From 1a2e1fff7ce4b8fd8db46549d81e71e76b842da3 Mon Sep 17 00:00:00 2001
From: Kimplul <kimi.h.kuparinen@gmail.com>
Date: Fri, 30 Aug 2024 18:56:49 +0300
Subject: add some basic benchmarks

---
 benchmarks/scripts/gen-benchmark | 32 +++++++++++++++++++++++++++
 benchmarks/scripts/makefile      | 47 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 79 insertions(+)
 create mode 100755 benchmarks/scripts/gen-benchmark
 create mode 100644 benchmarks/scripts/makefile

(limited to 'benchmarks/scripts')

diff --git a/benchmarks/scripts/gen-benchmark b/benchmarks/scripts/gen-benchmark
new file mode 100755
index 0000000..459040d
--- /dev/null
+++ b/benchmarks/scripts/gen-benchmark
@@ -0,0 +1,32 @@
+#!/bin/sh
+
+NAME=
+while getopts "n:p:" opt; do
+	case "$opt" in
+		n) NAME="$OPTARG";;
+		*) echo "unrecognised options -$OPTARG" >&2; exit 1;
+	esac
+done
+
+obj="build/${NAME}/init.o"
+dep="${obj}.d"
+
+echo "${dep}:"							>> benchmarks.mk
+echo "-include ${dep}"						>> benchmarks.mk
+echo "${obj}: $NAME/${s}"					>> benchmarks.mk
+echo "	mkdir -p build/$NAME"					>> benchmarks.mk
+echo "	\$(COMPILE_BENCHMARK) -c $NAME/init.c -o ${obj}"	>> benchmarks.mk
+
+echo "build/${NAME}/initrd: ${obj} \$(COMMON)"			>> benchmarks.mk
+echo "	\$(COMPILE_BENCHMARK) ${obj} \
+	\$(COMMON) -o build/${NAME}/init"			>> benchmarks.mk
+
+echo "	echo build/${NAME}/init | \
+	\$(GEN_INITRD) build/${NAME}/initrd"			>> benchmarks.mk
+
+echo "BENCHMARKS += ${NAME}"					>> benchmarks.mk
+echo ".PHONY: ${NAME}"						>> benchmarks.mk
+echo "${NAME}: build/${NAME}/initrd"				>> benchmarks.mk
+echo "	mkdir -p reports/${NAME}"				>> benchmarks.mk
+echo "	timeout --foreground 30s \
+	\$(QEMU) build/${NAME}/initrd > reports/${NAME}/log"	>> benchmarks.mk
diff --git a/benchmarks/scripts/makefile b/benchmarks/scripts/makefile
new file mode 100644
index 0000000..7140c05
--- /dev/null
+++ b/benchmarks/scripts/makefile
@@ -0,0 +1,47 @@
+.PHONY: all
+all: benchmark
+
+ARCH		?= riscv64
+CROSS_COMPILE	?= $(ARCH)-unknown-elf-
+
+LLVM		?= 0
+COMPILER	!= [ "$(LLVM)" != "0" ] \
+			&& echo clang --target="$(CROSS_COMPILE)" \
+			|| echo $(CROSS_COMPILE)gcc
+
+include common/arch/$(ARCH)/source.mk
+
+OBFLAGS		:= -ffreestanding -nostdlib -std=c17 -g -O2
+INCLUDEFLAGS	:= -I ../include -I.
+WARNFLAGS	:= -Wall -Wextra
+DEPFLAGS	= -MT $@ -MMD -MP -MF $@.d
+COMPILE_BENCHMARK	= $(COMPILER) $(WARNFLAGS) $(INCLUDEFLAGS) \
+			  $(DEPFLAGS) $(OBFLAGS) $(ARCH_FLAGS)
+
+GEN_INITRD	:= cpio -H newc -o >
+
+# icount gives a rough approximation of how many instructions are executed, but
+# *actual* performance would still have to be measured on real systems
+QEMU		:= qemu-system-$(ARCH) -machine virt -kernel ../kmi.bin \
+		   -serial stdio \
+		   -monitor none \
+		   -nographic \
+		   -no-reboot \
+		   -m 128M \
+		   -icount 0 \
+		   -initrd
+
+KMI		:= ../kmi.bin
+COMMON		:= build/printf.o
+
+build/printf.o: common/printf.c $(KMI)
+	$(COMPILE_BENCHMARK) -c common/printf.c -o build/printf.o
+
+BENCHMARKS :=
+include benchmarks.mk
+
+.PHONY: benchmark
+benchmark: $(BENCHMARKS)
+	@cd reports; for d in * ; do				\
+		printf "%8s: " "$$d"; tail -n 1 $$d/log | tr -d '\r' | bc -l;	\
+	done
-- 
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