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Detailed benchmark outputs for functions
This patch adds an option to get detailed benchmark output for functions. Invoking the benchmark with 'make DETAILED=1 bench' causes each benchmark program to store a mean execution time for each input it works on. This is useful to give a more comprehensive picture of performance of functions compared to just the single mean figure.
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ChangeLog
10
ChangeLog
@ -1,5 +1,15 @@
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2014-03-29 Siddhesh Poyarekar <siddhesh@redhat.com>
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* benchtests/Makefile (DETAILED_OPT): New make option.
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(bench-func): Run benchmark program with -d if DETAILED_OPT is
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set.
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* benchtests/bench-skeleton.c: Include stdbool.h.
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(main): Store and print timings per input.
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* benchtests/scripts/bench.py (STRUCT_TEMPLATE): Add timing
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member to each argument value.
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(EPILOGUE): Define new macros RESULT and RESULT_ACCUM.
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(_print_arg_data): Initialize per-input timing to 0.
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* benchtests/Makefile (timing-type): New binary.
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(bench-clean): Also remove bench-timing-type.
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(bench): New target for timing-type.
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@ -86,6 +86,12 @@ ifdef USE_CLOCK_GETTIME
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CPPFLAGS-nonlib += -DUSE_CLOCK_GETTIME
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endif
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DETAILED_OPT :=
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ifdef DETAILED
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DETAILED_OPT := -d
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endif
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# This makes sure CPPFLAGS-nonlib and CFLAGS-nonlib are passed
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# for all these modules.
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cpp-srcs-left := $(binaries-benchset:=.c) $(binaries-bench:=.c)
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@ -126,7 +132,7 @@ bench-func: $(binaries-bench)
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echo ","; \
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fi; \
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echo "Running $${run}" >&2; \
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$(run-bench); \
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$(run-bench) $(DETAILED_OPT); \
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done; \
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echo " }"; \
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echo "}"; } > $(objpfx)bench.out-tmp; \
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@ -18,6 +18,7 @@
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#include <string.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <time.h>
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#include <inttypes.h>
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@ -48,6 +49,10 @@ main (int argc, char **argv)
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unsigned long i, k;
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struct timespec runtime;
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timing_t start, end;
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bool detailed = false;
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if (argc == 2 && !strcmp (argv[1], "-d"))
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detailed = true;
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startup();
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@ -72,6 +77,7 @@ main (int argc, char **argv)
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double d_total_i = 0;
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timing_t total = 0, max = 0, min = 0x7fffffffffffffff;
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int64_t c = 0;
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while (1)
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{
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for (i = 0; i < NUM_SAMPLES (v); i++)
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@ -91,8 +97,13 @@ main (int argc, char **argv)
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min = cur;
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TIMING_ACCUM (total, cur);
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/* Accumulate timings for the value. In the end we will divide
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by the total iterations. */
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RESULT_ACCUM (cur, v, i, c * iters, (c + 1) * iters);
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d_total_i += iters;
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}
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c++;
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struct timespec curtime;
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memset (&curtime, 0, sizeof (curtime));
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@ -114,6 +125,17 @@ main (int argc, char **argv)
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d_total_s, d_total_i, max / d_iters, min / d_iters,
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d_total_s / d_total_i);
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if (detailed)
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{
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printf (",\n\"timings\": [");
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for (int i = 0; i < NUM_SAMPLES (v); i++)
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{
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if (i > 0)
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putc (',', stdout);
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printf ("%g", RESULT (v, i));
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}
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puts ("]");
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}
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puts ("}");
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}
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@ -50,6 +50,7 @@ STRUCT_TEMPLATE = '''
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struct args
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{
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%(args)s
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double timing;
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};
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struct _variants
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@ -80,6 +81,9 @@ struct _variants variants[%(num_variants)d] = {
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# Epilogue for the generated source file.
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EPILOGUE = '''
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#define RESULT(__v, __i) (variants[(__v)].in[(__i)].timing)
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#define RESULT_ACCUM(r, v, i, old, new) \\
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((RESULT ((v), (i))) = (RESULT ((v), (i)) * (old) + (r)) / ((new) + 1))
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#define BENCH_FUNC(i, j) ({%(getret)s CALL_BENCH_FUNC (i, j);})
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#define FUNCNAME "%(func)s"
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#include "bench-skeleton.c"'''
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@ -168,7 +172,7 @@ def _print_arg_data(func, directives, all_vals):
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# Now print the values.
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variants = []
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for (k, vals), i in zip(all_vals.items(), itertools.count()):
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out = [' {%s},' % v for v in vals]
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out = [' {%s, 0},' % v for v in vals]
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# Members for the variants structure list that we will
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# print later.
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