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

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2
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5answers
237 views

Thousands of files to backup…overhead killing us

We have a system that generates literally 5k - 10k XML files each day. It's a long story but that system will not change for a while. Anyway, the system dumps these XML files (3k-20k each) into ONE ...
0
votes
2answers
166 views

Performance issue with Drupal and Mediawiki, I don't know where to look?

I have a webserver running CentOS 5, with Apache 2 and PHP 5.3. At the moment the server is mainly used for development, so there's really no traffic to talk about. The server houses a couple of ...
2
votes
2answers
241 views

Route over the public interface or the VPN?

I have a site-to-site VPN between two offices. Office A hosts a web service that Office B wants to access. The web service is accesible from the public internet (http://www.example.com) and on the ...
2
votes
2answers
575 views

The CPU idle is set to 99 while using vmstat, what does this mean?

I am confused with the CPU idle time is set to 99. Does this mean the CPU is idle not doing anything for 99% of the time? #vmstate procs -----------memory---------- ---swap-- -----io---- --system-- ...
0
votes
1answer
141 views

PHP MySQL & Performance

i am setting up PHP & MySQL on my local development machine. i want to find out about things to consider for performance. some considerations i have below. i will like to hear more about ...
0
votes
2answers
131 views

Hosting for the Fastest Download Speeds

Hello I'm developing an iPhone app that downloads some reasonably chunky database files (10M-50M) my current server is hosted in the US, I am based in the UK, my download speeds aren't great, ...
2
votes
1answer
705 views

Pros and Cons of Keep-Alive from Web Server Side

Keep-Alive connection feature in HTTP protocol is meant to reduce TCP connection hits to web server. It should be able to improve web server performance. However, I found that some web servers ...
3
votes
2answers
445 views

Another benefit of Lighttpd in front of Apache

I have read in a site that another benefit of having Lighttpd in front of Apache is lower number of child processes. Lighttpd will handle keep-alive and client requests while child processes of Apache ...
5
votes
4answers
10k views

Howto check disk I/O utilisation per process

Im having a problem with a stalling Linux system and I have found sysstat/sar to report huge peaks in disk I/O utilization, average service time as well as average wait time at the time of the system ...
0
votes
1answer
545 views

Optimize windows 2008 performance

I have windows server 2008 sp2 installed as virtual machine on my personal laptop. I use it only for source control (visual svn) and continuous integration (teamcity). As the virtual machine resources ...
0
votes
3answers
8k views

How long does it take to rebuild a drive in a RAID 6?

I'm building a 7-disk RAID 6 array on a DELL MD3000 DAS box. My top priority is storage space, so I'd like to use 2TB drives -- but I'm worried about how long it will take to rebuild a failed disk. ...
2
votes
2answers
907 views

Sudden peaks in load and disk block wait

Hello superior server gurus! I'm running a Ubuntu server that hosts an apache tomcat service along with an MySQL database. The server load is always close to zero, even during the busiest hours of ...
0
votes
4answers
86 views

What's the best way to debug and enhance the speed of your server?

My server has been running slightly slower than normal. I was wondering what strategies I could do to evaluate the speed of my server, and enhance it This question covers database interaction, I/O, ...
13
votes
5answers
1k views

Which bots and spiders should I block in robots.txt?

In order to: Increase security of my website Reduce bandwidth requirements Prevent email address harvesting
1
vote
2answers
984 views

Horrible PHP/MySQL Query Performance On Ubuntu Server 10.04

I just did a clear install of Ubuntu Server 10.04 with the standard LAMP config.. Then I made a small script to test insert speeds into a table with 3 columns. When I run the script on any of my ...
0
votes
1answer
117 views

Application pool memory gets out of control after updating dlls

We are experiencing Memory issues every time we update the dll's using SVN. The IIS process(w3wp.exe) takes up more than 1GB of memory which is usually 300 - 400 Mb under normal conditions. So every ...
0
votes
4answers
263 views

RAID vs Separate HDD's

What would be more efficient? Let say we have 2 hdd's. Consider this scenario: There are 2 simulations requests. In the RAID-0 setup the speed of the response will be boosted by the array. In ...
4
votes
2answers
2k views

