Erlang Run-Time System Application (ERTS)

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ERTS Reference Manualerl set memory block (C Module)int realloc always moves If this flag is set to true (anything else than 0), all calls tosys realloc result in a moved memory block. This can in certain conditions giveless fragmentation. This flag may be removed in future releases.int use reclaim If this flag is set to true (anything else than 0), all memory allocatedwith sys alloc is automatically reclaimed as soon as a task exits. This is veryuseful to make writing port programs (and other programs as well) easier.Combine this with using the routines save open etc. specified in the reclaim.h filedelivered in the Erlang distribution.Return Value:Returns 0 (OK) on success, otherwise a value 0.intinterl memory show(...)Return Value:Returns 0 (OK) on success, otherwise a value 0.erl mem info get(MEM PART STATS *stats)Parameter:MEM PART STATS *stats A pointer to a MEM PART STATS structure as defined in. A successful call will fill in all fields of the structure, on error allfields are left untouched.Return Value:Returns 0 (OK) on success, otherwise a value 0NOTESThe memory block used by Erlang actually does not need to be inside the area known toordinary malloc. It is possible to set the USER RESERVED MEM preprocessor symbol whencompiling the wind kernel and then use user reserved memory for Erlang. Erlang cantherefor utilize memory above the 32 Mb limit of VxWorks on the PowerPCarchitecture.Example:In config.h for the wind kernel:#undef LOCAL_MEM_AUTOSIZE#undef LOCAL_MEM_SIZE#undef USER_RESERVED_MEM#define LOCAL_MEM_SIZE 0x05000000#define USER_RESERVED_MEM 0x03000000In the startup script/code for the VxWorks node:erl_set_memory_block(sysPhysMemTop()-sysMemTop(),sysMemTop(),0,0,1);Erlang Run-Time System Application (ERTS)25
Setting the use reclaim flag decreases performance of the system, but makesprogramming much easier. Other similar facilities are present in the Erlang system evenwithout using a separate memory block. The routines called save malloc,save realloc and save free provide the same facilities by using VxWorks ownmalloc. Similar routines exist for files, see the file reclaim.h in the distribution.26 Erlang Run-Time System Application (ERTS)
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Page 32 and 33: List of TablesChapter 1: ERTS User
Page 34: IndexModules are typed in this way.

Erlang Run-Time System Application (ERTS)

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