Dennis Huo created MAPREDUCE-6931:
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Summary: Fix TestDFSIO "Total Throughput" calculation
Key: MAPREDUCE-6931
URL: https://issues.apache.org/jira/browse/MAPREDUCE-6931
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: benchmarks, test
Affects Versions: 2.8.0
Reporter: Dennis Huo
Priority: Trivial
The new "Total Throughput" line added in
https://issues.apache.org/jira/browse/HDFS-9153 is currently calculated as
{{toMB(size) / ((float)execTime)}} and claims to be in units of "MB/s", but
{{execTime}} is in milliseconds; thus, the reported number is 1/1000x the
actual value:
{code:java}
String resultLines[] = {
"----- TestDFSIO ----- : " + testType,
" Date & time: " + new Date(System.currentTimeMillis()),
" Number of files: " + tasks,
" Total MBytes processed: " + df.format(toMB(size)),
" Throughput mb/sec: " + df.format(size * 1000.0 / (time * MEGA)),
"Total Throughput mb/sec: " + df.format(toMB(size) / ((float)execTime)),
" Average IO rate mb/sec: " + df.format(med),
" IO rate std deviation: " + df.format(stdDev),
" Test exec time sec: " + df.format((float)execTime / 1000),
"" };
{code}
The different calculated fields can also use toMB and a shared
milliseconds-to-seconds conversion to make it easier to keep units consistent.
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