ZFS with L2ARC (SSD) slower for random seeks than without L2ARC

I am currently testing ZFS (Opensolaris 2009.06) in an older fileserver to evaluate its use for our needs. Our current setup is as follows: Dual core (2,4 GHz) with 4 GB RAM 3x SATA controller with ...
0
votes
3answers
208 views

64bit VM guest on Server 2 performance horrible if >2GB RAM

We're a software development shop, and we're experimenting with VMWare Server 2 on Windows XP Professional/32 (corporate standard, can't get away from it) with Windows 2008 x64 as guest for 64-bit ...
1
vote
3answers
1k views

Poor IO performance on SQL Servers in VMs

I have a small VM ESX 3.0 implementation - mostly test web servers, however there is 1 db server that gets terrible io performance. Will adding additional virtualized disks in a RAID help ...
0
votes
4answers
733 views

need high performance, distributed storage of audit logs from multiple servers

I have a load balanced farm of servers that need to log various messages to an audit log, which will be processed off line at a later stage (This is a medical app, so all access to patient records ...
1
vote
1answer
2k views

How do I view frequency of disk I/O wait states in Windows 7?

I can see most everything except this statistic between the Task Manager, Performance Monitor, and Resource Monitor. On linux, this is fairly easy to get at via the iostat command.
1
vote
1answer
2k views

Writing on an external USB hard disk is very slow on my local Linux CentOS server

I have this external harddrive: _ Buffalo Ministation TurboUSB HD-PS250U2 250 GB _ just formatted using ext3 _ 250 GB _ interface USB2 _ SATA 150 internal interface _ no hardware encryption _ full ...
0
votes
1answer
411 views

Sybase 15.0 : Improving simple insert/select speed

What are the ways to improve performance of the following procedure: Every day I take a datafile, bcp it into an intermediate table without indexes (so that data import is as fast as possible), and ...
0
votes
1answer
111 views

Should I use SSD for a big multi user Access

Hello to everybody I would really like ur opinion on this subject. I have this case. About 10 mde (Access Programs) with around 2GB of Access Databases A lot of Code and a lot of data...i have tables ...
1
vote
3answers
174 views

What kind of server is used by sites like Pandora or Last.fm to serve media files?

What kind of server is used by sites like Pandora or Last.fm to serve media files? I am assuming they would have something other than webserver for storing and serving media files... what are some of ...
0
votes
2answers
239 views

Server OS usage index

Is there any server OS usage index (like tiobe index for programming languages)? I haven't found anything better than google trends
3
votes
2answers
4k views

IIS7 Slow for some users when using Windows Authentication

We have an internet site containing a "hello world" .html file on IIS7 with Windows authentication turned on. The users are local machine Windows users on the web-server. For some users the site is ...
21
votes
5answers
22k views

Can a pool of memcache daemons be used to share sessions more efficiently?

We are moving from a 1 webserver setup to a two webserver setup and I need to start sharing PHP sessions between the two load balanced machines. We already have memcached installed (and started) and ...
0
votes
0answers
605 views

Slow Sharepoint Server 2010

I have a sharepoint 2010 installation that is running really slowly. The installation is set up as follows, I have a domain controller (Server 2008 64 bit) with active directory and DNS set up I ...
0
votes
2answers
456 views

SQLIO vs. PerfCounter - Which one to trust?

I did a quick SAN Performance test over the weekend with SQLIO (not SQLIOSim). The first two tests involved writing random 64k blocks to 1 GB files on H:\ and K:\ Here are the results from SQLIO: ...
12
votes
11answers
13k views

A monitoring tool that captures processes' memory usage/cpu usage, etc over time

I am looking for a way to diagnose issues, such as swap death, where a balooning memory process fills up swap and kills the whole machine (such as apache). I'm already using cacti and I can set up ...
6
votes
3answers
622 views

Why is there less latency on loopback than on a carp interface?

Stack Overflow Careers is served up something like so: user -> internet -> our fw -> nginx -> haproxy -> web farm FreeBSD is the operating system in use no firewalling or QoS is in ...
1
vote
3answers
5k views

How do I identify slow queries in sql server?

