Support OFF-tas maps seem to generate a lot of garbage to insert... ! ?
I did a lot of caches distributed with cards support different landmarks. The results where partially positive (I was hoping that partitioned card support off-tas (splitting) would be almost as fast as a non split on bunch of support card). For different types of queries in reading and this turns out to be mostly true (some queries were slightly slower - probably because they when executed by partition).For insertions, it does however unfortunately quite seem to be another story - already when using a card of support of NIO no splitting inserts seem to generate a lot of waste slowing the reference down considerably and when to pass a plan to support NIO splitting this effect became so extreme that full GC took place more or less constantly on the nodes of the cache slows down execution down to almost a standstill :-(
Has anyone else tried this and seen the same results or one of the developers of consistency have a theory?
To me it seems like network-io for off-lot (using storage allocated using nio buffers just as the communication buffers!) should be at least also easy to achieve without generating excessive waste as for heap objects, but since I do not know the inner workings of consistency, I can't say with certainty if there is something that breaks this theory?
For me the main covered advantage through the use off-lot rather than on the heap was REDUCED activity GC and shorter breaks, but instead of this, it seems that the result is the opposite - at least by making insertions...
My example does not use (or need!) and secondary indexes (performs only the get/put/locking/unlocking) but each entry is locked before being inserted and unlocked after (this is necessary for the algorithm that I use as a benchmark) - as I mentioned in another thread, it is a shame that no 'lockAll' / unlockAll method calls are (my reference suffers a lot of all calls remote lock/unlock)-load for this, however, is nothing compared to the drop in performance that comes from the whole GC...
I tried to adjust the GC in several ways, but this has only to a very limited extent reduced the length of breaks GC or the frequency of full-CG - it seems to me that as a LOT of waste is generated for a reason any...
The setings which so far resulted in any GC-overhead (yet terribly wrong though!) are - XX: + UseParallelGC - XX: + UseAdaptiveSizePolicy. I use 1.6.0_14 coherence 3.5 GE and Sun JRE.
/ Magnus
Published by: MagnusE on August 10, 2009 15:01
Hi Magnus,
You have reached a bug we are working on currently: COH-2495. We will publish a patch when a fix is available.
In the meantime, you can avoid this problem by specifying
If you validate your configuration of nio memory manager, we can see him again. Kind regards David
Tags: Fusion Middleware
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