A bottleneck is the place where transmission is the slowest.
2
votes
1answer
50 views
May a low DRAM router be a bottleneck for a LAN?
I need to install a LAN that is a hybrid between a star LAN and a cascade LAN. There are two levels (I mean that the maximum number of link to go from the central switch to the most external switch is ...
2
votes
4answers
455 views
Flush-0:n processes causing massive bottleneck
I have a LAMP cluster that shares files via NFS and occasionally one of them will be stricken for a while when mysterious flush processes start appearing.
Can anyone help me? The only way to resolve ...
8
votes
6answers
672 views
Linux I/O bottleneck with data-movers
I have a 24 core machine with 94.6GiB RAM running Ubuntu server 10.04. The box is experiencing high %iowait, unlike another server we have (4 cores) running the same types and amounts of processes. ...
0
votes
1answer
146 views
Server hard disk read speed and client download speed, is there a connection? [closed]
Ok so a client's download speed is only as fast as a server's upload speed, and vice versa. Based on the answers to this post:
Does upload speed depend upon download speed of the server?
In other ...
1
vote
0answers
91 views
Good Perfmon Counters for Initial Troubleshooting
I increasingly deal with users who complain there "computer is slow" or that "it takes forever to load" on the laptops we provide (fairly standard build of Windows 7 32-bit with Office 2010 and a few ...
0
votes
3answers
724 views
Performance monitoring on Linux/Unix
I run a few Windows servers and (Debian and Ubuntu) Linux and AIX servers.
I would like to continously monitor performance on these systems in order to easily identify bottlenecks as well as to have ...
2
votes
1answer
196 views
Solaris/UNIX: Does snoop have the potential to slow down network traffic?
This is the way I see it.
A copy of the network activity is written to a buffer, and snoop reads from the buffer. As long as snoop is able to get the data out fast enough (writing directly to a file ...
1
vote
1answer
138 views
Server freeze (Disk I/O possibly)
I have a Windows Server 2008 machine that is resyncing disks after a powerloss. The issue is that the system becomes unresponsive after about 10 minutes. We've checked with resource monitor and found ...
1
vote
1answer
650 views
Mysql hangs up the server. How to avoid this?
Sometimes my website 'goes down' due to Mysql consuming all the resources, but I think it does not stop creating more httpd processes. Is that possible? If I restart apache, these processes disappear ...
0
votes
2answers
1k views
What iowait values are ok?
I am trying to find the bottleneck of a server running a fairly busy php/mysql site. My first culprit was io but iostat shows that on average iowait consumes only %3.60 of cpu time. here is the ...
0
votes
0answers
386 views
NGiNX performance degrades over time
So here's the situation, I run a small cluster, Dedicated box for MySQL, and a dedicated PHP-FPM/NGINX box, Nginx talks to php-fpm via socket, As far as i can tell the problem does not lie in php-fpm, ...
1
vote
1answer
737 views
Diagnosing the slow performance of my NAS?
I recently built a NAS box on top of ubuntu server. I have an average transfer of about 10mb/sec over gigabit wire to my computer. I was hoping you guys could give recommendations on how to pinpoint ...
2
votes
2answers
93 views
web app reaching emailing limits - what is the next step up?
Recently i have been working on a popular web app that currently has around 70k members and a lot of traffic, i migrated the site to a new extra large EC2 instance and it seems to be a massive ...
1
vote
2answers
558 views
Should I use nginx exclusively, or have it as a proxy to Tomcat (performance related)?
I've planned to create a website that'll be pretty heavy on dynamic content, and want to know what would be the wisest choice for part of my webstack.
Right now I'm trying to decide whether I should ...
1
vote
1answer
380 views
Tangible benefits of keeping web applications and web server separate?
We develop and maintain web applications; and in our current setup; we are using a three-tier system of database server, application server, and web server.
So far, so good.
The problem we are ...
0
votes
3answers
312 views
Where to look for the bottleneck when download slows down?
Image downloading from our site slows down every evening. Compared to daytime we get %50 more traffic over the evening. In exact figures, during daytime hours, hourly pageview count is around 20k, ...
