The performance tag has no wiki summary.
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3answers
194 views
What database server will benefit from 4 CPUs
I use MySQL server on Debian GNU/Linux machine with 4 CPUs (Linode 4096) and there are performace issue on havy load (in the middle of the day) but machine is not overload only queries are slow.
What ...
3
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0answers
21 views
Is WinSAT reliable to test the speed of my iSCSI, Fibre SAN, under bare metal or Virtualized?
I discovered the following command in this whitepaper:
WinSat disk -read -ran -ransize 4096 -drive c
Is it reliable to use against a SAN, or iSCSI drive? I would like to compare the output of ...
2
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2answers
42 views
Is there guidance to optimise W2008R2 threading performance?
I want to make sure that my W2008R2 box has least possible interrupts and context switches on the CPU threads.
I have 4 cores / 8 HT threads CPU. I am running a single application which uses only ...
1
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0answers
30 views
Windows 2008 R2 - how to optimise performance monitoring?
It seems there are quite a few "default" monitoring threads running.
I have W2008R2 and when I opened Performance Monitor I can see 6 Event Trace Sessions in the System collector sets.
This is ...
1
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2answers
67 views
Ridiculously slow queries on Microsoft SQL Server 2008 R2
I'm getting really slow queries in MS SQL Server 2008 R2 on my dev machine. This problem has been plaguing me for about a month. Other developers don't have the same problem, but we all run the same ...
1
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2answers
35 views
16tb raid6 + lvm, to partition or not to partition?
So I have a 16tb raid6 on one of a new batch of machines I am setting up. I will be using LVM on top of this and am wondering if there are any compelling reasons to break the raid up into partitions ...
1
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1answer
29 views
Performance issues with Exchange 2007 and Outlook 2010
In my environment, I have Exchange 2007, ccr environment with 2 MB, 2 HT, and 2 CAS servers. We are currently using Outlook 2010 as our email client for the terminal server. The client is configured ...
2
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4answers
104 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 ...
1
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1answer
27 views
Adding extra processor post-installation versus installing on two - 2008 R2
I have a Windows Server 2003 installation which is getting pretty long in the tooth, so I have decided to install Windows Server 2008 R2 Standard instead. I have verified that the server is capable of ...
2
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2answers
77 views
Very high CPU and low RAM usage - is it possible to place some of swap some of the CPU usage to the RAM (with CloudLinux LVE Manager installed)?
I had to install CloudLinux so that I could somewhat controle the CPU ussage and more importantly the Concurrent-Connections the Websites use.
But as you can see the Server load is way to high and ...
0
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1answer
28 views
Which JBoss version should be choose?
We are now developing and running a java web application under JBoss 4.2.3 for many years. We using Struts 1 + Hibernate 2 as the framework. We don't using any EJB things.
My question is should we ...
4
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1answer
87 views
How should I tune apache when I see high CPU, but low memory usage?
My CentOS web nodes (LAMP stack) are experiencing high CPU usage but low memory usage. Nearly all of the processes are apache. I know I could just add additional web nodes until my cpu usage becomes ...
7
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3answers
190 views
How to calculate cost/benefit of hardware expenditures? (move to virtualization, upgrades, etc.)
Preamble:
As part of the acquisition of a smaller development company we have acquired a new office. Many people were transferred to head office, but 'new' office will retain a small team of 4-6 ...
2
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0answers
58 views
How Can I Isolate What is Slowing Down an Office Network? [closed]
The company I work for has very limited internet bandwidth in the office (~ 3.0MB). I believe that is 3 up and 3 down. Normally, the speed is sufficient, however, periodically it comes to a ...
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0answers
17 views
OpenSTA performance testing
I try to run some performance tests through OpenSTA. Here is the setup:
Windows 7 (4 core, 8GB RAM) running Apache Web Server; Windows XP SP2 virtual machine running on the same physical computer, it ...
0
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1answer
25 views
OS X tools for testing & visualizing network performance between two points
A client of mine has had intermittent network issues between their office and their server hosted on AWS.
A speedtest (at speedtest.net) shows their bandwidth is fine.
When I test their server, from ...
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0answers
23 views
performance degradation moving from iis6 to iis7
I am transferring a C# asp.net asmx web service to windows 2008 and iis7 (64 bit) on a vm, from ii6 (32 bit). I got an approximate web method performance time of about 160 ms before. On iis7, I'm now ...
