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.\" $OpenBSD: 1.t,v 1.3 2003/06/02 23:30:09 millert Exp $
.\"
.\" Copyright (c) 1984 M. K. McKusick
.\" Copyright (c) 1984 The Regents of the University of California.
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
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.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
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.\" 3. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
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.\" @(#)1.t 1.2 (Berkeley) 11/8/90
.\"
.ds RH Introduction
.NH 1
Introduction
.PP
The purpose of this paper is to describe the tools and techniques
that are available for improving the performance of the the kernel.
The primary tool used to measure the kernel is the hierarchical
profiler \fIgprof\fP.
The profiler enables the user to measure the cost of
the abstractions that the kernel provides to the user.
Once the expensive abstractions are identified,
optimizations are postulated to help improve their performance.
These optimizations are each individually
verified to insure that they are producing a measurable improvement.
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