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31
votes
7answers
59k views

Xen vs KVM in performance

What is faster on same hardware - Xen or KVM? I'm trying to pick-up a virtualization technology to work, which gives the best performance. There are some benchmarks here that I found on the subject: ...
25
votes
11answers
19k views

Is virtual machine slower than the underlying physical machine?

This question is quite general, but most specifically I'm interested in knowing if virtual machine running Ubuntu Enterprise Cloud will be any slower than the same physical machine without any ...
24
votes
6answers
13k views

filesystem for millions of small files

Which Linux filesystem would you choose for best speed in the following scenario: a hundred million files ~2k file size in average >95% read access pretty random access high concurrency (>100 ...
18
votes
1answer
3k views

Apache ab: please explain the output

I've looked around, and can't find any detailed explanation of the output at all. Most is indeed easy to understand, but there is one part that flummoxes me: Time per request: 109537.505 [ms] ...
13
votes
4answers
12k views

Anyone seen a meaningful SAS vs SATA comparison/benchmark?

I hear lots about SATA being slower than SAS but I've only found 1 decent benchmark. http://blog.whitesites.com/SAS-RAID-0-VS-SCSI-RAID-0-VS-SATA-Benchmarks__633689244191943184_blog.htm In this, SAS ...
9
votes
2answers
925 views

How much data does Linux read on average boot?

I wonder how much data in total does a freshly installed vanilla Linux system (like 32-bit CentOS 5.10) read in order to get to a virtual console shell prompt? You know, reading all the configuration ...
8
votes
3answers
5k views

Xen image file vs partition/LVM volume performance

I read quite a lot of advice to switch from file-image VM storage, to partition/LVM volume based. The claim is that partition/LVM are much faster then image files. The downside in my opinion, is ...
8
votes
3answers
212 views

Adding CPUs puts MySQL 5.5 (Debian) performance down

I am about to setup a database server (MySQL) in OpenVZ container and I've been wondering how many CPUs I should assign to it. I decided to benchmark it. I compared two OS/MySQL distributions and ...
7
votes
2answers
12k views

Understanding this error: apr_socket_recv: Connection reset by peer (104)

So, if I do some benchmarking with apache benchmark (ab), and I use large numbers of requests. Then sometimes in the middle of a test I get this error. I don't even know what it means. So how can I ...
6
votes
2answers
1k views

How can I benchmark my website with SPDY support?

I'm currently running a lot of configuration benchmarks on my server using siege, and I would like to try the SPDY protocol (with mod_spdy for Apache) - but siege use HTTP. Do you know any tool which ...
6
votes
2answers
5k views

Are there any benchmarks for virtual machines with and without VT-x?

Where can I find benchmarks of virtual machines running common OSes like Ubuntu or WinXP, with and without VT-x? I am using xVM (VirtualBox), but also have the option of VMWare or Xen hypervisors. ...
6
votes
6answers
10k views

Estimate FLOPS in Linux?

I am looking for a quick and easy program to estimate FLOPS on my Linux system. I found HPL, but getting it compiled is proving to be irritating. All I need is a ballpark estimate of the FLOPS, ...
5
votes
2answers
739 views

Is Amazon EC2 reliable for benchmarking?

I've been rethinking the compiler shootout and I began to wonder: is Amazon EC suitable for benchmarking? The environment is totally virtual, so are there any guarantees that benchmarking results will ...
4
votes
3answers
7k views

What are the best possible ways to benchmark RAM (no-ECC) under linux / arm?

I want to test integrity and global performances of no-ECC memory chips on a custom board Are there some tools that run under linux so I can monitor system and global temperature in the same time ? ...
4
votes
3answers
2k views

Tools to Benchmark VMware Datastore

Is there a tool that can be used to determine the maximum IOPS on my Datastores? Due to the way the SAN is configured (poorly by the installer) it's difficult to calculate this and we want to know ...
4
votes
2answers
1k views

Apache ab: choosing number of concurrent connections

I can't find anything that specifically elucidates the number of concurrent connections that are reasonable - nor can I find any treatises or research on this topic. The boss says "The server needs ...
4
votes
2answers
201 views

Does LXC container performance depends of host load?

