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

learn more… | top users | synonyms (2)

-1
votes
0answers
6 views

How many simple proxy request / second can a current-generation HP DL360 handle?

Does anyone have any figures (or pointers to calculators) to say how many requests / second I should expect to be able to handle with Apache on a current-generation DL360? The requests are HTTP GET ...
-1
votes
0answers
36 views

One PHP script that brings whole server down

We have a WordPress site hosted on Amazon, running Ubuntu and Apache. Occasionally the site becomes very slow and unresponsive. According to newrelic, the server is busy with this PHP script: ...
1
vote
1answer
5 views

slow file server with contradictory values for CPU and CPL in atop

I've got a fileserver (centos 6.3) that slowed down suddenly earlier today. The cluster that mounts it could access other NFS mounts without a problem, but the access to this one was VERY slow. ...
1
vote
0answers
50 views

NGINX using 100% of the server CPU when testing with Blitz.io

I'm facing an issue here and after four days of looking around I decided to ask for some help here, after all a million heads can think a lot better than one. I have a Ubuntu 14.04 server setup with ...
1
vote
1answer
25 views

Strange Disk Benchmarking results for our storage, how to explain? [on hold]

I recently tested the storage we got from our hosting provider. I don't know what raid config or how many disks the storage contains of. I used Atto Disk Benchmark which sends smaller and bigger ...
1
vote
0answers
24 views

Improve read performance on ext4 on Centos with software raid1? [duplicate]

I'm running a number of MongoDB nodes on dedicated servers running Centos6. Each machine has two SSDs which I have in Raid1 with two logical partitions: # df -h Filesystem Size Used Avail Use% ...
-5
votes
0answers
50 views

Slow site, most time spent Blocking/Connecting [closed]

My site is based on user-submitted content, meaning that users can upload images, etc. The problem is, my website loads extremely slowly on first load (before it caches). For example, here is the ...
1
vote
2answers
29 views

What is the difference between truss -D and truss -E?

I am currently analyzing a command on Solaris that reads from a file and has very low performance. The truss -D commands shows me read system calls taking up to 0.03 seconds, but when I use truss -E, ...
0
votes
0answers
26 views

Good Internet connection, but websites load slowly or not at all and internal web server presents same issue to outside users

Lately, users in my organization have been having problem accessing web pages. The browser status bar will say "Waiting for [site]" or "Downloading...", but pages never load, or only load partially ...
1
vote
1answer
31 views

Ubuntu Server 14.04LTS Swappiness for server with 16GB memory

(don't worry I'm not asking what my setting should be, asking for the theory behind some conflicting advice I've read) My application is one that is lightweight and not under much load, but needs to ...
-2
votes
2answers
65 views

fastest way to transfer small files (faster than scp) [closed]

Scp is quite slow for transferring individual files. What is the quickest way to do this? The reason I need speed is not because I have a large number of files to transfer. I just want the individual ...
0
votes
1answer
26 views

What is the counter type for Linux's /sys/block/$DEVICE/stat

What are the counter types for /sys/block/$DEVICE/stat? $ cat /sys/block/sda/stat 8323741 42381356 464031898 19207478 1940738 49062039 408122282 79935459 0 22315734 99172579 Specifically, ...
1
vote
1answer
49 views

Website performance sluggish - High CPU and Disk Usage

Over the past couple of days my website's performance has been very sluggish, with queries taking a lot of time to execute. My CPU usage hit around 100% 4 times this week. Here is the output of top at ...
1
vote
0answers
61 views

Is it normal for uploads on ADSL to make the connection unusable (> 4000ms latency)? [migrated]

I have an ongoing saga with my internet connection; where the latency periodically goes through the roof. In most cases, this seems to coincide with something uploading data. I'm not having a lot of ...
0
votes
1answer
27 views

PostgreSQL queries slower than before?

I am using PostgreSQL 9.3 server on my production server. Everything had been working fine for the past couple of months. But since the past week or so, PostgreSQL seems to have becomes very slow with ...
0
votes
1answer
50 views

Measure Dedicated Server Performance

I run an online video streaming site and keep getting more and more dedicated servers. Our business traffic fluctuates on an annual cycle which allows us to scale back our dedicated servers during the ...
0
votes
0answers
33 views

What happens on an SQL Server when a snapshot is taken by VMWare?