I've found long, complicated instructions like this when googling for the answer to this question, an brief reference links such as in this post. I'm looking for a succinct a procedure as possible to ...
2
votes
2answers
1k views

MySQL binlog analyzing and reporting tool

One of the databases I maintain has recently increased its write load by 2x. In order to find out what insert/update statements are causing that load increase, I'm looking for a tool to report and ...
2
votes
2answers
1k views

Does a read on a NFS file system slow performance?

If a NFS client reads a file, does any network traffic happen? or is it just writes (by any node) that result in network traffic? In particular, I'm interested in whether doing a file_exists() call ...
2
votes
3answers
1k views

Can tail slow down log writing speed on Linux (ext3)?

I'm wondering if tailf can generate blocking I/O which will slow down server responsiveness due to logging. For ex. assuming the following setup: Debian 5.1 linux server (foo) which is managed via ...
1
vote
3answers
4k views

UTP cable maximum length

When I connect ten computers over a 100 meters (328ft) UTP Cat5, is the signal loss so large that it will affect my network performance? These computers perform simple office tasks, and the 100m utp ...
1
vote
1answer
276 views

CPU Performance on Virtualised Windows 2000 for Oracle 8.0.5

Can somebody suggest any steps I can take to improve the CPU performance of an Oracle 8.0.5 database on a Virtualised Windows 2000? Update New installed OS, Windows 2000 Server Advanced SP4 Oracle ...
0
votes
2answers
4k views

What tools can I use to test the real read speed of a RAID1?

Some RAID controllers speed-up read access when using RAID1. Other controllers can't do that. Trying some RAID1 configurations, I want to know if the read speed is faster both on a single file and on ...
2
votes
1answer
90 views

Profiling windows performance

I am used to using profilers for software development. I have had multiple windows pcs which all have slowed down over time, as well as had work PCs become slower. I understand this is probably the ...
0
votes
4answers
787 views

Do i need to allocate more resources to mysql server?

I have feeling that mine mysql server is slower than normal while processing queries from the PHP website. Is there anything like i can allocate more resources to Mysql server to make it speedy? I ...
2
votes
2answers
1k views

Faster zlib alternatives

I wonder, if there are any faster builds of zlib around with more advanced optimizations? If it's possible to optimize it using SSE instructions or Intel C++ compiller, or some trick which were ...
3
votes
2answers
390 views

MediaWiki is getting slower gradually

I set up my MediaWiki on a CentOS. In the first few months, it works fine and fast. But it seems gradually getting slower. My wiki site has less than 50 pages, so it's a very small scale site. But it ...
0
votes
2answers
412 views

Benefits of virtualizing an application server onto Xenapp

Apart from easier deployment and administration, are there any performance benefits in virtualizing an application server? For example, could I fit more operational users on 4 app server VMs on a ...
6
votes
3answers
2k views

Monitor system CPU / system calls in Linux

I have a couple processes that are eating up a lot of system CPU time (as determined by looking at vmstat). Is there an easy way to find out what kind of system calls are being made? I know there ...
2
votes
2answers
2k views

Is it possible to configure the initial window size for tcp slow start on Windows?

I need to minimize latency for sending moderate-sized messages (~100kb) from a Windows Server 2008 R2 to another machine with the same OS. Studying wireshark logs and looking at tcp graphs shows that ...
2
votes
4answers
418 views

What country should I buy a VPS in that will give the best bandwidth? [closed]

I live in Australia and was wondering if I should buy a VPS from a local host or someone overseas as we don't have the greatest internet speeds here. Are there countries you would prefer to host your ...
0
votes
1answer
2k views

Dell PERC 6/i RAID Performance Testing

We recently received a new Dell R710 with a PERC 6/i RAID controller and six 15k SAS drives. I have been doing some performance testing using hdparm and seeker on two different configurations and I'm ...
1
vote
1answer
105 views

How to get similar performance with hyper-v r2 and native server with sql 2008 server?

We currently have a physical server with 4 physical cpu. Which will be the best VM configuration for SQL Server? If I configure my native server I will have much better performance because I will ...