From fc4b169f4e9a3b0e8c8ae807fdb4c7cf8d3e6507 Mon Sep 17 00:00:00 2001
From: Arnaud Giersch <arnaud.giersch@iut-bm.univ-fcomte.fr>
Date: Tue, 27 Sep 2011 10:26:42 +0200
Subject: [PATCH 1/1] Add support for a constant random, for testing.

---
 deployment.cpp | 8 ++++++--
 options.cpp    | 9 ++++++---
 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/deployment.cpp b/deployment.cpp
index f34c3a9..bbb47e5 100644
--- a/deployment.cpp
+++ b/deployment.cpp
@@ -57,9 +57,13 @@ void deployment_generator::distribute_load()
         set_load(0, opt::auto_depl::load);
         return;
     }
-    srand48(opt::auto_depl::random_seed);
     std::vector<double> loads(hosts.size());
-    std::generate(loads.begin(), loads.end(), drand48);
+    if (opt::auto_depl::random_seed != 1) {
+        srand48(opt::auto_depl::random_seed);
+        std::generate(loads.begin(), loads.end(), drand48);
+    } else {
+        std::fill(loads.begin(), loads.end(), 1.0);
+    }
     double factor = opt::auto_depl::load /
         std::accumulate(loads.begin(), loads.end(), 0.0);
     std::transform(loads.begin(), loads.end(), loads.begin(),
diff --git a/options.cpp b/options.cpp
index a943339..c5f5c29 100644
--- a/options.cpp
+++ b/options.cpp
@@ -398,8 +398,8 @@ void opt::print()
             DESCR("- initial load (total)", "%g", auto_depl::load);
         DESCR("- random initial load distribution", "%s",
               h.on_off(auto_depl::random_distribution));
-        DESCR("- random seed", "%s",
-              h.val_or_string(auto_depl::random_seed, "time based"));
+        DESCR("- random seed", "%s", // NOTE: cannot be 0 here anymore
+              h.val_or_string(auto_depl::random_seed, "constant random", 1UL));
     } else {
         DESCR("deployment file", "\"%s\"", deployment_file.c_str());
     }
@@ -483,8 +483,11 @@ void opt::usage()
               << " [" << opt_helper::on_off(opt::auto_depl::random_distribution)
               << "]\n";
     std::clog << o("-r value")
-              << "random seed, 0 for a seed based on current date"
+              << "random seed for initial load distribution, or 0, or 1"
               << " [" << opt::auto_depl::random_seed << "]\n";
+    if (opt::help_requested > 1)
+        std::clog << o("") << "- use 0 for a seed based on current date\n"
+                  << o("") << "- use 1 for a constant random\n";
 
     std::clog << "\nLoad balancing algorithm:\n";
     std::clog << o("-a name") << "load balancing algorithm"
-- 
2.39.5