Round total memory b/c it can differ slightly on the same machine

conbench/machine_info.py

@@ -97,12 +97,20 @@ def machine_info(host_name):
         except ValueError:
             info[key] = 0
 
+    info["memory_bytes"] = _round_memory(int(info["memory_bytes"]))
+
     for key in info:
         info[key] = str(info[key])
 
     return info
 
 
+def _round_memory(value):
+    # B -> GiB -> B
+    gigs = 1024 ** 3
+    return int("{:.0f}".format(value / gigs)) * gigs
+
+
 def _commands(info):
     for key, command in COMMANDS.items():
         try:

conbench/tests/benchmark/test_machine_info.py

@@ -1,4 +1,9 @@
-from ...machine_info import _fill_from_cpuinfo, _fill_from_lscpu, _fill_from_meminfo
+from ...machine_info import (
+    _fill_from_cpuinfo,
+    _fill_from_lscpu,
+    _fill_from_meminfo,
+    _round_memory,
+)
 
 
 L1D_CACHE = 524288
@@ -334,3 +339,13 @@ def test_fill_order():
         "cpu_l3_cache_bytes": L3_CACHE,
         "cpu_frequency_max_hz": FREQUENCY,
     }
+
+
+def test_round_memory():
+    before = [131590280000, 131593068000, 131593872000]
+    after = [132070244352, 132070244352, 132070244352]
+    assert list(map(_round_memory, before)) == after
+
+    before = [15855024000, 15855036000, 15855040000]
+    after = [16106127360, 16106127360, 16106127360]
+    assert list(map(_round_memory, before)) == after