Section: TAU Instrumentation API (3)Updated: 08/31/2005Local indexUp
TAU_TRACK_MEMORY_HEADROOM - Track the headroom (amount of memory for a process to grow) by periodically interrupting the program
Tracks the amount of memory available for the process before it runs out of free memory on the heap. This call sets up a signal handler that is invoked every 10 seconds by an interrupt (this interval may be altered by using the
call). Inside the interrupt handler, TAU evaluates how much memory it can allocate and associates it with the callstack using the TAU context events (See
TAU_REGISTER_CONTEXT_EVENT(3)). The user can vary the size of the callstack by setting the environment variable
(default is 2). This call is useful on machines like IBM BG/L where no virtual memory (or paging using the swap space) is present. The amount of heap memory available to the program is limited by the amount of available physical memory. TAU executes a series of malloc calls with a granularity of 1MB and determines the amount of memory available for the program to grow.