-family:瀹嬩綋;">銆銆so: </span><span style="font-family:瀹嬩綋;">浠庡唴瀛樹氦鎹㈠埌紓佺洏鐨勪氦鎹㈤〉鏁伴噺錛屽崟浣嶏細(xì)KB/</span><span style="font-family:瀹嬩綋;">縐?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span>IO</span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span style="font-family:瀹嬩綋;">銆銆bi: 浠?/span><span style="font-family:瀹嬩綋;">鍧楄澶囨帴鍙楃殑鍧楁暟錛屽崟浣嶏細(xì)鍧?</span><span style="font-family:瀹嬩綋;">縐?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><span style="font-family:瀹嬩綋;">銆銆bo: </span><span style="font-family:瀹嬩綋;">鍙戦佸埌鍧楄澶囩殑鍧楁暟錛屽崟浣嶏細(xì)鍧?</span><span style="font-family:瀹嬩綋;">縐?/span></p> <p style="margin-left:21.0pt;text-indent:0cm;"><img src="http://www.shnenglu.com/images/cppblog_com/range/27.jpg" width="748" height="31" alt="" /><br /></p> <p style="margin-left:21.0pt;text-indent:0cm;"><img src="http://www.shnenglu.com/images/cppblog_com/range/28.jpg" width="736" height="461" alt="" /><br /></p> <p style="margin-left: 21pt; text-indent: 0cm; "><span style="font-family: 瀹嬩綋; ">浠庡浘涓垜浠彲浠ョ湅鍑虹郴緇熺殑寤惰繜鍐欍?/span></p></div><img src ="http://www.shnenglu.com/range/aggbug/154449.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.shnenglu.com/range/" target="_blank">Range</a> 2011-08-26 20:04 <a href="http://www.shnenglu.com/range/archive/2011/08/26/154449.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>#pragma pack瀛︿範(fàn)http://www.shnenglu.com/range/archive/2011/07/15/151094.htmlRangeRangeFri, 15 Jul 2011 12:36:00 GMThttp://www.shnenglu.com/range/archive/2011/07/15/151094.htmlhttp://www.shnenglu.com/range/comments/151094.htmlhttp://www.shnenglu.com/range/archive/2011/07/15/151094.html#Feedback6http://www.shnenglu.com/range/comments/commentRss/151094.htmlhttp://www.shnenglu.com/range/services/trackbacks/151094.html      鏈榪戣皟璇曠綉緇滅殑鏈嶅姟绔▼搴忥紝鑷繁鍐欎簡涓涓皬瀹㈡埛绔▼搴忔潵嫻嬭瘯錛屽彂鐜版湇鍔＄▼搴忚В鍖呴敊璇傜粡璋冭瘯鍙戠幇瀹㈡埛绔殑鍗忚澶村ぇ灝忓拰鏈嶅姟鍣ㄧ鐨勫崗璁ご澶у皬涓嶄竴鑷淬傚師鍥犳槸鏈嶅姟鍣ㄧ鍔犱簡#pragma pack(1),鑰屽鎴風(fēng)娌″姞銆?/span>

    涔嬪墠娌℃帴瑙﹁繃榪欎釜緙栬瘧瀹忥紝鐜板湪鏉ヨ鐪熷涔?fàn)涔嬨?/span>

    棣栧厛google涔?/span>~~

    鍘熸潵#pragma pack鏈夊嚑縐嶅艦寮忥紝鎴戞墍鎺ヨЕ鍒扮殑鏄?/span>#pragma pack(n)錛屽嵆鍙橀噺浠?/span>n瀛楄妭瀵歸綈銆?/span>

    鍙橀噺瀵歸綈鍦ㄦ瘡涓郴緇熶腑鏄笉涓鏍風(fēng)殑錛岄粯璁ょ殑瀵歸綈鏂瑰紡鑳芥湁鏁堢殑鎻愰珮cpu鍙栨寚鍙栨暟鐨勯熷害錛屼絾鏄彲鑳戒細(xì)嫻垂涓瀹氱殑絀洪棿銆傚湪緗戠粶紼嬪簭涓噰鐢?/span>#pragma pack(1),鍗沖彉閲忕揣緙╋紝涓嶄絾鍙互鍑忓皯緗戠粶嫻侀噺錛岃繕鍙互鍏煎鍚勭緋葷粺錛屼笉浼?xì)鍥犱负绯痪l熷榻愭柟寮忎笉鍚岃屽鑷磋В鍖呴敊璇?/span>

