Add target to run collision interval test (100K to 1M @ 0.001).

Makefile

@@ -1,5 +1,5 @@
 
-# Copyright (c) 2012-2015, Jyri J. Virkki
+# Copyright (c) 2012-2016, Jyri J. Virkki
 # All rights reserved.
 #
 # This file is under BSD license. See LICENSE file.
@@ -21,7 +21,7 @@
 #   make perf_report    generate perf reports (see README.perf)
 #
 
-BLOOM_VERSION=1.2
+BLOOM_VERSION=1.3dev
 
 TOP := $(shell /bin/pwd)
 BUILD_OS := $(shell uname)
@@ -122,3 +122,15 @@ gcov:
 		./test-libbloom && \
 		gcov -bf bloom.c)
 	@echo Remember to make clean to remove instrumented objects
+
+#
+# This target runs a test which creates a filter of capacity N and inserts
+# N elements, for N in 100,000 to 1,000,000 with an expected error of 0.001.
+# To preserve and graph the output, move it to ./data/collisions and use
+# the ./data/collisions/dograph script to plot it.
+#
+# WARNING: This can take a very long time (on a slow machine, multiple days)
+# to run.
+#
+collision_test: $(BUILD)/test-libbloom
+	$(BUILD)/test-libbloom -G 100000 1000000 10 0.001 | tee collision_data_v$(BLOOM_VERSION)

test.c

@@ -160,11 +160,9 @@ static void perf_loop(int entries, int count)
  */
 int main(int argc, char **argv)
 {
-  (void)printf("testing libbloom...\n");
-
   if (argc == 6 && !strncmp(argv[1], "-G", 2)) {
     int e;
-    for (e = atoi(argv[2]); e < atoi(argv[3]); e+= atoi(argv[4])) {
+    for (e = atoi(argv[2]); e <= atoi(argv[3]); e+= atoi(argv[4])) {
       add_random(e, atof(argv[5]), e, 0, 1, 0);
     }
     exit(0);