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e63124bc MW |
1 | /* -*-c-*- |
2 | * | |
3 | * Benchmarking in the test-vector framework | |
4 | * | |
5 | * (c) 2023 Straylight/Edgeware | |
6 | */ | |
7 | ||
8 | /*----- Licensing notice --------------------------------------------------* | |
9 | * | |
10 | * This file is part of the mLib utilities library. | |
11 | * | |
12 | * mLib is free software: you can redistribute it and/or modify it under | |
13 | * the terms of the GNU Library General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or (at | |
15 | * your option) any later version. | |
16 | * | |
17 | * mLib is distributed in the hope that it will be useful, but WITHOUT | |
18 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
19 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public | |
20 | * License for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU Library General Public | |
23 | * License along with mLib. If not, write to the Free Software | |
24 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, | |
25 | * USA. | |
26 | */ | |
27 | ||
28 | /*----- Header files ------------------------------------------------------*/ | |
29 | ||
30 | #include "bench.h" | |
31 | #include "tvec.h" | |
32 | ||
33 | /*----- Data structures ---------------------------------------------------*/ | |
34 | ||
35 | struct benchrun { | |
67b5031e MW |
36 | struct tvec_state *tv; /* test vector state */ |
37 | const struct tvec_env *env; /* subordinate environment */ | |
38 | void *ctx; /* subordinate env's context */ | |
39 | unsigned long *n; /* iteration count address */ | |
40 | const struct tvec_reg *in; struct tvec_reg *out; /* register vectors */ | |
41 | tvec_testfn *fn; /* test function to run */ | |
e63124bc MW |
42 | }; |
43 | ||
44 | /*----- Global variables --------------------------------------------------*/ | |
45 | ||
67b5031e | 46 | struct bench_state *tvec_benchstate; /* common benchmarking state */ |
e63124bc | 47 | |
67b5031e MW |
48 | /*----- Utilities ---------------------------------------------------------*/ |
49 | ||
50 | /* --- @normalize@ --- * | |
51 | * | |
52 | * Arguments: @double *x_inout@ = address of a value to normalize | |
53 | * @const char **unit_out@ = address to store unit prefix | |
54 | * @double scale@ = scale factor for unit steps | |
55 | * | |
56 | * Returns: --- | |
57 | * | |
58 | * Use: Adjust @*x_inout@ by a power of @scale@, and set @*unit_out@ | |
59 | * so that printing the two reflects the original value with an | |
60 | * appropriate SI unit scaling. The @scale@ should be 1024 for | |
61 | * binary quantities, most notably memory sizes, or 1000 for | |
62 | * other quantities. | |
63 | */ | |
e63124bc MW |
64 | |
65 | static void normalize(double *x_inout, const char **unit_out, double scale) | |
66 | { | |
67 | static const char | |
68 | *const nothing = "", | |
69 | *const big[] = { "k", "M", "G", "T", "P", "E", 0 }, | |
70 | *const little[] = { "m", "ยต", "n", "p", "f", "a", 0 }; | |
71 | const char *const *u; | |
72 | double x = *x_inout; | |
73 | ||
74 | if (x < 1) | |
75 | for (u = little, x *= scale; x < 1 && u[1]; u++, x *= scale); | |
76 | else if (x >= scale) | |
77 | for (u = big, x /= scale; x >= scale && u[1]; u++, x /= scale); | |
78 | else | |
79 | u = ¬hing; | |
80 | ||
81 | *x_inout = x; *unit_out = *u; | |
82 | } | |
83 | ||
c81c35df MW |
84 | /* --- @benchloop_...@ --- * |
85 | * | |
86 | * Arguments: @unsigned long n@ = iteration count | |
