FreeBSD-5.3/usr.bin/systat/iostat.c
/*
* Copyright (c) 1998 Kenneth D. Merry.
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*/
/*
* Copyright (c) 1980, 1992, 1993
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/usr.bin/systat/iostat.c,v 1.21 2003/11/01 02:06:02 tjr Exp $");
#ifdef lint
static const char sccsid[] = "@(#)iostat.c 8.1 (Berkeley) 6/6/93";
#endif
#include <sys/param.h>
#include <sys/sysctl.h>
#include <sys/resource.h>
#include <devstat.h>
#include <err.h>
#include <nlist.h>
#include <paths.h>
#include <stdlib.h>
#include <string.h>
#include "systat.h"
#include "extern.h"
#include "devs.h"
struct statinfo cur, last;
static int linesperregion;
static double etime;
static int numbers = 0; /* default display bar graphs */
static int kbpt = 0; /* default ms/seek shown */
static int barlabels(int);
static void histogram(long double, int, double);
static int numlabels(int);
static int devstats(int, int, int);
static void stat1(int, int);
WINDOW *
openiostat()
{
return (subwin(stdscr, LINES-1-5, 0, 5, 0));
}
void
closeiostat(w)
WINDOW *w;
{
if (w == NULL)
return;
wclear(w);
wrefresh(w);
delwin(w);
}
int
initiostat()
{
if ((num_devices = devstat_getnumdevs(NULL)) < 0)
return(0);
cur.dinfo = (struct devinfo *)malloc(sizeof(struct devinfo));
last.dinfo = (struct devinfo *)malloc(sizeof(struct devinfo));
bzero(cur.dinfo, sizeof(struct devinfo));
bzero(last.dinfo, sizeof(struct devinfo));
/*
* This value for maxshowdevs (100) is bogus. I'm not sure exactly
* how to calculate it, though.
*/
if (dsinit(100, &cur, &last, NULL) != 1)
return(0);
return(1);
}
void
fetchiostat()
{
struct devinfo *tmp_dinfo;
size_t len;
len = sizeof(cur.cp_time);
if (sysctlbyname("kern.cp_time", &cur.cp_time, &len, NULL, 0)
|| len != sizeof(cur.cp_time)) {
perror("kern.cp_time");
exit (1);
}
tmp_dinfo = last.dinfo;
last.dinfo = cur.dinfo;
cur.dinfo = tmp_dinfo;
last.snap_time = cur.snap_time;
/*
* Here what we want to do is refresh our device stats.
* getdevs() returns 1 when the device list has changed.
* If the device list has changed, we want to go through
* the selection process again, in case a device that we
* were previously displaying has gone away.
*/
switch (devstat_getdevs(NULL, &cur)) {
case -1:
errx(1, "%s", devstat_errbuf);
break;
case 1:
cmdiostat("refresh", NULL);
break;
default:
break;
}
num_devices = cur.dinfo->numdevs;
generation = cur.dinfo->generation;
}
#define INSET 10
void
labeliostat()
{
int row;
row = 0;
wmove(wnd, row, 0); wclrtobot(wnd);
mvwaddstr(wnd, row++, INSET,
"/0 /10 /20 /30 /40 /50 /60 /70 /80 /90 /100");
mvwaddstr(wnd, row++, 0, "cpu user|");
mvwaddstr(wnd, row++, 0, " nice|");
mvwaddstr(wnd, row++, 0, " system|");
mvwaddstr(wnd, row++, 0, "interrupt|");
mvwaddstr(wnd, row++, 0, " idle|");
if (numbers)
row = numlabels(row + 1);
else
row = barlabels(row + 1);
}
static int
numlabels(row)
int row;
{
int i, _col, regions, ndrives;
char tmpstr[10];
#define COLWIDTH 17
#define DRIVESPERLINE ((wnd->_maxx - INSET) / COLWIDTH)
for (ndrives = 0, i = 0; i < num_devices; i++)
if (dev_select[i].selected)
ndrives++;
regions = howmany(ndrives, DRIVESPERLINE);
/*
* Deduct -regions for blank line after each scrolling region.
*/
linesperregion = (wnd->_maxy - row - regions) / regions;
/*
* Minimum region contains space for two
* label lines and one line of statistics.
