Questions about server hardware and software performance, or network performance.

learn more… | top users | synonyms (2)

4
votes
2answers
218 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 ...
1
vote
2answers
135 views

How to improve a Java build server's performance?

We are setting up a new server for integration build. The original integration server can finish the "mvn install" in 3 minutes in a Linux box. Now by moving to a Windows 2012 server on VM, it's down ...
0
votes
0answers
171 views

Poor network performance when fileshare with CentOS on HyperV

I own Fujitsu Siemens server (TX100 I guess – I am not able to check this as I manage it remotely). I have got Windows 2008 Standard R2 sp1 installed. On this server I run Hyper-V and in it I have ...
1
vote
3answers
350 views

How many IOPS do I need? My workload bottleneck is storage

How can I know how many IOPS I need my storage to deliver for my overloaded Linux server? I have a server and I know it has storage as its bottleneck. I would like the bottleneck not to be storage, ...
1
vote
0answers
115 views

SSD+MDRAID+LVM+KVM results in lower performance than expected

We use kvm for virtualization, the disk images are stored as logical volumes. The logical volumes are stored on a bunch of software-RAID1 (mdadm) arrays composed of Intel DCS3500 SSDs (each array is a ...
1
vote
0answers
83 views

Postfix performance and how to increase my throughput?

What I've read so far: Postfix Tunning Postfix Bottle Neck Analisys The Book of Postfix (chapter 22) I have similar specs to this guy but I'm only able to send about ~1300 emails/hour What I've ...
1
vote
1answer
205 views

interpreting IOPS these Bonnie++ and iostat results

I am looking to interpret the IOPS from a few runs of bonnie++ using iostat simultaneously and using the benchmarking from this post: Can I determine IOPS on a disk array using bonnie++? bonnie++ ...
0
votes
1answer
907 views

How to troubleshoot slow performance on AWS EC2/RDS?

We recently moved our web servers from some 10 year old boxes to AWS EC2. Usage of the site is currently higher now (it's our busy season) and the site has become much slower, which is unexpected ...
1
vote
2answers
59 views

Splitting web project across multiple partitions on Linux (SSD, HDD and RAM Disk)

I've got a web project that pretty much consists of three parts: Code, Assets and Cache. I'm thinking of splitting it through multiple drives - Put my whole Code into SSD partition, Assets onto big ...
-5
votes
2answers
71 views

Hosting medium sized files - do I need a 1000mbps connection? [duplicate]

I am planning on setting up a free file hosting site where users can host files up to 1GB. I was looking at some dedicated server hosts and found one in the Netherlands that offers 50TB bandwidth per ...
0
votes
0answers
44 views

Trace Route, Slow Pings, timeouts on after server restore

I am getting bad ping times on my server, especially for large data requests. The stored procedure on the server runs at 1 second, while calling it through my web applicaiton takes 23+ seconds. This ...
-1
votes
2answers
750 views

Bad disk performance on m3.medium (SSD) EC2 instance [closed]

May be I'm missing something but at a glance new SSD-based m3.medium EC2 instance doesn't provide any disk performance advantage. I didn't run benchmark tools yet, but directory copying, directory ...
-2
votes
4answers
167 views

Too many httpd processes on my Cpanel VPS [closed]

For months my VPS has been doing fine. But since last week I saw Mysql server stopped two times and I was told that it was some load issue. I don't want to upgrade due to budget issue. Yesterday when ...
0
votes
0answers
20 views

Typical web browsing profile

I am looking for a typical profile of a one day browsing session. The end goal is to realistically simulate a web proxy traffic in a mobile network. Of course the best would be to find some kind of ...
2
votes
1answer
50 views

Server load avg. hitting 16-20, but all resources under 90% usage?

As you can see in the image shared below, the server load peaked to almost 20 but the CPU, RAM, DISK IO and Network I/O remained well under their full capacity. My question is: 1). What caused the ...
1
vote
1answer
71 views

Intermittent performance issues on Azure Web Application with ASYNC_NETWORK_IO errors

Our web application is suddenly experiencing intermittently slow performance (slow page loads, slow ajax calls going from <1 sec to over 20 secs). The only clue is when the application slows, we ...
0
votes
0answers
8 views

Boost up performance of Rails application on Ubuntu [duplicate]

I'm trying to configure my ubuntu server to serve as many as possible concurrent connection. My application is built on RoR and it takes about 30ms to serve a request in average. I also use fushion ...
0
votes
0answers
28 views

Dual Drive Failure and server restore slowness on Windows Server R2

I recently had a hosting company that had a dual drive failure within 6 minutes of each other, not sure how that could even happen. However they had to restore a backup of the server last night. ...
0
votes
1answer
86 views

Linux unfriendly IIS/ASP.NET :-) : Quick download on windows but slow on linux [closed]

This particular web site (gops.tay.be) serves objects quick if I try to request the page using windows, but I get them very slow if trying using linux. There is no difference if I use browser or curl: ...
-1
votes
1answer
49 views

Does not measuring performance improve performance?

