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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NAMEBENCH(1)															      NAMEBENCH(1)

NAME
namebench - open-source DNS benchmark utility SYNOPSIS
namebench [nameserver1 ... [nameserverN]] DESCRIPTION
namebench searches the fastest DNS servers available for your computer to use. namebench runs a fair and thorough benchmark using your web browser history, tcpdump output, or standardized datasets in order to provide an individualized recommendation. OPTIONS
This program follows the usual GNU command line syntax, with long options starting with two dashes (-). A summary of options is included below. For a complete description, see the README file or visit the project's website. -h, --help Show summary of options. -r RUN_COUNT, --runs=RUN_COUNT Number of test runs to perform on each nameserver. -z CONFIG, --config=CONFIG Configuration file to use. -o OUTPUT_FILE, --output=OUTPUT_FILE Filename to write output to. -t TEMPLATE, --template=TEMPLATE Template to use for output generation (ascii, html, resolv.conf). -c CSV_FILE, --csv_output=CSV_FILE Filename to write query details to (CSV). -j HEALTH_THREAD_COUNT, --threads=HEALTH_THREAD_COUNT Number of health check threads to use. -J BENCHMARK_THREAD_COUNT, --threads=BENCHMARK_THREAD_COUNT Number of benchmark threads to use. -P PING_TIMEOUT, --ping_timeout=PING_TIMEOUT Number of seconds ping requests timeout in. -y TIMEOUT, --timeout=TIMEOUT Number of seconds general requests timeout in. -Y HEALTH_TIMEOUT, --health_timeout=HEALTH_TIMEOUT Health check timeout (in seconds). -i INPUT_SOURCE, --import=INPUT_SOURCE Import hostnames from an filename or application (alexa, cachehit, cachemiss, cachemix, camino, chrome, chromium, epiphany, firefox, flock, galeon, icab, internet_explorer, konqueror, midori, omniweb, opera, safari, seamonkey, squid, sunrise). -I, --invalidate_cache Force health cache to be invalidated. -q QUERY_COUNT, --tests=QUERY_COUNT Number of queries per run. -m SELECT_MODE, --select_mode=SELECT_MODE Selection algorithm to use (weighted, random, chunk). -s NUM_SERVERS, --num_servers=NUM_SERVERS Number of nameservers to include in test. -S, --system_only Only test the currently configured system nameservers. -w, --open_webbrowser Opens the final report in your browser. -u, --upload_results Upload anonmyized results to SITE_URL (default: False). -U SITE_URL, --site_url=SITE_URL URL to upload results to (default: http://namebench.appspot.com/). -H, --hide_results Upload results, but keep them hidden from indexes. -x, --no_gui Disable GUI. -C, --enable-censorship-checks Enable censorship checks. -6, --ipv6_only Only include IPv6 name servers. -O, --only Only test nameservers passed as arguments. COPYRIGHT
This manual page was written by Miguel Landaeta <miguel@miguel.cc> for the Debian system (but may be used by others). Permission is granted to copy, distribute and/or modify this document under the terms of the terms of GNU General Public License, Version 2 or any later version published by the Free Software Foundation. On Debian systems, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL. SEE ALSO
dig(1), host(1). AUTHOR
Thomas Stromberg <tstromberg@google.com> 2010-11-20 NAMEBENCH(1)