[m-rev.] diff: benchmarking minimal model overheads

Zoltan Somogyi zs at cs.mu.OZ.AU
Tue May 17 14:18:28 AEST 2005


Provide mechanisms for measuring individually the main sources of overheads
of minimal model tabling. This was required for the paper I have just finished
with Kostis.

runtime/mercury_stacks.h:
	Allow the inclusion of the extra nondet stack slot needed in
	minimal-model grades to be added even in non-minimal-model grades.

compiler/options.m:
	Add two new options, --disable-mm-pneg and --disable-mm-cut, that
	ask the code generator not to generate code for manipulating the pneg
	stack and the cut stack respectively. Add two new options for internal
	use by the compiler only, that say whether the compiler should emit
	code for handling the pneg stack and cut stack respectively. None of
	the options is documented, since they are not for users.

compiler/handle_options.m:
	Set the options to ask for the code for the pneg and cut stacks in
	minimal-model grades, unless the relevant disable option is given.

compiler/code_info.m:
compiler/ite_gen.m:
	Instead of testing the minimal model grade option to see whether to
	emit code for the cut stack and pneg stack respectively, test the
	relevant new option.

Zoltan.

cvs diff: Diffing .
cvs diff: Diffing analysis
cvs diff: Diffing bindist
cvs diff: Diffing boehm_gc
cvs diff: Diffing boehm_gc/Mac_files
cvs diff: Diffing boehm_gc/cord
cvs diff: Diffing boehm_gc/cord/private
cvs diff: Diffing boehm_gc/doc
cvs diff: Diffing boehm_gc/include
cvs diff: Diffing boehm_gc/include/private
cvs diff: Diffing boehm_gc/tests
cvs diff: Diffing browser
cvs diff: Diffing bytecode
cvs diff: Diffing compiler
Index: compiler/code_info.m
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/compiler/code_info.m,v
retrieving revision 1.297
diff -u -b -r1.297 code_info.m
--- compiler/code_info.m	24 Mar 2005 02:00:17 -0000	1.297
+++ compiler/code_info.m	5 May 2005 11:05:44 -0000
@@ -1836,12 +1836,12 @@
 			"prepare for temp frame commit", TempFrameCode, !CI),
 		code_info__get_globals(!.CI, Globals),
 		globals__lookup_bool_option(Globals,
-			use_minimal_model_stack_copy,
-			UseMinimalModelStackCopy),
+			use_minimal_model_stack_copy_cut,
+			UseMinimalModelStackCopyCut),
 		HijackInfo = commit_temp_frame(MaxfrSlot,
-			UseMinimalModelStackCopy),
+			UseMinimalModelStackCopyCut),
 		(
-			UseMinimalModelStackCopy = yes,
+			UseMinimalModelStackCopyCut = yes,
 			% If the code we are committing across starts but
 			% does not complete the evaluation of a tabled subgoal,
 			% the cut will remove the generator's choice point,
@@ -1868,7 +1868,7 @@
 					no, no, no, no, no, yes) - ""
 			])
 		;
-			UseMinimalModelStackCopy = no,
+			UseMinimalModelStackCopyCut = no,
 			MarkCode = empty
 		),
 		HijackCode = tree(MaxfrCode, tree(TempFrameCode, MarkCode))
Index: compiler/handle_options.m
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/compiler/handle_options.m,v
retrieving revision 1.228
diff -u -b -r1.228 handle_options.m
--- compiler/handle_options.m	7 Apr 2005 06:32:07 -0000	1.228
+++ compiler/handle_options.m	5 May 2005 11:45:46 -0000
@@ -1158,6 +1158,35 @@
 	% XXX we should allow hijacks in table_builtin.m
 	option_implies(use_minimal_model_stack_copy, allow_hijacks, bool(no)),
 
+	% Stack copy minimal model tabling needs to generate extra code
+	% at possibly negated contexts to handle the pneg stack and at commits
+	% to handle the cut stack. The code below allows the generation of
+	% these extra pieces of code to be disabled. The disabled program will
+	% work only if the program doesn't actually use minimal model tabling,
+	% which makes it useful only for performance testing.
+	globals__io_lookup_bool_option(disable_minimal_model_stack_copy_pneg,
+		DisablePneg),
+	globals__io_lookup_bool_option(disable_minimal_model_stack_copy_cut,
+		DisableCut),
+	(
+		{ UseMinimalModelStackCopy = yes },
+		{ DisablePneg = no }
+	->
+		globals__io_set_option(use_minimal_model_stack_copy_pneg,
+			bool(yes))
+	;
+		[]
+	),
+	(
+		{ UseMinimalModelStackCopy = yes },
+		{ DisableCut = no }
+	->
+		globals__io_set_option(use_minimal_model_stack_copy_cut,
+			bool(yes))
+	;
+		[]
+	),
+
 	% --dump-hlds and --statistics require compilation by phases
 	globals__io_lookup_accumulating_option(dump_hlds, DumpStages),
 	globals__io_lookup_bool_option(statistics, Statistics),
Index: compiler/ite_gen.m
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/compiler/ite_gen.m,v
retrieving revision 1.77
diff -u -b -r1.77 ite_gen.m
--- compiler/ite_gen.m	22 Mar 2005 06:40:02 -0000	1.77
+++ compiler/ite_gen.m	5 May 2005 11:05:44 -0000
@@ -410,10 +410,10 @@
 
 make_pneg_context_wrappers(Globals, PNegCondCode, PNegThenCode, PNegElseCode)
 		:-
-	globals__lookup_bool_option(Globals, use_minimal_model_stack_copy,
-		UseMinimalModelStackCopy),
+	globals__lookup_bool_option(Globals, use_minimal_model_stack_copy_pneg,
+		UseMinimalModelStackCopyPNeg),
 	(
-		UseMinimalModelStackCopy = yes,
+		UseMinimalModelStackCopyPNeg = yes,
 
