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Displaying posts with tag: NUMA (reset)

MySQL on NUMA machines just got better!
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A followup to my previous entry , my patch that was part of Bug #72811 Set NUMA mempolicy for optimum mysqld performance has been merged!

I hope it’s enabled by default so that everything “just works”.

I also hope it filters down through MariaDB and Percona Server fairly quickly.

Also, from the release notes on that bug, I think we can expect 5.7.8 any day now.

The sad state of MySQL and NUMA
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Way back in 2010, MySQL Bug 57241 was filed, pointing out that the “swap insanity” problem was getting serious on x86 systems – with NUMA being more and more common back then.

The swapping problem is due to running out of memory on a NUMA node and having to swap things to other nodes (see Jeremy Cole‘s blog entry also from 2010 on the topic of swap insanity). This was back when 64GB and dual quad core CPUs …

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Preliminary MySQL Cluster benchmark results on POWER8
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Yesterday, I got the basics going for MySQL Cluster on POWER. Today, I finished up a couple more patches to improve performance and ran some benchmarks.

This is on a 3.7Ghz POWER8 machine with non-balanced memory (only 2 of the 4 NUMA nodes have memory, so we have less total memory bandwidth than we could have, plus I’m going to bind ndbmtd to the CPUs in these NUMA nodes)

With a setup of a single replica and two data nodes on the one machine (each bound to a specific NUMA node), running the flexAsync benchmark …

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On MySQL Memory Usage and Configuration
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I saw a post on profiling memory usage today and this reminds me of several discussions I have had with different people.

Why would you want to profile the memory usage? Usually to see where memory is allocated and for what purposes, and usually you only care when memory usage is higher than expected. That is a DBA normally wants to use all available memory on a server for mysqld, whatever that size may be.

Configuration parameters may be inappropriate and need adjusting, so having a way to …

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Showing entries 1 to 4

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