From: Sage Weil <sage@inktank.com>
Date: Sat, 2 Nov 2013 17:58:30 +0000 (-0700)
Subject: crush: add a few unit tests for INDEP mode
X-Git-Tag: v0.74~16^2~19
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=0b9bb54448a472cbb85956ff7bef4bcb5cf5aae7;p=ceph.git

crush: add a few unit tests for INDEP mode

Signed-off-by: Sage Weil <sage@inktank.com>
---

diff --git a/src/test/Makefile.am b/src/test/Makefile.am
index b1cbf9fac990..80098e5d1c9c 100644
--- a/src/test/Makefile.am
+++ b/src/test/Makefile.am
@@ -278,6 +278,11 @@ unittest_util_CXXFLAGS = $(UNITTEST_CXXFLAGS)
 unittest_util_LDADD = $(LIBCOMMON) -lm $(UNITTEST_LDADD) $(CRYPTO_LIBS) $(EXTRALIBS)
 check_PROGRAMS += unittest_util
 
+unittest_crush_indep_SOURCES = test/crush/indep.cc
+unittest_crush_indep_CXXFLAGS = $(UNITTEST_CXXFLAGS)
+unittest_crush_indep_LDADD = $(LIBCOMMON) -lm $(UNITTEST_LDADD) $(CEPH_CRUSH) $(EXTRALIBS) $(CEPH_GLOBAL)
+check_PROGRAMS += unittest_crush_indep
+
 unittest_workqueue_SOURCES = test/test_workqueue.cc
 unittest_workqueue_CXXFLAGS = $(UNITTEST_CXXFLAGS)
 unittest_workqueue_LDADD = $(UNITTEST_LDADD) $(CEPH_GLOBAL)
diff --git a/src/test/crush/indep.cc b/src/test/crush/indep.cc
new file mode 100644
index 000000000000..1025a27e4cdd
--- /dev/null
+++ b/src/test/crush/indep.cc
@@ -0,0 +1,258 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2013 Inktank <info@inktank.com>
+ *
+ * LGPL2.1 (see COPYING-LGPL2.1) or later
+ */
+
+#include <iostream>
+#include <gtest/gtest.h>
+
+#include "include/stringify.h"
+#include "common/ceph_argparse.h"
+#include "global/global_init.h"
+#include "global/global_context.h"
+
+#include "crush/CrushWrapper.h"
+
+#include <set>
+
+CrushWrapper *build_indep_map(CephContext *cct, int num_rack, int num_host,
+			      int num_osd)
+{
+  CrushWrapper *c = new CrushWrapper;
+  c->create();
+
+  c->set_type_name(5, "root");
+  c->set_type_name(4, "row");
+  c->set_type_name(3, "rack");
+  c->set_type_name(2, "chasis");
+  c->set_type_name(1, "host");
+  c->set_type_name(0, "osd");
+
+  int rootno;
+  c->add_bucket(0, CRUSH_BUCKET_STRAW, CRUSH_HASH_RJENKINS1,
+		5, 0, NULL, NULL, &rootno);
+  c->set_item_name(rootno, "default");
+
+  map<string,string> loc;
+  loc["root"] = "default";
+
+  int osd = 0;
+  for (int r=0; r<num_rack; ++r) {
+    loc["rack"] = string("rack-") + stringify(r);
+    for (int h=0; h<num_host; ++h) {
+      loc["host"] = string("host-") + stringify(r) + string("-") + stringify(h);
+      for (int o=0; o<num_osd; ++o, ++osd) {
+	c->insert_item(cct, osd, 1.0, string("osd.") + stringify(osd), loc);
+      }
+    }
+  }
+
+  crush_rule *rule = crush_make_rule(3, 0, 123, 1, 20);
+  assert(rule);
+  crush_rule_set_step(rule, 0, CRUSH_RULE_TAKE, rootno, 0);
+  crush_rule_set_step(rule, 1,
+		      CRUSH_RULE_CHOOSE_LEAF_INDEP,
+		      CRUSH_CHOOSE_N,
+		      1);
+  crush_rule_set_step(rule, 2, CRUSH_RULE_EMIT, 0, 0);
+  int rno = crush_add_rule(c->crush, rule, -1);
+  c->set_rule_name(rno, "data");
+
+  if (false) {
+    Formatter *f = new_formatter("json-pretty");
+    f->open_object_section("crush_map");
+    c->dump(f);
+    f->close_section();
+    f->flush(cout);
+    delete f;
+  }
+
+  return c;
+}
+
+int get_num_dups(const vector<int>& v)
+{
+  std::set<int> s;
+  int dups = 0;
+  for (unsigned i=0; i<v.size(); ++i) {
+    if (s.count(v[i]))
+      ++dups;
+    else if (v[i] != CRUSH_ITEM_NONE)
+      s.insert(v[i]);
+  }
+  return dups;
+}
+
+TEST(CRUSH, indep_toosmall) {
+  CrushWrapper *c = build_indep_map(g_ceph_context, 1, 3, 1);
+  vector<__u32> weight(c->get_max_devices(), 0x10000);
+  c->dump_tree(weight, &cout, NULL);
+
+  for (int x = 0; x < 100; ++x) {
+    vector<int> out;
+    c->do_rule(0, x, out, 5, weight);
+    cout << x << " -> " << out << std::endl;
+    int num_none = 0;
+    for (unsigned i=0; i<out.size(); ++i) {
+      if (out[i] == CRUSH_ITEM_NONE)
+	num_none++;
+    }
+    ASSERT_EQ(2, num_none);
+    ASSERT_EQ(0, get_num_dups(out));
+  }
