Article View: comp.lang.clos
Article #233Object representation overhead
From: David Kurlander
Date: Sat, 17 Nov 1990 19:50
Date: Sat, 17 Nov 1990 19:50
16 lines
1029 bytes
1029 bytes
A quick experiment with Lucid 4.0's version of CLOS reveals that simple-objects have an extra overhead of 20 bytes, while ordinary structures have an overhead of 12. What else tends to be stored in objects aside from a pointer to a dispatch table? (For that matter, why might structures have 12 bytes of overhead? A 4 byte tag indicating structure + 4 byte tag indicating structure type seems more than generous to me). David -- ---------------------------------- David Kurlander Department of Computer Science djk@cs.columbia.edu Columbia University
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arc1-ca.pugleaf.net!utzoo!utgpu!watserv1!watmath!att!att!linac!pacific.mps.ohio-state.edu!zaphod.mps.ohio-state.edu!usc!apple!sun-barr!rutgers!cunixf.cc.columbia.edu!cs.columbia.edu!djkShow Full Headers
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!watserv1!watmath!att!att!linac!pacific.mps.ohio-state.edu!zaphod.mps.ohio-state.edu!usc!apple!sun-barr!rutgers!cunixf.cc.columbia.edu!cs.columbia.edu!djk From: djk@cs.columbia.edu (David Kurlander) Newsgroups: comp.lang.clos Subject: Object representation overhead Message-ID: <1990Nov17.195029.27376@cs.columbia.edu> Date: 17 Nov 90 19:50:29 GMT Organization: Columbia University Department of Computer Science Lines: 16