curl-loader https: low performance due to DNS query?
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curl-loader https: low performance due to DNS query?
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From: Fred H. <di...@gm...> - 2012-03-05 14:28:49
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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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