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: Fred H. <di...@gm...> - 2012-03-05 16:19:23
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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
>>
>>
>>
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>
>
> --
> Regards,
> Robert Iakobashvili, Ph.D.
>
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