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/Local Store/td_26_brendangregg.db-journal 503 67261 W 308056800 4096 Tweet Deck ??
/Local Store/td_26_503 67261 W 308056856 4096 Tweet Deck ??
The output columns show: UID = user ID, PID = process ID (unique identifier for the process), D = direction (R = read, W = write), BLOCK = location on disk, SIZE = I/O size in bytes, COMM = process name, PATHNAME = trailing portion of file pathname.
In that output I caught Google Chrome reading from a cache file (“data_2″), and writing to cookie files (“Cookies-journal” and “Cookies”).
/Cookies/Cookies.plist_tmp_67261_0503 67261 W 384070640 4096 Tweet Deck ??
/Local Store/td_26_brendangregg.db-journal 503 67261 W 384070640 4096 Tweet Deck ??
If firefox stayed that high you could look for the responsible tab and close it down, or restart Firefox. DTrace requires admin privileges, so to use it you’ll usually need to type in a password to authenticate, provided you have administrator access (if you aren’t sure you do, click here to see how to check).
You can run DTrace by prefixing your DTrace commands with “sudo”, which will prompt for the password the first time around (but not for some time after that).
It provides data for Apple’s Instruments tool, as well as a collection of command line tools that are implemented as DTrace scripts.Most of these scripts are already installed, a few are from the new DTrace book.If you’ve never run a DTrace script before or even used the command line, here’s a basic walkthrough: Run the “Terminal” application.Tweet Deck also wrote to database files (“td_26_brendangregg.db” and “td_26_brendangregg.db-journal”). ” is where the path information ends for iosnoop (if you are a darwin programmer and want to take a swing at improving that, see the fi_pathname translator in /usr/lib/dtrace/io.d).The “-h” option lists options (don’t need “sudo” for this): Brendan-2:~ brendan$ iosnoop -h USAGE: iosnoop [-a|-A|-Deghi Nostv] [-d device] [-f filename] [-m mount_point] [-n name] [-p PID] iosnoop # default output -a # print all data (mostly) -A # dump all data, space delimited -D # print time delta, us (elapsed) -e # print device name -g # print command arguments -i # print device instance -N # print major and minor numbers -o # print disk delta time, us -s # print start time, us -t # print completion time, us -v # print completion time, string -d device # instance name to snoop -f filename # snoop this file only -m mount_point # this FS only -n name # this process name only -p PID # this PID only eg, iosnoop -v # human readable timestamps iosnoop -N # print major and minor numbers iosnoop -m / # snoop events on filesystem / only For tricky performance issues I often use “-sto D” to get start and end timestamps for each I/O in microseconds, and a couple of different types of I/O time calculations.