    浜嗚В浜嗘蹇靛拰浼樼偣錛岀幇鍦ㄦ垜浠氨鏉ユ祴璇曚箣~

 

    騫沖彴錛?/span>CPU—Pentium E5700 鍐呭瓨—2G

     1.鎿嶄綔緋葷粺錛?/span>ubuntu 11.04 32bit   緙栬瘧鍣細(xì)G++ 4.5.2

     2.鎿嶄綔緋葷粺錛?/span>windows xp              緙栬瘧鍣細(xì)VS2010

 

    鍏堢湅絎竴涓祴璇曘?/span>

    緇撴瀯浣撳湪姝ｅ父鎯呭喌鍜岀揣緙╂儏鍐靛湪浠ヤ笂涓嶅悓鐜涓嬪崰鐢ㄧ殑鍐呭瓨澶у皬銆?/span>

1 struct pack {
2   int i;
3   short s;
4   double d;
5   char c;
6   short f;
7 }

  
   嫻嬭瘯緇撴灉涓猴細(xì)

    1錛?br />   

 

    2錛?br />    
  
    嫻嬭瘯緇撴灉鍒嗘瀽錛?/span>

 

 

    鍙互鐪嬪嚭绱х緝鍚庣粨鏋勪綋鐨勫ぇ灝忎負(fù)15錛屾槸緇撴瀯浣撳唴緗被鍨嬪ぇ灝忕殑鍜屻備絾鏄湪榛樿鎯呭喌涓嬶紝緇撴瀯浣撶殑澶у皬閮芥槸瀵歸綈瀛楄妭鏁扮殑鍊嶆暟銆?/span>ubuntu涓?/span>pack鍙渶瑕?/span>20涓瓧鑺傦紝鑰?/span>windows瑕?/span>24涓瓧鑺傘傝繖鏄洜涓?/span>ubuntu鏄互4瀛楄妭瀵歸綈錛岃?/span>windows鍒欐槸浠ユ渶澶х殑鍐呯疆綾誨瀷鐨勫瓧鑺傛暟瀵歸綈錛屽湪緇撴瀯浣撳唴鏈澶х殑鍐呯疆綾誨瀷涓?/span>double錛屽叾澶у皬涓?/span>8涓瓧鑺傘備粬浠湪鍐呭瓨涓殑瀵歸綈鏂瑰紡濡備笅鍥撅細(xì)

    1錛?/span>

    

    2錛?/span>

    

   榪橀渶娉ㄦ剰鐨勬槸錛?/span>鍦ㄥ榻愮被鍨嬬殑鍐呴儴閮芥槸浠?/span>2瀛楄妭瀵歸綈鐨勩?/span>

   緇撹錛?/span>鍦ㄩ粯璁ゆ儏鍐典笅錛?/span>linux鎿嶄綔緋葷粺鏄互4瀛楄妭瀵歸綈錛?/span>windows鎿嶄綔緋葷粺鍒欐槸浠ユ渶澶х殑鍐呯疆綾誨瀷瀵歸綈銆?/span>

 

   絎簩涓祴璇?/span>

   涓涓粨鏋勪綋鍐呭寘鍚彟澶栦竴涓粨鏋勪綋錛屽叾澶у皬鐨勬儏鍐點(diǎn)?/span>

   鍐呴儴鐨勭粨鏋勪綋涓?/span>

1 struct pack {
2   short s;
3   double d;
4 }

   澶栭儴鐨勭粨鏋勪綋涓?/span>

   1 struct complex _pack{

2   char c;
3   struct pack s;
4   double d;
5 };

    鎴戜滑鏈夊洓縐嶆儏鍐碉細(xì)

     1.      pack绱х緝錛?/span>complex _pack绱х緝

     2.      pack绱х緝錛?/span>complex _pack榛樿

     3.      pack榛樿錛?/span>complex _pack绱х緝

     4.      pack榛樿錛?/span>complex _pack榛樿

    浠ヤ笅鐨勬帓鍒楀潎鎸夋欏哄簭銆?/span>

     嫻嬭瘯鐨勭粨鏋?/span>

      1錛?/span>

      

     2錛?/span>

      

    嫻嬭瘯緇撴灉鍒嗘瀽錛?/span>

    鍦ㄤ袱涓搷浣滅郴緇熶笅錛岄櫎浜嗙涓縐嶆儏鍐?/span>----鍐呯粨鏋勪綋鍜屽緇撴瀯浣撻兘绱х緝----鐩稿悓涔嬪錛屽叾浠栦笁縐嶆儏鍐甸兘涓嶇浉鍚屻傛垜浠彲浠ユ牴鎹亸縐葷敾鍑虹粨鏋勪綋鍦ㄥ唴瀛樹腑鐨勬儏鍐點(diǎn)傜涓縐嶆儏鍐電渷鐣ャ?/span>