Running the Task Manager or Resource Monitor or even simply viewing the status of a network connection indicates the system is constantly tabulating a large number of performance metrics. It must ...
0
votes
2answers
33 views

Distribute all services between 3 VPS [closed]

i just rent 3 vps servers with this: 4GB RAM 150GB hard disk 2 CPU 6 ip address so we have vps1, vps2 and vps3 and i'm thinking distribute the services like this: VPS1 - frontend + DNS Server + ...
1
vote
4answers
240 views

Heavy production MySQL/Percona Database in openvz container

So I'm currently running a MySQL 5.1 database, with the following specs: Proc: Intel(R) Xeon(R) CPU E5-1620 0 @ 3.60GHz RAM: 64 Go disks: 2x 100 Go SSD (RaidSoft) I'm planning to migrate my ...
-1
votes
3answers
262 views

How can be ping used to measure a server speed? [closed]

When I ping myserver.com, I get this responses: 64 bytes from XXX.XXX.XXX.XXX: icmp_seq=1 ttl=242 time=52.6 ms 64 bytes from XXX.XXX.XXX.XXX: icmp_seq=2 ttl=242 time=55.9 ms 64 bytes from ...
0
votes
1answer
123 views

Randomly slow MySQL queries

I know this type of question come often. But I have done a lot of research, tried a lot of different settings, but still have the same issue: queries that usually are very fast can take 3s to 5s ...
2
votes
0answers
451 views

Very poor disk performance on KVM node - mdadm raid10

For a long period of time, i'm experiencing performance issues on CentOS servers that are used for KVM virtualization. I'm running software RAID-10 with 4 disks (Seagate ST2000DM001, 2TB, 7200rpm ...
0
votes
2answers
105 views

Graceful way to rsync millions of files between two local folders

I want to rsync a folder with millions of files from a local directory to another, on a daily basis. The files themselves change very rarely. I want to reduce the impact on the running server, e.g. ...
0
votes
2answers
34 views

Apache Configuration not use server capabilities

I have a web server with 16 GB of RAM. The server has a good traffic and have pics of 300 simultaneous requests. Unfortunately when these peaks arrive queries fall into error or are very very slow. ...
2
votes
0answers
69 views

How to debug sluggish process performance

I have a test application which writes a string to a file 10000 times. I run this on two servers and I get totally different results. [SYSTEM 1] $ time ./test_depth real 0m0.152s user ...
0
votes
0answers
69 views

Are there any performance benefits when using Redis caching combined with Nginx caching?

I came across these posts about putting Redis in front of Nginx. I also noticed the Nginx HTTPRedis module. Which seem interesting from a performance standpoint, but I don't have much experience in ...
0
votes
1answer
855 views

Is it possible to use SSD for storage on Windows Azure?

There is some marketing-speak suggesting that it may be possible ..: http://gigaom.com/2012/06/05/new-windows-azure-goes-all-ssd-to-one-up-amazon-in-the-cloud/ .. but I couldn't find any way to ...
1
vote
1answer
165 views

Why WHM, New Relic and SSH memory usage statistics different?

I have a Cent OS 6.4 Apache Nginx VPS. I have WHM cpanel. How do I check past 24 hours or 48 hours this server RAM usage? I use new relic server monitor web application. It reported that, this VPS ...
0
votes
0answers
41 views

What is a good set of performance counters to measure scalability bottlenecks

We're moving our enterprise product to the cloud (IAAS) and are determining how many users we can support on a single VM. Our product uses SQL Server, SharePoint and a bunch of WCF services. What ...
1
vote
0answers
32 views

How do I reduce server load for a dormant WordPress site using W3 Total Cache?

