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Displaying posts with tag: Tools/ IObench (reset)

MySQL Performance: Linux I/O and Fusion-IO, Part #2
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This post is the following part #2 of the previous one - in fact Vadim's comments bring me in some doubts about the possible radical difference in implementation of AIO vs normal I/O in Linux and filesystems. As well I've never used Sysbench for I/O testing until now, and was curious to see it in action. From the previous tests the main suspect point was about random writes (Wrnd) performance on a single data file, so I'm focusing only on this case within the following tests. On XFS performance issues started since 16 concurrent IO write …

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MySQL Performance: Linux I/O and Fusion-io
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This article is following the previously published investigation about I/O limitations on Linux and also sharing my data from the steps in investigation of MySQL/InnoDB I/O limitations within RW workloads..

So far, I've got in my hands a server with a Fusion-io card and I'm expecting now to analyze more in details the limits we're hitting within MySQL and InnoDB on heavy Read+Write workloads. As the I/O limit from the HW level should be way far due outstanding Fusion-io card performance, contentions within MySQL/InnoDB code should be much …

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MySQL Performance: Linux I/O
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It was a long time now that I wanted to run some benchmark tests to understand better the surprises I've met in the past with Linux I/O performance during MySQL benchmarks, and finally it happened last year, but I was able to organize and present my results only now..

My main questions were:

  • what is so different with various I/O schedulers in Linux (cfq, noop, deadline) ?..
  • what is wrong or right with O_DIRECT on Linux ?..
  • what is making XFS more attractive comparing to EXT3/EXT4 ?..

There were already several posts in the past about impact on MySQL performance when one or another …

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MySQL Performance: 5.4 outperforms PostgreSQL 8.3.7 @dbSTRESS !
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Forget to say, I've also tested PostgreSQL 8.3.7 during the last benchmark serie with dbSTRESS!

A big surprise - if two years ago on the same workload PostgreSQL was two times faster (see: ), now it's MySQL 5.4 outperforming PostgreSQL!

  • Read-Only workload: MySQL is near two times faster now! (13.500 TPS vs ~7.000 TPS for PostgreSQL)

  • Read+Write workload: MySQL performs as well or better (7.000-8.000 TPS vs 6.000-7.000 TPS for PostgreSQL) …

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Showing entries 1 to 4

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