[Ocfs2-devel] some intersting result for ocfs2 performance

[Wim Coekaerts]

yeah right now, when you close the file, the stuff is flushed.

one think you should do is run the test but when you dod the reread,
make sure the files are not closed. have another process keep them open
or so.


On Fri, Jun 18, 2004 at 03:23:26PM +0800, Ling, Xiaofeng wrote:
> I made simple C program to test for the reading performance. see attach.
> The result are interesting.
> The program will open the file and repeat read(-p specified), each time
> the throughput is print out.
> 
> The first time read, the performance is low,it's reasonable, but after
> sleep 6 seconds, the next read 
> performance will also drop, and if only sleep 5 seconds, it won't.
> So, it looks like after 5 seconds, the cache will be thrown out, it that
> ture?
> 
> but compare with ext3 (the last data, 100 times), seems the cache in
> ocfs2 doesn't take effective at all.
> 
> run on svn 1122.
> =======================================================
> ./ben -f /ocfs/ttt -s 128 -a -p 10 --create
> 
> create file /ocfs/ttt of size 128K successfully
> total:128.000K Time:22.010 Rate:5816KB
> total:128.000K Time:11.952 Rate:10710KB
> total:128.000K Time:11.997 Rate:10669KB
> total:128.000K Time:12.055 Rate:10618KB
> total:128.000K Time:11.891 Rate:10764KB
> total:128.000K Time:11.996 Rate:10670KB
> total:128.000K Time:12.023 Rate:10646KB
> total:128.000K Time:11.907 Rate:10750KB
> total:128.000K Time:12.071 Rate:10604KB
> total:128.000K Time:12.000 Rate:10667KB
> total:1280.000K Time:130.101 Rate:9839KB
> 
> ./ben -f /ocfs/ttt -s 128 -a -p 10 --sleep 5
> 
> total:128.000K Time:20.667 Rate:6193KB
> total:128.000K Time:11.903 Rate:10754KB
> total:128.000K Time:12.011 Rate:10657KB
> total:128.000K Time:11.917 Rate:10741KB
> total:128.000K Time:8.272 Rate:15474KB
> total:128.000K Time:8.287 Rate:15446KB
> total:128.000K Time:12.124 Rate:10558KB
> total:128.000K Time:12.014 Rate:10654KB
> total:128.000K Time:11.953 Rate:10709KB
> total:128.000K Time:11.990 Rate:10676KB
> total:1280.000K Time:5121.921 Rate:250KB
> 
> ./ben -f /ocfs/ttt -s 128 -a -p 10 --sleep 6
> 
> total:128.000K Time:12.325 Rate:10385KB
> total:128.000K Time:11.925 Rate:10734KB
> total:128.000K Time:11.928 Rate:10731KB
> total:128.000K Time:11.966 Rate:10697KB
> total:128.000K Time:11.990 Rate:10676KB
> total:128.000K Time:12.065 Rate:10609KB
> total:128.000K Time:20.131 Rate:6358KB
> total:128.000K Time:11.980 Rate:10684KB
> total:128.000K Time:12.032 Rate:10638KB
> total:128.000K Time:11.907 Rate:10750KB
> total:1280.000K Time:6129.400 Rate:209KB
> 
> 
> --------------------------------
> for ext3
> 
> ./ben -f /ext3/ttt -s 128 -a -p 10 --create
> 
> create file /ocfs2/ttt of size 128K successfully
> total:128.000K Time:0.114 Rate:1122807KB
> total:128.000K Time:0.052 Rate:2461538KB
> total:128.000K Time:0.050 Rate:2560000KB
> total:128.000K Time:0.050 Rate:2560000KB
> total:128.000K Time:0.050 Rate:2560000KB
> total:128.000K Time:0.050 Rate:2560000KB
> total:128.000K Time:0.050 Rate:2560000KB
> total:128.000K Time:0.051 Rate:2509804KB
> total:128.000K Time:0.050 Rate:2560000KB
> total:128.000K Time:0.050 Rate:2560000KB
> total:1280.000K Time:0.654 Rate:1957187KB


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