My current host who did all performance optimization for me has jacked up their price to $1,000/month, so I was forced to move to a new host. The new host charges only $150/month. They give you W3 ...
0
votes
0answers
30 views

How to benchmark a whole storage infrastructure

I'm a 100% sure that I'm not the first one to consider benchmarking a whole infrastructure, but yet I haven't found any relevant information on how to face this challenge. As I guess we all know what ...
0
votes
1answer
278 views

HTTPS overhead compared to HTTP

HTTPS is the encrypted version of HTTP, and nowadays it is becoming a common practice to encrypt all the web traffic, not only sensitive one. The drawback of HTTPS, apart from the need to buy ...
0
votes
1answer
38 views

Wireless performance, normal results

Here is the setup: An IBM server machine connected to a TP-Link TL-WR1043ND (latest firmware). It is connected with a wired gigabit connection. An lenovo laptop with a centrino wireless-n 2230 and a ...
-1
votes
2answers
39 views

What exactly is controlling single HTTP requests speed? [closed]

As you may know using multiple HTTP threads when downloading a file from a server can significantly increase your download speeds if not max it out. What is control of determine the throughput of ...
2
votes
1answer
124 views

My Ubuntu VPS is not using available swap, even if OOM. What to do?

I recently added 1 GB of swap to my Ubuntu virtual private server to prevent MySQL crashes on RAM overloading. I followed this tutorial. I use htop to monitor resources. When I use loadimpact to test ...
2
votes
4answers
667 views

LSI RAID: Write cache policy affects read performance?

I have a server with a LSI MegaRAID SAS 9260-4i controller, RAID-5 with 3 x 2 TB disks. I did some performance testing (with iozone3) and the numbers show clearly that the write cache policy affects ...
1
vote
1answer
48 views

Advice on web server performance troubleshooting is needed

I'm renting a virtual CentOS based server where I have about 5 active sites running. Several months ago I noticed a significant performance degradation in how my sites are running. First symptom was ...
0
votes
2answers
86 views

How to tell which script is slowing down the server the most?

As it happens often to coders, I had to take over someone else's code for this company, the server runs on Amazon Cloud (i2.xlarge) running ubuntu-saucy-13.10-amd64-server. (the guy left) The ...
1
vote
2answers
185 views

Why does dd show slow disk speed first time?

I'm checking the disk speed of a hdd on CentOS 6 using dd command. The setup is a DRBD setup - with this server being primary. To ensure that I get correct values, I execute the dd command 3 times ...
-1
votes
2answers
701 views

Poor SQL performance on HP ProLiant ML310e Gen8 v2 with raid10

I recently bought HP ProLiant ML310e Gen8 v2 server with 8G's RAM and 4 HP 1TB 6G 7.2k rpm SATA (3.5in) Non-Hot Plug MDL HDD disks. It was surprise to me that HP didn't provide debian drivers for ...
4
votes
2answers
319 views

Importance of disk alignment for Windows Server 2012

I saw article about Disk alignment here and also here.Also there where some references that windows server 2003 has some problem with disk alignment. After reading article I am confused whether we ...
1
vote
0answers
114 views

Why are pgpgin/s and majflt/s inconsistent in sar -B?

In sar -B ouptut, I would naively expect pgpgin/s to equal majflt/s multiplied by the system page size. From man sar: pgpgin/s Total number of kilobytes the system paged in ...
-1
votes
1answer
39 views

Firewall Connections fail to open under load

Problem : During High load , our applications are encountering errors : java.net.connection Time out. After some investigation , we found out that it was Firewall the root cause, but still don't know ...
0
votes
1answer
27 views

Slow application performance in one location

We have a problem that perplexing both of us in our department. We have a video viewing application that we need to have loaded on a workstation to be used in a particular location. When we load a ...
0
votes
1answer
97 views

Using all host resources for a single Windows VM (KVM) - how to improve performance

We're using KVM/qemu on Ubuntu 12.04 to spawn a Windows 2008 R2 VM that uses a lot of host resources (all CPU cores, 4GB RAM). It seems that during a Windows boot that Windows allocates all its ...
2
votes
1answer
76 views

How Long Should Data Collection Sets run in Windows Server Performance Montioring

I currently have an application server and a database server both running on Windows Server 2008 R2. I have been tasked with generating a weekly report on the utilization of CPU, Memory and Disk. I am ...
0
votes
1answer
44 views

uk vps server route to thailand? [closed]

I'm just a Javascript developer using node.js... My host has got me a vps sever in england. I have had someone test my site loading in england and it is lightning fast. I've also had someone test in ...