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Top Forums UNIX for Beginners Questions & Answers Unstable output of FFSB (Filesystem benchmark) Post 302976091 by BHASKAR JUPUDI on Thursday 23rd of June 2016 08:01:31 PM
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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AUINFO(1)						      General Commands Manual							 AUINFO(1)

NAME
auinfo - show information about a Network Audio System server SYNOPSIS
auinfo [-audio servername] DESCRIPTION
The auinfo program provides information describing a Network Audio System server. It lists the capabilities of the server, the devices that are attached to it, the data formats that are accepted, and any predefined sounds that have been stored in the server. EXAMPLE
The following example shows the output produced by auinfo when connected to an NCD MCX(tm) display station: Audio Server: tcp/lemkemcx:8000 Version Number: 2.0 Vendor: Network Computing Devices Inc. Vendor Release: 3000 Min Sample Rate: 1000 Max Sample Rate: 52000 Max Tracks: 32 Number of Formats: 7 Formats: ULAW8 LinearUnsigned8 LinearSigned8 LinearSigned16MSB LinearUnsigned16MSB LinearSigned16LSB LinearUnsigned16LSB Number of Elem Types: 11 Element Types: ImportClient ImportDevice ImportBucket Bundle MultiplyConstant AddConstant Sum ExportClient ExportDevice ExportBucket ExportMonitor Number of Wave Forms: 0 Number of Actions: 2 Actions: ChangeState SendNotify Number of Devices: 5 Device 0: Changable: Gain LineMode ID: 0x34 Kind: PhysicalInput Use: Import Format: LinearSigned16MSB Num Tracks: 1 Access: Import List Description: "Mono Channel Input" Min Rate: 1000 Max Rate: 52000 Location: Left Right External Gain Percent: 15 Line Mode: High Device 1: Changable: Gain ID: 0x32 Kind: PhysicalOutput Use: Export Format: LinearSigned16MSB Num Tracks: 2 Access: Export List Description: "Stereo Channel Output" Min Rate: 1000 Max Rate: 52000 Location: Left Right External Gain Percent: 24 Num Children: 2 Children: 0x30 0x31 Device 2: Changable: Gain ID: 0x33 Kind: PhysicalOutput Use: Export Format: LinearSigned16MSB Num Tracks: 1 Access: Export List Description: "Mono Channel Output" Min Rate: 1000 Max Rate: 52000 Location: Left Right External Gain Percent: 24 Num Children: 2 Children: 0x30 0x31 Device 3: Changable: Gain ID: 0x31 Kind: PhysicalOutput Use: Export Format: LinearSigned16MSB Num Tracks: 1 Access: Export List Description: "Right Channel Output" Min Rate: 1000 Max Rate: 52000 Location: Right External Gain Percent: 24 Num Children: 0 Device 4: Changable: Gain ID: 0x30 Kind: PhysicalOutput Use: Export Format: LinearSigned16MSB Num Tracks: 1 Access: Export List Description: "Left Channel Output" Min Rate: 1000 Max Rate: 52000 Location: Left External Gain Percent: 24 Num Children: 0 Number of Buckets: 0 Bucket 0: ID: 0x1400008 Kind: Bucket Use: Import Export Format: ULAW8 Num Tracks: 1 Access: Import Export Destroy List Description: "Monty Python - Australian Table Wines" Sample Rate: 8000 Num Samples: 697944 Bucket 1: ID: 0x1400007 Kind: Bucket Use: Import Export Format: LinearUnsigned8 Num Tracks: 1 Access: Import Export Destroy List Description: ""I'm sorry Dave, I can't do that" - HAL from 2001" Sample Rate: 22255 Num Samples: 85504 Bucket 2: ID: 0x1400006 Kind: Bucket Use: Import Export Format: LinearUnsigned8 Num Tracks: 1 Access: Import Export Destroy List Description: ""He's dead, Jim" - Dr. McCoy" Sample Rate: 11128 Num Samples: 31602 ENVIRONMENT
AUDIOSERVER This variable specifies the default audio server to contact if -audio is not specified on the command line. DISPLAY If AUDIOSERVER is not set, this variable is examined to find the name of the corresponding X Window System display. SEE ALSO
nas(1) COPYRIGHT
Copyright 1993, 1994 Network Computing Devices, Inc. See nas(1) for a full statement of rights and permissions. AUTHOR
Jim Fulton, Network Computing Devices, Inc. 1.9.3 AUINFO(1)
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