Performance tuning is the process of modifying a system to improve its efficiency. This is also known as optimizing.

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4
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2answers
676 views

ratelimit POST requests

Im running a large wordpress multiuser site. I have a varnish cache infront of the wordpress application server. As it make no sense to cache POST requests, i am vulnerable to DOS using lots of POST´s ...
0
votes
1answer
86 views

Server stops responding without any load, restart required

Sever is working as a very high-traffic application back-end We are using Apache2, MySql, and PHP. We have already optimized the above for best performance Server configuration is: Linux ...
0
votes
2answers
3k views

How can I configure Apache to use more of my CPU?

Apache threads are stacking up on one of my web servers (300-500 simultaneous requests, some taking 3-8s to process!), but CPU usage is very low (~10%). Page load time is slowing way down as a ...
-3
votes
1answer
121 views

Apache optimization needed [closed]

What is the best values for "worker" if you have very very high traffic? Like 500M page views per day? I want to test my server with that much traffic but how can i setup to handle that much traffic ...
0
votes
1answer
302 views

adding new scheduling policy to the kernel

i'm working on a redhat 8 linux and i want to add new policy for scheduling the processes , could you help me with : 1) where to define the new policy 2) how does the process of assigning a policy for ...
1
vote
1answer
3k views

Memcached Cluster - better to have 3 smaller instances or 2 mediums ones?

Currently I have 2 small servers in an memcached cluster. We are approaching out limits with them and need to grow. What are the pros/cons or going adding another small instance compared with having 2 ...
-1
votes
1answer
650 views

Tuning JavaVM on AWS/EC2

there's some specific tuning JVM configuration for AmazonWS/EC2 building blocks (small, large...)? Somebody have suggestions for tuning JVM running on these machine profiles? Regards, And Past
1
vote
1answer
990 views

NGinx vs Varnish as a reverse proxy in front of Apache w/php [closed]

I am using apache with mod_php to serve content. Mostly the content is fetched form memcache over the network. All of my images, css and js are already on a cdn What are the pros and cons of putting ...
0
votes
2answers
101 views

Server configurations for hosting MySQL database

I have a web application which uses a MySQL database hosted on a virtual server. I've been using this server when I started the application and when the database was really small. Now it has grown and ...
1
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2answers
257 views

I'm seeing performance problems with postfix accepting mail when the queue is already large, any suggestions?

I use postfix to do final delivery for a mail system I've written. So this postfix installation only accepts mail from me, and bounces. When the postfix queue is empty, it can accept a piece of mail ...
0
votes
1answer
948 views

Oracle Application Server Performance Monitoring and Tuning (CPU load high)

Oracle Application Server Performance Monitoring and Tuning (CPU load high) i have just hired by a company and my boss give me a performance issue to solve as soon as possible. I don't have any ...
3
votes
3answers
558 views

httperf hangs when using --hog

I'm using httperf from a large ec2 instance with ubuntu 10.04 (no other software installed). When I test without --hog the tests run however when I use --hog the tests never end
3
votes
2answers
417 views

Tuning MySQL and Linux to reduce maximum response time specifically

We have a MySQL-based application that is very response time sensitive. A MySQL stored procedure needs to respond on average in less than 10 milliseconds and the maximum acceptable response time is 50 ...
4
votes
1answer
511 views

Ubuntu HTTP latency falling into strange quantiles

I have an Ubuntu 10.10 server with plenty of RAM, bandwidth and CPU. I'm seeing a strange, repeatable pattern in the distribution of latencies when serving static files from both Apache and nginx. ...
0
votes
1answer
253 views

Windows 2003 IIS webserver (testserver) is slow

I have a test environment for my Asp.Net 4.0 web applications. It runs on a Dedicated Windows 2003 Webserver (IIS 6) But it's slow! The machine never has 100% cpu and the same for memory. When I run ...
2
votes
2answers
2k views

Apache with prefork model using 1000 MB memory per process

I am currently working on a site which uses Apache running on the prefork memory model. The following is the configuration from httpd.conf <IfModule prefork.c> StartServers 30 ...
0
votes
1answer
666 views

Improving TCP performance over a network with small packet loss

I’m trying to improve my TCP throughput over a “high delay network”, with some packet drops, between Linux machines. I set tcp_mem, tcp_wmem and tcp_rmem to “8192 20530752 20530752”. I set rmem_max, ...
13
votes
3answers
4k views

Building a 1,000M row MySQL table

This question is reposted from Stack Overflow based on a suggestion in the comments, apologies for the duplication. Questions Question 1: as the size of the database table gets larger how can I tune ...
1
vote
1answer
749 views

How Do I Troubleshoot Exim Mail Retry Issues?

