Re: curl-loader https: low performance due to DNS query?
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Re: curl-loader https: low performance due to DNS query?
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From: Robert I. <cor...@gm...> - 2012-03-05 16:57:54
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If so, please try to change loader.c, line 578 which looks like: curl_easy_setopt (handle, CURLOPT_DNS_CACHE_TIMEOUT, -1); 1. instead of -1 try to set some value like 60 2. make clean; make Thanks, Robert On Mon, Mar 5, 2012 at 6:19 PM, Fred Huang <di...@gm...> wrote: > > Looks like the bottleneck comes from libcurl other than c-ares... > test 3 (no ares patch applied): > dns server: dnsmasq@127.0.0.1, 2,000,000 dns entry cache, resolve *.com to one IP address > number of domain names in URLs: 780,000 > number of client: 1000 > CPU usage: 85% > cpu% irq% sirq% sys% iowt% mem_used buf&cached > 85.6 0.0 0.8 5.9 0.0 3334.3Mb 112.0Mb > SSL TPS: 320 > SSL throughput: 200Mbps > > # gprof /usr/bin/curl-loader gmon.out -p | head -50 > Flat profile: > Each sample counts as 0.01 seconds. > % cumulative self self total > time seconds seconds calls s/call s/call name > 40.80 120.16 120.16 116079 0.00 0.00 Curl_hash_clean_with_criterium > 24.46 192.18 72.02 983166323 0.00 0.00 hostcache_timestamp_remove > 13.30 231.35 39.17 2059341 0.00 0.00 Curl_hash_pick > 6.45 250.35 19.00 240087 0.00 0.00 Curl_hash_add > 4.81 264.51 14.16 334257102 0.00 0.00 Curl_str_key_compare > 3.40 274.52 10.01 119514 0.00 0.00 create_conn > 0.93 277.25 2.73 4478910 0.00 0.00 dprintf_formatf > 0.90 279.91 2.66 122209 0.00 0.00 ConnectionStore > 0.40 281.09 1.18 locking_function > 0.27 281.88 0.79 114759 0.00 0.00 curl_multi_remove_handle > 0.21 282.51 0.63 7993664 0.00 0.00 client_tracing_function > 0.21 283.12 0.61 122685 0.00 0.00 Curl_num_addresses > 0.19 283.68 0.56 397028 0.00 0.00 curl_multi_socket_action > 0.19 284.23 0.55 2036116 0.00 0.00 multi_runsingle > 0.17 284.72 0.49 703687 0.00 0.00 Curl_readwrite > 0.16 285.19 0.47 id_function > 0.15 285.62 0.43 29692029 0.00 0.00 Curl_socket_check > 0.14 286.02 0.40 91973856 0.00 0.00 Curl_raw_toupper > 0.13 286.40 0.38 164664144 0.00 0.00 addbyter > 0.13 286.77 0.37 2180797 0.00 0.00 Curl_infof > 0.11 287.10 0.33 122675 0.00 0.00 Curl_if_is_interface_name > 0.10 287.39 0.29 471318 0.00 0.00 ossl_connect_common > 0.10 287.67 0.28 2113528 0.00 0.00 Curl_raw_equal > 0.09 287.93 0.26 8676 0.00 0.02 curl_multi_socket_all > 0.08 288.17 0.24 1663262 0.00 0.00 Curl_splay > 0.08 288.41 0.24 8505 0.00 0.01 curl_multi_perform > 0.07 288.63 0.22 3114576 0.00 0.00 Curl_pgrsUpdate > 0.06 288.80 0.17 119637 0.00 0.00 singleipconnect > 0.06 288.97 0.17 7994818 0.00 0.00 Curl_debug > 0.05 289.13 0.16 235820 0.00 0.00 event_del > 0.05 289.29 0.16 119393071 0.00 0.00 curl_strequal > 0.05 289.45 0.16 18535473 0.00 0.00 alloc_addbyter > 0.05 289.61 0.16 356074 0.00 0.00 Curl_hash_str > 0.05 289.76 0.15 1797233 0.00 0.00 fd_key_compare > 0.05 289.91 0.15 234966 0.00 0.00 Curl_ssl_getsessionid > 0.04 290.04 0.13 585853 0.00 0.00 Curl_llist_destroy > 0.04 290.16 0.12 240826 0.00 0.00 Curl_resolv > 0.03 290.26 0.10 7514328 0.00 0.00 Curl_raw_nequal > 0.03 290.36 0.10 2214436 0.00 0.00 Curl_read > 0.03 290.46 0.10 116872 0.00 0.00 Curl_http_readwrite_headers > 0.03 290.56 0.10 ssl_tls_trace > 0.03 290.66 0.10 8013097 0.00 0.00 scan_response > 0.03 290.75 0.09 29488555 0.00 0.00 curlx_tvdiff > 0.03 290.84 0.09 2142468 0.00 0.00 Curl_setopt > 0.03 290.93 0.09 476299 0.00 0.00 Curl_expire > > > > > > > > > 2012/3/5 Robert Iakobashvili <cor...