Red Hat Developer Toolset 1.x User Guide - Linux

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50 Chapter 8. Valgrind
Red Hat Developer Toolset 1.x User Guide 51 Chapter 9. OProfile OProfile is a low overhead, system-wide profiler that uses the performance monitoring hardware on the processor to retrieve information about the kernel and executables on the system, such as when memory is referenced, the number of level 2 cache (L2) requests, and the number of hardware interrupts received. It consists of a configuration utility, a daemon for collecting data, and a number of tools that can be used to transform the data into a human-readable form. For a complete list of tools that are distributed with the Red Hat Developer Toolset version of OProfile, refer to Table 9.1, “Tools Distributed with OProfile for Red Hat Developer Toolset”. OProfile profiles an application without adding any instrumentation by recording the details of every nth event. This allows it to consume fewer resources than Valgrind, but also causes its samples to be less precise. Unlike Valgrind, which only collects data for a single process and its children in user-space, OProfile is well suited to collect system-wide data on both user-space and kernel-space processes, and requires root privileges to run. Red Hat Developer Toolset is distributed with OProfile 0.9.7. This version is more recent than the version included in Red Hat Enterprise Linux and provides numerous bug fixes and enhancements. Table 9.1. Tools Distributed with OProfile for Red Hat Developer Toolset Name oprofiled opcontrol opannotate oparchive opgprof ophelp opimport opjitconv opreport Description The OProfile daemon that collects profiling data. Starts, stops, and configures the OProfile daemon. Generates an annotated source file or assembly listing form the profiling data. Generates a directory containing executable, debug, and sample files. Generates a summary of a profiling session in a format compatible with gprof. Displays a list of available events. Converts a sample database file from a foreign binary format to the native format. Converts a just-in-time (JIT) dump file to the Executable and Linkable Format (ELF). Generates image and symbol summaries of a profiling session. 9.1. Installing OProfile In Red Hat Developer Toolset, OProfile is provided by the devtoolset-1.1-oprofile package, and is automatically installed with devtoolset-1.1 as described in Section 1.5, “Installing Red Hat Developer Toolset”. 9.2. Using OProfile To run any of the tools that are distributed with OProfile, type the following at a shell prompt as root: scl enable devtoolset-1.1 'tool [option...]' Refer to Table 9.1, “Tools Distributed with OProfile for Red Hat Developer Toolset” for a list of tools that are distributed with Valgrind. For example, to use the ophelp command to list available events in the XML format, type:
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