+  delete c;
+}
+
+TEST(CRUSH, indep_basic) {
+  CrushWrapper *c = build_indep_map(g_ceph_context, 3, 3, 3);
+  vector<__u32> weight(c->get_max_devices(), 0x10000);
+  c->dump_tree(weight, &cout, NULL);
+
+  for (int x = 0; x < 100; ++x) {
+    vector<int> out;
+    c->do_rule(0, x, out, 5, weight);
+    cout << x << " -> " << out << std::endl;
+    int num_none = 0;
+    for (unsigned i=0; i<out.size(); ++i) {
+      if (out[i] == CRUSH_ITEM_NONE)
+	num_none++;
+    }
+    ASSERT_EQ(0, num_none);
+    ASSERT_EQ(0, get_num_dups(out));
+  }
+  delete c;
+}
+
+TEST(CRUSH, indep_out_alt) {
+  CrushWrapper *c = build_indep_map(g_ceph_context, 3, 3, 3);
+  vector<__u32> weight(c->get_max_devices(), 0x10000);
+
+  // mark a bunch of osds out
+  int num = 3*3*3;
+  for (int i=0; i<num / 2; ++i)
+    weight[i*2] = 0;
+  c->dump_tree(weight, &cout, NULL);
+
+  // need more retries to get 9/9 hosts for x in 0..99
+  c->crush->choose_total_tries = 100;
+  for (int x = 0; x < 100; ++x) {
+    vector<int> out;
+    c->do_rule(0, x, out, 9, weight);
+    cout << x << " -> " << out << std::endl;
+    int num_none = 0;
+    for (unsigned i=0; i<out.size(); ++i) {
+      if (out[i] == CRUSH_ITEM_NONE)
+	num_none++;
+    }
+    ASSERT_EQ(0, num_none);
+    ASSERT_EQ(0, get_num_dups(out));
+  }
+  delete c;
+}
+
+TEST(CRUSH, indep_out_contig) {
+  CrushWrapper *c = build_indep_map(g_ceph_context, 3, 3, 3);
+  vector<__u32> weight(c->get_max_devices(), 0x10000);
+
+  // mark a bunch of osds out
+  int num = 3*3*3;
+  for (int i=0; i<num / 3; ++i)
+    weight[i] = 0;
+  c->dump_tree(weight, &cout, NULL);
+
+  c->crush->choose_total_tries = 100;
+  for (int x = 0; x < 100; ++x) {
+    vector<int> out;
+    c->do_rule(0, x, out, 7, weight);
+    cout << x << " -> " << out << std::endl;
+    int num_none = 0;
+    for (unsigned i=0; i<out.size(); ++i) {
+      if (out[i] == CRUSH_ITEM_NONE)
+	num_none++;
+    }
+    ASSERT_EQ(1, num_none);
+    ASSERT_EQ(0, get_num_dups(out));
+  }
+  delete c;
+}
+
+
+TEST(CRUSH, indep_out_progressive) {
+  CrushWrapper *c = build_indep_map(g_ceph_context, 3, 3, 3);
+  c->crush->choose_total_tries = 100;
+  vector<__u32> tweight(c->get_max_devices(), 0x10000);
+  c->dump_tree(tweight, &cout, NULL);
+
+  int tchanged = 0;
+  for (int x = 1; x < 5; ++x) {
+    vector<__u32> weight(c->get_max_devices(), 0x10000);
+
+  std::map<int,unsigned> pos;
+  vector<int> prev;
+  for (unsigned i=0; i<weight.size(); ++i) {
+    vector<int> out;
+    c->do_rule(0, x, out, 7, weight);
+    cout << "(" << i << "/" << weight.size() << " out) "
+	 << x << " -> " << out << std::endl;
+    int num_none = 0;
+    for (unsigned k=0; k<out.size(); ++k) {
+      if (out[k] == CRUSH_ITEM_NONE)
+	num_none++;
+    }
+    ASSERT_EQ(0, get_num_dups(out));
+
+    // make sure nothing moved
+    int moved = 0;
+    int changed = 0;
+    for (unsigned j=0; j<out.size()/2; ++j) {
+      if (i && out[j] != prev[j]) {
+	++changed;
+	++tchanged;
+      }
+      if (out[j] == CRUSH_ITEM_NONE) {
+	pos.erase(prev[j]);
+	continue;
+      }
+      if (i && pos.count(out[j])) {
+	// result shouldn't have moved position
+	if (j != pos[out[j]]) {
+	  cout << " " << out[j] << " moved from " << pos[out[j]] << " to " << j << std::endl;
+	  ++moved;
+	}
+	//ASSERT_EQ(j, pos[out[j]]);
+      }
+      pos[out[j]] = j;
+    }
+    if (moved || changed)
+      cout << " " << moved << " moved, " << changed << " changed" << std::endl;
+    ASSERT_LE(moved, 1);
+    ASSERT_LE(changed, 2);
+
+    // mark another osd out
+    weight[i] = 0;
+    prev = out;
+  }
+  }
+  cout << tchanged << " total changed" << std::endl;
+
+  delete c;
+}
+
+
+
+
+int main(int argc, char **argv) {
+  vector<const char*> args;
+  argv_to_vec(argc, (const char **)argv, args);
+
+  global_init(NULL, args, CEPH_ENTITY_TYPE_CLIENT, CODE_ENVIRONMENT_UTILITY, 0);
+  common_init_finish(g_ceph_context);
+
+  ::testing::InitGoogleTest(&argc, argv);
+  return RUN_ALL_TESTS();
+}