2
votes
2answers
667 views
Steps to diagnose performance bottlenecks on Mac OS X
If you wanted to track down performance issues on a machine running Mac OS X and find out what was causing slowdowns, which command-line or graphical tools would you use, and how would you use them?
...
3
votes
3answers
690 views
How to determine bottlenecks on Ubuntu LAMP environment
What kind of tests should I run to determine bottlenecks on my server? I'm trying to optimize so I can maintain heavy load spikes when they occur. I'm running Ubuntu in a LAMP environment.
1
vote
1answer
452 views
Significant advantages to choosing nginx+PHP-FPM over Apache+mod_php for a Dynamic DB-backed PHP api server?
I am considering using Nginx once again as the primary web server for a REST web-API we need to deploy very quickly(nginx initially chosen for its C10k properties.)
The initial implementation of the ...
0
votes
3answers
293 views
Identifying the bottleneck
So I've got nginx and php-fpm on a cloud server. Using apache benchmark with these settings:
ab -n 300 -c 5 http://example.com/
So the cloud server (from rackspace) was a 256mb one. I ran htop while ...
1
vote
1answer
234 views
How to Build a High Performance Network Traffic Recorder With no Bottlenecks (20Gbps)
I need to build a server which is capable of capturing 20 Gigabit/second network traffic (2 x 10g network adapters - 99% utilization) and store them on a disk with zero packet-lose. The requirements ...
0
votes
1answer
557 views
Looking for a bottleneck in MySQL server
I have two Ubuntu servers with very similar, if not identical, configuration: both have 16 cores (4 E5540 Xeons), 16GB RAM, HP Smart Array P212 controllers with 2 HDDs in RAID1. I/O scheduler used is ...
1
vote
2answers
136 views
Hypervisor load on local disks
What is the I/O load on the local disk system for the host OS in XenServer? I can't find this info anywhere. As we have a SAN for the VMs themselves, can we get away with cheap controller / SATA disk ...
1
vote
3answers
741 views
Very slow harddisk performance
Today I was trying to execute a long-running (but highly optimized) query on a server in our company. I've run the same query on the same data on my home computer (5400rpm harddisk) and it took about ...
1
vote
1answer
2k views
Bandwidth bottleneck on VMWare ESX Virtual Machine
I have 2 loadbalanced apache virtual servers that handle a couple thousand requests per minute, and I am trying to diagnose the bottleneck that is slowing them down.
My webservers each have one ...
2
votes
4answers
4k views
How to find the bottleneck while transferring huge files between 2 hosts
We frequently need to transfer huge files (upwards of 50 GB) between two hosts, and the transfer rate never seems to reach the expected throughput for the network. There are several points which could ...
0
votes
2answers
110 views
mySQL Database Performing Extremely Poor on INSERT, DESTROY, but fine on FIND and UPDATE
I believe I've encountered a database scaling issue. I have a table with nearly a million rows in it now and our rails application appears to be hanging whenever we try to create a new instance. I ...
1
vote
2answers
667 views
How to tell whats making this server slow
Hello I have an HP server configured for RAID 1+0 using 2 SATA disks. I'm pretty new to handling servers also.
The server has had the same OS(Windows Server 2003) on it for a while so I'm not sure ...
2
votes
1answer
714 views
Disk or Network Bottleneck and Perfmon?
I'm trying to see if we're choking our NAS server with RAID 5 on a PERC RAID card.
I've been playing with Perfmon and have been looking at various ways to try narrowing down the performance counting ...
3
votes
4answers
747 views
Recommended SSD Setup
I'm building a new server which will be running a text search service for our online web services. This service requires fast IO so I am trying to further reduce any potential bottlenecks. I would ...
0
votes
2answers
231 views
How do I know when server “runs at speed limit”?
Basically I'd like to know if it's possible to speed up my server or not by using caching like squid, checking for possible errors in configuration, optimizing various server software parameters, etc.
...
4
votes
6answers
5k views
Find the bottleneck: disk I/O on Windows XP
One of our development boxes has developed a problem wherein performance will occasionally drop through the floor. When this happens, you can hear the hard drive thrashing, but I don't know what's ...
