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HP_TIMING uses native timestamping instructions if available, thus greatly reducing the overhead of recording start and end times for function calls. For architectures that don't have HP_TIMING available, we fall back to the clock_gettime bits. One may also override this by invoking the benchmark as follows: make USE_CLOCK_GETTIME=1 bench and get the benchmark results using clock_gettime. One has to do `make bench-clean` to ensure that the benchmark programs are rebuilt.
132 lines
3.7 KiB
Makefile
132 lines
3.7 KiB
Makefile
# Copyright (C) 2013 Free Software Foundation, Inc.
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# This file is part of the GNU C Library.
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# The GNU C Library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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# The GNU C Library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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# You should have received a copy of the GNU Lesser General Public
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# License along with the GNU C Library; if not, see
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# <http://www.gnu.org/licenses/>.
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# Makefile for benchmark tests. The only useful target here is `bench`.
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# Adding a new function `foo`:
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# ---------------------------
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# - Append the function name to the bench variable
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# - Define foo-ARGLIST as a colon separated list of types of the input
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# arguments. Use `void` if function does not take any inputs. Put in quotes
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# if the input argument is a pointer, e.g.:
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# malloc-ARGLIST: "void *"
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# - Define foo-RET as the type the function returns. Skip if the function
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# returns void. One could even skip foo-ARGLIST if the function does not
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# take any inputs AND the function returns void.
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# - Make a file called `foo-inputs` with one input value per line, an input
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# being a comma separated list of arguments to be passed into the function.
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# See pow-inputs for an example.
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subdir := benchtests
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bench := exp pow rint sin cos tan atan modf
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exp-ARGLIST = double
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exp-RET = double
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LDFLAGS-bench-exp = -lm
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pow-ARGLIST = double:double
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pow-RET = double
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LDFLAGS-bench-pow = -lm
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rint-ARGLIST = double
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rint-RET = double
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LDFLAGS-bench-rint = -lm
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sin-ARGLIST = double
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sin-RET = double
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LDFLAGS-bench-sin = -lm
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cos-ARGLIST = double
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cos-RET = double
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LDFLAGS-bench-cos = -lm
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tan-ARGLIST = double
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tan-RET = double
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LDFLAGS-bench-tan = -lm
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atan-ARGLIST = double
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atan-RET = double
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LDFLAGS-bench-atan = -lm
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# Rules to build and execute the benchmarks. Do not put any benchmark
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# parameters beyond this point.
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include ../Makeconfig
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include ../Rules
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binaries-bench := $(addprefix $(objpfx)bench-,$(bench))
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# The default duration: 10 seconds.
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ifndef BENCH_DURATION
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BENCH_DURATION := 10
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endif
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CPPFLAGS-nonlib = -DDURATION=$(BENCH_DURATION)
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# Use clock_gettime to measure performance of functions. The default is to use
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# HP_TIMING if it is available.
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ifdef USE_CLOCK_GETTIME
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CPPFLAGS-nonlib += -DUSE_CLOCK_GETTIME
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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-bench:=.c)
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lib := nonlib
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include $(patsubst %,$(..)cppflags-iterator.mk,$(cpp-srcs-left))
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bench-deps := bench-skeleton.c bench-timing.h Makefile
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run-bench = $(test-wrapper-env) \
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GCONV_PATH=$(common-objpfx)iconvdata LC_ALL=C \
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$($*-ENV) $(rtld-prefix) $${run}
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bench-clean:
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rm -f $(binaries-bench) $(addsuffix .o,$(binaries-bench))
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bench: $(binaries-bench)
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{ for run in $^; do \
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echo "Running $${run}" >&2; \
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$(run-bench); \
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done; } > $(objpfx)bench.out-tmp; \
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if [ -f $(objpfx)bench.out ]; then \
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mv -f $(objpfx)bench.out $(objpfx)bench.out.old; \
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fi; \
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mv -f $(objpfx)bench.out-tmp $(objpfx)bench.out
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$(binaries-bench): %: %.o \
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$(sort $(filter $(common-objpfx)lib%,$(link-libc))) \
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$(addprefix $(csu-objpfx),start.o) $(+preinit) $(+postinit)
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$(+link)
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$(objpfx)bench-%.c: %-inputs $(bench-deps)
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{ if [ -n "$($*-INCLUDE)" ]; then \
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cat $($*-INCLUDE); \
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fi; \
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$(..)scripts/bench.pl $(patsubst %-inputs,%,$<) \
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$($*-ARGLIST) $($*-RET); } > $@-tmp
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mv -f $@-tmp $@
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