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.\" 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: .\" 1. Redistributions of source code must retain the above copyright .\" 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 .\" documentation and/or other materials provided with the distribution. .\" 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 .\" without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" @(#)0.t 1.2 (Berkeley) 11/8/90 .\" .EQ delim $$ .EN .if n .ND .TL Using gprof to Tune the 4.2BSD Kernel .AU Marshall Kirk McKusick .AI Computer Systems Research Group Computer Science Division Department of Electrical Engineering and Computer Science University of California, Berkeley Berkeley, California 94720 .AB This paper describes how the \fIgprof\fP profiler accounts for the running time of called routines in the running time of the routines that call them. It then explains how to configure a profiling kernel on the 4.2 Berkeley Software Distribution of .UX for the VAX\(dd .FS \(dd VAX is a trademark of Digital Equipment Corporation. .FE and discusses tradeoffs in techniques for collecting profile data. \fIGprof\fP identifies problems that severely affects the overall performance of the kernel. Once a potential problem areas is identified benchmark programs are devised to highlight the bottleneck. These benchmarks verify that the problem exist and provide a metric against which to validate proposed solutions. Two caches are added to the kernel to alleviate the bottleneck and \fIgprof\fP is used to validates their effectiveness. .AE .LP .de PT .lt \\n(LLu .pc % .nr PN \\n% .tl '\\*(LH'\\*(CH'\\*(RH' .lt \\n(.lu .. .af PN i .ds LH 4.2BSD Performance .ds RH Contents .bp 1 .if t .ds CF May 21, 1984 .if t .ds LF .if t .ds RF McKusick .ce .B "TABLE OF CONTENTS" .LP .sp 1 .nf .B "1. Introduction" .LP .sp .5v .nf .B "2. The \fIgprof\fP Profiler" \0.1. Data Presentation" \0.1.1. The Flat Profile \0.1.2. The Call Graph Profile \0.2 Profiling the Kernel .LP .sp .5v .nf .B "3. Using \fIgprof\fP to Improve Performance \0.1. Using the Profiler \0.2. An Example of Tuning .LP .sp .5v .nf .B "4. Conclusions" .LP .sp .5v .nf .B Acknowledgements .LP .sp .5v .nf .B References .af PN 1 .bp 1 .de _d .if t .ta .6i 2.1i 2.6i .\" 2.94 went to 2.6, 3.64 to 3.30 .if n .ta .84i 2.6i 3.30i .. .de _f .if t .ta .5i 1.25i 2.5i .\" 3.5i went to 3.8i .if n .ta .7i 1.75i 3.8i ..
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