/*----- Data structures ---------------------------------------------------*/
struct benchrun {
- struct tvec_state *tv;
- const struct tvec_env *env;
- void *ctx;
- unsigned long *n;
- const struct tvec_reg *in; struct tvec_reg *out;
- tvec_testfn *fn;
+ struct tvec_state *tv; /* test vector state */
+ const struct tvec_env *env; /* subordinate environment */
+ void *ctx; /* subordinate env's context */
+ unsigned long *n; /* iteration count address */
+ const struct tvec_reg *in; struct tvec_reg *out; /* register vectors */
+ tvec_testfn *fn; /* test function to run */
};
/*----- Global variables --------------------------------------------------*/
-struct bench_state *tvec_benchstate;
+struct bench_state *tvec_benchstate; /* common benchmarking state */
-/*----- Benchmarking ------------------------------------------------------*/
+/*----- Utilities ---------------------------------------------------------*/
+
+/* --- @normalize@ --- *
+ *
+ * Arguments: @double *x_inout@ = address of a value to normalize
+ * @const char **unit_out@ = address to store unit prefix
+ * @double scale@ = scale factor for unit steps
+ *
+ * Returns: ---
+ *
+ * Use: Adjust @*x_inout@ by a power of @scale@, and set @*unit_out@
+ * so that printing the two reflects the original value with an
+ * appropriate SI unit scaling. The @scale@ should be 1024 for
+ * binary quantities, most notably memory sizes, or 1000 for
+ * other quantities.
+ */
static void normalize(double *x_inout, const char **unit_out, double scale)
{
*x_inout = x; *unit_out = *u;
}
+/*----- Benchmark environment scaffolding ---------------------------------*/
+
+/* --- @tvec_benchsetup@ --- *
+ *
+ * Arguments: @struct tvec_state *tv@ = test vector state
+ * @const struct tvec_env *env@ = environment description
+ * @void *pctx@ = parent context (ignored)
+ * @void *ctx@ = context pointer to initialize
+ *
+ * Returns: Zero on success, @-1@ on failure.
+ *
+ * Use: Initialize a benchmarking environment context.
+ *
+ * The environment description must really be a @struct
+ * tvec_bench@. If the @bst@ slot is null, then a temporary
+ * benchmark state is allocated for the current test group and
+ * released at the end. Otherwise, it must be the address of a
+ * pointer to a benchmark state: if the pointer is null, then a
+ * fresh state is allocated and initialized and the pointer is
+ * updated; otherwise, the pointer is assumed to refer to an
+ * existing valid benchmark state.
+ */
+
int tvec_benchsetup(struct tvec_state *tv, const struct tvec_env *env,
void *pctx, void *ctx)
{
const struct tvec_env *subenv = b->env;
struct bench_timer *bt;
+ /* Basic initialization. */
bc->b = b; bc->bst = 0; bc->subctx = 0;
+ /* Set up the benchmarking state if it hasn't been done before. */
if (!b->bst || !*b->bst) {
bt = bench_createtimer(); if (!bt) goto fail_timer;
bc->bst = xmalloc(sizeof(*bc->bst)); bench_init(bc->bst, bt);
goto fail_timer;
else
bc->bst = *b->bst;
+
+ /* Set the default target time. */
bc->dflt_target = bc->bst->target_s;
+ /* Initialize the subordinate environment. */
if (subenv && subenv->ctxsz) bc->subctx = xmalloc(subenv->ctxsz);
if (subenv && subenv->setup && subenv->setup(tv, subenv, bc, bc->subctx))
{ xfree(bc->subctx); bc->subctx = 0; return (-1); }
+ /* All done. */
end:
return (0);
fail_timer:
tvec_skipgroup(tv, "failed to create timer"); goto end;
}
+/* --- @tvec_benchset@ --- *
+ *
+ * Arguments: @struct tvec_state *tv@ = test vector state
+ * @const char *var@ = variable name to set
+ * @const struct tvec_env *env@ = environment description
+ * @void *ctx@ = context pointer
+ *
+ * Returns: Zero on success, @-1@ on failure.
