summaryrefslogtreecommitdiff
path: root/doc/man/scons-time.1
blob: f29ed545fe5ef8b70d85fa6447a52b1574539af9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
.\" Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 The SCons Foundation
.\"
.\" Permission is hereby granted, free of charge, to any person obtaining
.\" a copy of this software and associated documentation files (the
.\" "Software"), to deal in the Software without restriction, including
.\" without limitation the rights to use, copy, modify, merge, publish,
.\" distribute, sublicense, and/or sell copies of the Software, and to
.\" permit persons to whom the Software is furnished to do so, subject to
.\" the following conditions:
.\"
.\" The above copyright notice and this permission notice shall be included
.\" in all copies or substantial portions of the Software.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
.\" KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
.\" WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
.\" NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
.\" LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
.\" OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
.\" WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
.\"
.\" doc/man/scons-time.1  2013/03/03 09:48:35 garyo
.\"
.\" ES - Example Start - indents and turns off line fill
.de ES
.RS
.nf
..
.\" EE - Example End - ends indent and turns line fill back on
.de EE
.RE
.fi
..
'\"==========================================================================
.de SF
.B scons-time func
[\fB-h\fR]
[\fB--chdir=\fIDIR\fR]
[\fB-f \fIFILE\fR]
[\fB--fmt=\fIFORMAT\fR]
[\fB--func=\fINAME\fR]
[\fB-p \fISTRING\fR]
[\fB-t \fINUMBER\fR]
[\fB--title= TITLE\fR]
[\fIARGUMENTS\fR]
..
'\"--------------------------------------------------------------------------
.de SY
.B scons-time mem
[\fB-h\fR]
[\fB--chdir=\fIDIR\fR]
[\fB-f \fIFILE\fR]
[\fB--fmt=\fIFORMAT\fR]
[\fB-p \fISTRING\fR]
[\fB--stage=\fISTAGE\fR]
[\fB-t \fINUMBER\fR]
[\fB--title=\fITITLE\fR]
[\fIARGUMENTS\fR]
..
'\"--------------------------------------------------------------------------
.de SO
.B scons-time obj
[\fB-h\fR]
[\fB--chdir=\fIDIR\fR]
[\fB-f \fIFILE\fR]
[\fB--fmt=\fIFORMAT\fR]
[\fB-p \fISTRING\fR]
[\fB--stage=\fISTAGE\fR]
[\fB-t \fINUMBER\fR]
[\fB--title=\fITITLE\fR]
[\fIARGUMENTS\fR]
..
'\"--------------------------------------------------------------------------
.de SR
.B scons-time run
[\fB-hnqv\fR]
[\fB--aegis=\fIPROJECT\fR]
[\fB-f \fIFILE\fR]
[\fB--number=\fINUMBER\fR]
[\fB--outdir=\fIOUTDIR\fR]
[\fB-p \fISTRING\fR]
[\fB--python=\fIPYTHON\fR]
[\fB-s \fIDIR\fR]
[\fB--scons=\fISCONS\fR]
[\fB--svn=\fIURL\fR]
[\fIARGUMENTS\fR]
..
'\"--------------------------------------------------------------------------
.de ST
.B scons-time time
[\fB-h\fR]
[\fB--chdir=\fIDIR\fR]
[\fB-f \fIFILE\fR]
[\fB--fmt=\fIFORMAT\fR]
[\fB-p \fISTRING\fR]
[\fB-t \fINUMBER\fR]
[\fB--title=\fITITLE\fR]
[\fB--which=\fIWHICH\fR]
[\fIARGUMENTS\fR]
..
.TH SCONS-TIME 1 "March 2013"
.SH NAME
scons-time \- generate and display SCons timing information
'\"==========================================================================
.SH SYNOPSIS
.B scons-time
.IR subcommand
[
.IR options ...
]
[
.IR arguments ...
