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<title>Using as: i386-LWP</title>
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Next: <a href="i386_002dBMI.html#i386_002dBMI" accesskey="n" rel="next">i386-BMI</a>, Previous: <a href="i386_002dSIMD.html#i386_002dSIMD" accesskey="p" rel="previous">i386-SIMD</a>, Up: <a href="i386_002dDependent.html#i386_002dDependent" accesskey="u" rel="up">i386-Dependent</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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<a name="AMD_0027s-Lightweight-Profiling-Instructions"></a>
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<h4 class="subsection">9.16.11 AMD’s Lightweight Profiling Instructions</h4>
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<a name="index-LWP_002c-i386"></a>
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<a name="index-LWP_002c-x86_002d64"></a>
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<p><code>as</code> supports AMD’s Lightweight Profiling (LWP)
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instruction set, available on AMD’s Family 15h (Orochi) processors.
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</p>
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<p>LWP enables applications to collect and manage performance data, and
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react to performance events. The collection of performance data
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requires no context switches. LWP runs in the context of a thread and
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so several counters can be used independently across multiple threads.
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LWP can be used in both 64-bit and legacy 32-bit modes.
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</p>
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<p>For detailed information on the LWP instruction set, see the
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<cite>AMD Lightweight Profiling Specification</cite> available at
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<a href="http://developer.amd.com/cpu/LWP">Lightweight Profiling Specification</a>.
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