87 | * @void *ctx@ = benchmark running context | |
88 | * | |
89 | * Returns: --- | |
90 | * | |
91 | * Use: Run various kinds of benchmarking loops. | |
92 | * | |
93 | * * The @..._outer_...@ functions call the underlying | |
94 | * function @n@ times in a loop; by contrast, the | |
95 | * @..._inner_...@ functions set a register value to the | |
96 | * chosen iteration count and expect the underlying function | |
97 | * to perform the loop itself. | |
98 | * | |
99 | * * The @..._direct@ functions just call the underlying test | |
100 | * function directly (though still through an `indirect | |
101 | * jump' instruction); by contrast, the @..._indirect@ | |
102 | * functions invoke a subsidiary environment's @run@ | |
103 | * function, which adds additional overhead. | |
104 | */ | |
105 | ||
106 | static void benchloop_outer_direct(unsigned long n, void *ctx) | |
107 | { | |
108 | struct benchrun *r = ctx; | |
109 | tvec_testfn *fn = r->fn; void *tctx = r->ctx; | |
110 | const struct tvec_reg *in = r->in; struct tvec_reg *out = r->out; | |
111 | ||
112 | while (n--) fn(in, out, tctx); | |
113 | } | |
114 | ||
115 | static void benchloop_inner_direct(unsigned long n, void *ctx) | |
116 | { struct benchrun *r = ctx; *r->n = n; r->fn(r->in, r->out, r->ctx); } | |
117 | ||
118 | static void benchloop_outer_indirect(unsigned long n, void *ctx) | |
119 | { | |
120 | struct benchrun *r = ctx; | |
121 | struct tvec_state *tv = r->tv; | |
122 | void (*run)(struct tvec_state *, tvec_testfn, void *) = r->env->run; | |
123 | tvec_testfn *fn = r->fn; void *tctx = r->ctx; | |
124 | ||
125 | while (n--) run(tv, fn, tctx); | |
126 | } | |
127 | ||
128 | static void benchloop_inner_indirect(unsigned long n, void *ctx) | |
129 | { struct benchrun *r = ctx; *r->n = n; r->env->run(r->tv, r->fn, r->ctx); } | |
130 | ||
131 | /*----- Output utilities --------------------------------------------------*/ | |
132 | ||
133 | /* --- @tvec_benchreport@ --- * | |
134 | * | |
135 | * Arguments: @const struct gprintf_ops *gops@ = print operations | |
136 | * @void *go@ = print destination | |
137 | * @unsigned unit@ = the unit being measured (~TVBU_...@) | |
138 | * @const struct bench_timing *tm@ = the benchmark result | |
139 | * | |
140 | * Returns: --- | |
141 | * | |
142 | * Use: Formats a report about the benchmark performance. This | |
143 | * function is intended to be called on by an output | |
144 | * @ebench@ function. | |
145 | */ | |
146 | ||
147 | void tvec_benchreport(const struct gprintf_ops *gops, void *go, | |
148 | unsigned unit, const struct bench_timing *tm) | |
149 | { | |
150 | double scale, x, n = tm->n; | |
151 | const char *u, *what, *whats; | |
152 | ||
153 | if (!tm) { gprintf(gops, go, "benchmark FAILED"); return; } | |
154 | ||
155 | assert(tm->f&BTF_TIMEOK); | |
156 | ||
157 | switch (unit) { | |
158 | case TVBU_OP: | |
159 | gprintf(gops, go, "%.0f iterations ", n); | |
160 | what = "op"; whats = "ops"; scale = 1000; | |
161 | break; | |
162 | case TVBU_BYTE: | |
163 | x = n; normalize(&x, &u, 1024); gprintf(gops, go, "%.3f %sB ", x, u); | |
164 | what = whats = "B"; scale = 1024; | |
165 | break; | |
166 | default: | |
167 | abort(); | |
168 | } | |
169 | ||
170 | x = tm->t; normalize(&x, &u, 1000); | |
171 | gprintf(gops, go, "in %.3f %ss", x, u); | |
172 | if (tm->f&BTF_CYOK) { | |
173 | x = tm->cy; normalize(&x, &u, 1000); | |
174 | gprintf(gops, go, " (%.3f %scy)", x, u); | |
175 | } | |
176 | gprintf(gops, go, ": "); | |
