Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3



Oh boy, wasn't this thread supposed to focus the syslets/threadlets ... :)



On Thu, 1 Mar 2007, Eric Dumazet wrote:

On Thursday 01 March 2007 16:23, Evgeniy Polyakov wrote:
They are there, since ab runs only 50k requests.
If I change it to something noticebly more than 50/80k, ab crashes:
# ab -c8000 -t 600 -n800000000 http://192.168.0.48/
This is ApacheBench, Version 2.0.40-dev <$Revision: 1.146 $> apache-2.0
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Copyright 2006 The Apache Software Foundation, http://www.apache.org/

Benchmarking 192.168.0.48 (be patient)
Segmentation fault

Are there any other tool suitable for such loads?
I only tested httperf (which is worse, since it uses poll/select) and
'ab'.

Btw, host machine runs 100% too, so it is possible that client side is
broken (too).

I have similar problems here, ab test just doesnt complete...

I am still investigating with strace and tcpdump.

In the meantime you could just rewrite it (based on epoll please :) ), since
it should be quite easy to do this (reverse of evserver_epoll)

I have a simple one based on coroutines and epoll. You need libpcl and
coronet. Debian hs a package named libpcl1-dev for libpcl, otherwise:

http://www.xmailserver.org/libpcl.html

and 'configure --prefix=/usr && sudo make install'.
Coronet is here:

http://www.xmailserver.org/coronet-lib.html

here just 'configure && make'.
Inside the "test" directory there a simple loader named cnhttpload:

cnhttpload -s HOST -n NCON [-p PORT (80)] [-r NREQS (1)] [-S STKSIZE (8192)]
[-M MAXCONNS] [-t TMUPD (1000)] [-a NACTIVE] [-T TMSAMP (200)]
[-h] URL ...

HOST = Target host
PORT = Target host port
NCON = Number of connections to the server
NACTIVE = Number of active (live) connections
STKSIZE = Stack size for coroutines
NREQS = Number of request done for each connection (better be 1 if
your server do not support keep-alive)
MAXCONNS = Maximum number of total connections done to the server. If not
set, the test will continue forever (well, till a ^C)
TMUPD = Millisec time of stats update
TMSAMP = Millisec internal average-update time
URL = Target doc (not http:// or host, just doc path)

So for the particular test my inbox was flooded with :), you'd use:

cnhttpload -s HOST -n 80000 -a 8000 -S 4096




- Davide


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