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SHELL := $(shell which bash)
.ONESHELL:

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CXXFLAGS = -march=native -O3 -pthread -std=c++20 -Wall
LDLIBS = -lrt

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ATT = $(EXE:=.att)
SRC = $(wildcard *.cc)
EXE = $(basename $(SRC))
DAT = $(EXE:=.dat)
LOG = $(EXE:=.log)
RUN = 25
TXT = $(EXE:=.txt)

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all:
	@if make -qs $(TXT); then
		make -s sort
	else
		make -s stat
	fi

att: $(ATT)

clean:
	-rm -fv $(ATT) $(DAT) $(EXE) $(LOG) $(TXT) {vg,}core.* perf.data *~

exe: $(EXE)

key:
	@printf '%54s\n' | tr ' ' -
	echo "key: program  = IPC type"
	echo "     messages = averaged (pings + pongs)"
	echo "     elapsed  = elapsed time (ms)"
	echo "     cpu      = cpu clock time (ms)"
	echo "     ratio    = messages / cpu"

sort: $(TXT) | key
	@declare -a F=(program messages elapsed cpu ratio)
	declare -a R=('-b' '-r' '-s' '-s' '-r')
	for ((i=0; i<$${#F[@]}; ++i)); do
		printf '%54s\n' | tr ' ' '-'
		head -n 1 -q $< | sed "s/  $${F[$$i]}/\[$${F[$$i]}\]/"
		printf '%54s\n' | tr ' ' '-'
		for t in $^; do
			tail -n 1 $$t
		done | sort -k$$((i+1)),$$((i+1)) -k$${#F[@]},$${#F[@]} $${R[$$i]}
	done
	printf '%54s\n' | tr ' ' '-'

stat: key
	@for i in $(TXT); do
		make -s $$i
		if [[ "$$i" == "$(firstword $(TXT))" ]]; then
			printf '%54s\n' | tr ' ' -
			head -n 1 $$i
			printf '%54s\n' | tr ' ' -
		fi
		tail -n 1 $$i
	done
	printf '%54s\n' | tr ' ' -

txt: $(TXT)

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%.att: %
	objdump -CdS $< > $@

%.dat %.log: %
	old=$$(sysctl kernel.perf_event_paranoid);
	if sudo -n true; then
		sudo sysctl kernel.perf_event_paranoid=-1
	fi &> /dev/null
	LANG=C perf stat -e cpu-clock,duration_time -r $(RUN) -x ',' -- ./$< 1> $*.log 2> $*.dat
	if sudo -n true; then
		sudo sysctl kernel.perf_event_paranoid=$$old
	fi &> /dev/null

%.txt: %.dat %.log
	while read -r a b ping; read d e pong; do
		min=$$((ping < pong ? ping : pong))
		max=$$((ping > pong ? ping : pong))
		if (( max > min + 1 )); then
			echo "fallo en $*.log: nº de pings != nº de pongs!!!"
			exit 1
		fi
		sum=$$((ping + pong))
	done < $*.log
	avg=$$((sum / $(RUN)))
	time=$$(grep duration_time $*.dat | cut -d',' -f1)
	time=$$(bc -l <<< "scale=2; $$time/1000000" 2> /dev/null)
	cpu=$$(grep cpu-clock $*.dat | cut -d',' -f1)
	ratio=$$(bc -l <<< "scale=2; $$avg/$$cpu" 2> /dev/null)
	printf '%10s %10s %10s %10s %10s\n' program messages elapsed cpu ratio > $@
	printf '%10s %10s %10s %10s %10s\n' $* $$avg $$time $$cpu $$ratio >> $@

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.PHONY: all att clean key exe sort stat txt
.PRECIOUS: $(LOG) $(DAT) $(TXT)
.NOEXPORT:

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