@gm...> >> >> Dear Fred Huang, >> >> Thanks for your posting. >> >> Could you please check if this is due to some badness at cares? >> Thanks. >> >> Let's exclude usage of cares based DNS resolving by applying the patch attached >> and use instead global DNS cache. >> >> cd ./curl-loader-0.56 >> patch -p1 < path-to/disable-cares-use-global-dns.patch >> make cleanall; make >> >> See if it helps. >> >> Global cache, unfortunately, is not thread safe. >> >> If it helps, we'll try to restore the previous version of cares. >> >> Thanks, >> Robert >> >> On Mon, Mar 5, 2012 at 4:28 PM, Fred Huang <di...@gm...> wrote: >>> >>> test 1: >>> >>> dns server: dnsmasq@127.0.0.1, 2,000,000 dns entry cache, resolve *.com to one IP address >>> number of domain names in all https URLs: 780,000 >>> number of client: 1000 >>> CPU usage: 78% >>> cpu% irq% sirq% sys% iowt% mem_used buf&cached >>> 78.8 0.0 0.6 3.8 0.0 3640.9Mb 282.1Mb >>> SSL TPS: 300 >>> SSL throughput: 200Mbps >>> >>> # gprof /usr/bin/curl-loader gmon.out -p | head -50 >>> Flat profile: >>> Each sample counts as 0.01 seconds. >>> % cumulative self self total >>> time seconds seconds calls s/call s/call name >>> 38.55 127.10 127.10 130975 0.00 0.00 Curl_hash_clean_with_criterium >>> 24.63 208.32 81.22 1247528407 0.00 0.00 hostcache_timestamp_remove >>> 13.08 251.44 43.12 2791988 0.00 0.00 Curl_hash_pick >>> 7.30 275.51 24.07 352490 0.00 0.00 Curl_hash_add >>> 6.01 295.31 19.80 410760770 0.00 0.00 Curl_str_key_compare >>> 2.95 305.04 9.73 131015 0.00 0.00 create_conn >>> 0.88 307.94 2.90 4841390 0.00 0.00 dprintf_formatf >>> 0.74 310.38 2.44 136036 0.00 0.00 ConnectionStore >>> 0.48 311.96 1.58 814604911 0.00 0.00 ares__is_list_empty >>> 0.36 313.16 1.20 locking_function >>> 0.27 314.06 0.90 261608 0.00 0.00 ares_cancel >>> 0.22 314.79 0.73 127417 0.00 0.00 curl_multi_remove_handle >>> 0.19 315.40 0.62 8906301 0.00 0.00 client_tracing_function >>> 0.17 315.97 0.57 135305 0.00 0.00 Curl_num_addresses >>> 0.17 316.54 0.57 181937907 0.00 0.00 addbyter >>> 0.17 317.09 0.55 2374363 0.00 0.00 multi_runsingle >>> 0.16 317.62 0.53 541954 0.00 0.00 ares__init_list_node >>> 0.16 318.14 0.52 494412 0.00 0.00 curl_multi_socket_action >>> 0.14 318.60 0.46 33578897 0.00 0.00 Curl_socket_check >>> 0.13 319.04 0.44 102951052 0.00 0.00 Curl_raw_toupper >>> 0.13 319.48 0.44 787558 0.00 0.00 Curl_readwrite >>> 0.13 319.91 0.44 id_function >>> 0.12 320.29 0.38 391390 0.00 0.00 Curl_hash_str >>> 0.09 320.58 0.29 9216 0.00 0.00 curl_multi_perform >>> 0.08 320.86 0.28 2350908 0.00 0.00 Curl_raw_equal >>> 0.08 321.14 0.28 2019415 0.00 0.00 Curl_splay >>> 0.08 321.40 0.26 520625 0.00 0.00 ossl_connect_common >>> 0.08 321.65 