]
'\"--------------------------------------------------------------------------
.SS "Generating Timing Information"
.SR
'\"--------------------------------------------------------------------------
.SS "Extracting Function Timings"
.SF
'\"--------------------------------------------------------------------------
.SS "Extracting Memory Statistics"
.SY
'\"--------------------------------------------------------------------------
.SS "Extracting Object Counts"
.SO
'\"--------------------------------------------------------------------------
.SS "Extracting Execution Times"
.ST
'\"--------------------------------------------------------------------------
.SS "Help Text"
.B scons-time help
.I SUBCOMMAND
[...]
'\"==========================================================================
.SH DESCRIPTION
The 
.B scons-time
command runs an SCons configuration
through a standard set of profiled timings
and can extract and graph information from the
resulting profiles and log files of those timings.
The action to be performed by the
.B scons-time
script is specified
by a subcommand, the first argument on the command line.
See the
.B SUBCOMMANDS
section below for information about the operation
of specific subcommands.
.P
The basic way to use
.B scons-time
is to run the
.B scons-time run
subcommand
(possibly multiple times)
to generate profile and log file output,
and then use one of the other
subcommands to display the results
captured in the profiles and log files
for a particular kind of information:
function timings
(the
.B scons-time func
subcommand),
total memory used
(the
.B scons-time mem
subcommand),
object counts
(the
.B scons-time obj
subcommand)
and overall execution time
(the
.B scons-time time
subcommand).
Options exist to place and find the
profiles and log files in separate directories,
to generate the output in a format suitable
for graphing with the
.BR gnuplot (1)
program,
and so on.
.P
There are two basic ways the
.B scons-time run
subcommand
is intended to be used
to gather timing statistics
for a configuration.
One is to use the
.B --svn=
option to test a configuration against
a list of revisions from the SCons Subversion repository.
This will generate a profile and timing log file
for every revision listed with the
.B --number=
option,
and can be used to look at the
impact of commited changes to the
SCons code base on a particular
configuration over time.
.P
The other way is to profile incremental changes to a
local SCons code base during a development cycle--that is,
to look at the performance impact of changes
you're making in the local tree.
In this mode,
you run the
.B scons-time run
subcommand
.I without
the
.B --svn=
option,
in which case it simply looks in the profile/log file output directory
(the current directory by default)
and automatically figures out the
.I next
run number for the output profile and log file.
Used in this way,
the development cycle goes something like:
make a change to SCons;
run
.B scons-time run
to profile it against a specific configuration;
make another change to SCons;
run
.B scons-time run
again to profile it;
etc.
'\"==========================================================================
.SH OPTIONS
The
.B scons-time
command only supports a few global options:
.TP
-h, --help
Displays the global help text and exits,
identical to the
.B scons-time help
subcommand.
.TP
-V, --version
Displays the
.B scons-time
version and exits.
.P
Most functionality is controlled by options
to the individual subcommands.
See the next section for information
about individual subcommand options.
'\"==========================================================================
.SH SUBCOMMANDS
The
.B scons-time
command supports the following
individual subcommands.
'\"--------------------------------------------------------------------------
.SS "The func Subcommand"
.SF
.P
The
.B scons-time func
subcommand displays timing information
for a specific Python function within SCons.
By default, it extracts information about the
.BR _main ()
function,
which includes the Python profiler timing
for all of SCons.
.P
The
.B scons-time func
subcommand extracts function timing information
from all the specified file arguments,
which should be Python profiler output files.
(Normally, these would be
.B *.prof
files generated by the
.B scons-time run
subcommand,
but they can actually be generated
by any Python profiler invocation.)
All file name arguments will be
globbed for on-disk files.
.P
If no arguments are specified,
then function timing information
will be extracted from all
.B *.prof
files,
or the subset of them
with a prefix specified by the
.B -p
option.
.P
Options include:
.TP
-C DIRECTORY, --chdir=DIRECTORY
Changes to the specified
.I DIRECTORY
before looking for the specified files
(or files that match the specified patterns).
