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commit 8e05a017af74642068b56cadec25f93ebbf75dad
Author: Mark Thomas <ma...@apache.org>
AuthorDate: Mon Jan 8 12:11:41 2024 +0000

    Update the docs for running the tests
---
 BUILDING.txt | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/BUILDING.txt b/BUILDING.txt
index 0acef652a1..d4e248b7b0 100644
--- a/BUILDING.txt
+++ b/BUILDING.txt
@@ -492,9 +492,20 @@ NOTE: Cobertura is licensed under GPL v2 with parts of it 
being under
     (such as a developer may use day to day) assuming no other resource hungry
     processes are running.
 
-    These assumptions are not always true (e.g. on CI systems running in a
-    virtual machine) so the performance tests may be deactivated by using the
-    following property:
+    Performance tests may be an absolute test (how long to complete a number
+    of iterations of an operation or set of operations) or may be a relative
+    test (how long two or more different approaches take to generate the same
+    result). The absolute tests may be destructive in that they run until the
+    system runs out of resources.
+
+    Where there is no benefit in running an absolute performance test as part
+    of a standard test run, the test will be excluded by naming it
+    Tester*Performance.java.
+
+    The relative tests are included as part of a standard test run however,
+    where the assumptions made about host capabilities are  not true (e.g. on
+    CI systems running in virtual machine) the tests may be deactivated by
+    using the following property:
 
         test.excludePerformance=true
 


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