0.25 3532992 0.00 0.00 Curl_pgrsUpdate >>> 0.07 321.87 0.22 131778537 0.00 0.00 curl_strequal >>> 0.05 322.05 0.18 8954118 0.00 0.00 scan_response >>> 0.05 322.23 0.18 533644 0.00 0.00 ares_expand_name >>> 0.05 322.40 0.17 2477345 0.00 0.00 fd_key_compare >>> 0.05 322.57 0.17 2429135 0.00 0.00 Curl_infof >>> 0.05 322.74 0.17 130966 0.00 0.00 singleipconnect >>> 0.05 322.90 0.16 9292 0.00 0.00 curl_multi_socket_all >>> 0.05 323.06 0.16 270137 0.00 0.00 ares__get_hostent >>> 0.05 323.21 0.15 8943657 0.00 0.00 Curl_debug >>> 0.04 323.35 0.14 262493 0.00 0.00 Curl_ssl_getsessionid >>> 0.04 323.48 0.13 566006 0.00 0.00 socket_callback >>> 0.04 323.61 0.13 33983864 0.00 0.00 curlx_tvdiff >>> 0.04 323.74 0.13 132853 0.00 0.00 Curl_http_readwrite_headers >>> 0.04 323.86 0.12 344032 0.00 0.00 epoll_del >>> 0.04 323.98 0.12 223477 0.00 0.00 Curl_poll >>> 0.04 324.10 0.12 8526280 0.00 0.00 Curl_raw_nequal >>> 0.03 324.21 0.11 348839 0.00 0.00 event_del >>> >>> >>> >>> >>> test 2: >>> >>> dns server: dnsmasq@127.0.0.1, 2,000,000 dns entry cache, resolve *.com to one IP address >>> number of domain names in all https URLs: 1 >>> number of client: 1000 >>> CPU usage: 75% >>> SSL TPS: 1300 >>> SSL throughput: 700Mbps >>> >>> # gprof /usr/bin/curl-loader gmon.out -p | head -50 >>> Flat profile: >>> Each sample counts as 0.01 seconds. >>> % cumulative self self total >>> time seconds seconds calls s/call s/call name >>> 8.98 2.45 2.45 5127312 0.00 0.00 dprintf_formatf >>> 8.90 4.88 2.43 1292796503 0.00 0.00 ares__is_list_empty >>> 6.12 6.55 1.67 322461 0.00 0.00 create_conn >>> 4.58 7.80 1.25 419872 0.00 0.00 ares_cancel >>> 4.10 8.92 1.12 2100162 0.00 0.00 Curl_readwrite >>> 3.92 9.99 1.07 4527388 0.00 0.00 Curl_hash_pick >>> 3.43 10.93 0.94 locking_function >>> 3.04 11.76 0.83 909759 0.00 0.00 curl_multi_socket_action >>> 3.00 12.58 0.82 97252 0.00 0.00 Curl_hash_clean_with_criterium >>> 2.71 13.32 0.74 179704016 0.00 0.00 Curl_raw_toupper >>> 2.68 14.05 0.73 4646524 0.00 0.00 multi_runsingle >>> 2.44 14.71 0.67 13862992 0.00 0.00 client_tracing_function >>> 2.42 15.37 0.66 319735 0.00 0.00 curl_multi_remove_handle >>> 2.42 16.03 0.66 22 0.03 0.03 ares__init_list_node >>> 1.94 16.56 0.53 9930244 0.00 0.00 hostcache_timestamp_remove >>> 1.94 17.09 0.53 169320088 0.00 0.00 addbyter >>> 1.80 17.58 0.49 id_function >>> 1.36 17.95 0.37 7057146 0.00 0.00 Curl_pgrsUpdate >>> 1.36 18.32 0.37 16835 0.00 0.00 curl_multi_socket_all >>> 1.25 18.66 0.34 16719 0.00 0.00 curl_multi_perform >>> 1.21 18.99 0.33 329403 0.00 0.00 Curl_http_readwrite_headers >>> 1.17 19.31 0.32 4036624 0.00 0.00 Curl_splay >>> 1.14 19.62 0.31 20838902 0.00 0.00 Curl_raw_nequal >>> 0.82 19.85 0.23 2764123 0.00 0.00 Curl_infof >>> 0.81 20.07 0.22 5933857 0.00 0.00 ossl_recv >>> 0.77 20.28 0.21 323112 0.00 0.00 Curl_splayremovebyaddr >>> 0.75 20.48 0.21 5943991 0.00 0.00 Curl_read >>> 0.70 20.67 0.19 425174 0.00 0.00 event_del >>> 0.70 20.86 0.19 98652 0.00 0.00 Curl_if_is_interface_name >>> 0.70 21.05 0.19 8677733 0.00 0.00 Curl_socket_check >>> 0.59 21.21 0.16 4129554 0.00 0.00 fd_key_compare >>> 0.57 21.37 0.16 14017019 0.00 0.00 Curl_debug >>> 0.55 