.TP
-f FILE, --file=FILE
Reads configuration information from the specified
.IR FILE .
.TP
-fmt=FORMAT, --format=FORMAT
Reports the output in the specified
.IR FORMAT .
The formats currently supported are
.B ascii
(the default)
and
.BR gnuplot .
.TP
--func=NAME
Extracts timings for the specified function
.IR NAME .
The default is to report cumulative timings for the
.BR _main ()
function,
which contains the entire SCons run.
.TP
-h, --help
Displays help text for the
.B scons-time func
subcommand.
.TP
-p STRING, --prefix=STRING
Specifies the prefix string for profiles
from which to extract function timing information.
This will be used to search for profiles
if no arguments are specified on the command line.
.TP
-t NUMBER, --tail=NUMBER
Only extracts function timings from the last
.I NUMBER
files.
'\"--------------------------------------------------------------------------
.SS "The help Subcommand"
.B scons-time help
.I SUBCOMMAND
[...]
The
.B help
subcommand prints help text for any
other subcommands listed as later arguments on the command line.
'\"--------------------------------------------------------------------------
.SS "The mem Subcommand"
.SY
.P
The
.B scons-time mem
subcommand displays how much memory SCons uses.
.P
The
.B scons-time mem
subcommand extracts memory use information
from all the specified file arguments,
which should be files containing output from
running SCons with the
.B --debug=memory
option.
(Normally, these would be
.B *.log
files generated by the
.B scons-time run
subcommand.)
All file name arguments will be
globbed for on-disk files.
.P
If no arguments are specified,
then memory information
will be extracted from all
.B *.log
files,
or the subset of them
with a prefix specified by the
.B -p
option.
.P
.TP
-C DIR, --chdir=DIR
Changes to the specified
.I DIRECTORY
before looking for the specified files
(or files that match the specified patterns).
.TP
-f FILE, --file=FILE
Reads configuration information from the specified
.IR FILE .
.TP
-fmt=FORMAT, --format=FORMAT
Reports the output in the specified
.IR FORMAT .
The formats currently supported are
.B ascii
(the default)
and
.BR gnuplot .
.TP
-h, --help
Displays help text for the
.B scons-time mem
subcommand.
.TP
-p STRING, --prefix=STRING
Specifies the prefix string for log files
from which to extract memory usage information.
This will be used to search for log files
if no arguments are specified on the command line.
.TP
--stage=STAGE
Prints the memory used at the end of the specified
.IR STAGE :
.B pre-read
(before the SConscript files are read),
.B post-read ,
(after the SConscript files are read),
.B pre-build
(before any targets are built)
or
.B post-build
(after any targets are built).
If no
.B --stage
option is specified,
the default behavior is
.BR post-build ,
which reports the final amount of memory
used by SCons during each run.
.TP
-t NUMBER, --tail=NUMBER
Only reports memory statistics from the last
.I NUMBER
files.
'\"--------------------------------------------------------------------------
.SS "The obj Subcommand"
.SO
.P
The
.B scons-time obj
subcommand displays how many objects of a specific named type
are created by SCons.
.P
The
.B scons-time obj
subcommand extracts object counts
from all the specified file arguments,
which should be files containing output from
running SCons with the
.B --debug=count
option.
(Normally, these would be
.B *.log
files generated by the
.B scons-time run
subcommand.)
All file name arguments will be
globbed for on-disk files.
.P
If no arguments are specified,
then object counts
will be extracted from all
.B *.log
files,
or the subset of them
with a prefix specified by the
.B -p
option.
.TP
-C DIR, --chdir=DIR
Changes to the specified
.I DIRECTORY
before looking for the specified files
(or files that match the specified patterns).
.TP
-f FILE, --file=FILE
Reads configuration information from the specified
.IR FILE .
.TP
-fmt=FORMAT, --format=FORMAT
Reports the output in the specified
.IR FORMAT .
