result from tiobench

It's quite strange that randomization affect writing speed. (20MBps in random vs. 60MBps in sequential)

The reading speed is extremely fast.

Run #1: /usr/bin/tiotest -t 8 -f 224 -r 500 -b 4096 -d . -TTT

Unit information

File size = megabytes
Blk Size = bytes
Rate = megabytes per second
CPU% = percentage of CPU used during the test
Latency = milliseconds
Lat% = percent of requests that took longer than X seconds
CPU Eff = Rate divided by CPU% - throughput per cpu load

Sequential Reads
File Blk Num Avg Maximum Lat% Lat% CPU
Identifier Size Size Thr Rate (CPU%) Latency Latency >2s >10s Eff

2.6.27-3-generic 1792 4096 1 345.76 70.62% 0.010 38.51 0.00000 0.00000 490
2.6.27-3-generic 1792 4096 2 ###### 383.0% 0.006 3.95 0.00000 0.00000 267
2.6.27-3-generic 1792 4096 4 912.80 670.1% 0.012 61.68 0.00000 0.00000 136
2.6.27-3-generic 1792 4096 8 ###### 1492.% 0.019 54.87 0.00000 0.00000 68

Random Reads
File Blk Num Avg Maximum Lat% Lat% CPU
Identifier Size Size Thr Rate (CPU%) Latency Latency >2s >10s Eff

2.6.27-3-generic 1792 4096 1 398.19 91.74% 0.008 0.14 0.00000 0.00000 434
2.6.27-3-generic 1792 4096 2 927.30 332.3% 0.007 0.15 0.00000 0.00000 279
2.6.27-3-generic 1792 4096 4 921.29 165.0% 0.011 8.41 0.00000 0.00000 558
2.6.27-3-generic 1792 4096 8 896.44 413.1% 0.009 4.52 0.00000 0.00000 217

Sequential Writes
File Blk Num Avg Maximum Lat% Lat% CPU
Identifier Size Size Thr Rate (CPU%) Latency Latency >2s >10s Eff

2.6.27-3-generic 1792 4096 1 63.06 38.86% 0.058 947.98 0.00000 0.00000 162
2.6.27-3-generic 1792 4096 2 64.82 92.02% 0.108 1082.81 0.00000 0.00000 70
2.6.27-3-generic 1792 4096 4 64.20 219.2% 0.227 1404.16 0.00000 0.00000 29
2.6.27-3-generic 1792 4096 8 61.38 389.0% 0.435 1603.03 0.00000 0.00000 16

Random Writes
File Blk Num Avg Maximum Lat% Lat% CPU
Identifier Size Size Thr Rate (CPU%) Latency Latency >2s >10s Eff

2.6.27-3-generic 1792 4096 1 25.81 15.20% 0.011 0.30 0.00000 0.00000 170
2.6.27-3-generic 1792 4096 2 16.44 30.29% 0.036 22.59 0.00000 0.00000 54
2.6.27-3-generic 1792 4096 4 22.20 62.51% 0.037 16.24 0.00000 0.00000 36
2.6.27-3-generic 1792 4096 8 21.54 65.08% 0.076 24.95 0.00000 0.00000 33

LewCPE

FYI, I can't find deb package for xdd.

LewCPE

From javaboom's comment and a web. I ran this code:


sudo dd if=/dev/zero of=./test.2G count=2048 bs=1M
sudo ./xdd.linux -op read -targets 1 ./test.2G -rwratio 100 -queuedepth 1 -blocksize 1024 -reqsize 128 -mbytes 2048 -passes 2 -verbose>out.txt


The outcome is as following:


IOIOIOIOIOIOIOIOIOIOI XDD version 6.5.013007.0001 IOIOIOIOIOIOIOIOIOIOIOI
xdd - I/O Performance Inc. Copyright 1992-2007
Starting time for this run, Mon Sep 22 20:03:18 2008

ID for this run, 'No ID Specified'
Maximum Process Priority, disabled
Passes, 2
Pass Delay in seconds, 0
Maximum Error Threshold, 0
Target Offset, 0
I/O Synchronization, 0
Total run-time limit in seconds, 0
Output file name, stdout
CSV output file name,
Error output file name, stderr
Pass seek randomization, disabled
File write synchronization, disabled
Pass synchronization barriers, enabled
Number of Targets, 1
Number of I/O Threads, 1

Computer Name, wason-ssd, User Name, wason
OS release and version, Linux 2.6.27-3-generic #1 SMP Wed Sep 10 16:02:00 UTC 2008
Machine hardware type, i686
Number of processors on this system, 1
Page size in bytes, 4096
Number of physical pages, 771607
Megabytes of physical memory, 3014
Seconds before starting, 0
Target[0] Q[0], ./test.2G
Target directory, "./"
Process ID, 10749
Thread ID, -1243030640
Processor, all/any
Read/write ratio, 100.00, 0.00
Throttle in MB/sec, 0.00
Per-pass time limit in seconds, 0
Blocksize in bytes, 1024
Request size, 128, blocks, 131072, bytes
Number of Requests, 16384
Start offset, 0
Number of MegaBytes, 2048
Pass Offset in blocks, 0
I/O memory buffer is a normal memory buffer
I/O memory buffer alignment in bytes, 4096
Data pattern in buffer, '0x00'
Data buffer verification is disabled.
Direct I/O, disabled
Seek pattern, sequential
Seek range, 1048576
Preallocation, 0
Queue Depth, 1
Timestamping, disabled
Delete file, disabled

                 T  Q       Bytes      Ops    Time      Rate      IOPS   Latency     %CPU  OP_Type    ReqSize     

TARGET PASS0001 0 1 2147483648 16384 0.806 2665.351 20335.01 0.0000 0.01 read 131072
TARGET PASS0002 0 1 2147483648 16384 0.782 2745.806 20948.83 0.0000 0.01 read 131072
TARGET Average 0 1 4294967296 32768 1.588 2704.980 20637.36 0.0000 0.01 read 131072
Combined 1 1 4294967296 32768 1.588 2704.980 20637.36 0.0000 0.01 read 131072
Ending time for this run, Mon Sep 22 20:03:20 2008

I anyone need others testing arguments, please tell me.

LewCPE