Hi Stefan,
It can be related with VM. Sedna uses fsync() to guarantee that data has
been actually written after checkpoint. Performance vary depending on OS,
fs, fs settings, etc. On some systems we observed strange behavior.
I've added additional logs which could help us to determine if the problem
is caused by fsync perfromance.
Please, download the latest development build (it's stable and compatible
with release 3.5.101):
http://modis.ispras.ru/FTPContent/sedna/development/
Start se_gov with "-el-level 4" and run your workload. We need to collect
some "slow" and "fast" checkpoints in event logs.
Ivan Shcheklein,
Sedna Team
Hi,
>
> we've experienced a strange behaviour of the checkpoint procedure.
> It did occur in 3.466 and occurs in the new 3.5 Version.
>
> Server is debian squeeze running in a xen vm. If you do a import,
> sometimes sendas checkpoint procedure takes 15-40 minutes.
> After crashes sometimes it takes so long too, but that might be related
> to the crash.
>
> This is not normal and it occurs only sometimes. Normally a import does
> take 3-4 minutes. There are some cases where the import is really slow
> too (not the checkpoint procedure which starts at the end of the import).
> Because of this we've organized a windows server (32 bit) and this
> behaviour never occurs there. In our development envorinment (windows
> 64 bit) this never occured too.
> But sometimes it just behaves strange and is really slow. Deleting
> everything and build it from scratch helps. We've tested the prebuild
> version and build it by ourselves.
>
> I've tested a bit on a centos machine which is not running in a vm. I
> couldn't reproduce the problem until now, but it that might just be luck
> or coincidence.
> In general sedna seems to be slower on linux machines, especially when
> there is large chunk of updates (emails from mutliple users that are
> linked to several XML elements).
>
> Problem is we can't reproduce it (the slow checkpoint procedures issue).
> Is anybody running sedna in a VM and has experienced anything similar?
> Perhaps this is related to the VM.
> On windows it runs fine.
>
>
> Greetings
>
>
>
>
>
>
>
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