The formats currently supported are
.B ascii
(the default)
and
.BR gnuplot .
.TP
-h, --help
Displays help text for the
.B scons-time obj
subcommand.
.TP
-p STRING, --prefix=STRING
Specifies the prefix string for log files
from which to extract object counts.
This will be used to search for log files
if no arguments are specified on the command line.
.TP
--stage=STAGE
Prints the object count at the end of the specified
.IR STAGE :
.B pre-read
(before the SConscript files are read),
.B post-read ,
(after the SConscript files are read),
.B pre-build
(before any targets are built)
or
.B post-build
(after any targets are built).
If no
.B --stage
option is specified,
the default behavior is
.BR post-build ,
which reports the final object count during each run.
.TP
-t NUMBER, --tail=NUMBER
Only reports object counts from the last
.I NUMBER
files.
'\"--------------------------------------------------------------------------
.SS "The run Subcommand"
.SR
The
.B scons-time run
subcommand is the basic subcommand
for profiling a specific configuration
against a version of SCons.
.P
The configuration to be tested
is specified as a list of files
or directories that will be unpacked or copied
into a temporary directory
in which SCons will be invoked.
The
.B scons-time run
subcommand understands file suffixes like
.BR .tar ,
.BR .tar.gz ,
.BR .tgz
and
.BR .zip
and will unpack their contents into a temporary directory.
If more than one argument is specified,
each one will be unpacked or copied
into the temporary directory "on top of"
the previous archives or directories,
so the expectation is that multiple
specified archives share the same directory layout.
.P
Once the file or directory arguments are unpacked or
copied to the temporary directory,
the
.B scons-time run
subcommand runs the
requested version of SCons
against the configuration
three times:
.TP
Startup
SCons is run with the
.B --help
option so that just the SConscript files are read,
and then the default help text is printed.
This profiles just the perceived "overhead" of starting up SCons
and processing the SConscript files.
.TP
Full build
SCons is run to build everything specified in the configuration.
Specific targets to be passed in on the command l ine
may be specified by the
.B targets
keyword in a configuration file; see below for details.
.TP
Rebuild
SCons is run again on the same just-built directory.
If the dependencies in the SCons configuration are correct,
this should be an up-to-date, "do nothing" rebuild.
.P
Each invocation captures the output log file and a profile.
.P
The
.B scons-time run
subcommand supports the following options:
.TP
--aegis=PROJECT
Specifies the Aegis
.I PROJECT
from which the
version(s) of
.B scons
being timed will be extracted.
When
.B --aegis
is specified, the
.BI --number= NUMBER
option specifies delta numbers
that will be tested.
Output from each invocation run will be placed in file
names that match the Aegis delta numbers.
If the
.B --number=
option is not specified,
then the default behavior is to time the
tip of the specified
.IR PROJECT .
.TP
-f FILE, --file=FILE
Reads configuration information from the specified
.IR FILE .
This often provides a more convenient way to specify and
collect parameters associated with a specific timing configuration
than specifying them on the command line.
See the
.B CONFIGURATION FILE
section below
for information about the configuration file parameters.
.TP
-h, --help
Displays help text for the
.B scons-time run
subcommand.
.TP
-n, --no-exec
Do not execute commands,
just printing the command-line equivalents of what would be executed.
Note that the
.B scons-time
script actually executes its actions in Python,
where possible,
for portability.
The commands displayed are UNIX
.I equivalents
of what it's doing.
.TP
--number=NUMBER
Specifies the run number to be used in the names of
the log files and profile outputs generated by this run.
.IP
When used in conjuction with the
.BI --aegis= PROJECT
option,
.I NUMBER
specifies one or more comma-separated Aegis delta numbers
that will be retrieved automatically from the specified Aegis
.IR PROJECT .
.IP
When used in conjuction with the
.BI --svn= URL
option,
.I NUMBER
specifies one or more comma-separated Subversion revision numbers
that will be retrieved automatically from the Subversion
repository at the specified
.IR URL .