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0answers
13 views
Linux RHEL-W 6.1 laptop slows suddenly with fan running hard [migrated]
I have an 8-core Linux laptop that's been working fine, but the last couple days of last week it started to suddenly run slowly. My project build takes about 8 times longer than normal. The fan will ...
0
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1answer
31 views
Querying a web API vs local database during a traffic spike?
I wasn't sure whether this was best suited to SO or SF, I originally posted this on SO - Link to original - but it seems to me now that it probably is better suited to SF. Moderators please feel ...
3
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3answers
116 views
Apache performance issue, after “1000 total children” Apache no longer responds to HTTP requests. Not MaxClients issue?
Hoping someone can point me in the right direction as I've spent the last week trying to figure out where the "issue" is but haven't been able to, tried posting to the Apache users mailing lists but ...
3
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2answers
63 views
Is DNS caching common in production Ubuntu server
In Ubuntu, DNS is not cached.
So if my program use a lot of DNS queries and it will be plainful.
I knew in RHEL, they have nscd installed by default, so in Ubuntu, if I want to use the server as a ...
3
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2answers
70 views
Unable to increase the dynamic port range on Windows Server 2008
I'm trying to "tune" the TCP/IP stack on some Windows Server 2008 machines by following the instructions here: ...
1
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1answer
50 views
MySQL high “sy” (kernel) CPU time
My MySQL server runs about 100 writes and 500 reads per second. The CPU usage looks strange to me. "us" (user) time shows 2-8%, while "sy" (kernel/system) time often shows 50+%. Here's some vmstat ...
1
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0answers
34 views
Poor SSL performance with vsftpd
I'm trying to tweak vsftpd to achieve maximum performance for my usage:
I have only one or two clients that connect to the server.
File size is between ~15MB and 1GB.
Typical transfer batch ...
0
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2answers
40 views
How do you know when you need a new server? [closed]
Lets say you run a simple web app, everything is going fine and number of clients are always going up. You know you will need a new server soon - but not quite sure when. Of course you wouldn't want ...
1
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0answers
105 views
8 hard drives, very same model, software RAID0, terrible performance [migrated]
I have 8 hard drives in my PC, assigned as storage.
Three of them are attached to the mainboard.
Four of them are attached to a controller [ SiL 3114 ]
One of them attached to an another ...
0
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1answer
50 views
How much resources should backup tools be using? ( issues with clBackup )
My hosting provider makes backups of our servers using a tool called clBackup which pushes files over the network. Below is one ps output we took and reported to our provider:
top - 10:06:24 up 25 ...
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0answers
27 views
Web Service gets unavailable after several concurrent calls with short connection timeout
I run JMeter as a Client App to simulate 30 concurrent users sending 100 SOAP requests each to my web service. By mistake I put 10ms connection timeout. After JMeter starts running my test, almost ...
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0answers
35 views
Adding a file server or adding SAS to our current server: weak hard disk performance of our current server?
Our server now has 2 hard disk SATA RAID 0, I tested the performance of the server and it is clear that the problem is in the performance of the hard disk,
we have 50 pcs, 35 ones use shared folders ...
0
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2answers
39 views
light web server to run on vps
Has anyone tried to build a really light server that uses the least amount of space and memory, while giving high performance?
I would assume that linux kernel can be configured to keep only ...
1
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2answers
40 views
Iozone is producing false results
I am not sure why this is happening but these are totally false results:
Children see throughput for 15 re-readers = 12793134.62 KB/sec
Parent sees throughput for 15 re-readers = ...
1
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2answers
59 views
Apache2 on linux - how to track down performance trouble
I am stuck on this topic for a while now: How can I get more details on where response time burns.
My Problem is the extreme variance in response times. Sometimes it takes the server 5 or 10 seconds ...
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votes
3answers
80 views
Ngix vs G-WAN for static content? [closed]
Can someone point me to recent benchmarks on the two? Also more info about G-WAN would be nice, since up until now I never heard about it. I need the fastest server for static files.
0
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0answers
38 views
Combined random and sequential I/O for a database
We need to size a storage that will host the datadirs of many running slave instances of MySQL. The storage shall be connected to a single server that will run all the slave instances.
On the ...
