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/** Copyright (c) 2000 Jakob Borg
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
**
** $Id: cpu.cc,v 1.7 2001/11/03 14:40:36 jb Exp $
**/
#include <fstream>
#include <string>
#include <vector>
#include <assert.h>
using namespace std;
extern int HISTORY;
extern int NCPU;
/**
** Get CPU usage in % since last call.
** Slightly ugly.
**/
vector<int>* get_cpu_percent()
{
#ifdef OS_Linux
static int *tempcpu = new int[(NCPU+1)*4];
static int *oldcpu = new int[(NCPU+1)*4];
int cpu[(NCPU+1) * 4];
string foo;
static vector<int>* data = new vector<int>;
data->clear();
ifstream stat("/proc/stat");
for (int i = 0; i < ((NCPU > 1) ? NCPU + 1 : 1); i++)
stat >> foo >> tempcpu[i* 4 + 0] >> tempcpu[i* 4 + 1] >> tempcpu[i* 4 + 2] >> tempcpu[i* 4 + 3];
stat.close();
for (int i = (NCPU > 1) ? 1 : 0; i < ((NCPU > 1) ? NCPU + 1 : 1); i++) {
for (int j = 0; j < 4; j++) {
cpu[i* 4 + j] = tempcpu[i* 4 + j] - oldcpu[i* 4 + j];
oldcpu[i* 4 + j] = tempcpu[i* 4 + j];
}
}
for (int i = (NCPU > 1) ? 1 : 0; i < ((NCPU > 1) ? NCPU + 1 : 1); i++) {
int use = (cpu[i* 4 + 0] + cpu[i* 4 + 1] + cpu[i* 4 + 2]);
int total = (cpu[i* 4 + 0] + cpu[i* 4 + 1] + cpu[i* 4 + 2] + cpu[i* 4 + 3]);
if (total != 0) {
double p = use / total;
assert(p >= 0);
// HISTORY is also the granularity
data->push_back((int) (HISTORY * p));
} else
data->push_back(0);
}
return data;
#else
return 0;
#endif
}
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