[httperf] Delay after 302 responses

Claude Brisson claude at renegat.net
Wed Apr 25 16:04:21 PDT 2007


Hi there.

I'm doing perf & load testing on a page that sends back a HTTP 302
response code (redirection). No problem, it's not the redirected page I
want to benchmark, but the cgi issuing the redirection. I'm not asking
httperf to follow the redirection.

But the connection stays open around ten seconds after the redirect has
been received, which spoils my statistics.

Here is a screenshot of my session:


# httperf --server=...  --num-con=1 --hog --uri=... --print-reply
httperf --print-reply --hog --client=0/1 --server=... --port=80
--uri=... --send-buffer=4096 --recv-buffer=16384
--add-header='Authorization: Basic Ym94dGFsZTppcm9xdW9pcw==\n'
--num-conns=1 --num-calls=1

RH0:HTTP/1.1 302 Déplacé Temporairement
RH0:Date: Wed, 25 Apr 2007 18:08:31 GMT
RH0:Server: Apache/2.2.3 (Debian) DAV/2 SVN/1.4.2 mod_jk/1.2.18
PHP/5.2.0-8+etch1 mod_ssl/2.2.3 OpenSSL/0.9.8c
RH0:Set-Cookie: JSESSIONID=8F33EE5344FE480768791B062895CEF2; Path=/
RH0:Location: http://...
RH0:Content-Length: 0
RH0:Content-Type: text/html; charset=ISO-8859-1
RH0:
<<<< HERE a big pause of around 10 seconds >>>>
RS0: header 373 content 0 footer 0
Maximum connect burst length: 0

Total: connections 1 requests 1 replies 1 test-duration 18.553 s

Connection rate: 0.1 conn/s (18553.4 ms/conn, <=1 concurrent
connections)
Connection time [ms]: min 18553.4 avg 18553.4 max 18553.4 median 18553.5
stddev 0.0
Connection time [ms]: connect 4.5
Connection length [replies/conn]: 1.000

Request rate: 0.1 req/s (18553.4 ms/req)
Request size [B]: 478.0

Reply rate [replies/s]: min 0.0 avg 0.0 max 0.0 stddev 0.0 (3 samples)
Reply time [ms]: response 3561.5 transfer 14987.4
Reply size [B]: header 373.0 content 0.0 footer 0.0 (total 373.0)
Reply status: 1xx=0 2xx=0 3xx=1 4xx=0 5xx=0

CPU time [s]: user 3.08 system 12.76 (user 16.6% system 68.8% total
85.4%)
Net I/O: 0.0 KB/s (0.0*10^6 bps)

Errors: total 0 client-timo 0 socket-timo 0 connrefused 0 connreset 0
Errors: fd-unavail 0 addrunavail 0 ftab-full 0 other 0


Do you know where does this behaviour come from?

According to the HTTP/1.1 specification, when the response does not
contain any body, the response should be considered over at the first
empty line (which we see in the print-reply). So I'm pretty sure that on
the server side, everything is ok.

Did someone else experiment the same behaviour with 30x redirection
responses? Is it a known issue?

# httperf -V
httperf: httperf-0.8 compiled Mar 17 2006 without DEBUG without
TIME_SYSCALLS.

Debian Etch on a 686.

  Thanks,

  Claude

ps: moderator: I reposted the topic bkoz I didn't use the right sender
adress the first time. Please discard the awaiting mail since I cannot
do it myself - http://linux.hpl.hp.com/cgi-bin/mailman is not responding
(or muted by the HP proxy...).



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