1 files changed, 58 insertions, 0 deletions
diff --git a/vespalib/src/tests/random/friendfinder.cpp b/vespalib/src/tests/random/friendfinder.cpp
new file mode 100644
index 00000000000..3a8070ccf2c
--- /dev/null
+++ b/vespalib/src/tests/random/friendfinder.cpp
@@ -0,0 +1,58 @@
+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+#include <vespa/fastos/fastos.h>
+#include <vespa/vespalib/util/random.h>
+#include <math.h>
+#include <stdio.h>
+#include <vespa/vespalib/stllike/string.h>
+
+int main(int argc, char **argv)
+{
+    vespalib::RandomGen rnd(1);
+
+    double logmean = log(1000.0);
+    double lstddev = log(2.0);
+
+    if (argc > 2) {
+        lstddev = log(strtod(argv[--argc], NULL));
+        logmean = log(strtod(argv[--argc], NULL));
+    } else if (argc > 1) {
+        logmean = log(strtod(argv[--argc], NULL));
+    }
+
+    fprintf(stderr, "100 typical friendlist sizes: ");
+    for (int i = 0; i < 100; ++i) {
+        int32_t want = (uint32_t)exp(rnd.nextNormal(logmean, lstddev));
+        fprintf(stderr, " %u", want);
+    }
+    fprintf(stderr, "\n");
+
+    uint32_t person = 0;
+    while (!feof(stdin)) {
+        ++person;
+        std::vector<vespalib::string> friends;
+        int32_t want = (uint32_t)exp(rnd.nextNormal(logmean, lstddev));
+        if (want < 17) want = (uint32_t)(exp(logmean)+0.99);
+        if (want < 1) want = 1;
+
+        printf("me: %u friends:", person);
+        while (want > 0) {
+            char line[100];
+            if (fgets(line, 100, stdin) == NULL) {
+                break;
+            }
+            if (rnd.nextUint32() % 42 == 17) {
+                vespalib::string s(line);
+                s.chomp();
+                friends.push_back(s);
+                --want;
+            }
+        }
+        while (!friends.empty()) {
+            printf(" %s", friends.back().c_str());
+            friends.pop_back();
+        }
+        printf("\n");
+        fflush(stdout);
+    }
+}
+