-1
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1answer
69 views
Optimized LAMP/LEMP stack scripts
In the "let's try not to reinvent the wheel" perspective, I've been looking for a packaged LAMP (or LEMP) stack for some time now, not only the basic Mysql, Apache , PHP etc... but ideally stuff like ...
1
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3answers
50 views
How to track down uncertain httpd/mysqld activity
I'm running a pretty standard LAMP stack on Fedora 15, mostly in support of some Drupal sites. Things generally seem to be running fine, but occasionally the disk on the machine will start to work ...
0
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0answers
30 views
`Add Role` not working on Amazon EC2 Free Tier Windows Server 2008 VM
I am experimenting with Amazon EC2 and I have setup a Windows Server 2008 Datacenter 32 bit Free Tier Virtual Machine.
The specs are kind of low (Single Core Xeon E5430 2.7Ghz, 615MB RAM) but they ...
7
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2answers
166 views
Troubleshooting strategy for very poor iSCSI/NFS performance
We have a new Synology RS3412RPxs that offers iSCSI targets to three Windows 2008 R2 boxes and NFS to one OpenBSD 5.0 box.
Logging into the RS3412 with ssh and reading/writing both small files and ...
0
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0answers
124 views
tuning low memory apache server for “high traffic” web
I get between 3500 and 5500 visits a day on a beta web app that I developed and launched a couple of months ago. The app has no use of a database and has very few files, so mysql queries and file ...
3
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2answers
61 views
How to investigate peak in MySQL throughput?
Recently one of our servers has ran out of memory and crashed. After reviewing the munin graphs, it appears that the only metric (other than memory usage) that peaked just before the crash was the ...
0
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2answers
165 views
Isilon Storage & Mac OSX samba connections
So we have a Isilon Storage Cluster, and both Windows and Mac Clients connecting to it. Windows (for obvious reasons) connects and performs extremely well using SMB.
OSX on the other hand, does not. ...
0
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0answers
74 views
Slow data transfer from shared folder on Ubuntu 11 Server
I have a Virtual Machine running on VirtualBox, on which I installed Ubuntu 11 Server (I left it "plain vanilla", it just runs Apache and MySQL). I created a shared folder with Samba and I can access ...
7
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2answers
174 views
Network performance deteriorates when uninvolved device on switch is shut down
I am witnessing very counter-intuitive effect in my network setup.
I have a network setup with three devices (let's call them server, laptop and nettop, all running Linux, details below) connected to ...
-1
votes
1answer
71 views
Error message when trying to start varnish on centos 5.5
I just installed and configured Varnish to work on port 80, and Apache to work on port 8080.
I am trying to start Varnish with the command service varnish start, but it gave me this error:
...
0
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0answers
177 views
sysctl tcp_max_syn_backlog dont work
I change value tcp_max_syn_backlog in sysctl in my ubuntu server 10.04 for growing SYN_RECV queue. But isnt work (I flood this server by hping). But, when i change somaxconn (in documentation its ...
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0answers
27 views
Full Text Search query elapsed time varying wildly
Database Version:
Microsoft SQL Server 2005 - 9.00.4035.00 (Intel X86) Nov 24 2008 13:01:59 Copyright (c) 1988-2005 Microsoft Corporation Express Edition with Advanced Services on Windows NT 5.1 ...
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3answers
554 views
How to use 2 SSD disks for best performace?
I am going to format 2 120GB Intel 320 SSD to be used for a high traffic Drupal server. The server had Xeon E1270 CPU and 32GB RAM. I'm using Debian Squeeze 64 bit. Here are my questions:
What ...
0
votes
1answer
65 views
SQLSTATE[HY000]: General error: 2006 MySQL server has gone away
Server details:
RAM: 16GB
HDD: 1000GB
OS: Linux 2.6.32-220.7.1.el6.x86_64
Processor: 6 Core
Please see the link below for my # top preview:
I can often see the error mentioned in title in my ...
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votes
2answers
88 views
How to find out what is causing a slow down of the application on this server?
This is not the typical serverfault question, but I'm out of ideas and don't know where else to go. If there are better places to ask this, just point me there in the comments. Thanks.
Situation
...
0
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1answer
58 views
How to provision hardware for virtualbox? [closed]
In our organisation we are planning to get new machines for developers. The requirements are that the developers should be able to run upto 3 VirtualBox virtual machines in parallel. The usage pattern ...