Ranges of delta or revision numbers
may be specified be separating two numbers
with a hyphen
.RB ( \- ).
.P
Example:
.ES
% scons-time run --svn=http://scons.tigris.org/svn/trunk --num=1247,1249-1252 .
.EE
.TP
-p STRING, --prefix=STRING
Specifies the prefix string to be used for all of the log files
and profiles generated by this run.
The default is derived from the first
specified argument:
if the first argument is a directory,
the default prefix is the name of the directory;
if the first argument is an archive
(tar or zip file),
the default prefix is the the base name of the archive,
that is, what remains after stripping the archive suffix
.RB ( .tgz ", " .tar.gz " or " .zip ).
.TP
--python=PYTHON
Specifies a path to the Python executable to be used
for the timing runs.
The default is to use the same Python executable that
is running the
.B scons-time
command itself.
.TP
-q, --quiet
Suppresses display of the command lines being executed.
.TP
-s DIR, --subdir=DIR
Specifies the name of directory or subdirectory
from which the commands should be executed.
The default is XXX
.TP
--scons=SCONS
Specifies a path to the SCons script to be used
for the timing runs.
The default is XXX
.TP
--svn=URL, --subversion=URL
Specifies the
.I URL
of the Subversion repository from which the
version(s) of
.B scons
being timed will be extracted.
When
.B --svn
is specified, the
.BI --number= NUMBER
option specifies revision numbers
that will be tested.
Output from each invocation run will be placed in file
names that match the Subversion revision numbers.
If the
.B --number=
option is not specified,
then the default behavior is to time the
.B HEAD
of the specified
.IR URL .
.TP
-v, --verbose
Displays the output from individual commands to the screen
(in addition to capturing the output in log files).
'\"--------------------------------------------------------------------------
.SS "The time Subcommand"
.ST
.P
The
.B scons-time time
subcommand displays SCons execution times
as reported by the
.B scons --debug=time
option.
.P
The
.B scons-time time
subcommand extracts SCons timing
from all the specified file arguments,
which should be files containing output from
running SCons with the
.B --debug=time
option.
(Normally, these would be
.B *.log
files generated by the
.B scons-time run
subcommand.)
All file name arguments will be
globbed for on-disk files.
.P
If no arguments are specified,
then execution timings
will be extracted from all
.B *.log
files,
or the subset of them
with a prefix specified by the
.B -p
option.
.TP
-C DIR, --chdir=DIR
Changes to the specified
.I DIRECTORY
before looking for the specified files
(or files that match the specified patterns).
.TP
-f FILE, --file=FILE
Reads configuration information from the specified
.IR FILE .
.TP
-fmt=FORMAT, --format=FORMAT
Reports the output in the specified
.IR FORMAT .
The formats currently supported are
.B ascii
(the default)
and
.BR gnuplot .
.TP
-h, --help
Displays help text for the
.B scons-time time
subcommand.
.TP
-p STRING, --prefix=STRING
Specifies the prefix string for log files
from which to extract execution timings.
This will be used to search for log files
if no arguments are specified on the command line.
.TP
-t NUMBER, --tail=NUMBER
Only reports object counts from the last
.I NUMBER
files.
.TP
--which=WHICH
Prints the execution time for the specified
.IR WHICH
value:
.B total
(the total execution time),
.B SConscripts
(total execution time for the SConscript files themselves),
.B SCons
(exectuion time in SCons code itself)
or
.B commands
(execution time of the commands and other actions
used to build targets).
If no
.B --which
option is specified,
the default behavior is
.BR total ,
which reports the total execution time for each run.
'\"==========================================================================
.SH CONFIGURATION FILE
Various
.B scons-time
subcommands can read information from a specified
configuration file when passed the
.B \-f
or
.B \--file
options.
The configuration file is actually executed as a Python script.