177 | ||
178 | x = n/tm->t; normalize(&x, &u, scale); | |
179 | gprintf(gops, go, "%.3f %s%s/s", x, u, whats); | |
180 | x = tm->t/n; normalize(&x, &u, 1000); | |
181 | gprintf(gops, go, ", %.3f %ss/%s", x, u, what); | |
182 | if (tm->f&BTF_CYOK) { | |
183 | x = tm->cy/n; normalize(&x, &u, 1000); | |
184 | gprintf(gops, go, " (%.3f %scy/%s)", x, u, what); | |
185 | } | |
186 | } | |
187 | ||
67b5031e MW |
188 | /*----- Benchmark environment scaffolding ---------------------------------*/ |
189 | ||
190 | /* --- @tvec_benchsetup@ --- * | |
191 | * | |
192 | * Arguments: @struct tvec_state *tv@ = test vector state | |
193 | * @const struct tvec_env *env@ = environment description | |
194 | * @void *pctx@ = parent context (ignored) | |
195 | * @void *ctx@ = context pointer to initialize | |
196 | * | |
c91413e6 | 197 | * Returns: --- |
67b5031e MW |
198 | * |
199 | * Use: Initialize a benchmarking environment context. | |
200 | * | |
201 | * The environment description must really be a @struct | |
c91413e6 | 202 | * tvec_benchenv@. If the @bst@ slot is null, then a temporary |
67b5031e MW |
203 | * benchmark state is allocated for the current test group and |
204 | * released at the end. Otherwise, it must be the address of a | |
205 | * pointer to a benchmark state: if the pointer is null, then a | |
206 | * fresh state is allocated and initialized and the pointer is | |
207 | * updated; otherwise, the pointer is assumed to refer to an | |
208 | * existing valid benchmark state. | |
209 | */ | |
210 | ||
c91413e6 MW |
211 | void tvec_benchsetup(struct tvec_state *tv, const struct tvec_env *env, |
212 | void *pctx, void *ctx) | |
e63124bc MW |
213 | { |
214 | struct tvec_benchctx *bc = ctx; | |
c91413e6 MW |
215 | const struct tvec_benchenv *be = (const struct tvec_benchenv *)env; |
216 | const struct tvec_env *subenv = be->env; | |
e63124bc MW |
217 | struct bench_timer *bt; |
218 | ||
67b5031e | 219 | /* Basic initialization. */ |
c91413e6 | 220 | bc->be = be; bc->bst = 0; bc->subctx = 0; |
e63124bc | 221 | |
67b5031e | 222 | /* Set up the benchmarking state if it hasn't been done before. */ |
c91413e6 | 223 | if (!be->bst || !*be->bst) { |
e63124bc MW |
224 | bt = bench_createtimer(); if (!bt) goto fail_timer; |
225 | bc->bst = xmalloc(sizeof(*bc->bst)); bench_init(bc->bst, bt); | |
c91413e6 MW |
226 | if (be->bst) *be->bst = bc->bst; |
227 | } else if (!(*be->bst)->tm) | |
e63124bc MW |
228 | goto fail_timer; |
229 | else | |
c91413e6 | 230 | bc->bst = *be->bst; |
67b5031e MW |
231 | |
232 | /* Set the default target time. */ | |
e63124bc MW |
233 | bc->dflt_target = bc->bst->target_s; |
234 | ||
67b5031e | 235 | /* Initialize the subordinate environment. */ |
e63124bc | 236 | if (subenv && subenv->ctxsz) bc->subctx = xmalloc(subenv->ctxsz); |
c91413e6 | 237 | if (subenv && subenv->setup) subenv->setup(tv, subenv, bc, bc->subctx); |
e63124bc | 238 | |
67b5031e | 239 | /* All done. */ |
e63124bc | 240 | end: |
c91413e6 | 241 | return; |
e63124bc MW |
242 | fail_timer: |
243 | tvec_skipgroup(tv, "failed to create timer"); goto end; | |
244 | } | |
245 | ||
67b5031e MW |
246 | /* --- @tvec_benchset@ --- * |
247 | * | |
248 | * Arguments: @struct tvec_state *tv@ = test vector state | |
249 | * @const char *var@ = variable name to set | |
67b5031e MW |
250 | * @void *ctx@ = context pointer |
251 | * | |
c81c35df MW |
252 | * Returns: %$+1$% on success, %$0$% if the variable name was not |
253 | * recognized, or %$-1$% on any other error. | |
