Folks,

I have written an application using gcc-3.2.2.
It uses lots of arrays with reasonable large sizes(10-4096) for different "structure"s and ncurses. It also has 9-threads running in an infinite loop.

After I run my program, I open another shell and run "top" and check the numbers. The load avreage is just fine, near 0.0 most of the time. However, RSS and SIZE values are keep increasing every 10seconds or so. Say, they starts from 3MB, then becomes 12MB in 10 seconds, or become 201M in 6 hours at the same situation(idle) of the program. I don't do anything further or open any drop-down windows in the program. Just sits and runs in the memory.

I use kernel 2.4 on an P200 PC.

Can someone give me a hand to cause of the increasing memory usage, please?

Appreciate it.

Most likely there is memory leakage in your program.
You keep creating objects without releasing old ones.
Keep track of the un-destroyed un-referenced objects in your program.

You are are right. That was the case. It has a thread running in an indefinite loop, which calls mysql routines below.

//program starts
..
MYSQL *mysqlconnect(void) {
const char *s;
MYSQL *mysql;

if((mysql=mysql_init(NULL))==NULL) return NULL;
if((mysql_real_connect(mysql, DBHOST, DBUSER, DBPW, DBDB, 0, NULL, 0))==NULL) {
s=mysql_error(mysql);
report(SYSLOG, (char *) s, error_code_predescribed);
mysql_close(mysql);
return NULL;
}
else return (mysql);
}
..

//thread procedure starts
MYSQL mysql;
..
while(1) {
if((mysql=mysqlconnect)!=NULL) {
do some database operations;
}
else sleep(5);
} //while
..
//thread ends


Main {
..
}
//program ends

Because mysql pointer never gets freed it always creates a new one for each loop in thread procedure.
I copied mysqlconnect procedure content into the thread, and localize it. Then, it solved the problem.
However, I need to search some other solutions. Because I call mysqconnect almost in every procedure.

Thank you so much for your great advise.