 		PNegCondComponents = [
 			pragma_c_raw_code(
@@ -443,7 +443,7 @@
 				no, no, no, no, yes, yes) - ""
 		])
 	;
-		UseMinimalModelStackCopy = no,
+		UseMinimalModelStackCopyPNeg = no,
 		PNegCondCode = empty,
 		PNegThenCode = empty,
 		PNegElseCode = empty
Index: compiler/options.m
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/compiler/options.m,v
retrieving revision 1.457
diff -u -b -r1.457 options.m
--- compiler/options.m	27 Apr 2005 03:21:21 -0000	1.457
+++ compiler/options.m	5 May 2005 11:30:07 -0000
@@ -404,6 +404,12 @@
 				% only -- if you turn this off, then the
 				% debugger may dereference garbage pointers.
 		;	rtti_line_numbers
+				% These four are used to analyze the
+				% performance effects of minimal model tabling.
+		;	disable_minimal_model_stack_copy_pneg
+		;	disable_minimal_model_stack_copy_cut
+		;	use_minimal_model_stack_copy_pneg
+		;	use_minimal_model_stack_copy_cut
 	% Code generation options
 		;	low_level_debug
 		;	trad_passes
@@ -1044,7 +1050,11 @@
 	type_ctor_layout	-	bool(yes),
 	type_ctor_functors	-	bool(yes),
 	rtti_line_numbers	-	bool(yes),
-	new_type_class_rtti	-	bool(no)
+	new_type_class_rtti	-	bool(no),
+	disable_minimal_model_stack_copy_pneg - bool(no),
+	disable_minimal_model_stack_copy_cut - bool(no),
+	use_minimal_model_stack_copy_pneg - bool(no),
+	use_minimal_model_stack_copy_cut - bool(no)
 ]).
 option_defaults_2(code_gen_option, [
 		% Code Generation Options
@@ -1719,6 +1729,8 @@
 long_option("type-ctor-functors",	type_ctor_functors).
 long_option("new-type-class-rtti",	new_type_class_rtti).
 long_option("rtti-line-numbers",	rtti_line_numbers).
+long_option("disable-mm-pneg",		disable_minimal_model_stack_copy_pneg).
+long_option("disable-mm-cut",		disable_minimal_model_stack_copy_cut).
 
 % code generation options
 long_option("low-level-debug",		low_level_debug).
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Index: runtime/mercury_stacks.h
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/runtime/mercury_stacks.h,v
retrieving revision 1.49
diff -u -b -r1.49 mercury_stacks.h
--- runtime/mercury_stacks.h	20 Jul 2004 04:41:24 -0000	1.49
+++ runtime/mercury_stacks.h	5 May 2005 11:10:38 -0000
@@ -126,6 +126,16 @@
 #define	MR_TABLE_DETFR	(-5)	/* sp, in minimal model main frames only */
 
 /*
+** This setup allows MR_USE_MINIMAL_MODEL_STACK_COPY_EXTRA_SLOT to be defined
+** even if MR_USE_MINIMAL_MODEL_STACK_COPY isn't, which can be useful for
+** performance testing.
+*/
+
+#ifdef	MR_USE_MINIMAL_MODEL_STACK_COPY
+  #define MR_USE_MINIMAL_MODEL_STACK_COPY_EXTRA_SLOT
+#endif
+
+/*
 ** MR_Code that traverses the nondet stack depends on the relationship
 ** MR_NONDET_TEMP_SIZE < MR_DET_TEMP_SIZE < MR_NONDET_FIXED_SIZE.
 ** All three sizes are measured in words.
@@ -133,7 +143,7 @@
 
 #define	MR_NONDET_TEMP_SIZE	3 /* prevfr, redoip, redofr */
 #define	MR_DET_TEMP_SIZE	4 /* prevfr, redoip, redofr, detfr */
-#ifdef	MR_USE_MINIMAL_MODEL_STACK_COPY
+#ifdef	MR_USE_MINIMAL_MODEL_STACK_COPY_EXTRA_SLOT
 #define	MR_NONDET_FIXED_SIZE	6 /* prevfr, redoip, redofr, succip, succfr,
 				     sp */
 #else
@@ -179,7 +189,7 @@
 
 /* DEFINITIONS FOR MANIPULATING THE NONDET STACK */
 
-#ifdef	MR_USE_MINIMAL_MODEL_STACK_COPY
+#ifdef	MR_USE_MINIMAL_MODEL_STACK_COPY_EXTRA_SLOT
   #define	MR_maybe_fill_table_detfr_slot()			\
 			do {						\
 				MR_table_detfr_slot_word(MR_curfr) =	\
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