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/*
Copyright (C) 2006 Renaissance Technologies Corp.
main developer: HP Wei <hp@rentec.com>
Copyright (C) 2005 Renaissance Technologies Corp.
main developer: HP Wei <hp@rentec.com>
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, 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; see the file COPYING.
If not, write to the Free Software Foundation,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <sys/time.h>
#include <stdio.h>
#define N 501 /* effectively set the maximum time in rtt_hist to be 500 msec */
extern int verbose;
/* for timing */
struct timeval tv0, tv1;
unsigned long usec_acc, sec_acc; /* accumulator of timing */
unsigned int rtt_hist[N]; /* rtt_hist[i] = count of rtt within (i, i+1) */
void refresh_timer()
{
usec_acc = 0;
sec_acc = 0;
}
void start_timer()
{
struct timezone tz;
gettimeofday(&tv0, &tz);
}
void end_timer()
{
struct timezone tz;
gettimeofday(&tv1, &tz); /* end timer -------- */
}
void update_time_accumulator()
{
if (tv1.tv_usec<tv0.tv_usec) {
sec_acc += (tv1.tv_sec - tv0.tv_sec - 1);
usec_acc += (1000000 + tv1.tv_usec - tv0.tv_usec);
} else {
sec_acc += (tv1.tv_sec - tv0.tv_sec);
usec_acc += (tv1.tv_usec - tv0.tv_usec);
}
}
double get_accumulated_time()
{
double sec = sec_acc;
sec += (usec_acc / 1e6);
return sec;
}
double get_accumulated_usec()
{
double usec = usec_acc;
usec += (sec_acc*1e6);
return usec;
}
void init_rtt_hist()
{
int i;
for(i=0; i<N; ++i) rtt_hist[i] = 0;
}
void update_rtt_hist(unsigned int rtt)
{
unsigned int index;
index = rtt / 1000;
if (index>(N-2)) index = N-1;
rtt_hist[index]++;
}
void pr_rtt_hist()
{
int i;
fprintf(stderr, "rtt histogram\n");
fprintf(stderr, "msec counts\n");
fprintf(stderr, "---- --------\n");
for(i=0; i<N; ++i) {
if (verbose<=1 && i>10) continue;
if (rtt_hist[i] != 0) {
fprintf(stderr, "%4d %u\n", i, rtt_hist[i]);
}
}
}
unsigned int pages_wo_ack()
{
return rtt_hist[N-1];
}
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