[Ocfs2-users] OCFS2 benchmark slow concurrent write

[Sunil Mushran]

Did you try using a gige interconnect?

Philipp Wehrheim wrote:
> Hi everbody,
>
> I've just created a test setup for my company with two pc's drbd (0.8.3)
> primary/primary mode with OCFS2 on top of it. the pc's are running suse
> 10.2 with kernel 2.6.21.2. the Hardware CPU ~1GHz ~12 MBRam and one NIC
> (100Mbit).
>
> The setup is working quite stable and so I started to make some
> benchmarks and received some strange results:
>
> For the benchmark I used a small C-prog "iotest" that, in a loop, open a
> file write on line and closes the file again.
>
> ---
> #define LOOPCOUNT 1050620
> ...
>   for (i=0; i<LOOPCOUNT; i++) {
>     if ( (logFD = open (LOGFILE, O_WRONLY|O_CREAT|O_APPEND, 0666)) !=
> -1) {
>       write (logFD, logMSG, logLEN);
>       close (logFD);
>   }
> ---
>
>
> 1. write to a ext3-fs
>
> 	| per line 	  | for 1050620 lines |
> hobbes  | 44 nanoseconds  | 47.1 seconds      |
> struppi | 37 nanoseconds  | 39.3 seconds      |
>
>
> 2. write to a OCFS2-fs single -> only one maschiene at the time
>
> 	| per line 	  | for 1050620 lines |
> hobbes  | 84 nanoseconds  | 88.3 seconds      |
> struppi | 47 nanoseconds  | 50.1 seconds      |
>
>
> 3. write to a OCFS2-fs into _ONE_ file -> concurrent write from both pcs
>
> 	| per line 	   | for 1050620 lines |
> hobbes  | 113 milliseconds | 119764 seconds    | yes over 33h
> struppi | 113 milliseconds | 119764 seconds    |
>
>
> 4. write to a OCFS2-fs into two files -> each pc into one file
>
> 	| per line 	  | for 1050620 lines |
> hobbes  | 93,6 nanoseconds  | 98.6 seconds    |
> struppi | 59,5 nanoseconds  | 62.6 seconds    |
>
>
> So as one can see OCFS2 does quite good but when it comes to concurrent
> writes into one file it is sloooooowwwwwwww.
> The question is now:
>
> - is there an error in my setup
> - how can i tune ocfs2
> - how can i tune dlm
> - WHERE IS THE OCFS2 DOCU???(no im not talking about colorful powerpoint slides)
>
> Thanks in advance
> Philipp
>
>
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