Those instructions are out of date, the sflow option is no longer required. Just build and run the sFlow instrumented version of Memcached the way you normally would - there are no sFlow specific options.
You should also install a Host sFlow agent (hsflowd) on each server in your Memcached cluster. http://host-sflow.sourceforge.net/ Configuration of the sFlow settings is handled by hsflowd - which also sends hosts CPU, memory, disk and network performance metrics. The following article describes how sFlow agents interact to monitor a server: http://blog.sflow.com/2012/01/host-sflow-distributed-agent.html What software are you planning to use for performance reporting? The latest version of Ganglia will trend host and memcached performance metrics from your cluster: http://blog.sflow.com/2011/12/using-ganglia-to-monitor-memcache.html There are also some scripts you can modify to look at top keys, top missed keys, top clients, value sizes etc http://blog.sflow.com/2010/10/memcached-hot-keys.html http://blog.sflow.com/2010/10/memcached-missed-keys.html http://blog.sflow.com/2012/01/forwarding-using-sflowtool.html If you are going to Velocity, you might be interested in the talk on optimizing HTTP/Memcached performance using sFlow (the talk description includes some interesting examples): http://velocityconf.com/velocity2012/public/schedule/detail/23487 Peter On Wed, May 2, 2012 at 1:36 AM, benjaminDC <[email protected]> wrote: > What I have done so far: > > Clean deb 6 64bit install: > > apt-get install git > apt-get install autoconf > apt-get install automake > apt-get install autotools-dev > apt-get install libevent-dev > > git clone https://github.com/sflow/memcached.git > > ./autogen.sh > > ./configure --enable-sflow > > make > make check > make install > > # memcached -u nobody -o sflow=on > Illegal suboption "sflow=on" > > :-/ Am I doing something (very) wrong? > > Op dinsdag 28 september 2010 21:30:04 UTC+2 schreef neilmckee het volgende: >> >> The following git fork includes these sFlow changes: >> >> http://github.com/sflow/memcached >> >> To run with sFlow enabled: >> >> ./autogen.sh >> ./configure --enable-sflow >> make >> ./memcached -u nobody -o sflow=on >> >> Neil >> >> >> On Sep 27, 9:59 am, neilmckee <[email protected]> wrote: >> > I posted this patch as an enhancement to the tracking >> > system:http://code.google.com/p/memcached/issues/detail?id=157 >> > >> > My original post wasn't very clear about the problem space being >> > addressed: it is targeted at the challenge of identifying "hot keys" >> > in an operational cluster. For background, >> > see:http://blog.sflow.com/2010/09/memcached.html >> > >> > Neil >> > >> > On Sep 23, 5:19 pm, neilmckee <[email protected]> wrote: >> > >> > > Hello All, >> > >> > > Here is a patch against the central repo that adds sFlow monitoring. >> > > Please comment!http://www.inmon.com/technology/sfmc_20100923.zip >> > >> > > For background on this, please >> > > read:http://blog.sflow.com/2010/08/sflow-host-structures.html >> > >> > > If you compile with this patch, then you can run with "memcached -u >> > > nobody -o sflow=on", and it will pick up configuration from /etc/ >> > > hsflowd.auto, such as: >> > >> > > sampling=400 >> > > polling=20 >> > > agentIP=10.0.0.112 >> > > collector=10.0.0.111 6343 >> > >> > > "agentIP" should be the IP of the server, and "collector" should be >> > > the IP of an sflow collector such as >> > > "sflowtool":http://www.inmon.com/bin/sflowtool-3.17.tar.gz >> > >> > > (This config file is generated automatically if you install hsflowd, >> > > the host sFlow daemon from host-sflow.sourceforge.net which >> > > contributes an sFlow feed of server performance stats) >> > >> > > Neil >> > >> > > NOTES: >> > >> > > (1). Provided the sampling-rate is set appropriately, the overhead >> > > should be roughly equivalent to adding one extra stats counter. The >> > > critical path is just a decrement-and-test on a per-thread counter (no >> > > locking). >> > >> > > (2). The changes are all within "#ifdef SFLOW" except for (3) below. >> > >> > > (3). I changed memcached.h:struct conn->request_addr to be of type >> > > struct sockaddr_storage so it would work for IPv6 too.