67b5031e MW |
254 | * |
255 | * Use: Set a special variable. The following special variables are | |
256 | * supported. | |
257 | * | |
258 | * * %|@target|% is the (approximate) number of seconds to run | |
259 | * the benchmark. | |
260 | * | |
261 | * Unrecognized variables are passed to the subordinate | |
262 | * environment, if there is one. | |
263 | */ | |
264 | ||
31d0247c | 265 | int tvec_benchset(struct tvec_state *tv, const char *var, void *ctx) |
e63124bc MW |
266 | { |
267 | struct tvec_benchctx *bc = ctx; | |
31d0247c | 268 | const struct tvec_benchenv *be = bc->be; |
c91413e6 | 269 | const struct tvec_env *subenv = be->env; |
e63124bc MW |
270 | union tvec_regval rv; |
271 | static const struct tvec_floatinfo fi = { TVFF_NOMAX, 0.0, 0.0, 0.0 }; | |
272 | static const struct tvec_regdef rd = | |
273 | { "@target", -1, &tvty_float, 0, { &fi } }; | |
274 | ||
275 | if (STRCMP(var, ==, "@target")) { | |
31d0247c | 276 | if (bc->f&TVBF_SETTRG) return (tvec_dupreg(tv, var)); |
e63124bc | 277 | if (tvty_float.parse(&rv, &rd, tv)) return (-1); |
31d0247c | 278 | bc->bst->target_s = rv.f; bc->f |= TVBF_SETTRG; return (1); |
e63124bc | 279 | } else if (subenv && subenv->set) |
31d0247c | 280 | return (subenv->set(tv, var, bc->subctx)); |
e63124bc MW |
281 | else |
282 | return (0); | |
283 | } | |
284 | ||
67b5031e MW |
285 | /* --- @tvec_benchbefore@ --- * |
286 | * | |
287 | * Arguments: @struct tvec_state *tv@ = test vector state | |
288 | * @void *ctx@ = context pointer | |
289 | * | |
c91413e6 | 290 | * Returns: --- |
67b5031e MW |
291 | * |
292 | * Use: Invoke the subordinate environment's @before@ function to | |
293 | * prepare for the benchmark. | |
294 | */ | |
295 | ||
c91413e6 | 296 | void tvec_benchbefore(struct tvec_state *tv, void *ctx) |
e63124bc MW |
297 | { |
298 | struct tvec_benchctx *bc = ctx; | |
c91413e6 MW |
299 | const struct tvec_benchenv *be = bc->be; |
300 | const struct tvec_env *subenv = be->env; | |
e63124bc | 301 | |
67b5031e | 302 | /* Just call the subsidiary environment. */ |
c91413e6 | 303 | if (subenv && subenv->before) subenv->before(tv, bc->subctx); |
e63124bc MW |
304 | } |
305 | ||
67b5031e MW |
306 | /* --- @tvec_benchrun@ --- * |
307 | * | |
308 | * Arguments: @struct tvec_state *tv@ = test vector state | |
309 | * @tvec_testfn *fn@ = test function to run | |
310 | * @void *ctx@ = context pointer for the test function | |
311 | * | |
312 | * Returns: --- | |
313 | * | |
314 | * Use: Measures and reports the performance of a test function. | |
67b5031e | 315 | */ |
e63124bc MW |
316 | |
317 | void tvec_benchrun(struct tvec_state *tv, tvec_testfn *fn, void *ctx) | |
318 | { | |
319 | struct tvec_benchctx *bc = ctx; | |
c91413e6 MW |
320 | const struct tvec_benchenv *be = bc->be; |
321 | const struct tvec_env *subenv = be->env; | |
e63124bc MW |
322 | const struct tvec_regdef *rd; |
323 | struct tvec_output *o = tv->output; | |
324 | struct bench_timing tm; | |
325 | struct benchrun r; | |
326 | bench_fn *loopfn; | |
327 | unsigned unit; | |
328 | dstr d = DSTR_INIT; | |
329 | double base; | |
330 | unsigned f = 0; | |
331 | #define f_any 1u | |
332 | ||
67b5031e | 333 | /* Fill in the easy parts of the run context. */ |
e63124bc MW |
334 | r.tv = tv; r.env = subenv; r.ctx = bc->subctx; |
335 | r.in = tv->in; r.out = tv->out; r.fn = fn; | |
336 | ||
67b5031e | 337 | /* Decide on the run function to select. */ |
c91413e6 MW |
338 | if (be->riter >= 0) { |
