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That provides the cumulative profile (top) and then the caller/callee profiles further down (see http://igprof.org/text-output-format.html). There is a fancy cgi-bin setup for browsing the profiles, but it requires setting up your Apache server. This may or may not be worth the trouble.
Note that there is a bug in igprof (or its dependency, libunwind) that sometimes causes the process to hang. The recommended workaround is "to make sure you have a hot cache for your libraries (cat *.so >/dev/null)".