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[loba.git] / deployment.cpp

diff --git a/deployment.cpp b/deployment.cpp
index 2befb00bb9b7af1d506fcc6c07178490fea8885f..f34c3a93e36803b7b2ee0c930cfd1deb5c88ee4c 100644 (file)
--- a/deployment.cpp
+++ b/deployment.cpp
@@ -1,4 +1,5 @@
 #include <algorithm>
+#include <cmath>
 #include <cstdlib>
 #include <functional>
 #include <iomanip>
@@ -64,34 +65,29 @@ void deployment_generator::distribute_load()
     std::transform(loads.begin(), loads.end(), loads.begin(),
                    std::bind(std::multiplies<double>(), _1, factor));
     if (opt::integer_transfer) {
-        // round the loads
-        std::vector<double> iloads(hosts.size());
-        std::transform(loads.begin(), loads.end(), iloads.begin(), round);
-        // compute the differences between each load and its rounded value
-        std::vector<double> diffs(hosts.size());
-        std::transform(loads.begin(), loads.end(), iloads.begin(),
-                       diffs.begin(), std::minus<double>());
-        // compute the absolute values of the diffs
-        std::vector<double> adiffs(hosts.size());
-        std::transform(diffs.begin(), diffs.end(), adiffs.begin(), fabs);
-        // find i, index of the element farthest from its rounded value
+        double iload;
+        double residue = 0.0;
         unsigned i;
-        i = std::max_element(adiffs.begin(), adiffs.end()) - adiffs.begin();
-        // remove element i from diffs, and compute the residual part...
-        diffs[i] = diffs.back();
-        diffs.pop_back();
-        double residue = std::accumulate(diffs.begin(), diffs.end(), 0.0);
-        // ... and compute element i (rounded to avoid numerical errors)
-        iloads[i] = fabs(round(loads[i] + residue));
+        for (i = 0 ; i < hosts.size() - 1; ++i) {
+            if (residue < 0.0)
+                iload = std::floor(loads[i]);
+            else if (residue > 0.0)
+                iload = std::ceil(loads[i]);
+            else // residue == 0.0
+                iload = std::round(loads[i]);
+            residue += (loads[i] - iload);
+            loads[i] = iload;
+        }
+        // abs(round(...)) to avoid rounding errors, or a value of -0
+        // Note: i == hosts.size() - 1
+        iload = std::abs(std::round(loads[i] + residue));
+        loads[i] = iload;
         // final sanity check
         xbt_assert(opt::auto_depl::load ==
-                   std::accumulate(iloads.begin(), iloads.end(), 0.0));
-        for (unsigned i = 0 ; i < hosts.size() ; ++i)
-            set_load(i, iloads[i]);
-    } else {
-        for (unsigned i = 0 ; i < hosts.size() ; ++i)
-            set_load(i, loads[i]);
+                   std::accumulate(loads.begin(), loads.end(), 0.0));
     }
+    for (unsigned i = 0 ; i < hosts.size() ; ++i)
+        set_load(i, loads[i]);
 }
 
 void deployment_generator::deploy()
@@ -186,7 +182,7 @@ void deployment_torus::generate()
             b = c;
     }
     unsigned width = b;
-    // here width == ceil(sqrt(size))
+    // here width == std::ceil(std::sqrt(size))
 
     unsigned first_on_last_line = (size() - 1) - (size() - 1) % width;
     XBT_DEBUG("torus size = %zu ; width = %u ; height = %zu ; foll = %u",