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

learn more… | top users | synonyms (2)

0
votes
1answer
168 views

Unexplicable extreme slowness on Dell PowerEdge R320, fixed only by cold reboot

At this customer's site, there are two new Dell PowerEdge R320 servers with the following configuration: A single 6-core CPU 16 GB of RAM 2x500 GB SATA disks in a RAID 1 array The O.S. is Windows ...
1
vote
0answers
12 views

Performance: Generating up to 2000 rows and email deliveries

I guess this belongs here better than in StackOverflow. I have the following scenario: Small database with users ( around 2000 only ) information, they participated in an event last year. This year ...
0
votes
0answers
16 views

How efficient is the tac command on large files

The taccommand (catreversed) can be used to read a file backwards, just like cat reads it rom the beginning. I wonder, how efficient this is. Does it have to read the whole file from the beginning and ...
0
votes
1answer
911 views

htcacheclean doesn't seem to be cleaning the cache

I'm running mod_cache with apache 2 on a fairly high traffic'd site. I've set the htcacheclean to run in demon mode every 10 minutes to keep the cache at 4GB. It's currently at 15GB and doesn't seem ...
0
votes
0answers
15 views

Any benefits of VT-x for 32bit guest on VirtualBox? [on hold]

I am going to be deploying a network of 32bit guest systems using VirtualBox. I will be running one core per VM (but multiple VMs per host), memory usage is low (<512MB per guest). Is there any ...
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 ...
2
votes
1answer
997 views

How to achieve multiple NFS/TCP connections to the same server?

I'm trying to maximize the NFS/TCP bandwidth between a Linux client and a single NFS server over a 10Gbps link. Although each NFS mount has its own device (major/minor), everything comes down to a ...
0
votes
0answers
14 views

MongoDB hogging IO but it doesn't show in mongotop or mongostat

Iotop says mongod is using a lot of IO (96.32%) for a long while but mongotop and mongostat show a bunch of zeros. How can I better monitor mongodb and find out what's happening?
0
votes
0answers
4 views

Why is cURL slower than wget [migrated]

Test page: https://www.beobank.be/nl/Home.aspx This is the result using wget (or a real browser): # time wget https://www.beobank.be/nl/Home.aspx -O /dev/null --2015-01-26 12:05:46-- ...
0
votes
4answers
199 views

Need advice about network distance & speed

My company has two office locations about 200 meters from switch to switch, and at the moment the network speed between our two networks is really slow. The network is a 100Mb network with 2 ...
2
votes
3answers
2k views

High disk I/O activity in CentOS server

I have about 16 websites in a CentOS dedicated, and I am having some problems on high traffic hours, it seems to be a high disk I/O activity causing a general slowdown. I've installed atop and this ...
0
votes
2answers
144 views

pagefile and disk space monitoring on server 2012

I have had a server crash recently because of the disk space. Here is what I have: a Hyper-V 2012 server with 1 win 2012 image physical disk is 500GB server uses 800GB It was OK for half a year but ...
0
votes
1answer
60 views

Any possible side effect to use APC on shared host? [closed]

I'm using a shared host for a CMS site. This shared host has an option to use "APC". I just tried this option on a test site as it can be enabled just by one click on my account page of the shared ...
5
votes
1answer
1k views

Does APC really improve performance with PHP 5.3+

According to a Linux Adminstrator over at Hostgator: With PHP 5.3 having APC installed is not needed as PHP 5.3 already has improvements that APC does resolve in it. Is that statement actually ...
1
vote
1answer
197 views

Site performance - Akamai

We're facing performance issues in one of our servers which is hosting a website with ~50k users a month. We've been discussing different options to improve the performance and we're currently using ...
-1
votes
0answers
24 views

Windows Server 2012 PerfNet error: (2006) Unable to read Server Queue performance data from the Server service [closed]

I have seen the Windows Server 2008 bug, but what about Windows Server 2012? PerfNet event error (2006): Unable to read Server Queue performance data from the Server service. The first four bytes ...
1
vote
0answers
286 views

virtual directory make file copy operation extremely slow on UNC Path (IIS 7.5 bug?)

