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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ost::Number(3)						     Library Functions Manual						    ost::Number(3)

NAME
ost::Number - A number manipulation class. SYNOPSIS
#include <numbers.h> Inherited by ost::DateNumber, and ost::ZNumber. Public Member Functions Number (char *buffer, unsigned size) Create an instance of a number. void setValue (long value) const char * getBuffer () const long getValue () const long operator() () operator long () operator char * () long operator= (const long value) long operator+= (const long value) long operator-= (const long value) long operator-- () long operator++ () int operator== (const Number &num) int operator!= (const Number &num) int operator< (const Number &num) int operator<= (const Number &num) int operator> (const Number &num) int operator>= (const Number &num) Protected Attributes char * buffer unsigned size Friends long operator+ (const Number &num, const long val) long operator+ (const long val, const Number &num) long operator- (const Number &num, long val) long operator- (const long val, const Number &num) Detailed Description A number manipulation class. This is used to extract, convert, and manage simple numbers that are represented in C ascii strings in a very quick and optimal way. Author: David Sugar dyfet@ostel.com number manipulation. Constructor &; Destructor Documentation ost::Number::Number (char *buffer, unsignedsize) Create an instance of a number. Parameters: buffer or NULL if created internally. size use - values for zero filled. Member Function Documentation const char* ost::Number::getBuffer () const [inline] long ost::Number::getValue () const ost::Number::operator char * () [inline] ost::Number::operator long () [inline] int ost::Number::operator!= (const Number &num) long ost::Number::operator() () [inline] long ost::Number::operator++ () long ost::Number::operator+= (const longvalue) long ost::Number::operator-- () long ost::Number::operator-= (const longvalue) int ost::Number::operator< (const Number &num) int ost::Number::operator<= (const Number &num) long ost::Number::operator= (const longvalue) Reimplemented in ost::ZNumber. int ost::Number::operator== (const Number &num) int ost::Number::operator> (const Number &num) int ost::Number::operator>= (const Number &num) void ost::Number::setValue (longvalue) Reimplemented in ost::ZNumber. Friends And Related Function Documentation long operator+ (const Number &num, const longval) [friend] long operator+ (const longval, const Number &num) [friend] long operator- (const Number &num, longval) [friend] long operator- (const longval, const Number &num) [friend] Member Data Documentation char* ost::Number::buffer [protected] unsigned ost::Number::size [protected] Author Generated automatically by Doxygen for GNU CommonC++ from the source code. GNU CommonC++ Sat Jun 23 2012 ost::Number(3)