Unstable output of FFSB (Filesystem benchmark)


 
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Old 06-23-2016
Unstable output of FFSB (Filesystem benchmark)

I'm trying to benchmark a RAID-6 server using FFSB and the result is really unstable to detect the pattern.

Scenario -1:

Block-size - 65536 (64KB)
Number of threads - 10
Number of files - 10
Min and Max filesize - 400m
Read size - 400m
Direct IO - on
Random-read=off


Read throughput - 420MB/s (This is expected)


Scenario - 2:

Block-size - 65537 (64KB + 1 Byte)
Number of threads - 10
Number of files - 10
Min and Max filesize - 400m
Read size - 400m
Direct IO - on
Random-read=off

Read throughput - 30GB/s (this is not)


Can anyone explain this behaviour?
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SEIVOTS-SUMMARY(1)					      General Commands Manual						SEIVOTS-SUMMARY(1)

NAME
seivots-summary - summarize seivot output files SYNOPSIS
seivots-summary [--config=FILE] [--dump-config] [--dump-memory-profile=METHOD] [--dump-setting-names] [--generate-manpage=TEMPLATE] [-h] [--help] [--list-config-files] [--log=FILE] [--log-keep=N] [--log-level=LEVEL] [--log-max=SIZE] [--log-mode=MODE] [--no-default-configs] [--output=FILE] [--version] [FILE]... DESCRIPTION
seivots-summary reads some benchmark result files created by summain(1), and produces summaries of them in tabular form, making it easy to compare results from different benchmark runs. OPTIONS
--config=FILE add FILE to config files --dump-config write out the entire current configuration --dump-memory-profile=METHOD make memory profiling dumps using METHOD, which is one of: none, simple, meliae, or heapy (default: simple) --dump-setting-names write out all names of settings and quit --generate-manpage=TEMPLATE fill in manual page TEMPLATE -h, --help show this help message and exit --list-config-files list all possible config files --log=FILE write log entries to FILE (default is to not write log files at all); use "syslog" to log to system log, or "none" to disable log- ging --log-keep=N keep last N logs (10) --log-level=LEVEL log at LEVEL, one of debug, info, warning, error, critical, fatal (default: debug) --log-max=SIZE rotate logs larger than SIZE, zero for never (default: 0) --log-mode=MODE set permissions of new log files to MODE (octal; default 0600) --no-default-configs clear list of configuration files to read --output=FILE write output to FILE, instead of standard output --version show program's version number and exit EXAMPLE
To summarize all benchmark files: seivots-summary $HOME/obnam/benchmarks/*/*.seivot | less -S SEE ALSO
seivot(1), obnam(1). SEIVOTS-SUMMARY(1)