My server is encountering high CPU load (like almost pegged at 100%) so much that the Apache service can't run and we get Apache 500 errors. We used a script to catch this and this is where we ...
1
vote
1answer
2k views

Windows Server 2008 File Server Performance Tuning

I am running a Microsoft Windows Server 2008 R2 File Server on our network. It seems that there are many times where accessing the data from the server is really slow, sluggish, or non-responsive. ...
6
votes
2answers
3k views

what does locked % in mongostat mean?

When running mongostat to look at our mongo database, I'll frequently see the locked % number jump up, sometimes as high as 80%. Here's a few example rows: insert query update delete getmore ...
0
votes
1answer
401 views

Trim out useless apache modules

I'm running a shared hosting environment with about 100 sites - I just took a peek at all the modules apache is loading/using, some of these I don't know what they are or do or if they are useful at ...
0
votes
1answer
782 views

Increase bandwidth of Linksys WRT54GL (with Tomato inside)

I have Linksys WRT54GL with Tomato firmware installed. When I connect internet cable directly to a computer I can download at about 8 MB/s, however when internet is access through the router maximum ...
1
vote
3answers
2k views

Increasing Postfix Performance for Outbound Mail

We're trying to optimize a Dell PowerEdge 1850, Dual 3GHz procs, 3072MB RAM, running Postfix 2.8.4 and signing mail with OpenDKIM 2.4.1. iostat -x output is: avg-cpu: %user %nice %system %iowait ...
-1
votes
1answer
214 views

Linux script to check settings and recommend tuning changes? [closed]

I'm searching for a script to run on our linux server and recommend various tuning changes we might consider making, as well as their suggested values for consideration. Any ideas if something like ...
0
votes
4answers
2k views

How to check for bottlenecks in Windows Server 2008 R2

I recently switched out a 10 year old server for a brand new server in a small office and upgraded from Windows Server 2000 to Windows Server 2008 R2. After the switch was complete and some ...
0
votes
3answers
1k views

How to speed up apache

We have a server with 8Cores, 16GB of RAM and RAID 0 SAS 10K drives. Our goal is to use this to serve a fairly simple php application quickly. We have tested all other components and we think we have ...
1
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2answers
177 views

SQL performance, how to exactly measure bottlenecks

Yesterday me (programmer) and one of my coworkers from our Hosting department started series of tests to address performance issues with our websites. We are running a server with Windows Server 2008 ...
0
votes
1answer
935 views

IIS6 - Classic ASP - “out of memory”/“out of string space”

We have a classic ASP application that's under significantly more load than usual. We are from time to time been getting "out of memory" and "out of string space" in the httperr. We do not usually ...
0
votes
2answers
895 views

MySQL Memory usage

Our MySQL server seems to be using a lot of memory. I've tried looking for slow queries and queries with no index and have halved the peak CPU usage and Apache memory usage but the MySQL memory stays ...
0
votes
4answers
485 views

Increase application performance on Amazon AWS

I've got a client with an MVC v1 (.NET) application running on a micro instance. On this instance, I've got .NET, IIS 7.5, and MS SQL Server 2008 running to handle the application. The client has ...
2
votes
2answers
143 views

Does deleting unused files such as images, javascript, xml, html, asp etc make your Windows Server faster?

I have an IIS7 Windows 2003 Dedicated server. I just wanted to know if I delete old files such as XML, HTML, ASP, PHP, images, CSS, JavaScript.. etc.. files that are no longer used.. Does this ...
7
votes
1answer
6k views

Interpreting ethtool Coalesce output

Other than tx and rx being the transmit and recieve, can anyone explain what the fields mean in ethtool -c's (Coalescing output) and what effect they have on how coalescing works? Coalesce parameters ...
3
votes
2answers
2k views

How to adjust MySQL performance

I'm facing a real problem with MySQL instance for a service online. We use hibernate and c3p0 pool with these settings: c3p0.max_size=200 c3p0.min_size=5 c3p0.timeout=60000 c3p0.max_statements=20 ...
3
votes
2answers
611 views