+ *
+ * Use: Set a special variable. The following special variables are
+ * supported.
+ *
+ * * %|@target|% is the (approximate) number of seconds to run
+ * the benchmark.
+ *
+ * Unrecognized variables are passed to the subordinate
+ * environment, if there is one.
+ */
+
int tvec_benchset(struct tvec_state *tv, const char *var,
const struct tvec_env *env, void *ctx)
{
return (0);
}
+/* --- @tvec_benchbefore@ --- *
+ *
+ * Arguments: @struct tvec_state *tv@ = test vector state
+ * @void *ctx@ = context pointer
+ *
+ * Returns: Zero on success, @-1@ on failure.
+ *
+ * Use: Invoke the subordinate environment's @before@ function to
+ * prepare for the benchmark.
+ */
+
int tvec_benchbefore(struct tvec_state *tv, void *ctx)
{
struct tvec_benchctx *bc = ctx;
const struct tvec_bench *b = bc->b;
const struct tvec_env *subenv = b->env;
+ /* Just call the subsidiary environment. */
if (subenv && subenv->before) return (subenv->before(tv, bc->subctx));
else return (0);
}
+/* --- @tvec_benchafter@ --- *
+ *
+ * Arguments: @struct tvec_state *tv@ = test vector state
+ * @void *ctx@ = context pointer
+ *
+ * Returns: ---
+ *
+ * Use: Invoke the subordinate environment's @after@ function to
+ * clean up after the benchmark.
+ */
+
void tvec_benchafter(struct tvec_state *tv, void *ctx)
{
struct tvec_benchctx *bc = ctx;
const struct tvec_bench *b = bc->b;
const struct tvec_env *subenv = b->env;
+ /* Restore the benchmark state's old target. */
bc->bst->target_s = bc->dflt_target;
+
+ /* Pass the call on to the subsidiary environment. */
if (subenv && subenv->after) subenv->after(tv, bc->subctx);
}
+/* --- @tvec_benchteardown@ --- *
+ *
+ * Arguments: @struct tvec_state *tv@ = test vector state
+ * @void *ctx@ = context pointer
+ *
+ * Returns: ---
+ *
+ * Use: Tear down the benchmark environment.
+ */
+
void tvec_benchteardown(struct tvec_state *tv, void *ctx)
{
struct tvec_benchctx *bc = ctx;
if (!bc) return;
b = bc->b; subenv = b->env;
+
+ /* Tear down any subsidiary environment. */
if (subenv && subenv->teardown && bc->subctx)
subenv->teardown(tv, bc->subctx);
+
+ /* If the benchmark state was temporary, then dispose of it. */
if (bc->bst) {
if (b->bst) bc->bst->target_s = bc->dflt_target;
else { bench_destroy(bc->bst); xfree(bc->bst); }
}
}
-static void benchloop_outer_direct(unsigned long n, void *p)
+/*----- Measurement machinery ---------------------------------------------*/
+
+/* --- @benchloop_...@ --- *
+ *
+ * Arguments: @unsigned long n@ = iteration count
+ * @void *ctx@ = benchmark running context
+ *
+ * Returns: ---
+ *
+ * Use: Run various kinds of benchmarking loops.
+ *
+ * * The @..._outer_...@ functions call the underlying
+ * function @n@ times in a loop; by contrast, the
+ * @..._inner_...@ functions set a register value to the
+ * chosen iteration count and expect the underlying function
+ * to perform the loop itself.
+ *
+ * * The @..._direct@ functions just call the underlying test
+ * function directly (though still through an `indirect
+ * jump' instruction); by contrast, the @..._indirect@
+ * functions invoke a subsidiary environment's @run@
+ * function, which adds additional overhead.
