Tcpcopy,an online request replication tool fit for nginx

Tcpcopy is an online request replication tool .
It may be useful for migrating to nginx from apache or

Posted at Nginx Forum:,217680,217680#msg-217680

you can use tcpcopy to compare the performances of apache and nginx.

Posted at Nginx Forum:,217680,217682#msg-217682

tcpcopy helps me a lot when deveploping the netease ad system and other

Posted at Nginx Forum:,217680,217684#msg-217684

An example:
Suppose 13 and 14 are online machines, 148 is a target machine which
is similar to
the online machines, and 12321 is used both as local port and remote
port. We
use tcpcopy to test if 148 can endure two times of current online

Using tcpcopy to perform the above test task.
the target machine(148)
   # modprobe ip_queue (if not run up)
   # iptables -I OUTPUT -p tcp --sport 12321 -j QUEUE (if not set)
   # ./interception
online machine(13):
   # ./tcpcopy xx.xx.xx.13 12321 xx.xx.xx.148 12321
online machine(14):
   # ./tcpcopy xx.xx.xx.14 12321 xx.xx.xx.148 12321

Cpu load and memory usage are as follows:
    13 cpu:
       11124 adrun 15 0 193m 146m 744 S 18.6 7.3 495:31.56

11281 root 15 0 65144 40m 1076 S 12.3 2.0 0:47.89 tcpcopy
14 cpu:
16855 adrun 15 0 98.7m 55m 744 S 21.6 2.7 487:49.51
16429 root 15 0 41156 17m 1076 S 14.0 0.9 0:33.63 tcpcopy
148 cpu :
25609 root 15 0 76892 59m 764 S 49.6 2.9 63:03.14
20184 root 15 0 5624 4232 292 S 17.0 0.2 0:52.82

Access log analysis:
    13 online machine: grep 'Tue 11:08' access_0913_11.log |wc -l

:89316, 1489 reqs/sec
14 online machine: grep ‘Tue 11:08’ access_0913_11.log |wc -l
:89309, 1488 reqs/sec
148 test machine: grep ‘Tue 11:08’ access_0913_11.log |wc -l
:178175, 2969 reqs/sec
request loss rate:

From the above, we can see that the target machine can endure two

times of current
online stress.

What about the cpu load ?
tcpcopy on online machine 13 occupies 12.3% of cpu load, tcpcopy on

online 14
occupies 14% and interception on target machine 148 occupies 17%. We
can see
that the cpu load is very low here, and so is the memory usage.

Posted at Nginx Forum:,217680,217734#msg-217734

a stress test for nginx written in chinese.

Posted at Nginx Forum:,217680,217735#msg-217735

It is a request replication tool and is mainly for testing tasks
using netlink and raw sockets

It can help you find bugs in your online project without actually
being online.
And it can also be used to test the stress that a system could

For example, if your system already has "memcached" subsystem and

you want to
use “membase” to replace it, tcpcopy can assist you to test
“membase”. While your
old memcached system is still running online, tcpcopy could copy the
flow of packets
from memcached to membase. From the point view of membase, the flow
is accessing
membase(just like membase online), and it will not affect memcached
at all except
network bandwidth and a little cpu load.

1) Distributed Stress Test
You can use online data to test the stress that your target
machine can endure. It is better
than apache ab tool and you can find bugs that only occur during
high-stress situations.
2) Hot Backup
It is very suitable for backup tasks if connections are
short-lived and the request loss rate
is very low(1/100000).
3) Normal Online Test
You can find whether the new system is stable and find bugs that
only occur in actual
online environments.
4) Comparison Test
For example, you can use tcpcopy to compare the performances of
apache and nginx.

1)real time
4)easy to use

Posted at Nginx Forum:,217680,217954#msg-217954

tcpcopy-0.2.1.tar.gz is now available.
Try it and I believe you will like this tool

Posted at Nginx Forum:,217680,218138#msg-218138

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