rough benchmarking stuff

Makefile

@@ -6,6 +6,9 @@ SHOBJ = crap_eq.so crap_eq_const.so crap_noise.so
 MID =
 HEADERS = crap_util.h crap_util_def.h ladspa.h
 
+BENCH = bench.o
+AGAINST = ./crap_eq_const.so
+
 OBJ = ${SHOBJ:.so=.o} ${EXE:=.o} ${MID}
 SRC = ${OBJ:.o=.c}
 
@@ -24,6 +27,11 @@ LADSPADEST = ${DESTDIR}${LADSPADIR}
 
 all: options ${ALL}
 
+bench: all ${BENCH}
+	@echo LD ${BENCH} ${MID} -o $@
+	@${CC} ${ALL_CFLAGS} ${BENCH} -o $@ ${ALL_LDFLAGS} -rdynamic -ldl
+	./bench.sh ./bench ${AGAINST}
+
 .PHONY: options
 options:
 	@echo "ALL_CFLAGS     = ${ALL_CFLAGS}"
@@ -49,12 +57,13 @@ install: all
 	install -m 644 ${SHOBJ} ${LADSPADEST}
 
 clean:
-	-rm -f ${ALL}
+	-rm -f ${ALL} bench ${BENCH}
 
 dist:
 	-rm -f ${FULLNAME}.tar.gz
 	mkdir -p ${FULLNAME}
 	cp LICENSE README.md Makefile ${HEADERS} ${SRC} ${FULLNAME}
+	cp bench.sh ${BENCH:.o=.c} ${FULLNAME}
 	tar -cf ${FULLNAME}.tar ${FULLNAME}
 	gzip ${FULLNAME}.tar
 	rm -rf ${FULLNAME}

bench.c

@@ -0,0 +1,61 @@
+#include <stdlib.h>
+#include <assert.h>
+#include <time.h>
+
+#include "dlfcn.h"
+#include "ladspa.h"
+#include "crap_util.h"
+
+enum {
+	BLOCK_SIZE=2048
+};
+
+float inputs[BLOCK_SIZE];
+float outputs[BLOCK_SIZE];
+void *plug = NULL;
+
+static void
+cleanup() {
+	dlclose(plug);
+}
+
+static const LADSPA_Descriptor*
+load_ladspa(char *path) {
+	plug = dlopen(path, RTLD_NOW);
+	assert(plug);
+	atexit(cleanup);
+
+	LADSPA_Descriptor_Function df = dlsym(plug, "ladspa_descriptor");
+	assert(df);
+
+	const LADSPA_Descriptor *d = df(0);
+	assert(d);
+
+	return d;
+}
+
+int
+main(int argc, char **argv) {
+	assert(argc > 1);
+
+	const LADSPA_Descriptor *d = load_ladspa(argv[1]);
+
+	LADSPA_Handle h = d->instantiate(d, 44100);
+	assert(h);
+
+	d->connect_port(h, 0, inputs);
+	d->connect_port(h, 1, outputs);
+
+	mirand = time(NULL);
+	for (int i = 0; i < BLOCK_SIZE; i++)
+		inputs[i] = whitenoise();
+
+	if (d->activate) d->activate(h);
+	for (int i = 0; i < 64*64*8; i++)
+		d->run(h, BLOCK_SIZE);
+	if (d->deactivate) d->deactivate(h);
+
+	d->cleanup(h);
+
+	return 0;
+}

bench.sh

@@ -0,0 +1,19 @@
+#!/bin/zsh
+local bench="$1"
+local against="$2"
+local i x n=0 t m=9999
+finish() {
+    [ $n -gt 0 ] && printf "\nmin %.3f  avg %.3f  total %.3f\n" $m $((x/n)) $x
+    exit 0
+}
+trap finish INT
+echo -n "…"
+for ((i=0; i<8; i++)); do
+    sleep 0.5
+    t="$(TIMEFMT='%*E'$'\n'; (time "$bench" "$against") 2>&1)"
+    echo -n " ${t}"
+    let 'x += t'
+    let 'n += 1'
+    [[ $t < $m ]] && m=$t
+done
+finish