Hi,
I read this article:
http://mongrel.rubyforge.org/docs/how_many_mongrels.html
and decided to play around a little bit…
I didn’t test it on mongrel, but on a Nginx (on a default page saying
“Welcome to nginx”)… just to get the feel for the numbers… I’m using
Slicehost VPS with 256 MB RAM…
Here are the results:
$ time httperf --server www.server.com --port 80 --num-conns 25
httperf --client=0/1 --server=unebo --port=80 --uri=/ --send-buffer=4096
–recv-buffer=16384 --num-conns=25 --num-calls=1
Maximum connect burst length: 1
Total: connections 25 requests 25 replies 25 test-duration 10.048 s
Connection rate: 2.5 conn/s (401.9 ms/conn, <=1 concurrent connections)
Connection time [ms]: min 362.1 avg 401.9 max 451.5 median 402.5 stddev
15.4
Connection time [ms]: connect 204.2
Connection length [replies/conn]: 1.000
Request rate: 2.5 req/s (401.9 ms/req)
Request size [B]: 56.0
Reply rate [replies/s]: min 2.4 avg 2.4 max 2.4 stddev 0.0 (2 samples)
Reply time [ms]: response 197.6 transfer 0.1
Reply size [B]: header 216.0 content 151.0 footer 0.0 (total 367.0)
Reply status: 1xx=0 2xx=25 3xx=0 4xx=0 5xx=0
CPU time [s]: user 0.53 system 9.00 (user 5.3% system 89.6% total 94.9%)
Net I/O: 1.0 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
real 0m10.059s
user 0m0.528s
sys 0m9.013s
$ time httperf --server www.server.com --port 80 --num-conns 25 --rate
2.5
httperf --client=0/1 --server=unebo --port=80 --uri=/ --rate=2.5
–send-buffer=4096 --recv-buffer=16384 --num-conns=25 --num-calls=1
Maximum connect burst length: 1
Total: connections 25 requests 25 replies 25 test-duration 10.005 s
Connection rate: 2.5 conn/s (400.2 ms/conn, <=3 concurrent connections)
Connection time [ms]: min 323.6 avg 411.9 max 822.9 median 394.5 stddev
90.9
Connection time [ms]: connect 214.4
Connection length [replies/conn]: 1.000
Request rate: 2.5 req/s (400.2 ms/req)
Request size [B]: 56.0
Reply rate [replies/s]: min 2.4 avg 2.4 max 2.4 stddev 0.0 (2 samples)
Reply time [ms]: response 197.5 transfer 0.1
Reply size [B]: header 216.0 content 151.0 footer 0.0 (total 367.0)
Reply status: 1xx=0 2xx=25 3xx=0 4xx=0 5xx=0
CPU time [s]: user 0.46 system 7.59 (user 4.6% system 75.9% total 80.4%)
Net I/O: 1.0 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
real 0m10.014s
user 0m0.456s
sys 0m7.596s
Since the article said “start with 100”, I’m a little bit ‘worried’,
because I hit 10s with only 25 connections… Is this normal? Can someone
make more sense out of this so we can make a fruitful discussion out of
it? I’m really interested in understanding more about the topic.
Thank you!
david