I am wondering if LXC could offer a full isolated benchmarking environment. Let's say we have 2 identical machines, with the same fresh Linux and without network connection. First machine has a load ...
3
votes
7answers
920 views

How to benchmark hosting provider?

I'm about to choose some hosting provider for my project. Is there any way to get information about speed of their servers, network speed? I think it would be very interesting to see such (average) ...
3
votes
1answer
63 views

How can I measure complex I/O activity to develop realistic benchmarking? [closed]

I need to retrieve a few metric from my service server to benchmark another stroage solution. There are various options are provied by benchmark program(I choosed ...
3
votes
4answers
1k views

What does “random seek time” really means in HDD benchmarks?

I am currently benchmarking a hard drive. I am using HW32 for the measurement. The result has two parts: random seek time: 20 ms random read throughput: 30 Mbytes/s I am not sure the methods HW32 ...
3
votes
1answer
302 views

What are some current and relevant benchmark tools for Linux?

I'm specifically interested in benchmarks that approximate or target real in the wild usage scenarios. My main areas of focus are latency, network performance (incoming data over sockets). ...
3
votes
1answer
270 views

How to have proper expectations about AWS performance?

I'm in the process of moving a webapp from the local server that's been its development home to somewhere else for eventual deployment. I'm currently evaluating AWS and Rackspace, and am in the ...
3
votes
1answer
486 views

What does “receive” and “exceptions” mean in ab (Apache Benchmark) “failures”?

Getting this result from ab: Concurrency Level:      10000 Time taken for tests:   69.153 seconds Complete requests:      30000 Failed requests:        10379   (Connect: 0, ...
3
votes
2answers
476 views

Best Practices for Webserver Benchmarking

I have a webserver that I wish to benchmark before I make some optimizations to it to see if they have any effect. However, I want to know what are the best practices for benchmarking? For example, ...
3
votes
1answer
288 views

IO/s and MB throughput for Various RAID Arrays

Are there any resources that have typical throughput and IOp/s for various RAID arrays under sequential and random patterns? In my case I am more specifically interested in at the moment: 6 Disk ...
3
votes
1answer
62 views

benchmark my own servers

I have a pile of old and assorted servers. I want to benchmark, stress test and collect all hardware info from them before putting them into test lab environment. I would also like to be able to ...
3
votes
1answer
409 views

Apache Benchmark is slow from public network, magnitudes faster locally. What are some things I do to speed this up?

I am testing my Linode Ubuntu 14 64bit server out, it's the most basic server available from them. I am using Apache Benchmark to test the server, as well as a multithreaded script I wrote in Python, ...
3
votes
1answer
166 views

If external AB results are 200 rps and internal AB handles 3k rps, can I only handle 200 (limited by outbound speed) or 3k?

I've been trying to blitz.io my site, AB, etc., to try to get an understanding of how many concurrent users can use my site. Within my own box: Concurrency 500, 10000 hits 3k reqs per second. ...
3
votes
3answers
135 views

Would like to loadtest my website

I intend to host my site on a VPS and before I do, I wanted to test to see how much ram/cpu it will require for given number of concurrent users. What is the best way to set up a VPS on a home mahine ...
3
votes
5answers
830 views

tool for custom sql load testing

I would like to run some tests to compare our mysql application in several configurations. But I don't want to use something like sysbench or oltp tests, because we have some heavy stored-procedures ...
2
votes
2answers
159 views

Are most webserver benchmarks useless? [closed]

There's a plethora of benchmarks out there, comparing Apache, nginx, lighttpd, LiteSpeed/ OpenLiteSpeed, Cherokee etc. Unfortunately, it seems that most of the benchmarks are of the "small static ...
2
votes
3answers
1k views

Best way to benchmark linux virtualization solutions

I'd like to run some benchmarks on linux virtualization solutions (namely Xen, KVM and OpenVZ) and I'm currently thinking about how to set up the test environment. My current approach would be the ...
2
votes
1answer
377 views

CPU Throttling on Opteron 6272 in Windows

I'm in the process of attempting to benchmark a multithreaded application on my new HP Proliant Server which has an 2x Opteron 6272 and 64gb of ram. When I run the application on a desktop machine (a ...
2
votes
4answers
1k views

x86 Router Benchmarks?

