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Displaying posts with tag: DoubleWrite (reset)
MySQL Performance : 8.0 on IO-bound OLTP_RW vs Percona Server 5.7

This article is inspired by Percona blog post comparing MySQL 8.0 and Percona Server 5.7 on IO-bound workload with Intel Optane storage. There are several claims made by Vadim based on a single test case, which is simply unfair. So, I'll try to clarify this all based on more test results and more tech details..
But before we start, some intro :
InnoDB Parallel Flushing -- was introduced with MySQL 5.7 (as a single-thread flushing could no more follow), and implemented as dedicated parallel threads (cleaners) which are involved in background once per second to do LRU-driven flushing first (in case there is no more or too low amount of free pages) and then REDO-driven flushing (to flush …

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MySQL Performance : 8.0 GA on IO-bound TPCC

This post is mainly inspired by findings from the previous testing of MySQL 8.0 on TPCC workload(s) and observations from IO-bound Sysbench OLTP on Optane -vs- SSD. But also by several "urban myths" I'm often hearing when discussing with users about their IO-bound OLTP performance problems :
Myth #1 : "if I'll double the number of my storage drives -- I'll get x2 times better TPS !"

  • this was mostly true during "HDD era", and again..
  • (ex.: a single thread app doing single random IO reads from a single HDD will not go faster by doing the same from 2x HDD -- similar like single thread workload will not run faster on 8CPU cores -vs- 2CPU cores, etc.)
  • all depends …
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