In the previous blog, we saw that users don’t lose anything by moving to MySQL on ARM. Infact, users are set to gain performance and save cost. In this blog post we will see performance numbers and analyze them to understand points where ARM scores.
MySQL on ARM is gaining consistent momentum and community is excited about it. Beyond performance, users also tend to explore other aspects like feature-set, ecosystem, support, etc… Let’s explore what users would gain/lose by moving to mysql on arm.
One of the key activities that a DBA does regularly is creating backup of an active database instance. So having a working backup tool in place especially for hot-backup is important when a user think of running DB-on-ARM. Even though Percona Xtrabackup (PXB) is not yet officially offered on ARM one can compile and successfully run it on ARM. This article will help explore the same.
Percona Monitoring and Management (PMM) is an effective tool in tracking stats of the running MySQL servers. Especially, the timelines capability helps users to get the picture of how the given stats changes over tenure of the workload. PMM official packages are not yet available on ARM but part of the PMM (importantly the stats collector aka exporter) could be compiled on ARM that would facilitate reporting stats of the MySQL instance running on ARM to PMM-Server there-by allowing it to track MySQL on ARM.
ARM processors are fast gaining popularity in the High Performance Computing (HPC) space with multiple cloud providers providing powerful and flexible variants of ARM instances to boot. Users are still in a dilemma about whether running MySQL on ARM is really effective? To help ease this out we introduce a Cost-Performance-Model (#cpm). Model is generic in nature to help normalize computing configuration based on cost and could be used for other HPC kinds of software too.
ARM introduced LSE (Large System Extensions) as part of its ARMv8.1 specs. This means if your processor is ARMv8.1 compatible it would support LSE. LSE are meant to optimize atomic instructions by replacing the old styled exclusive load-store using a single CAS (compare-and-swap) or SWP (for exchange), etc…. Said extensions are known to inherently increase performance of applications using atomics.
MySQL has multiple mutex implementations viz. wrapper over pthread, futex based, Spin-Lock based (EventMutex). All of them have their own pros and cons but since long MySQL defaulted to EventMutex as it has been found to be optimal for MySQL use-cases.
“Running MySQL on selected NUMA node(s)” looks pretty straightforward but unfortunately it isn’t. Recently, I was faced with a situation that demanded running MySQL on 2 (out of 4) NUMA nodes.
Managing global counters in a multi-threaded system has always been challenging. They pose serious scalability challenges. Introduction of NUMA just increased the complexity. Fortunately multiple options have been discovered with hardware lending support to help solve/ease some of these issues. In this blog we will go over how we can make Global Counter NUMA SMART and also see what performance impact each of this approach has.
ARM community that has developers from varied organizations has contributed some really good patches to MySQL. Most of them are awaiting acceptance. Blog is meant to analyze these patches along with their pros and cons. Hopefully this would help ease MySQL/Oracle to accept these long-awaited patches.
Often we observe jitter in MySQL throughput while running benchmark. Same could be true even for users but there are so many other things to look for (especially IO bottleneck) that the aspect we plan to discuss today may get overlooked. In this article we will discuss one such reason that could affect the MySQL performance.
InnoDB uses mutexes for exclusive access and rw-locks for the shared access of the resources. rw-locks are used to control access to the common shared resources like buffer pool pages, tablespaces, adaptive search systems, data-dictionary, informaton_schema, etc… In short, rw-locks play a very important role in the InnoDB system and so tracking and monitoring them is important too.
By and large this would be a topic of interest for most of us including me when I started to explore this space. Before we dwell into the numbers let’s first understand some basic differences between 2 architectures. Beyond being CISC and RISC let’s look at the important differences from MySQL perspective.
I am sure most of you may have this question. In fact, I too had it before I started working on #mysqlonarm initiative. What does it take to run MySQL on ARM? Does it really work? What about dependencies? What kind of performance does it have? What about support? Is there enough community support? This could go on…..
ARM processors are everywhere. It is quite likely some of you may be reading this blog from an ARM powered device. Phone, IoT devices, consumer and home appliances, health-care devices, all are powered by ARM processors. ARM processors are known to be power efficient and so most of these devices that demands a long recharge cycle but less processing power started using them.