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Monday, 17 November, 2014

MySQL Performance: 5.7 and RDS Aurora, so what?.. ;-)

It was very fun for me to read last week the announces about RDS Aurora - specially the parts related to its performance gain over MySQL: Aurora is claimed to show x5 times better performance than MySQL! However, without publishing any details about ;-) -- and the only details I was able to find until now and group together are the following:

  • Aurora is a proprietary closed source database engine, "compatible" with MySQL (so, not an improved MySQL fork, as many expected..)
  • Sysbench workloads were used to evaluate Aurora performance
  • the only currently published Sysbench results are the following:
    • 500K SELECT/sec
    • 100K UPDATE/sec
  • again, no details about any of the tests..
  • in some articles instead of UPDATE/sec performance was mentioned INSERT/sec, but keeping in mind that there is simply no pure INSERT test available by default within Sysbench workloads, I may only suppose the mentioned 100K writes/sec are corresponding to the UPDATE/sec performance..

Fine then. But, so what?..

Let's see now where we are with MySQL Performance for today?.. ;-))

Yet more than a year ago we already announced 500K SELECT/sec with MySQL 5.7 on Sysbench (and you may read a full story about, if you got it missed). And this year during MySQL Central @OpenWorld we already presented 645K SELECT/sec with the latest MySQL 5.7! - here are the graphs taken from a live load just this morning :
  • the first graphs is showing the SELECT/sec level
  • the second graph - the corresponding amount of concurrent users (sessions) starting with 8, then 16, 32, 64, 128, 256 users

Sysbench SELECT Performance @MySQL 5.7 :

This is a single MySQL instance running on a single HW server. And as you see, we're reaching 645K SELECT/sec since 128 concurrent users. Is the 645K QPS level is the max limit for this server?.. - of course not, it should be possible to do yet more better here by improving our SQL layer, because on the same HW we're able to reach 1M QPS via InnoDB Memcached plugin (where all the data are going the same way directly from InnoDB, but bypassing all the SQL layers).. Work in progress ;-))

Then, what about UPDATE/sec performance?..

Again, a single HW server, single MySQL 5.7 instance, few simple SSD disks (even not a super fast flash storage as we have from Fusion-io and LSI in our LAB) :
  • the first graphs is showing the UPDATE/sec level
  • the second graph - the corresponding amount of concurrent users (sessions) starting with 8, then 16, 32, 64, 128, 256 users

Sysbench UPDATE Performance @MySQL 5.7 :

As you can see, we're doing even slightly more than 100K UPDATE/sec here ;-)

And you may ask then: Why MySQL Team @Oracle did not publish such a great result on UPDATE performance?.. - Well, just because there is nothing to be proud of for the moment.. ;-)) Of course, if you'll run the same workload on HDD storage you'll get much more worse results (for ex. on this server with HDD I have only 2K UPDATE/sec).. - so, for sure, SSD is much more efficient for random I/O writes. However, we're not doing better when using a much more faster flash storage than SSD, and this is our main headache today for all IO-bound workloads ;-) -- the limit today is still in the MySQL/InnoDB code itself.. - and we know where, and we're working hard to get it fixed.. And once this stuff will be improved, then we'll have something to be proud of, and then you'll hear about us for sure ;-))

Now, looking back to RDS Aurora results on Sysbench.. - so, what?.. MySQL 5.7 is already doing better! ;-)

Well, still looking for claimed x5 times performance difference..

(NOTE: if you have any troubles to reach over 500K SELECT/sec or 100K UPDATE/sec on MySQL 5.7, I have a webinar right this Wednesday to tell you all about MySQL/InnoDB internals and related tuning, don't hesitate to join: http://www.mysql.com/news-and-events/web-seminars/tuning-and-best-practices-for-developers-and-dbas/)

Posted by Dimitri at 16:40 - Comments...
Categories: MySQL