Function Entry: MEM

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Function Entry: MEM

Name

mem

Class

Function

Syntax

(mem)

Arguments and Values

None.

Description

Displays AutoLISP memory-usage statistics: garbage-collection counts and timings, dynamic-segment information (page size, used / free pages, largest contiguous free area, segment count), and per-type allocation (LISP stacks, bytecode area, CONS memory, strings, etc.). All heap memory is global; every AutoCAD document shares the same heap.

Return Values

Always returns nil. The statistics are written to the command line as a side effect.

Side Effects

Writes a multi-line memory report to the AutoCAD command line.

Examples

  • A typical (mem) invocation prints lines such as: 

    ; GC calls: 23; GC run time: 298 ms
Dynamic memory segments statistic:
PgSz  Used  Free  FMCL  Segs  Type
 512    79    48    48     1  lisp stacks
 256  3706   423   142    16  bytecode area
4096   320    10    10    22  CONS memory
 ...

Availability

  • AutoCAD 2026: documented.
  • BricsCAD V26: presumed compatible (the report content is implementation-defined).
  • Status: AutoCAD documented; BricsCAD presumed-both pending Phase 4 verification.