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Displaying posts with tag: Benchmarks (reset)
Benchmarking single-row insert performance on Amazon EC2

I have been working for a customer benchmarking insert performance on Amazon EC2, and I have some interesting results that I wanted to share. I used a nice and effective tool iiBench which has been developed by Tokutek. Though the “1 billion row insert challenge” for which this tool was originally built is long over, but still the tool serves well for benchmark purposes.

OK, let’s start off with the configuration details.

Configuration

First of all let me describe the EC2 instance type that I used.

EC2 Configuration

I chose m2.4xlarge instance as that’s the instance type with highest memory available, and memory is what really really matters.

High-Memory Quadruple Extra Large Instance
68.4 GB of memory
26 EC2 Compute Units (8 virtual cores with 3.25 EC2 Compute …
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Testing Fusion-io ioDrive2 Duo

I was lucky enough to get my hands on new Fusion-io ioDrive2 Duo card. So I decided to run the same series of tests I did for other Flash devices. This is ioDrive2 Duo 2.4TB card and it is visible to OS as two devices (1.2TB each), which can be connected together via software RAID. So I tested in two modes: single drive, and software RAID-0 over two drives.

I should note that to run this card you need to have an external power, by the same reason I mentioned in the previous post: PCIe slot can provide only 25W power, which is not enough for ioDrive2 Duo to provide full performance. I mention this, as it may be challenge for some servers: some models may not have connector for external power, and for some …

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New distribution of random generator for sysbench – Zipf

Sysbench has three distribution for random numbers: uniform, special and gaussian. I mostly use uniform and special, and I feel that both do not fully reflect my needs when I run benchmarks. Uniform is stupidly simple: for a table with 1 mln rows, each row gets equal amount of hits. This barely reflects real system, it also does not allow effectively test caching solution, each row can be equally put into cache or removed. That’s why there is special distribution, which is better, but to other extreme – it is skewed to very small percentage of rows, which makes this distribution good to test cache, but it is hard to emulate high IO load.

That’s why I was looking for alternatives, and Zipfian distribution seems decent one. This distribution has a parameter θ (theta), which defines how skewed the distribution is. A physical sense of this parameter, if to apply …

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Testing Fusion-io ioDrive – now with driver 3.1

In my previous post with results for Fusion-io ioDrive we saw some instability in results, I was pointed that it may be fixed in new drivers VSL 3.1.1. I am not sure if this driver is available for everyone – if you are interested, please contact your Fusion-io support representative. I installed new drivers and firmware, and in fact, the result improved.

Information about driver and firmware: Firmware v6.0.0, rev 107006. Fusion-io driver version: 3.1.1 build 172.

Actually an upgrade was not flawless, after a firmware upgrade I had to perform low-level formatting, which erase all data. So if you want to do the same – make sure you copy your data.

So there are results for driver 3.1 (with comparison to previous driver 2.3)

Random writes:

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Testing Virident FlashMAX 1400

I still continue to run benchmarks of different SSD cards. This time I show numbers for Virident FlashMAX 1400. This is a MLC PCIe SSD device. There are couple notes on these results.
First, this time I use a different server. For this benchmark it is Cisco UCS C250, while for previous results I used HP ProLiant DL380 G6.

Second note is, that I use a mode “turbo=1″ for Virident card. What does that mean? Apparently PCIe specification has a limitation on available power. If I am not mistaken it is 25W, however Virident to provide full write performance requires 28W. And while many servers can handle 28W on PCIe, this is a non-standard mode, and Virident by default uses 25W (turbo=0). To force full power, I load a driver with turbo=1. I also use “maxperformance” formatting for Virident, …

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Testing Fusion-io ioDrive

Following my series of posts on testing different SSD, in my last post I mentioned that SATA SSD performance is getting closer to PCIe cards. It really makes sense to test it under MySQL workload, but before getting to that, let me review the same workload on Fusion-io ioDrive PCIe card. This is yet previous generation of Fusion-io cards, but this is the one that has biggest installation base.

Driver information: Fusion-io driver version: 2.3.10 build 110; Firmware v5.0.7, rev 107053

Following the format of previous benchmarks, first is random write async 16KB case.

We can see some wave-like pattern with throughput 350-400 MiB/sec.

Random reads, async:

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Testing Intel SSD 520

Following my previous benchmarks of SATA SSD cards I got Intel SSD 520 240GB into my hands. In this post I show the results of raw IO performance of this card.

The benchmark methodology I described in previous posts, so let me jump directly to results.

First case is random write asynchronous 8 threads IO, the test is done just after a secure erase operation on the card.

The card is doing stable 380 …

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Testing STEC SSD MACH16 200GB SLC

Following my previous benchmark of Samsung 830, today I want to show results for STEC MACH16 SATA card, 200GB size, this card is based on SLC, and regarding STEC website, it is an enterprise grade storage.

For tests I use sysbench fileio, 16KiB block size (to match workload from InnoDB, as this is primary usage for me), and recently I switched to use async IO mode. There are two reasons for that. First, MySQL/InnoDB uses async writes, so this will emulate database load, and second, async mode allows to see maximal possible throughput, it does not show reliable latency though, as it appears there is no a reliable way in the Linux asynchronous IO library to get time metrics for particular IO …

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Testing Samsung SSD SATA 256GB 830 – not all SSD created equal

I personally like PCIe based Flash, but from a pricing point our customers are looking for cheaper alternatives. SATA SSD is an options. There is many products based on MLC technology, and Intel 320 I would say is the most popular. I do not particularly like its write performance – I wrote about it before, that’s why I am looking for comparable alternatives. Samsung 830 256GB looked like a good product, that’s why I decided to test it.

For tests I use sysbench fileio, 16KiB block size (to match workload from InnoDB, as this is primary usage for me), and recently I switched to use async IO mode. There are two reasons for that. First, MySQL/InnoDB uses async writes, so this will emulate database load, and second, async mode allows to see maximal possible throughput, it does not show …

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Benchmarks challenges of XtraDB Cluster

We are running internally a lot of benchmarks on our recently announced Percona XtraDB Cluster, and I am going to publish these results soon.
But before that I wanted to mention that proper benchmark of distributed system comes with a lot of challenges.
I am saying that not to complain, but to make sure, if you are going to benchmark XtraDB Cluster yourself, there is a lot of things to take into account.

And it seems that one component, which was not much important before, now appears as critical peace, which easily can became bottleneck in the benchmarks – this is network.

In case of simple client-server setup, the network is not fully utilized.

But as …

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