*/
if (linesperregion < 3)
linesperregion = 3;
_col = INSET;
for (i = 0; i < num_devices; i++)
if (dev_select[i].selected) {
if (_col + COLWIDTH >= wnd->_maxx - INSET) {
_col = INSET, row += linesperregion + 1;
if (row > wnd->_maxy - (linesperregion + 1))
break;
}
sprintf(tmpstr, "%s%d", dev_select[i].device_name,
dev_select[i].unit_number);
mvwaddstr(wnd, row, _col + 4, tmpstr);
mvwaddstr(wnd, row + 1, _col, " KB/t tps MB/s ");
_col += COLWIDTH;
}
if (_col)
row += linesperregion + 1;
return (row);
}
static int
barlabels(row)
int row;
{
int i;
char tmpstr[10];
mvwaddstr(wnd, row++, INSET,
"/0 /10 /20 /30 /40 /50 /60 /70 /80 /90 /100");
linesperregion = 2 + kbpt;
for (i = 0; i < num_devices; i++)
if (dev_select[i].selected) {
if (row > wnd->_maxy - linesperregion)
break;
sprintf(tmpstr, "%s%d", dev_select[i].device_name,
dev_select[i].unit_number);
mvwprintw(wnd, row++, 0, "%-5.5s MB/s|",
tmpstr);
mvwaddstr(wnd, row++, 0, " tps|");
if (kbpt)
mvwaddstr(wnd, row++, 0, " KB/t|");
}
return (row);
}
void
showiostat()
{
long t;
int i, row, _col;
#define X(fld) t = cur.fld[i]; cur.fld[i] -= last.fld[i]; last.fld[i] = t
etime = 0;
for(i = 0; i < CPUSTATES; i++) {
X(cp_time);
etime += cur.cp_time[i];
}
if (etime == 0.0)
etime = 1.0;
etime /= hertz;
row = 1;
for (i = 0; i < CPUSTATES; i++)
stat1(row++, i);
if (!numbers) {
row += 2;
for (i = 0; i < num_devices; i++)
if (dev_select[i].selected) {
if (row > wnd->_maxy - linesperregion)
break;
row = devstats(row, INSET, i);
}
return;
}
_col = INSET;
wmove(wnd, row + linesperregion, 0);
wdeleteln(wnd);
wmove(wnd, row + 3, 0);
winsertln(wnd);
for (i = 0; i < num_devices; i++)
if (dev_select[i].selected) {
if (_col + COLWIDTH >= wnd->_maxx - INSET) {
_col = INSET, row += linesperregion + 1;
if (row > wnd->_maxy - (linesperregion + 1))
break;
wmove(wnd, row + linesperregion, 0);
wdeleteln(wnd);
wmove(wnd, row + 3, 0);
winsertln(wnd);
}
(void) devstats(row + 3, _col, i);
_col += COLWIDTH;
}
}
static int
devstats(row, _col, dn)
int row, _col, dn;
{
long double transfers_per_second;
long double kb_per_transfer, mb_per_second;
long double busy_seconds;
int di;
di = dev_select[dn].position;
busy_seconds = cur.snap_time - last.snap_time;
if (devstat_compute_statistics(&cur.dinfo->devices[di],
&last.dinfo->devices[di], busy_seconds,
DSM_KB_PER_TRANSFER, &kb_per_transfer,
DSM_TRANSFERS_PER_SECOND, &transfers_per_second,
DSM_MB_PER_SECOND, &mb_per_second, DSM_NONE) != 0)
errx(1, "%s", devstat_errbuf);
if (numbers) {
mvwprintw(wnd, row, _col, " %5.2Lf %3.0Lf %5.2Lf ",
kb_per_transfer, transfers_per_second,
mb_per_second);
return(row);
}
wmove(wnd, row++, _col);
histogram(mb_per_second, 50, .5);
wmove(wnd, row++, _col);
histogram(transfers_per_second, 50, .5);
if (kbpt) {
wmove(wnd, row++, _col);
histogram(kb_per_transfer, 50, .5);
}
return(row);
}
static void
stat1(row, o)
int row, o;
{
int i;
double dtime;
dtime = 0.0;
for (i = 0; i < CPUSTATES; i++)
dtime += cur.cp_time[i];
if (dtime == 0.0)
dtime = 1.0;
wmove(wnd, row, INSET);
#define CPUSCALE 0.5
histogram(100.0 * cur.cp_time[o] / dtime, 50, CPUSCALE);
}
static void
histogram(val, colwidth, scale)
long double val;
int colwidth;
double scale;
{
char buf[10];
int k;
int v = (int)(val * scale) + 0.5;
k = MIN(v, colwidth);
if (v > colwidth) {
snprintf(buf, sizeof(buf), "%5.2Lf", val);
k -= strlen(buf);
while (k--)
waddch(wnd, 'X');
waddstr(wnd, buf);
return;
}
while (k--)
waddch(wnd, 'X');
wclrtoeol(wnd);
}
int
cmdiostat(cmd, args)
const char *cmd, *args;
{
if (prefix(cmd, "kbpt"))
kbpt = !kbpt;
else if (prefix(cmd, "numbers"))
numbers = 1;
else if (prefix(cmd, "bars"))
numbers = 0;
else if (!dscmd(cmd, args, 100, &cur))
return (0);
wclear(wnd);
labeliostat();
refresh();
return (1);
}