Re: random-access I/O
Posted by:
Rick James
Date: February 03, 2012 11:08PM
Vadim's blog covers the speed of loading, with InnoDB doing the compressing. That does not cover the speed of reading, which is presumably more frequent. Also, it seemed like he changed the block size; I don't know how (if) this makes any performance difference during loading.
If the client compresses the blob(s), then the CPU effort is kept out of MySQL. This is likely to make better use of multi-core boxes (or separate server). I would _guess_ this might eliminate the speed degredation that he found.
Was your I/O test that was running at the same time you were loading the table? Was that test using _sequential_ I/O? What OS are you using? If linux, what elevator strategy is it set to? Do you have RAID?
No, I don't know exactly where I am headed with this discussion. I don't have a model that explains what you are seeing.
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