When i create a website/virtual directory pointing to UNC path, its make our file copy extremely slow on the UNC path. 6 seconds for file copy (~13 M) on the UNC path without any virtual ...
0
votes
1answer
822 views

Troubleshooting MySQL Performance Issues

Environment: 1 physical machine 8GB RAM some older Core2Duo CPU 1 HDD Windows Vista 64 bit 1 Virtual Machine 16 GB RAM 2 vCPUs Windows 7 64bit Both machines running MySQL 5.5.28 (64Bit) with ...
0
votes
0answers
12 views

Python libraries slow to load from NFS mount point

Several of our computers are diskless, and they load their Python libraries from an NFS mount point across the network. This means it can take up to three minutes to start up a Python process that ...
0
votes
1answer
27 views

How to determine performance improvement from precompiling ASP.NET site?

I have an ASP.NET (non-MVC) site that is deployed to IIS. I've setup the precompile options (for deploy/publish). Settings are below in the image. I've tried a variation of the settings below and from ...
0
votes
1answer
22 views

maximum performance on fedora 21: minimal or server? [closed]

THE QUESTION: what gives the fastest performing fedora 21? the minimal install or the server install? server installs 615 packages according to graphical anaconda, minimal installs around 200 (of ...
0
votes
1answer
38 views

Slow serving of static files with IIS 8

We're hosting an ASP.Net MVC web app on Windows Server 2012, which runs over HTTPS. Most of the time everything is nice and fast, but we've noticed that about 1 in 50 requests for static files (e.g. ...
1
vote
0answers
55 views

finding if my linux server is the bottleneck

I have a redhat linux 6.x server being used for writing of backup images by NetBackup before being dedup to tape library. currently, I have at least 20 servers writing to it every time their backup ...
1
vote
2answers
1k 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 ...
-1
votes
0answers
22 views

Application very slow - is this due to load [closed]

I have upgraded my application on Linux instance. The application is very slow. I am trying to find the root cause for that. This is the output of the top command [jira@JRAQAV20 logs]$ top top - ...
7
votes
6answers
3k views

SMB claimed to be “slow”

Our company network (which I believe is a windows domain run on server 2008) is painfully slow. A prime example of this is copying files over SMB - listings take minutes, and copying even modestly ...
0
votes
0answers
23 views

Counterintuitive drop in CPU

I am running a memcached service in a linux container pinned to a specific physical core. As expected the CPU increases when the number of requests increase. The requests are sent from a workload ...
0
votes
1answer
957 views

Performance Issue Between SQL and IIS on Seperate Machines

First time OP on serverfault, but an avid user of stackoverflow. We have two high-specification boxes, both running Windows Server 2008 R2 Standard. On one we have IIS 7.5, the other SQL Server 2008 ...
1
vote
1answer
24 views

Does it make sense to remove NFS from a simple web server?

Does it make sense security- and performance-wise to remove NFS on a simple server which has ~10 Wordpress websites? Or is simply stopping the services enough?
14
votes
11answers
3k views

Would rebooting the server in a schedule be good idea for performance?

I am wondering if rebooting a server in a schedule would be good idea for performance. Let's say we want to reboot the server at 02:00 AM per 2 nights. The server here is Windows Server 2008 R2. ...
2
votes
1answer
38 views

Parallel Processing and Disk IO for performance. More cores or more servers?

I have a large analysis job on an AWS EC2 instance (c3.8xlarge) on Ubuntu 12.04. The objective is to load the server at 100% CPU, running as many jobs as memory allows (varying amounts but generally ...
0
votes
0answers
28 views

Strange performance issues on CentOS KVM guests

I have a very basic hypervisor server. It is based on consumer hardware and does have some quirks, so I'm not excluding hardware issues. Guests on this machine have strange performance issues, it ...
2
votes
1answer
3k views

MySQL high CPU usage on small website

I have a small website hosted on a dedicated server (FreeBSD 9.2, MySQL 5.6.1 and php 5.5.5). The problem is that MySQL eats a lot of cpu resources even if the website have a few visitors. The ...
4
votes
2answers
84 views