PostgreSQL tuning recommendation for large server and dataset

I'm working with a PostgreSQL (8.1) server on a dedicated machine with 64 GB of RAM and a fast RAID disk. The data set itself is pretty huge -- we have several tables around 200 GB, more in the 50-100 ...
1
vote
2answers
152 views

How to connect an Oracle server between two countries and maintain high speeds for read & write

Our company has two branches, one in Malaysia and the other one in India. The problems occur when we try to share one of our Oracle environments to our branch in India; the connection is very slow, ...
1
vote
2answers
453 views

Troubling AB benchmarking result?

I'm a real noob when it comes to sys admin. I'm running an app on an EC2 MicroInstance. Before I launch publicly, I want to make sure that I hit a minimum level of performance. I'm trying out some ...
1
vote
2answers
762 views

Establish a performance baseline for terminal server windows machines

I need to establish a performace basline for our Terminal Server machines. i plan to use perfmon , and will have a SCOM server on the site very soon. The terminals are used as a desktop environment ...
0
votes
4answers
335 views

Trying to scale my dedicated server for high traffic

I have a quad core xeon, 8GB ram, and only 2 x 1TB SATA drives right now. I am trying to figure out how to scale my application to handle as much load and traffic per day as possible. I have an ...
2
votes
1answer
1k views

InnoDB options crashing mysql start AND mysql tuning

I have an innodb on a Ubuntu 10.10 server running on an ESXi platform. I have dedicated 8 CPUs, 32 Gigs of ram, and files stored in a Raid 5 HP SAN of SAS 10k rpm disks. I'm expecting FAST queries! ...
0
votes
1answer
858 views

MySQL hosting: What are the recommended specs and w

I have two specific cases of MySQL hosting. 1) I have a case where I have 2000 plus concurrent users to a single MySQL Database. They are not simple web users, but actual business users who need to ...
0
votes
1answer
268 views

ionice or chrt for Bonnie benchmark

I am running Bonnie benchmark on an embedded device and I am getting variable results for every run. I am contemplating using ionice and / or chrt to get around it. Can you suggest which option is ...
2
votes
5answers
506 views

Figuring out what's causing a server to slow down

I have a potential client that has a php site that performs fine most of the time. However, every week or so, it will experience lag (slow page loading). I am sure there are a myriad of things that ...
0
votes
2answers
104 views

what to check for limitations if a linux machine maxes out at a certain connection/s

I have a linux machine with a dummy HTTP server on it. It accepts a certain number of connections/second. Neither the CPU (it is a multicore) nor the memory nor IO are exhausted. What else can be ...
0
votes
5answers
2k views

Very low performance of raid6

I noticed that writing to raid-6 is very low, but when I make tests with hdparm the speed is reasonable: dd if=/dev/zero of=/store/01/test.tmp bs=1M count=10000 Gives: 50Mb/s or even less. The ...
2
votes
1answer
319 views

Do IIS App Pools using Network Service account share memory?

We're trying to tune our IIS farm, and I'm trying to get my head around how Windows allocates resources in our current setup. We have a pretty standard layout. We host 30+ ASP/ASP.NET sites on our ...
2
votes
5answers
415 views

Does Overclocking Anything Shorten It's Life? [closed]

From a business standpoint... If intel could take a 3.0 GHz CPU, and overclock it to 4.0 GHz - whilst still covering their warranty they would do so. It's absolutely free and makes the chip perceived ...
6
votes
2answers
6k views

Best sysctl.conf configuration for high load - extremely busy content streaming server

What is the best sysctl.conf configuration for a high load, extremely busy content streaming server ? The server fetches the content from remote servers like amazon, s3, etc. then uses php to ...
1
vote
1answer
629 views

COM+/Desktop Heap errors in IIS affecting sites at random?

We have a Win2K3 server that is hosting 30+ sites. Each site is configured to have its own unique application pool -- so that we can manually recycle specific sites if needed and not kill sessions ...
1
vote
3answers
345 views

Config MySQL to maximum speed and memory

I have a server, 8 cores, 12 GB RAM. This server is only used to run MySQL. So, help me config /etc/my.cnf to maximum speed, memory for MySQL.