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Postmark results from ordered/writeback mode



> > Agreed, and for most workloads data=ordered will have very little
> > performance difference from data=writeback.
> 
> Yup.  I agree with you both.  My primary motivation for using that
> option was so that I could test them all.  Since this partition gets
> very little r/w usage, and that is quite controlled, I thought
> writeback would be ok as a test.
> 
> Sean

I ran Postmark (http://www.netapp.com/tech_library/3022.html) which is a
benchmark by Netapp to demonstrate fs performance in ephermeal small
files. 

Hardware: P3-450/256MB with 2 20GB IDE disks attached to a 3ware
Escalade 6200 in RAID-1 configuration

Postmark ran on local filesystems. Ext3 partition was 4 GB ext2
partition was 4.5GB

a) Ext3 Writeback mode
b) Ext3 Ordered mode
c) Ext2

Parameters used for postmark were

set size 1024 20480
set subdirectories 100
set number 5000
set transactions 50000
set read 8192
set write 8192
set bias read 10
set bias create 5

In this workload, ordered mode is much slower than writeback

-- 
Yusuf Goolamabbas
yusufg outblaze com
Time:
        25 seconds total
        22 seconds of transactions (2272 per second)

Files:
        30096 created (1203 per second)
                Creation alone: 5000 files (1666 per second)
                Mixed with transactions: 25096 files (1140 per second)
        50000 read (2272 per second)
        0 appended (0 per second)
        30096 deleted (1203 per second)
                Deletion alone: 5192 files (5192 per second)
                Mixed with transactions: 24904 files (1132 per second)

Data:
        515.13 megabytes read (20.61 megabytes per second)
        309.24 megabytes written (12.37 megabytes per second)

Time:
        54 seconds total
        52 seconds of transactions (961 per second)

Files:
        30096 created (557 per second)
                Creation alone: 5000 files (5000 per second)
                Mixed with transactions: 25096 files (482 per second)
        50000 read (961 per second)
        0 appended (0 per second)
        30096 deleted (557 per second)
                Deletion alone: 5192 files (5192 per second)
                Mixed with transactions: 24904 files (478 per second)

Data:
        515.13 megabytes read (9.54 megabytes per second)
        309.24 megabytes written (5.73 megabytes per second)

Creating subdirectories...Done
Time:
        18 seconds total
        17 seconds of transactions (2941 per second)

Files:
        30096 created (1672 per second)
                Creation alone: 5000 files (5000 per second)
                Mixed with transactions: 25096 files (1476 per second)
        50000 read (2941 per second)
        0 appended (0 per second)
        30096 deleted (1672 per second)
                Deletion alone: 5192 files (5192 per second)
                Mixed with transactions: 24904 files (1464 per second)

Data:
        515.13 megabytes read (28.62 megabytes per second)
        309.24 megabytes written (17.18 megabytes per second)
pm>


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