339 | r.n = &TVEC_REG(tv, in, be->riter)->v.u; | |
e63124bc MW |
340 | loopfn = subenv && subenv->run ? |
341 | benchloop_inner_indirect : benchloop_inner_direct; | |
342 | } else { | |
343 | r.n = 0; | |
344 | loopfn = subenv && subenv->run ? | |
345 | benchloop_outer_indirect : benchloop_outer_direct; | |
346 | } | |
347 | ||
67b5031e | 348 | /* Decide on the kind of unit and the base count. */ |
c91413e6 MW |
349 | base = be->niter; |
350 | if (be->rbuf < 0) unit = TVBU_OP; | |
351 | else { unit = TVBU_BYTE; base *= TVEC_REG(tv, in, be->rbuf)->v.bytes.sz; } | |
e63124bc | 352 | |
67b5031e | 353 | /* Construct a description of the test using the identifier registers. */ |
e63124bc MW |
354 | for (rd = tv->test->regs; rd->name; rd++) |
355 | if (rd->f&TVRF_ID) { | |
356 | if (f&f_any) dstr_puts(&d, ", "); | |
357 | else f |= f_any; | |
358 | dstr_putf(&d, "%s = ", rd->name); | |
359 | rd->ty->dump(&TVEC_REG(tv, in, rd->i)->v, rd, | |
360 | TVSF_COMPACT, &dstr_printops, &d); | |
361 | } | |
362 | ||
67b5031e | 363 | /* Run the benchmark. */ |
e63124bc MW |
364 | o->ops->bbench(o, d.buf, unit); |
365 | if (bench_measure(&tm, bc->bst, base, loopfn, &r)) | |
366 | o->ops->ebench(o, d.buf, unit, 0); | |
367 | else | |
368 | o->ops->ebench(o, d.buf, unit, &tm); | |
369 | ||
370 | dstr_destroy(&d); | |
371 | ||
372 | #undef f_any | |
373 | } | |
374 | ||
c81c35df | 375 | /* --- @tvec_benchafter@ --- * |
67b5031e | 376 | * |
c81c35df MW |
377 | * Arguments: @struct tvec_state *tv@ = test vector state |
378 | * @void *ctx@ = context pointer | |
67b5031e MW |
379 | * |
380 | * Returns: --- | |
381 | * | |
c81c35df MW |
382 | * Use: Invoke the subordinate environment's @after@ function to |
383 | * clean up after the benchmark. | |
67b5031e MW |
384 | */ |
385 | ||
c81c35df | 386 | void tvec_benchafter(struct tvec_state *tv, void *ctx) |
e63124bc | 387 | { |
c81c35df MW |
388 | struct tvec_benchctx *bc = ctx; |
389 | const struct tvec_benchenv *be = bc->be; | |
390 | const struct tvec_env *subenv = be->env; | |
e63124bc | 391 | |
c81c35df MW |
392 | /* Restore the benchmark state's old target. */ |
393 | bc->bst->target_s = bc->dflt_target; | |
394 | bc->f &= ~TVBF_SETTRG; | |
e63124bc | 395 | |
c81c35df MW |
396 | /* Pass the call on to the subsidiary environment. */ |
397 | if (subenv && subenv->after) subenv->after(tv, bc->subctx); | |
398 | } | |
e63124bc | 399 | |
c81c35df MW |
400 | /* --- @tvec_benchteardown@ --- * |
401 | * | |
402 | * Arguments: @struct tvec_state *tv@ = test vector state | |
403 | * @void *ctx@ = context pointer | |
404 | * | |
405 | * Returns: --- | |
406 | * | |
407 | * Use: Tear down the benchmark environment. | |
408 | */ | |
e63124bc | 409 | |
c81c35df MW |
410 | void tvec_benchteardown(struct tvec_state *tv, void *ctx) |
411 | { | |
412 | struct tvec_benchctx *bc = ctx; | |
413 | const struct tvec_benchenv *be; | |
414 | const struct tvec_env *subenv; | |
e63124bc | 415 | |
c81c35df MW |
416 | be = bc->be; subenv = be->env; |
417 | ||
418 | /* Tear down any subsidiary environment. */ | |
419 | if (subenv && subenv->teardown) | |
420 | subenv->teardown(tv, bc->subctx); | |
421 | ||
422 | /* If the benchmark state was temporary, then dispose of it. */ | |
423 | if (bc->bst) { | |
424 | if (be->bst) bc->bst->target_s = bc->dflt_target; | |
425 | else { bench_destroy(bc->bst); xfree(bc->bst); } | |
e63124bc MW |
426 | } |
427 | } | |
428 | ||
429 | /*----- That's all, folks -------------------------------------------------*/ |