Re: why dig (tcp) is much faster than wget (gethostbyname?) ?
On 11/04/13 15:08, baobeileaf wrote:
hi guys,
check this out:
[root@localhost /]# time dig www.hyblr.com +tcp
; <<>> DiG 9.9.3-rl.156.01-P1-RedHat-9.9.3-3.P1.fc18 <<>>
www.hyblr.com +tcp
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 35033
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 3, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;www.hyblr.com. IN A
;; ANSWER SECTION:
www.hyblr.com. 3 IN A 111.8.98.138
;; AUTHORITY SECTION:
www.hyblr.com. 3518 IN NS ns2.hyblr.com.
www.hyblr.com. 3518 IN NS ns3.hyblr.com.
www.hyblr.com. 3518 IN NS ns1.hyblr.com.
;; Query time: 10 msec
;; SERVER: 111.8.14.18#53(111.8.14.18)
;; WHEN: Mon Nov 04 14:56:40 CST 2013
;; MSG SIZE rcvd: 112
real 0m0.040s
user 0m0.014s
sys 0m0.018s
[root@localhost /]# time wget -O /dev/null www.hyblr.com
--2013-11-04 14:55:18-- http://www.hyblr.com/
Resolving www.hyblr.com (www.hyblr.com)... 111.8.98.138
Connecting to www.hyblr.com (www.hyblr.com)|111.8.98.138|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: unspecified [text/html]
Saving to: ‘/dev/null’
[ <=>
] 81,980 --.-K/s in 0.05s
2013-11-04 14:55:33 (1.44 MB/s) - ‘/dev/null’ saved [81980]
real 0m15.203s
user 0m0.007s
sys 0m0.014s
I've read the sourcecode of wget. Maybe the difference comes from gethostbyname.
Anyone can help me? or tell me where's the sourcecode of gethostbyname.
I think the question you should be asking is this.....
[egreshko@meimei ~]$ time wget -O /dev/null www.hyblr.com
--2013-11-04 16:36:01-- http://www.hyblr.com/
Resolving www.hyblr.com (www.hyblr.com)... 111.8.98.138
Connecting to www.hyblr.com (www.hyblr.com)|111.8.98.138|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: unspecified [text/html]
Saving to: ‘/dev/null’
[ <=> ] 81,736 225KB/s in 0.4s
2013-11-04 16:36:17 (225 KB/s) - ‘/dev/null’ saved [81736]
real 0m15.498s
user 0m0.003s
sys 0m0.004s
as opposed to this....
[egreshko@meimei ~]$ time wget -O /dev/null 111.8.98.138
--2013-11-04 16:36:50-- http://111.8.98.138/
Connecting to 111.8.98.138:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: unspecified [text/html]
Saving to: ‘/dev/null’
[ <=> ] 81,980 261KB/s in 0.3s
2013-11-04 16:36:50 (261 KB/s) - ‘/dev/null’ saved [81980]
real 0m0.437s
user 0m0.003s
sys 0m0.002s
And then notice this....
[egreshko@meimei ~]$ host www.hyblr.com
www.hyblr.com has address 111.8.98.138
;; connection timed out; trying next origin
Host www.hyblr.com not found: 3(NXDOMAIN)
Host www.hyblr.com not found: 3(NXDOMAIN)
I suspect a DNS configuration issue for that host/domain.
--
Getting tired of non-Fedora discussions and self-serving posts