     1錛?/span>

     

     2錛?/span>

     

    緇撹錛?/span>#pragma pack鍙獎(jiǎng)鍝嶅綋鍓嶇粨鏋勪綋鐨勫彉閲忕殑瀵歸綈鎯呭喌錛屽茍涓嶄細(xì)褰卞搷緇撴瀯浣撳唴閮ㄧ殑緇撴瀯浣撳彉閲忕殑鎺掑垪鎯呭喌銆傛垨鑰呰#pragma pack鐨勪綔鐢ㄥ煙鍙槸涓灞?/span>銆傛垜浠敱絎笁縐嶆儏鍐碉紝鍐呴儴緇撴瀯浣撴甯革紝澶栭儴緇撴瀯浣撶揣緙╋紝鍙互寰楀嚭緇撴瀯浣撶殑瀵歸綈鏄寜鍋忕Щ璁＄畻鐨勩?/span>

    榪欓噷榪樻湁涓涓棶棰樻病瑙ｅ喅錛屼負(fù)浠涔堢浜岀鎯呭喌鍐呴儴緇撴瀯浣撶殑鍋忕Щ閮芥槸1?涓嶆槸4鎴栬?錛?/p>

 



Range 2011-07-15 20:36 鍙戣〃璇勮
]]>NAT瀛︿範(fàn)http://www.shnenglu.com/range/archive/2011/07/15/151093.htmlRangeRangeFri, 15 Jul 2011 12:35:00 GMThttp://www.shnenglu.com/range/archive/2011/07/15/151093.htmlhttp://www.shnenglu.com/range/comments/151093.htmlhttp://www.shnenglu.com/range/archive/2011/07/15/151093.html#Feedback2http://www.shnenglu.com/range/comments/commentRss/151093.htmlhttp://www.shnenglu.com/range/services/trackbacks/151093.html      The IP Network Address Translator錛?/span>IP緗戠粶鍦板潃杞崲鏄漢浠鐨?/span>NAT錛屾垨鑰呰NA(P)T銆?/span>NAT鏄負(fù)浜嗚В鍐?/span>IPv4鍦板潃涓嶈凍鑰屾彁鍑烘潵寰椾竴縐嶆浛浠ｆ柟妗堬紝鍙互瀵瑰鐣屽睆钄藉唴閮ㄧ殑緗戠粶鎷撴墤銆傞殢鐫緗戠粶鐨勫彂灞曪紝NAT闃葷浜嗘瀯寤哄湪瑕嗙洊緗戠粶鐨?/span>P2P紼嬪簭鐨勫彂灞曘傚洜涓鴻鐩栫綉緇滄槸鏋勫緩鍦ㄥ簲鐢ㄥ眰錛屽睆钄戒簡浼犺緭灞備互涓嬬殑緗戠粶鎷撴墤錛岀綉緇滀腑鐨勬瘡涓涓妭鐐規(guī)垨鏌愪簺鑺傜偣鏈夋緗戠粶鐨勮礬鐢辮〃錛岀敱榪欎簺璺敱琛ㄦ瀯寤哄嚭榪欎釜瑕嗙洊緗戠粶錛屼絾鏄?/span>NAT闃葷鐨勮鐩栫綉緇滀腑鑺傜偣鐨勮繛鎺ャ?br />    
    
   
    涓婂浘鏄劇ず浜?/span>NAT鐨勫師鐞嗐?/span>NAT灝嗗唴緗戠殑IP鏇挎崲涓哄叕緗?/span>IP錛屽皢绔彛鏄犲皠涓哄叕緗戠殑绔彛銆傚叕緗?/span>IP鏇挎崲鍐呯綉IP鏄浐瀹氱殑錛?/span>NAT鐨勪笉瓚充箣澶勫湪浜庣鍙ｇ殑鏇挎崲銆傚洜涓?/span>NAT榪樻病鏈夊艦鎴愭爣鍑嗭紝鏇挎崲絳栫暐鏈夊嚑縐嶏紝榪欎篃鏄?/span>NAT琛屼負(fù)鐨勫叧閿?/span>