21.52 0.15 9376861 0.00 0.00 stat_data_in_add >>> 0.55 21.67 0.15 6840468 0.00 0.00 Curl_timeleft >>> 0.55 21.82 0.15 2054602 0.00 0.00 Curl_raw_equal >>> 0.55 21.97 0.15 1291611 0.00 0.00 Curl_expire >>> 0.51 22.11 0.14 16570063 0.00 0.00 curlx_tvnow >>> 0.51 22.25 0.14 13863284 0.00 0.00 scan_response >>> 0.51 22.39 0.14 5498864 0.00 0.00 Curl_setopt >>> 0.48 22.52 0.13 97490291 0.00 0.00 curl_strequal >>> 0.44 22.64 0.12 324253 0.00 0.00 Curl_http >>> 0.44 22.76 0.12 394386 0.00 0.00 ossl_connect_common >>> 0.40 22.87 0.11 3581335 0.00 0.00 Curl_getinfo >>> 0.38 22.97 0.11 26983092 0.00 0.00 alloc_addbyter >>> 0.37 23.07 0.10 8729044 0.00 0.00 Curl_client_write >>> >>> >>> ------------------------------------------------------------------------------ >>> Try before you buy = See our experts in action! >>> The most comprehensive online learning library for Microsoft developers >>> is just $99.99! 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Free future releases when you subscribe now! >>> http://p.sf.net/sfu/learndevnow-dev2 >>> _______________________________________________ >>> curl-loader-devel mailing list >>> cur...@li... >>> https://lists.sourceforge.net/lists/listinfo/curl-loader-devel >>> >> >> >> >> -- >> Regards, >> Robert Iakobashvili, Ph.D. >> >> Home: http://www.ghotit.com >> Blog: http://www.ghotit.com/category/ghotit-blogs/ >> Twitter: http://twitter.com/ghotit >> Facebook: http://facebook.com/ghotit >> ...................................................................... >> Ghotit Dyslexia >> Assistive technology that understands you >> ...................................................................... >> >> >> ------------------------------------------------------------------------------ >> Try before you buy = See our experts in action! >> The most comprehensive online learning library for Microsoft developers >> is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, >> Metro Style Apps, more. Free future releases when you subscribe now! >> http://p.sf.net/sfu/learndevnow-dev2 >> _______________________________________________ >> curl-loader-devel mailing list >> cur...@li... >> https://lists.sourceforge.net/lists/listinfo/curl-loader-devel >> > > > ------------------------------------------------------------------------------ > Try before you buy = See our experts in action! > The most comprehensive online learning library for Microsoft developers > is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, > Metro Style Apps, more. Free future releases when you subscribe now! > http://p.sf.net/sfu/learndevnow-dev2 > _______________________________________________ > curl-loader-devel mailing list > cur...@li... > https://lists.sourceforge.net/lists/listinfo/curl-loader-devel > -- Regards, Robert Iakobashvili, Ph.D. Home: http://www.ghotit.com Blog: http://www.ghotit.com/category/ghotit-blogs/ Twitter: http://twitter.com/ghotit Facebook: http://facebook.com/ghotit ...................................................................... Ghotit Dyslexia Assistive technology that understands you ...................................................................... |
