The HttpSessionStore is an in memory session store, so it has no disk writing
bottleneck. It does however have some other problems, specifically with the
back button i think.
the terracotta page store works like this:
protected ISessionStore newSessionStore()
{
return new SecondLevelCacheSessionStore(this, new
TerracottaPageStore(100));
}
as it is just an implementation of the IPageStore interface as is the
DiskPageStore, but where the DiskPageStore writes to disk the
TerracottaPageStore writes to http session.
The 100 is number of pages to keep in history as far as i remember, check
the source to be sure.
Ard Schrijvers-3 wrote:
>
>
>> but serialization and writing to disk are 2 different things.
>
> Yes sorry for the confusion. I intertwine the serialization and disk
> performance (hence asking whether a memory page store exists) because
> AFAIU, it is the serialized pagemaps that are being written to
> filesystem. Indeed, when using a memory page store, still serialization
> to memory is needed, so you are indeed right to say that they are
> different. I should talk about the cpu bottleneck of writing the
> serialized pagemaps to disk and whether there is a pagestore using
> memory. As indicated by Richard, this one seems to exist in Terracotta.
> I will try and see whether this avoids my experienced cpu bottleneck.
> Also the virus scanner option I will look into
>
> By the way, using
>
> protected ISessionStore newSessionStore()
> {
> return new HttpSessionStore(this);
> }
>
> Instead of
>
> protected ISessionStore newSessionStore()
> {
> return new SecondLevelCacheSessionStore(this, new
> DiskPageStore());
> }
>
> Also avoids the disk writing bottleneck. Now, I am not sure whether
> HttpSessionStore can be used instead of SecondLevelCacheSessionStore. It
> does not seem to write to diks.
>
> Thanks for all the pointers and fast responses everybody
>
> Regards Ard
>
>>
>>
>>
>> On Tue, Oct 7, 2008 at 4:21 PM, Ard Schrijvers
>> <[EMAIL PROTECTED]>wrote:
>>
>> > Hello Igor and Timo,
>> >
>> > Sorry for my really way to late response, I was caught up
>> entirely by
>> > some stressful tasks which needed to be finished.
>> >
>> > I currently do not have statistics, but I could have a cpu yourkit
>> > snapshot. I have seen up to 75% cpu in the serialization and
>> > deserialization. Recently I saw 25%.
>> >
>> > People working with Linux do not experience this cpu bottleneck
>> > though, so it might very well be an issue with how windows
>> handles the
>> > filesystem. I will sort out the suggestion by Timo, would
>> be great if
>> > that solved the issue.
>> >
>> > Thanks a lot, and again, sorry for my late response!
>> >
>> > -Ard
>> >
>> > >
>> > > On Fri, 03 Oct 2008, Igor Vaynberg wrote:
>> > > > do you have some statistics for us? or some profiler timing
>> > > screenshots?
>> > >
>> > > While waiting for the reply from Ard... I remember
>> hearing of a case
>> > > where the pagemaps were stored to a directory that the
>> virus scanner
>> > > was monitoring, and the scanner hogged all cpu during
>> load testing
>> > > :) I suppose that this kind of stuff happens more easily
>> on Windows
>> > > than on unices.
>> > >
>> > > Best wishes,
>> > > Timo
>> > >
>> > > --
>> > > Timo Rantalaiho
>> > > Reaktor Innovations Oy <URL: http://www.ri.fi/ >
>> > >
>> > >
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>> > >
>> > >
>> >
>> >
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>> >
>>
>
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>
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http://www.richard-wilkinson.co.uk
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