printf issue

My target is AMD 386 using QNX Neutrino 6.3.2. My application entered in loop where it called printf(). I used “pidin in” to observe the memory consumption and i saw the system memory reduced consequently 4kbyte in short time. Does printf consume this memory?
Thanks so much,

If you look at system memory it could be other processes, or it could be the stack that is growing.