Setting Python variables in the configuration file
controls the behavior of the
.B scons-time
script more conveniently than having to specify
command-line options or arguments for every run,
and provides a handy way to "shrink-wrap"
the necessary information for producing (and reporting)
consistent timing runs for a given configuration.
.TP
.B aegis
The Aegis executable for extracting deltas.
The default is simply
.BR aegis .
.TP
.B aegis_project
The Aegis project from which deltas should be extracted.
The default is whatever is specified
with the
.B --aegis=
command-line option.
.TP
.B archive_list
A list of archives (files or directories)
that will be copied to the temporary directory
in which SCons will be invoked.
.BR .tar ,
.BR .tar.gz ,
.BR .tgz
and
.BR .zip
files will have their contents unpacked in
the temporary directory.
Directory trees and files will be copied as-is.
.TP
.B initial_commands
A list of commands that will be executed
before the actual timed
.B scons
runs.
This can be used for commands that are necessary
to prepare the source tree\-for example,
creating a configuration file
that should not be part of the timed run.
.TP
.B key_location
The location of the key on Gnuplot graphing information
generated with the
.BR --format=gnuplot
option.
The default is
.BR "bottom left" .
.TP
.B prefix
The file name prefix to be used when
running or extracting timing for this configuration.
.TP
.B python
The path name of the Python executable
to be used when running or extracting information
for this configuration.
The default is the same version of Python
used to run the SCons
.TP
.B scons
The path name of the SCons script to be used
when running or extracting information
for this configuration.
The default is simply
.BR scons .
.TP
.B scons_flags
The
.B scons
flags used when running SCons to collect timing information.
The default value is
.BR "--debug=count --debug=memory --debug=time --debug=memoizer" .
.TP
.B scons_lib_dir
.TP
.B scons_wrapper
.TP
.B startup_targets
.TP
.B subdir
The subdirectory of the project into which the
.B scons-time
script should change
before executing the SCons commands to time.
.TP
.B subversion_url
The Subversion URL from
.TP
.B svn
The subversion executable used to
check out revisions of SCons to be timed.
The default is simple
.BR svn .
.TP
.B svn_co_flag
.TP
.B tar
.TP
.B targets
A string containing the targets that should be added to
the command line of every timed
.B scons
run.
This can be used to restrict what's being timed to a
subset of the full build for the configuration.
.TP
.B targets0
.TP
.B targets1
.TP
.B targets2
.TP
.B title
.TP
.B unzip
.TP
.B verbose
.TP
.B vertical_bars
'\"--------------------------------------------------------------------------
.SS Example
Here is an example
.B scons-time
configuration file
for a hypothetical sample project:
.P
.ES
# The project doesn't use SCons natively (yet), so we're
# timing a separate set of SConscript files that we lay
# on top of the vanilla unpacked project tarball.
arguments = ['project-1.2.tgz', 'project-SConscripts.tar']

# The subdirectory name contains the project version number,
# so tell scons-time to chdir there before building.
subdir = 'project-1.2'

# Set the prefix so output log files and profiles are named:
#     project-000-[012].{log,prof}
#     project-001-[012].{log,prof}
# etc.
prefix = 'project'

# The SConscript files being tested don't do any SConf
# configuration, so run their normal ./configure script
# before we invoke SCons.
initial_commands = [
    './configure',
]

# Only time building the bin/project executable.
targets = 'bin/project'

# Time against SCons revisions of the branches/core branch
subversion_url = 'http://scons.tigris.org/svn/scons/branches/core'
.EE
'\"==========================================================================
.SH ENVIRONMENT
The
.B scons-time
script uses the following environment variables:
.TP
.B PRESERVE
If this value is set,
the
.B scons-time
script will
.I not
remove the temporary directory or directories
in which it builds the specified configuration
or downloads a specific version of SCons.
'\"==========================================================================
.SH "SEE ALSO"
.BR gnuplot (1),
.BR scons (1)

.SH AUTHORS
Steven Knight <knight at baldmt dot com>