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When Apache met DTrace -- meet mod_dtrace
Posted:
Nov 27, 2005 11:36 PM
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Howdy,
I have been working on an Apache DTrace module for the past few weeks, and
just released version 0.2a. This module integrates Dtrace probes into
Apache through the Apache hook framework. These probes can be used to
observe and correlate a wide-variety of application and system behavior,
which I have found useful for correlating network/virtual memory events
with requests erved by Apache. I have written a few scripts to show some
of the things I have been able to do with mod_Dtrace, and have attached
[1] some screenshots to this e-mail. If your interested in using
mod_dtrace, you can grab the source code and shell scripts from my web
site:
http://daemons.net/~matty
This is still a work in progress, and I would love to get feedback (e.g.,
script enhancements, code enhancements, feature requests, recommendations
etc.) from the folks on the list. I would like to thank Clay McClure,
Brendan Gregg, Adam Leventhal, Bryan Cantrill, Sean McGrath and Mike Shapiro
for all of their help! Thanks a ton guys!!!!!! You rock!!!!!!!!!!!!!
Thanks,
- Ryan
--
UNIX Administrator
http://daemons.net/~matty
[1]
viewreqs.pl allows you to view requests by HTTP method type:
$ viewreqs.pl -d 5
Timestamp GETs POSTs HEADs TRACEs
02:05:59 0 0 0 0
02:06:04 12 0 0 0
02:06:09 15 0 0 0
02:06:14 59 0 0 0
02:06:19 68 0 0 0
02:06:24 70 0 0 0
viewreqsbyproc.d allows you to view requests by httpd process id:
$ viewreqsbyproc.d
Execname Process Requests Processed
httpd 19103 16
httpd 19152 17
httpd 19101 17
httpd 19102 19
httpd 19104 20
httpd 19105 20
viewbrowsers.pl allows you to view requests by browser type:
$ viewbrowsers.pl
Sampling browser data for 60 seconds...
Browser GETs POSTs HEADs TRACEs
Firefox 34 0 0 0
Safari 20 0 0 0
Wget 7 0 0 0
viewserver.pl allows you to view requests by virtual server:
$ viewserver.pl -d 60
Sampling virtual server data for 60 seconds...
Server GETs POSTs HEADs TRACEs
www.foo.com 101 0 0 0
www.bar.com 23 0 0 0
responsecodes.d allows you to view response codes aggregated by
the number of times they have been used in an HTTP response:
$ responsecodes.d
Sampling response code data (Ctrl-C to stop):
Response Code Count
404 4
200 22
responsecodes.pl allows you to view response codes along with the URI
and file they are associated with:
$ responsecodes.pl
Response Code URI File Name
200 / /tmp/apache/htdocs/index.html.var
304 /apache_pb.gif /tmp/apache/htdocs/apache_pb.gif
200 / /tmp/apache/htdocs/index.html.var
200 /apache_pb.gif /tmp/apache/htdocs/apache_pb.gif
404 /favicon.ico /tmp/apache/htdocs/favicon.ico
responsecodes.pl also allows you to filter by response codes (e.g., 404
document not found):
$ responsecodes.pl -c 404
Response Code URI File Name
404 /favicon.ico /tmp/apache/htdocs/favicon.ico
404 /favicon.ico /tmp/apache/htdocs/favicon.ico
404 /favicon.ico /tmp/apache/htdocs/favicon.ico
404 /favicon.ico /tmp/apache/htdocs/favicon.ico
redirects.pl allows you to view HTTP 301/302 redirects along with the
URI and URL they apply to:
$ redirects.pl
Response Code URI Requested Redirect Sent To Client
301 /yikes http://192.168.1.3:8080/yikes2
301 /foo http://192.168.1.3:8080/bar
301 /bling http://192.168.1.3:8080/crunk
requestsize.d allows you to view request sizes in a qunatized
distribution:
$ requestsize.d
dtrace: script 'requestsize.d' matched 1 probe
httpd 5549
value ------------- Distribution ------------- count
-1 | 0
0 |@@@@@@@@@@@@@@@@@@@@@@@@ 43
1 | 0
2 | 0
4 | 0
8 | 0
16 | 0
32 | 0
64 | 0
128 | 0
256 |@@@@ 8
512 | 0
1024 | 0
2048 |@@@@@@@@@@@@ 22
4096 | 0
dapachetop allows you to view requests in a "top"-like display:
$ dapachetop 10
2005 Nov 28 02:01:00, load: 0.00, Requests: 4, Bytes: 8 Kb
Requests : GET: 4 POST: 0 HEAD: 0 TRACE: 0
Response Codes : 1XXL 0 2XX: 4 3XX: 0 4XX: 0
Requests Request/Sec Bytes Sent URI
2 .20 4 Kb /foo
1 .10 2 kb /bar
1 .10 2 kb /bling
_______________________________________________
dtrace-discuss mailing list
dtrace-discuss at opensolaris dot org
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