The power of OpenSolaris, with DTrace. A more detailed analysis follows in a Sun blog and a cnet article.
OpenSolaris is downloadable for free from Sun Microsystems. It is a cutting edge open source Unix with some very nice features: ZFS (Zetabyte file system, more on this one in another blog post), DTrace (which you see here doing interactive system performance analysis) and Containers (a kind of virtualisation similar to FreeBSD’s jails that allows you to run many Solarises on a single Solaris.)
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