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Hugepage
PHP7¸Õ¸Õ*¢²¼ÁËRC4, °uº¬Ò»Ð(C)bugÐÞ¸´ºÍÒ»¸oÎÒÃÇ×iеÄÐÔÄÜÌaÉý³É¹u£¬ ÄǾÍÊÇ¡±HugePageFy PHP TEXT segment¡±£¬ ͨ¹ýÆoÓÃÕa¸oÌØÐÔ£¬PHP7»a°Ñ×ÔÉiµÄTEXT¶Î£¨Ö´ÐÐÌa£(C)¡±Å²¡°µ½HuagepageÉÏ£¬Ö®Ç°µÄ²aÊÔ£¬ÎÒÃÇÄÜÎȶ¨µÄÔÚWordpressÉÏ¿´µ½2%~3%µÄQPSÌaÉý¡£

¹ØÓÚHugepageÊÇɶ£¬¼oµ¥µÄ˵ϾÍÊÇĬÈϵÄÄÚ´aeÊÇÒÔ4KBÖÒ³µÄ£¬¶øÐeÄaµØÖºÍÄÚ´aeµØÖ*ÊÇÐeҪת»»µÄ£¬ ¶øÕa¸oת»»ÊÇÒª²e±iµÄ£¬CPUΪÁ˼ÓËÙÕa¸o²e±i¹ý³Ì¶¼»aÄÚ½¨TLB£¨Translation Lookaside Buffer£(C)£¬ ÏÔ¶øÒ×¼uÈç¹uÐeÄaҳԽС£¬±iÀiµÄÌoÄ¿ÊýÒ²¾ÍÔ½¶a£¬¶øTLB´oСÊÇÓÐÏ޵ģ¬ÌoÄ¿ÊýÔ½¶aTLBµÄCache MissÒ²¾Í»aÔ½¸ß£¬ ËuÒÔÈç¹uÎÒÃÇÄÜÆoÓôoÄÚ´aeÒ³¾ÍÄܼa½Ó½µµÍÕa¸oTLB Cache Miss£¬ÖÁÓÚÏeϸµÄ½eÉÜ£¬GoogleÒ»ËÑÒ»´o¶ÑÎҾͲ»×¸ÊoÁË£¬ÕaÀiÖ÷Ҫ˵Ã÷ÏÂÈçºÎÆoÓÃÕa¸oÐÂÌØÐÔ£¬ ´Ó¶ø´øÀ´Ã÷ÏÔµÄÐÔÄÜÌaÉý¡£

еÄKernelÆoÓÃHugepageÒѾ­±aµÃdz£ÈÝÒ×ÁË£¬ÒÔÎҵĿª¢ÐeÄa»uΪÀý(Ubuntu Server 14.04£¬Kernel 3.13.0-45), Èç¹uÎÒÃDze¿´ÄÚ´aeÐÅÏ¢£º

    $ cat /proc/meminfo | grep Huge

    AnonHugePages:  444416 kB
    HugePages_Total:    0
    HugePages_Free:    0
    HugePages_Rsvd:    0
    HugePages_Surp:    0
    Hugepagesize:    2048 kB

¿É¼uÒ»¸oHugepageµÄsizeÊÇ2MB, ¶øµ±Ç°²¢Ã»ÓÐÆoÓÃHugePages. ÏÖÔÚÈÃÎÒÃÇÏȱaÒePHP RC4, ¼ÇµÃÒ»¶¨²»Òª¼Ó£º ¨Cdisable-huge-code-pages £¨Õa¸oÐÂÌØÐÔÊÇĬÈÏÆoÓõģ¬ Äa¼ÓÁËÕa¸o¾Í¹ØÁË£(C)

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    zend_extension=opcache.so

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    opcache.huge_code_pages=1

ÏÖÔÚÈÃÎÒÃÇÅaÖÃOS£¬ *ÖÅaÒ»Ð(C)Hugepages£º

    $ sudo sysctl vm.nr_hugepages=128
    vm.nr_hugepages = 128

ÏÖÔÚÈÃÎÒÃÇÔٴμi²eÄÚ´aeÐÅÏ¢:

    $ cat /proc/meminfo | grep Huge

    AnonHugePages:  444416 kB
    HugePages_Total:   128
    HugePages_Free:   128
    HugePages_Rsvd:    0
    HugePages_Surp:    0
    Hugepagesize:    2048 kB