I have grow to prefer x86 based router OS's like Vyatta and pfSense over their competitors Cisco and Juniper (I never really used Juniper, but still.). However, they feel "fake" to me, like ...
2
votes
4answers
647 views

Windows utilities for testing workstation disk performance?

I would like to test a few of my workstations hard drive performance and would like to know what are some good utilities for this task. They aren't database, nor file servers so I don't need anything ...
2
votes
2answers
159 views

Server Performance Comparison

We recently moved our users Home folders and shared drives onto a Novell OES server from a Novell Netware 6.5 server. All the folders are stored on a LeftHand SAN attached to the server through an ...
2
votes
2answers
96 views

Effective toy benchmark for a computer? [closed]

I wanted to do some (very rough) comparisons between different computers, seeing the relative compute performance of laptops and cloud machines (AWS EC2, rackspace, etc.). I wanted something ...
2
votes
1answer
1k views

Apache memory consumption

I am currently having very severe problems with my Linux CentOS dedicated server. For some peculiar reason, all of my memory is being consumed by apache and resultantly, my qmail process is crashing. ...
2
votes
1answer
2k views

Testing SSL performance on Nginx

I'm running nginx 1.0.0 on CentOS 6 x86_64 with stock OpenSSL. Below are results of openssl benchmarking. sh# openssl speed aes-256-cbc OpenSSL 1.0.0-fips 29 Mar 2010 built on: Sat Jun 25 04:58:15 ...
2
votes
1answer
369 views

Solaris 10: Drop disk cache? (to benchmark app)

Is there a command to drop the ZFS and UFS disk caches? (Preferably just one folder hierarchy.) I'm trying to tuning the performance settings of an application that read/writes data from a large ...
2
votes
2answers
171 views

Local vs cloud benchmark testing — which is better?

I have tried using Apache Benchmark (ab) to test my server. I ran the same test twice -- once locally on my local Mac desktop and once on a Media Temple server I rent. EDIT: To clarify, I am testing ...
2
votes
1answer
371 views

Do these results look right for 4xSATA in RAID 10? The writes are faster than the reads?

Do these results look right for a RAID-10 consisting of 4x1TB Samsung F3 SATA drives connected via a Dell Precision T3500's integrated RAID controller (which I believe is an Intel-based "FakeRAID")? ...
2
votes
3answers
628 views

What benchmark tool to use to benchmark hardware for VM server?

We are setting up a new piece of hardware to virtualize several of our servers on. Choices are RAID 5, RAID 6, and RAID 0+1. We are wanting to benchmark all three before we go live with the machine, ...
2
votes
2answers
516 views

Transfer between internal disks slows down for large files

I'm running a Ubuntu Server 11.04 (amd64) on a machine with 1.6Ghz dual-core CPU, 4GB RAM, and 2x250GB 7200 SATA drives (both 3.0Gb/s and newly formatted from a fresh install). When I transfer ...
2
votes
2answers
178 views

benchmark to run against normal server and vmware

we are switching over to vmware for our server. I want to make sure no performance is lost. What type of benchmark can I run on the old server and the new vmware server to determine performance?
2
votes
1answer
424 views

How to use the SPEC benchmark (for dummies)

I just had a quick look so far at the documentation of the SPEC2006 benchmark. However, until now I was not able to find some information how I can nicely present the performance measurements I got ...
2
votes
1answer
52 views

Benchmark individual drives in RAID5

I'm running a server with 3 RAID5 arrays through an ARECA 1880i coupled with a HP-SAS Expander. After experiencing a massive degradation in performance lately, I want to benchmark the drives ...
2
votes
0answers
623 views

ejabberd benchmarks and performance

I'm considering to use XMPP for messaging platform (not a chat, I'd rather use it as a transport protocol) for communicating one to one, one to many between custom clients and I think I will ...
2
votes
0answers
893 views

Performance comparison between LDAP servers

Has anyone ever compared different LDAP servers? I am currently planning to upgrade ADAM to another server, and I'd like to know how do they perform. Currently the options that I am researching are: ...
1
vote
6answers
2k views

How to prove that DNS traffic is being lost

In my office LAN, queries to the DNS servers outside our LAN really often fail (timeout). I suspect that it's some problem with our provider, but they have not responded to my complains. Is there a ...