random musings from a twisted mind
playing with tcptrace and xplot
# tcpdump -ni en0 port 80 -w output.trace
# tcptrace -G output.trace
# xplot *tput.xpl
From the online manpage:
- Yellow: instantaneous packets
- Red: Throughput for the last few packets
- Blue: Throughput since the start of the stream/connection
Other useful graphs:
- _owin.xpl – outstanding data/congestion
- _rtt.xpl – round trip time/time
- _ssize.xpl – segment size/time
- _tput.xpl – throughput/time
- _tsg.xpl – time sequence graph
- _tline.xpl – Timeline graph – W Richard Stevens style
Just some notes here so I don’t forget the basics – manual over at here.
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interesting benefits of solaris
about 1 year ago - 1 comment
well this is slightly surprising, but in a very good way, and does lead to some interesting suggestions on how to best to improve matters, but look at the following graph of FAST ESP query latency: Notice that the average latency drops as we use the server more . . . but WHY? Well that’s
argh, SNMP can really chafe!
about 1 year ago - No comments
Using version 1: % snmpget -c COMMSTRING -M /usr/local/share/snmp/mibs -v 1 -m USAGE-MIB:PROXY-MIB:REDLINE-STATS-MIB:REDLINE-STATS-MIB:REDLINE-CONFIG-M IB hostname REDLINE-STATS-MIB::sessActive.0 Error in packet Reason: (noSuchName) There is no such variable name in this MIB. Failed object: REDLINE-STATS-MIB::sessActive.0 Using version 2 (2c): % snmpget -c COMMSTRING -M /usr/local/share/snmp/mibs -v 2c -m USAGE-MIB:PROXY-MIB:REDLINE-STATS-MIB:REDLINE-STATS-MIB:REDLINE-CONFIG-M IB hostname REDLINE-STATS-MIB::sessActive.0 REDLINE-STATS-MIB::sessActive.0 = Counter64: 12247 Slightly
solaris zone utilisation via SNMP
about 1 year ago - No comments
It’s been a bug-bear for a long time for me that the CPU metrics when querying a Solaris 10 host are global and not zone specific (which of course makes sense, just makes it harder to track zone utilisation). So finally wrote a basic perl script that will provide that information via a SNMP mib,
scaling web apps
about 2 years ago - No comments
A little video, thin on detail of course, but hints at some home truths on building/designing scale-able applications (and i’d go so far to say that they are applicable to ALL applications not just webapps)
http://joyent.vo.llnwd.net/o25/videos/LinkedIn-Bumpersticker-LED-Scaling-Rails.m4v
Of course, I know Ben Rockwood like’s his solaris and F5′s – but that’s not going to surprise many (and I just LOVE f5s)
And here’s a blog entry with the details on /how/ that’s done:-
http://www.joyeur.com/2008/04/18/the-wonders-of-fbref-and-irules-serving-pages-from-facebooks-cache
. . . basically as simple as:-
when HTTP_REQUEST {
if { [HTTP::uri] contains "/popular_something/list"} {
HTTP::respond 200 content "<fb:ref handle='[HTTP::uri]'/>"
} else {
pool facebook.application_server_pool
}
}
recent applications window
about 2 years ago - No comments
This little snippet will give you a new little window for all those recent applications you launch – I seem to have picked up a habit for closing applications down when I stop working with them for an hour or two (pages etc.)
defaults write com.apple.dock persistent-others -array-add \
'{ "tile-data" = { "list-type" = 1; }; "tile-type" = "recents-tile"; }'
killall Dock
rss browsing on macos
about 2 years ago - No comments
Hmm, so far in the last month or so I’ve been slowly running into issues with Mail.App just deciding not to download/refresh RSS feeds until I explicitly tell it to (which is annoying to say the least). So first had a play with Endo which is pretty good – apart from the annoyance that I have enough busy RSS feeds (blogs.sun.com and java.sun.com for instance) that the only real way to keep on top is to use Apple + 9 to only show unread posts.
The does have the little drawback that I then lose sight of the ones I’ve tagged – and it is a global option across all groups – yuck. So having just exported my feed list into OPML and then imported into NetNewsWire and it just worked (also looks a lot more like a mail client which i prefer)
Will have to see how it goes . . .
the leopard has it’s cafine!
about 2 years ago - No comments
Hopefully I wont get into trouble from apple for even mentioning that they posted a new preview for java 6 on http://developer.apple.com/ on 18th Dec 2007
I’ll have to install and see how well it runs!
Memcached in Solaris
about 2 years ago - No comments
Oh, so OpenSolaris is going to come with memcached pre-configured/installed – which is pretty nice; now just for the integration into other things . . .
helping hands with puppets
about 3 years ago - No comments
Will have to have a good look at [http://puppet.reductivelabs.com/ puppet], looks like a re-invention of cfengine, just using ruby instead (which is a good thing). Some of the recipes look really useful, though might have to write a few for solaris zfs/zones etc.
Just a big shame that the trac pages look so very broken within the theme (does kind of put you off)
Zones
about 3 years ago - No comments
Configure the zone you want, this is just a basic configuration (suited to a name server – that inherits the global zones /var/named)
# zonecfg -z solzone
solzone: No such zone configured
Use 'create' to begin configuring a new zone.
zonecfg:solzone> create
zonecfg:solzone> set zonepath=/u01/zones/solzone
zonecfg:solzone> set autoboot=true
zonecfg:solzone> add net
zonecfg:solzone:net> set address=10.10.10.20/24
zonecfg:solzone:net> set physical=bge0 zonecfg:solzone:net> end
zonecfg:solzone> add fs
zonecfg:solzone:fs> set type=lofs
zonecfg:solzone:fs> set special=/u01/zonedata/solzone
zonecfg:solzone:fs> set dir=/u01
zonecfg:solzone:fs> end
zonecfg:solzone> add inherit-pkg-dir
zonecfg:solzone:inherit-pkg-dir> set dir=/var/named
zonecfg:solzone:inherit-pkg-dir> end
zonecfg:solzone> add attr
zonecfg:solzone:attr> set name=comment
zonecfg:solzone:attr> set type=string
zonecfg:solzone:attr> set value="test solaris zone"
zonecfg:solzone:attr> end
zonecfg:solzone> verify
zonecfg:solzone> commit
zonecfg:solzone> exit
And now install and boot the zone
# zoneadm -z solzone install
# zoneadm -z solzone boot