     鍦ㄣ?/span>Behavior and Classification of NAT Devices and Implications for NAT Traversal銆嬩竴鏂囦腑灝辨妸绔彛鏄犲皠鐨勮涓哄垎鎴愬洓縐嶏紝鍏朵腑鍖呮嫭淇濈暀绔彛錛屼笉淇濈暀绔彛錛岀鍙ｉ噸杞斤紝绔彛澶嶇敤銆傝繖鍥涚鍒嗙被鏈緇堝尯鍒嗕簡NAT鐨勫洓縐嶇被鍨嬪嵆Full cone NAT錛?/span>Symmetric NAT錛?/span>Port-Restrictes cone NAT 錛?/span>Address-Restriced cone NAT銆?/span>

     涓轟簡浣胯鐩栫綉緇滀腑鐨勮妭鐐圭浉浜掗氫俊錛屾垜浠渶瑕佽繘琛?/span>NAT絀胯秺銆傚湪銆?/span>A NAT Traversal Mechanism for Peer-To-Peer Networks銆嬩竴鏂囩浠嬬粛浜嗘牴鎹袱绔笉鍚岀殑NAT綾誨瀷瀵瑰簲鐨勫洓縐?/span>NAT絀胯秺鏂規(guī)銆傚涓嬪浘
     
     

    榪欎簺瑙ｅ喅鏂規(guī)閮介渶瑕?/span>STUN錛?/span>Simple Traversal of User Datagram Protocol through Network Address Translators (NATs)錛?/span>NAT鐨?/span>UDP綆鍗曠┛瓚婏級鍗忚甯姪銆係TUN鍗忚瑕佹眰涓鍙板叿鏈夊叕緗?/span>IP鐨勪富鏈哄府鍔╀竴鍙頒富鏈鴻繘琛?/span>NAT綾誨瀷鐨勫垽鏂?br />    

      涓婂浘鏄?/span>STUN鍗忚鐨勬祦紼嬶紝鍏朵富瑕佺殑鎬濇兂鏄氳繃STUN鐨勫洖灝勬潵鍒ゆ柇涓繪満鐨?/span>NAT綾誨瀷銆?/span>

     闄や簡鐩存帴榪炴帴錛屽弽鍚戣繛鎺ャ佹墦媧炲拰渚濊禆閮介渶瑕佺涓夊彴涓繪満鐨勫府鍔┿?/span>

     鍦ㄣ?/span>Characterization and Measurement of TCP Traversal through NATs and Firewalls銆嬩竴鏂囦腑浠嬬粛浜?/span>TCP絀胯秺鐨勬柟娉曘傚湪STUNT#2鏂規(guī)硶涓紝絎笁鍙頒富鏈哄拰涓ゅ彴闇瑕佽繛鎺ョ殑涓繪満閮芥湁闀胯繛鎺ワ紝褰撲竴鏂歸渶瑕佸彂璧鋒潵榪炴帴鏃訛紝鍚戠涓夊彴涓繪満鍙戣姹傦紝絎笁鍙頒富鏈哄悜琚姹傜殑涓繪満鍙戦侀個(gè)璇鳳紝姝ゆ椂闇瑕佽繛鎺ョ殑涓繪満閮藉悜瀵規(guī)柟鍙戦?/span>SYN鍖咃紝姝ゆ椂鍙屾柟鐨勯槻鐏閮芥湁浜嗘礊錛屽彧瑕佹湁涓鏂圭殑SYN鍖呭埌杈懼鏂逛富鏈猴紝榪炴帴灝變細(xì)琚緩绔嬨?/span>Relay鏂規(guī)硶闇瑕佽楄垂鐨勪唬浠峰お澶э紝鍦?/span>P2P搴旂敤涓竴鑸細(xì)娑堟瀬鐨勫鐞嗗弻鏂歸兘鏄縐?/span>NAT鐨勬儏鍐點(diǎn)?/span>






 



Range 2011-07-15 20:35 鍙戣〃璇勮
]]>Initializationhttp://www.shnenglu.com/range/archive/2011/07/15/151092.htmlRangeRangeFri, 15 Jul 2011 12:31:00 GMThttp://www.shnenglu.com/range/archive/2011/07/15/151092.htmlhttp://www.shnenglu.com/range/comments/151092.htmlhttp://www.shnenglu.com/range/archive/2011/07/15/151092.html#Feedback0http://www.shnenglu.com/range/comments/commentRss/151092.htmlhttp://www.shnenglu.com/range/services/trackbacks/151092.htmlHello World錛?/span>

Range 2011-07-15 20:31 鍙戣〃璇勮
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