"too big" and "not enough memory" errors in shell script Post: 302285865

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Operating Systems AIX "too big" and "not enough memory" errors in shell script Post 302285865 by bakunin on Monday 9th of February 2009 11:20:45 PM

02-10-2009

Registered User

Quote:

Originally Posted by jerardfjay

Code:

svmon -G
               size      inuse       free        pin    virtual
memory      3670016    3411288     258728     222409     554969

Lets see: The output of "svmon" is in memory pages, which are 4k in AIX. The "size" and "inuse" values tell the physical memory and how of that is used. The machine has ~14GB memory installed (3.5 mio of 4k pages) and uses nearly all of it constantly. That the machine uses all of the physically installed memory is OK and to be expected.

The "virtual" column is the overall memory used by applications. The number is small compared to the number of installed memory and this means that the machine has enough memory for its day-to-day-operation. These figures are statistical in nature and this shows that your memory problems are short peaks of dramatically increased memory demand in a otherwise relatively idle machine.

The one java process you found is IMHO not the problem. If i interpret it correctly it is configured to use 256MB and this should be no big problem.

The output of "vmstat" shows nothing exceptional and the "lpstat" shows you have only 6GB of swap configured. This is a bit on the light side for 14GB of real memory, but otherwise only 1% of the swap is in use - it doesn't seem that you need more right now.

This leaves the question what goes wrong on your machine. You said you experience the problems only in very short timeframes. Start with searching the crontabs of all users you might find one (or several) troublemaker(s) which is (are) called only rarely. (I had such a situation once when a machine was experiencing a severe memory shortage with heavy paging activity every three days. We analyzed the situation and found out that a "mksysb" was responsible for the problem. We moved this mksysb-run to another time with less activity and the problem never happened again.)

I hope this helps.

bakunin

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tau_track_memory_headroom

TAU_TRACK_MEMORY_HEA(3) 				      TAU Instrumentation API					   TAU_TRACK_MEMORY_HEA(3)

NAME

       TAU_TRACK_MEMORY_HEADROOM - Track the headroom (amount of memory for a process to grow) by periodically interrupting the program

SYNOPSIS

       C/C++:

       TAU_TRACK_MEMORY_HEADROOM(void);

       Fortran:

       TAU_TRACK_MEMORY_HEADROOM(void);

DESCRIPTION

       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 TAU_SET_INTERRUPT_INTERVAL 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 TAU_CALLPATH_DEPTH (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.

EXAMPLE

       C/C++ :

       TAU_TRACK_MEMORY_HEADROOM();

       Fortran :

       call TAU_TRACK_MEMORY_HEADROOM()

SEE ALSO

       TAU_TRACK_MEMORY(3), TAU_SET_INTERRUPT_INTERVAL(3), TAU_ENABLE_TRACKING_MEMORY_HEADROOM(3), TAU_DISABLE_TRACKING_MEMORY_HEADROOM(3),
       TAU_TRACK_MEMORY_HEADROOM_HERE(3)

								    08/31/2005						   TAU_TRACK_MEMORY_HEA(3)