Multiple websites on multiple servers - seperate mysql or not

I currently have 2 Debian servers (VPS with 4 GB memory) and am hosting a variety of websites of differing importance: some are production sites, while others are demo/staging/test sites. ...
-4
votes
0answers
16 views

Server Hardware Configuration For Performance Testing [duplicate]

What is a good server hardware configuration for performance test? How can I understand how much Ram, Cpu and ... I need?
1
vote
0answers
34 views

Linux fixed file size copy from Windows Server 2012 NFS share

Company is in the process of switching from hosting MongoDB on windows server 2012 to hosting on linux(ubuntu 14.04) Current backup and restore strategy involves copying all the data files via ...
4
votes
2answers
705 views

Which CentOS Version Should I Use?

I have some used rackmount servers (Dell R610, HP DL180 G6, HP DL360 G5) that I intend to use for on demand video streaming in a colocation environment. I would like to have them all on the same OS to ...
2
votes
1answer
893 views

BackupExec 12 + RALUS - VERY slow backups

We use Backup Exec 12 and the Remote Agent for Linux/Unix Servers (RALUS) to backup a large RHEL5 system. For various reasons we need to do a daily working set job. These working-set jobs run ...
0
votes
0answers
13 views

Troubleshooting Rails 3 application performance problems

We deployed some apps upgraded to Ruby 1.8.7, Rails 3.1.11 on Dec. 30 (i know, we're in perpetual upgrade mode, targetting Ruby 1.9.x now..). One of the apps' performance has been poor since then, ...
2
votes
2answers
340 views

What does RXTX Factor mean, what is it and how does it affect my server?

In the Rackspace overview for their next gen servers they have a table of flavor options. In the table there is a column called RXTX factor with no explanation. I tried googling, but couldn't find ...
0
votes
1answer
933 views

Why is hash join slow in postgresql 9.1?

I transfered my DB from Postgresql 8.4 to new server with Postgresql 9.1. Size of DB is 9.9GB Data directory is situated on ssd 60GB disk. And server has 16GB RAM and 16 proccessor cores. But today ...
4
votes
1answer
69 views

psping to localhost - improve throughput

I'm using following psping command to measure the bandwith throughput for localhost on a physical server psping -4 -b -l 8k -n 20000 localhost:1234 The throughput is around 150MB/s wich isn't all ...
-2
votes
0answers
12 views

initial Connection to Mysql is slow [migrated]

My intial connection time from my azure IIS server to my VM having mysql is Connection time: 0.04 However subsequent connection times are well under 0.01 Connection time: 0.01 I dont think this ...
0
votes
1answer
23 views

Measuring request response time by port

So, I'm currently working on a project in which I spin up a set docker image on a number of different machines and configurations. This image basically contains a web server that accepts a number of ...
2
votes
5answers
2k views

Why does this SQL run so much faster in a Oracle server with the same hardware/data than another Oracle server?

My application has a SQL that takes ~ 30 min to run in the Oracle server in production. It takes about the same in a test Oracle server. For some reason, in another Oracle server, it runs much ...
1
vote
1answer
79 views

How to troubleshoot an unresponsive server

I'm performance testing my Java based web application (Grails) that is deployed on Tomcat. The server has the below services running on it: Apache HTTPD Apache Tomcat MySql RabbitMQ Even though I ...
-1
votes
0answers
22 views

Slow disk performance in Docker container [migrated]

Problem I have some extremely slow disk IO within a Docker container. I'm using Boot2Docker, so i'm actually now wondering if the issue is vboxsf? Testing I used this script initially because I was ...
2
votes
5answers
3k views

Downloads pause and time out frequently

I'm a new systems and network admin. My experience has been in the hardware and software of systems and servers, the network part is pretty new to me. I'm familiar with plugging numbers into network ...
7
votes
3answers
2k views

Apache on Win32: Slow Transfers of single, static files in HTTP, fast in HTTPS

I have a weird problem with Apache 2.2.15 on Windows 2000 Server SP4. Basically, I am trying to serve larger static files, images, videos etc. The download seems to be capped at around 550kB/s even ...
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. ...