We should also mention that the July 2008 release of Sun Studio Express also includes a number of cool performance tools:

New Performance Tuning and Troubleshooting Tools

The Simple Performance Optimization Tool (SPOT)

Documentation for SPOT:

spot(1) man page
User Guide on docs.sun.com

In this Express release, the spot command is available only for the Solaris OS on SPARC platforms.

Discover - Memory Access Error Tool

Documentation for Discover:

discover(1) man page
Discover User Guide in PDF.

NOTE: Discover in this Express release does not have Lite mode ("-l" flag)implemented.

Discover is only available on Solaris OS on SPARC platforms for Express.

BIT - Binary Improvement Tool

BIT provides a set of tools for improving the performance of application binaries.

Documentation:

bit(1) man page.
BIT User Guide (PDF)

NOTE: The ‑xbinopt=prepare option is not required if compilation is done using this Studio Express or GCCFSS 4.2.0 with the following operating systems: Solaris 10 Update 5; Solaris 10 with Patch 127111-07 installed; Solaris 11 build 70 or later.

In this Express release, bit is only available for the Solaris OS on SPARC platforms.

ATS - Automatic Tuning and Troubleshooting System

Documentation for ATS:

ats(1) man page.
ATS User's Guide

In this Express release, ats is available for the Solaris OS on SPARC and x86/x64 platforms.