From 23bd04eae9b43a958334db7699227ceaca41db3d Mon Sep 17 00:00:00 2001
From: Tom Deakin <tom.deakin@bristol.ac.uk>
Date: Thu, 15 Feb 2018 04:07:01 +0000
Subject: [PATCH] Check sum with 2% error instead of abs error.

This seems to help validate single precision runs where the sum
is as close as we can expect for these large arrays.
---
 main.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/main.cpp b/main.cpp
index 4fd5125a..0dab86b8 100644
--- a/main.cpp
+++ b/main.cpp
@@ -425,10 +425,10 @@ void check_solution(const unsigned int ntimes, std::vector<T>& a, std::vector<T>
     std::cerr
       << "Validation failed on c[]. Average error " << errC
       << std::endl;
-  // Check sum to 8 decimal places
-  if (!triad_only && errSum > 1.0E-8)
+  // Check percentage error of sum. Should be within 2%.
+  if (!triad_only && errSum/goldSum > 2.0E-2)
     std::cerr
-      << "Validation failed on sum. Error " << errSum
+      << "Validation failed on sum. Percentage error " << errSum/goldSum * 100.0
       << std::endl << std::setprecision(15)
       << "Sum was " << sum << " but should be " << goldSum
       << std::endl;