+ */
+
+static void benchloop_outer_direct(unsigned long n, void *ctx)
{
- struct benchrun *r = p;
- tvec_testfn *fn = r->fn; void *ctx = r->ctx;
+ struct benchrun *r = ctx;
+ tvec_testfn *fn = r->fn; void *tctx = r->ctx;
const struct tvec_reg *in = r->in; struct tvec_reg *out = r->out;
- while (n--) fn(in, out, ctx);
+ while (n--) fn(in, out, tctx);
}
-static void benchloop_inner_direct(unsigned long n, void *p)
- { struct benchrun *r = p; *r->n = n; r->fn(r->in, r->out, r->ctx); }
+static void benchloop_inner_direct(unsigned long n, void *ctx)
+ { struct benchrun *r = ctx; *r->n = n; r->fn(r->in, r->out, r->ctx); }
-static void benchloop_outer_indirect(unsigned long n, void *p)
+static void benchloop_outer_indirect(unsigned long n, void *ctx)
{
- struct benchrun *r = p;
+ struct benchrun *r = ctx;
struct tvec_state *tv = r->tv;
void (*run)(struct tvec_state *, tvec_testfn, void *) = r->env->run;
- tvec_testfn *fn = r->fn; void *ctx = r->ctx;
+ tvec_testfn *fn = r->fn; void *tctx = r->ctx;
- while (n--) run(tv, fn, ctx);
+ while (n--) run(tv, fn, tctx);
}
-static void benchloop_inner_indirect(unsigned long n, void *p)
- { struct benchrun *r = p; *r->n = n; r->env->run(r->tv, r->fn, r->ctx); }
+static void benchloop_inner_indirect(unsigned long n, void *ctx)
+ { struct benchrun *r = ctx; *r->n = n; r->env->run(r->tv, r->fn, r->ctx); }
+
+/* --- @tvec_benchrun@ --- *
+ *
+ * Arguments: @struct tvec_state *tv@ = test vector state
+ * @tvec_testfn *fn@ = test function to run
+ * @void *ctx@ = context pointer for the test function
+ *
+ * Returns: ---
+ *
+ * Use: Measures and reports the performance of a test function.
+ *
+ *
+ */
void tvec_benchrun(struct tvec_state *tv, tvec_testfn *fn, void *ctx)
{
unsigned f = 0;
#define f_any 1u
+ /* Fill in the easy parts of the run context. */
r.tv = tv; r.env = subenv; r.ctx = bc->subctx;
r.in = tv->in; r.out = tv->out; r.fn = fn;
+ /* Decide on the run function to select. */
if (b->riter >= 0) {
r.n = &TVEC_REG(tv, in, b->riter)->v.u;
loopfn = subenv && subenv->run ?
benchloop_outer_indirect : benchloop_outer_direct;
}
+ /* Decide on the kind of unit and the base count. */
base = b->niter;
if (b->rbuf < 0) unit = TVBU_OP;
else { unit = TVBU_BYTE; base *= TVEC_REG(tv, in, b->rbuf)->v.bytes.sz; }
+ /* Construct a description of the test using the identifier registers. */
for (rd = tv->test->regs; rd->name; rd++)
if (rd->f&TVRF_ID) {
if (f&f_any) dstr_puts(&d, ", ");
TVSF_COMPACT, &dstr_printops, &d);
}
+ /* Run the benchmark. */
o->ops->bbench(o, d.buf, unit);
if (bench_measure(&tm, bc->bst, base, loopfn, &r))
o->ops->ebench(o, d.buf, unit, 0);
#undef f_any
}
+/*----- Output utilities --------------------------------------------------*/
+
+/* --- @tvec_benchreport@ --- *
+ *
+ * Arguments: @const struct gprintf_ops *gops@ = print operations
+ * @void *go@ = print destination
+ * @unsigned unit@ = the unit being measured (~TVBU_...@)
+ * @const struct bench_timing *tm@ = the benchmark result
+ *
+ * Returns: ---
+ *
+ * Use: Formats a report about the benchmark performance. This
+ * function is intended to be called on by an output
+ * @ebench@ function.
+ */
+
void tvec_benchreport(const struct gprintf_ops *gops, void *go,
unsigned unit, const struct bench_timing *tm)
{
~mdw / mLib / blobdiff