¿ÉÒÔ¿´µ½ÎÒÃÇ*ÖÅaµÄ128¸oHugepagesÒѾ­¾ÍÐ÷ÁË£¬ È»ºoÎÒÃÇÀ´Æo¶¯php-fpm:

    $ /home/huixinchen/local/php7/sbin/php-fpm

    [01-Oct-2015 09:33:27] NOTICE: [pool www] 'user' directive is ignored when FPM is not running as root
    [01-Oct-2015 09:33:27] NOTICE: [pool www] 'group' directive is ignored when FPM is not running as root

ÏÖÔÚ£¬ Ôٴμi²eÄÚ´aeÐÅÏ¢:

    $ cat /proc/meminfo | grep Huge

    AnonHugePages:  411648 kB
    HugePages_Total:   128
    HugePages_Free:   113
    HugePages_Rsvd:    27
    HugePages_Surp:    0
    Hugepagesize:    2048 kB

˵µ½ÕaÀi£¬Èç¹uHugepages¿ÉÓ㬠ÆaʵOpcacheÒ²»aÓÃHugepagesÀ´´ae´¢opcodes»º´ae£¬ ËuÒÔΪÁËÑeÖ¤opcache.huge_code_pagesÈʵÉuЧ£¬ ÎÒÃDz»Á¹Ø±Õopcache.huge_code_pages, È»ºoÔÙÆo¶¯Ò»´Îºo¿´ÄÚ´aeÐÅÏ¢£º

    $ cat /proc/meminfo | grep Huge

    AnonHugePages:  436224 kB
    HugePages_Total:   128
    HugePages_Free:   117
    HugePages_Rsvd:    27
    HugePages_Surp:    0
    Hugepagesize:    2048 kB

¿É¼u¿ªÆoÁËhuge_code_pagesÒÔºo£¬ fpmÆo¶¯ºo¶aÓÃÁË4¸opages, ÏÖÔÚÎÒÃǼi²eÏÂphp-fpmµÄtext´oС£º

    $ size /home/huixinchen/local/php7/sbin/php-fpm

      text    data     bss     dec     hex   filename
    10114565   695200   131528   10941293   a6f36d   /home/huixinchen/local/php7/sbin/php-fpm

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ÎÒÃÇÒÔÎҵĻuÆ÷ΪÀý:

   Intel(R) Xeon(R) CPU           X5687  @ 3.60GHz X 16(³¬Ïß³Ì),  
   48G Memory  

php-fpm ²ÉÓù̶¨32¸oworker, opcache²ÉÓÃĬÈϵÄÅaÖÃ(Ò»¶¨Òª¼ÇµÃ¼ÓÔØopcache)

ÒÔwordpress 4.1ΪÓÅ»¯³¡¾°..

Ê×ÏÈÎÒÃÇÀ´²aÊÔÏÂÄ¿Ç°WPÔÚPHP7µÄÐÔÄÜ(ab -n 10000 -c 100):

    $ ab -n 10000 -c 100 http://inf-dev-maybach.weibo.com:8000/wordpress/

    This is ApacheBench, Version 2.3 <$Revision: 655654 $>
    Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
    Licensed to The Apache Software Foundation, http://www.apache.org/

    Benchmarking inf-dev-maybach.weibo.com (be patient)
    Completed 1000 requests
    Completed 2000 requests
    Completed 3000 requests
    Completed 4000 requests
    Completed 5000 requests
    Completed 6000 requests
    Completed 7000 requests
    Completed 8000 requests
    Completed 9000 requests
    Completed 10000 requests
    Finished 10000 requests

    Server Software:    nginx/1.7.12
    Server Hostname:    inf-dev-maybach.weibo.com
    Server Port:      8000

    Document Path:     /wordpress/
    Document Length:    9048 bytes

    Concurrency Level:   100
    Time taken for tests:  8.957 seconds
    Complete requests:   10000
    Failed requests:    0
    Write errors:      0
    Total transferred:   92860000 bytes
    HTML transferred:    90480000 bytes
    Requests per second:  1116.48 [#/sec] (mean)
    Time per request:    89.567 [ms] (mean)
    Time per request:    0.896 [ms] (mean, across all concurrent requests)
    Transfer rate:     10124.65 [Kbytes/sec] received

¿É¼uWordpress 4.1 Ä¿Ç°ÔÚÕa¸o»uÆ÷ÉÏ, Ê×Ò³µÄQPS¿ÉÒÔµ½1116.48. Ò²¾ÍÊÇÿÃeÖÓ¿ÉÒÔ´¦ÀiÕaô¶a¸o¶ÔÊ×Ò³µÄÇeÇo,

ÏÖÔÚ, ÈÃÎÒÃÇ¿ªÊ¼½ÌGCC, ÈÃËu±aÒe³oÅÜWordpress4.1¸u¿iµÄPHP7À´, Ê×ÏÈÒªÇoGCC 4.0ÒÔÉϵİae±¾, ²»¹ýÎÒ½¨Òe´o¼ÒʹÓÃGCC-4.8ÒÔÉϵİae±¾(ÏÖÔÚ¶¼GCC-5.1ÁË).

