Date: Wed, 7 Jul 2010 17:26:27 +0200 From: Vikash Badal <Vikash.Badal@is.co.za> To: "freebsd-threads@freebsd.org" <freebsd-threads@freebsd.org> Subject: syslog strangeness on freebsd 8.0 and 8.1-RC when using threads Message-ID: <9B425C841283E0418B1825D40CBCFA613D9E525940@ZABRYSVISEXMBX1.af.didata.local>
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Can someone please assist me with some strangeness on FreeBSD 8.0 and 8.1=
-RC2
using a threaded test code code, I see the that freebsd 8.x seems to be u=
sing more memory when using the syslog() call from a c program:
Results:
7.2
without syslog
=20 PID USERNAME THR PRI NICE SIZE RES STATE TIME WCPU COMMA=
ND
26872 vikashb 1001 8 0 128M 14236K RUN 0:00 0.00% a.out
with syslog
=20 PID USERNAME THR PRI NICE SIZE RES STATE TIME WCPU COMMA=
ND
26881 vikashb 1001 44 0 128M 26236K RUN 0:00 0.00% a.out
8.0-RELEASE-p3
without syslog
=20 PID USERNAME THR PRI NICE SIZE RES STATE TIME WCPU COMMA=
ND
61529 vikashb 1001 44 0 129M 14840K RUN 0:01 0.00% a.out
with syslog
=20 PID USERNAME THR PRI NICE SIZE RES STATE TIME WCPU COMMA=
ND
61507 vikashb 1001 44 0 257M 42708K RUN 0:30 0.00% a.out
8.1-RC2
without syslog
=20 PID USERNAME THR PRI NICE SIZE RES STATE TIME WCPU COMMA=
ND
33062 vikashb 1001 44 0 129M 14804K RUN 0:00 0.00% a.out
with syslog
=20 PID USERNAME THR PRI NICE SIZE RES STATE TIME WCPU COMMA=
ND
33056 vikashb 1001 44 0 257M 42708K RUN 0:03 0.00% a.out
I have not been able to find any reasonable information via google.
Why does syslog result in more memory being consumed on 8.x as opposed to=
=207.2 ?
<CODE>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <stdarg.h>
#include <errno.h>
#include <syslog.h>
#include <signal.h>
#include <pthread.h>
char *ProgramName =3D "WTF";
int loop =3D 0;
int LogToSTDOUT =3D 1;
void LogMessage(int debug, const char *fmt,...)
{
=20 extern int LogToSTDOUT;
=20 char message[8192];
=20 memset(message, 0, sizeof(message));
=20 va_list args;
=20 va_start(args, fmt);
=20 vsnprintf(message, sizeof(message), fmt, args);
=20 va_end(args);
=20 if ( LogToSTDOUT )
=20 {
=20 printf("%s\n", message);
=20 }
=20 syslog(LOG_NOTICE, "%s", message);
}
unsigned long int getTimeNow()
{
=20 struct timeval tv;
=20 if ( gettimeofday(&tv, NULL) =3D=3D -1 )
=20 {
=20 LogMessage(0, "ERROR(%d) %s\n", errno, strerror(errno));
=20 tv.tv_sec =3D 0;
=20 }
=20 return tv.tv_sec;
}
void HandleSignal(int sig)
{
=20 loop =3D 0;
=20 LogMessage(0, "loop =3D %d\n", loop);
=20 signal(sig, SIG_IGN);
=20 usleep(1000);
}
void *worker(int n)
{
=20 while ( loop )
=20 {
=20 LogMessage(0, "worker #%d logging", n);
=20 usleep(1000);
=20 }
=20 pthread_exit(0);
}
int main(int argc, char* argv[])
{
=20 pthread_t* tpool;
=20 int workers =3D 1000, i, rc;
=20 openlog(ProgramName, LOG_PID, LOG_MAIL);
=20 unsigned long int duration =3D 120, StartTime, TimeNow;
=20 signal(SIGINT, HandleSignal);
=20 signal(SIGTERM, HandleSignal);
=20 signal(SIGHUP, HandleSignal);
=20 signal(SIGQUIT, HandleSignal);
=20 StartTime =3D getTimeNow();
=20 tpool =3D (pthread_t*)malloc(workers * sizeof(pthread_t));
=20 if ( tpool =3D=3D NULL )
=20 {
=20 LogMessage(0, "malloc failed \n");
=20 closelog();
=20 exit(-1);
=20 }
=20 memset(tpool, 0, sizeof(pthread_t) * workers);
=20 loop =3D 1;
=20 for ( i =3D 0; i < workers; i++ )
=20 {
=20 rc =3D pthread_create(&tpool[i], NULL, (void *(*)(void*))&worker,=
=20(void*)i);
=20 if ( rc !=3D 0 )
=20 {
=20 LogMessage(0, "pthread_create #%d failed\n", i );
=20 pthread_cancel(tpool[i]);
=20 }
=20 else
=20 {
=20 pthread_detach(tpool[i]);
=20 }
=20 }
=20 LogMessage(0, "loop =3D %d\n", loop);
=20 while ( loop )
=20 {
=20 TimeNow =3D getTimeNow();
=20 if ( ( TimeNow - StartTime ) > duration )
=20 {
=20 loop =3D 0;
=20 }
=20 usleep(1000);
=20 }
=20 for ( i =3D 0; i < workers; i++ )
=20 {
=20 pthread_cancel(tpool[i]);
=20 }
=20 for ( i =3D 0; i < workers; i++ )
=20 {
=20 pthread_join(tpool[i], NULL);
=20 }
=20 free(tpool);
=20 closelog();
=20 exit(0);
}
</CODE>
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