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#!/usr/sbin/dtrace -Zs
/*
* sh_wasted.d - measure Bourne shell elapsed times for "wasted" commands.
* Written for the sh DTrace provider.
*
* $Id: sh_wasted.d 25 2007-09-12 09:51:58Z brendan $
*
* USAGE: sh_wasted.d { -p PID | -c cmd } # hit Ctrl-C to end
*
* This script measures "wasted" commands - those which are called externally
* but are in fact builtins to the shell. Ever seen a script which calls
* /usr/bin/echo needlessly? This script measures that cost.
*
* FIELDS:
* FILE Filename of the shell or shellscript
* NAME Name of call
* TIME Total elapsed time for calls (us)
*
* IDEA: Mike Shapiro
*
* Filename and call names are printed if available.
*
* COPYRIGHT: Copyright (c) 2007 Brendan Gregg.
*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at Docs/cddl1.txt
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* CDDL HEADER END
*
* 09-Sep-2007 Brendan Gregg Created this.
*/
#pragma D option quiet
dtrace:::BEGIN
{
isbuiltin["echo"] = 1;
isbuiltin["test"] = 1;
/* add builtins here */
printf("Tracing... Hit Ctrl-C to end.\n");
self->start = timestamp;
}
sh$target:::command-entry
{
self->command = timestamp;
}
sh$target:::command-return
{
this->elapsed = timestamp - self->command;
this->path = copyinstr(arg1);
this->cmd = basename(this->path);
}
sh$target:::command-return
/self->command && !isbuiltin[this->cmd]/
{
@types_cmd[basename(copyinstr(arg0)), this->path] = sum(this->elapsed);
self->command = 0;
}
sh$target:::command-return
/self->command/
{
@types_wasted[basename(copyinstr(arg0)), this->path] =
sum(this->elapsed);
self->command = 0;
}
proc:::exit
/pid == $target/
{
exit(0);
}
dtrace:::END
{
this->elapsed = (timestamp - self->start) / 1000;
printf("Script duration: %d us\n", this->elapsed);
normalize(@types_cmd, 1000);
printf("\nExternal command elapsed times,\n");
printf(" %-30s %-22s %8s\n", "FILE", "NAME", "TIME(us)");
printa(" %-30s %-22s %@8d\n", @types_cmd);
normalize(@types_wasted, 1000);
printf("\nWasted command elapsed times,\n");
printf(" %-30s %-22s %8s\n", "FILE", "NAME", "TIME(us)");
printa(" %-30s %-22s %@8d\n", @types_wasted);
}
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