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    $ make prof-gen

×¢Òa, ÎÒÃÇÓõ½ÁËprof-gen²ÎÊý(Õa¸oÊÇPHP7µÄMakefileÌØÓеÄ, ²»Òª³¢ÊÔÔÚÆaËuÏiÄ¿ÉÏÒ²Õaô¸a¹þ :) )

È»ºo, ÈÃÎÒÃÇ¿ªÊ¼ÑµÁ*GCC:

    $ sapi/cgi/php-cgi -T 100 /home/huixinchen/local/www/htdocs/wordpress/index.php >/dev/null

Ò²¾ÍÊÇÈÃphp-cgiÅÜ100±ewordpressµÄÊ×Ò³, ´Ó¶øÉu³ÉÒ»Ð(C)ÔÚÕa¸o¹ý³ÌÖеÄprofileÐÅÏ¢.

È»ºo, ÎÒÃÇ¿ªÊ¼µÚ¶þ´Î±aÒePHP7.

    $ make prof-clean
    $ make prof-use && make install

ºÃµÄ, ¾ÍÕaô¼oµ¥, PGO±aÒeÍe³ÉÁË, ÏÖÔÚÎÒÃÇ¿´¿´PGO±aÒeÒÔºoµÄPHP7µÄÐÔÄÜ:

    $ ab -n10000 -c 100 http://inf-dev-maybach.weibo.com:8000/wordpress/

    This is ApacheBench, Version 2.3 <$Revision: 655654 $>
    Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
    Licensed to The Apache Software Foundation, http://www.apache.org/

    Benchmarking inf-dev-maybach.weibo.com (be patient)
    Completed 1000 requests
    Completed 2000 requests
    Completed 3000 requests
    Completed 4000 requests
    Completed 5000 requests
    Completed 6000 requests
    Completed 7000 requests
    Completed 8000 requests
    Completed 9000 requests
    Completed 10000 requests
    Finished 10000 requests

    Server Software:    nginx/1.7.12
    Server Hostname:    inf-dev-maybach.weibo.com
    Server Port:      8000

    Document Path:     /wordpress/
    Document Length:    9048 bytes

    Concurrency Level:   100
    Time taken for tests:  8.391 seconds
    Complete requests:   10000
    Failed requests:    0
    Write errors:      0
    Total transferred:   92860000 bytes
    HTML transferred:    90480000 bytes
    Requests per second:  1191.78 [#/sec] (mean)
    Time per request:    83.908 [ms] (mean)
    Time per request:    0.839 [ms] (mean, across all concurrent requests)
    Transfer rate:     10807.45 [Kbytes/sec] received

ÏÖÔÚÿÃeÖÓ¿ÉÒÔ´¦Ài1191.78¸oQPSÁË, ÌaÉýÊÇ~7%. »¹²»Àµ¹þ(ß×, Äa²»ÊÇ˵10%ô? Ôoô³É7%ÁË? ºÇºÇ, ÕýÈçÎÒ֮ǰ˵¹ý, ÎÒÃdz¢ÊÔ*ÖÎoPGO¶¼×oÁËÐ(C)ʲôÓÅ»¯, È»ºo°ÑÒ»Ð(C)ͨÓõÄÓÅ»¯ÊÖ¹¤Applyµ½PHP7ÖÐ. ËuÒÔÒ²¾ÍÊÇ˵, ÄÇ~3%µÄ±È½ÏͨÓõÄÓÅ»¯ÒѾ­°uº¬µ½ÁËPHP7ÀiÃaeÁË, µ±È»Õa¸o¹¤×÷»¹ÔÚ¼ÌÐø).

ÓÚÊǾÍÕaô¼oµ¥, ´o¼Ò¿ÉÒÔÓÃ×Ô¼ºµÄ²uƵľ­µa³¡¾°À´ÑµÁGCC, ¼oµ¥¼¸²½, »ñµÃÌaÉý, ºÎÀÖ¶ø²»ÎªÄØ