Recently I saw in our SQL Server logs that a snapshot could not be taken at the specific time and he retried it later on. During that timespan we had a huge performance problem. Besides the SQL Server ...
0
votes
1answer
79 views

How to solve performance problems with VMware ESXi 5.5 on old Dell PowerEdge 2900 hardware [closed]

I have a couple of old Dell PowerEdge 2900 servers that have come free and I would like to use them to host a mail server cluster. They are a bit old, but have been running workhorses for a while, ...
0
votes
0answers
26 views

Capacity planning of messenger server [duplicate]

This is regarding a messenger server being developed. This will have thousands of users connected and will be able exchange messages. Users will also be able to send messages intended for multiple ...
0
votes
0answers
90 views

Troubleshooting poor Windows Server performance

I have two Windows Servers. One is used as the Gated Check-In build server and the other is planned to replace it. However, the second server demonstrates poor performance despite having superior ...
2
votes
0answers
79 views

Cannot set 1G speed on 10G nic using ethtool

I have a linux server with 10G fibre nics: xyz@xyz48:~$ sudo ethtool p1p1 Settings for p1p1: Supported ports: [ FIBRE ] Supported link modes: 10000baseT/Full Supported pause frame use: ...
0
votes
1answer
50 views

Is it safe and efficient to install HHVM on top Apache server with nginx as reversed proxy?

I've been trying to optimize my VPS for WordPress performance, and today, I decided to take it to a new level: I'm thinking about installing HHVM. Server status: My server runs Apache, and I have ...
0
votes
0answers
18 views

Tuning and configuring Django Application with Apache & Mod Wsgi

We are running Django Application using Apache+mod-wsgi. application is taking too long to load. even a single list view page load takes 6-15 seconds. Can you suggest improvements? Provided are my ...
4
votes
1answer
56 views

Multiple websites on multiple servers - seperate mysql or not

I currently have 2 Debain boxes (VPS - 4Gb memory) and am hosting a variety of websites of different importance, some ore production sites, others are demo/staging/test sites. Approximately 15-20 ...
0
votes
0answers
9 views

Ubuntu Server 14.04 in VirtualBox: disk performance drops with more than 1 CPU [migrated]

I'm running VirtualBox 4.3.18 on OSX 10.9.5 . I install Ubuntu Server 14.04 64bit and performed this basic disk write test: dd if=/dev/zero of=bigfile bs=1024 count=5000000 The result with 14.04 / ...
6
votes
2answers
114 views

Calling sync/fsync slows IO after 30 minutes uptime

After 30 minutes of uptime using Ubuntu 14.04 with an ext4 hybrid SSD I see many processes blocking IO using iotop. The root cause of this slowdown has been traced back to the Unix system call sync. ...
0
votes
0answers
38 views

nginx load balance not increasing request per minute

I have a flask app deployed on a gunicorn server and another server with nginx as reverse proxy. The issue is when I add one or more servers running gunicorn and use nginx to load balance, the ...
0
votes
0answers
62 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 ...
2
votes
2answers
79 views

Linux virtual memory tuning to workaround disk I/O issue

I am having a problem with a Linux server that it is writing to much to disk, thus I am having a slow response time due to a big IO wait. I already check smart values for the disks and are OK. This is ...
0
votes
2answers
39 views

Squid proxy performing extremely slow and sometimes doesn't work at all

I recently installed Squid on my desktop machine for testing purposes. I didn't edit the config whatsoever, and just pointed firefox at the proxy to see if it was working. Pages take an insanely long ...
-2
votes
1answer
37 views

Amazon G2 not giving a much better computing performance than my laptop CPU [closed]

I have a Java console application that performs Reed-Solomon error correction on large volumes of data (~700 MB at a time), just to test performance. The application is multithreaded, I can see it ...
0
votes
1answer
35 views

Negative effects of setting nginx workers too high

I've seen numerous posts advising how to set nginx's worker_processes, but very few detailing what happens when this is set too high. I'm about to run some benchmarks, but I'd appreciate advice on ...
-2
votes
1answer
34 views

How to check my site speed? [closed]

im the developer and in charge of a company's Wordpress based site our site started to run a lot slower recently and i am trying to figure it out for two weeks now! My main problem is that every ...
3
votes
0answers
59 views

Odd performance fluctation with php-fpm and nginx

I'm running a load test against a web service. It's a php application running on php-fpm and nginx, with fastcgi. There is a MySQL backend being used for small reads only. Invariably, I'm seeing a ...
-5
votes
1answer
54 views

Distance between DHCP server and remote pc effect performance? [closed]

Hey guys im doing a project where i have to create a WAN network however i was curious whether the distance of the DHCP server will bring down the performance loads if it was held from a different ...
1
vote
1answer
113 views

IPSec Site-to-site VPN speed between Germany and China very poor

we have successfully setup a Site-to-site IPSec VPN connection between our two offices in Germany and China. Below are the characteristics of both sites, VPN and current speeds: Germany VPN Router ...
0
votes
0answers
45 views

Why does chrome show a very long 'blocking' time (sometimes) when loading static files from Jetty 9

I'm seeing some strange behavior from Chrome when loading web resources from a Jetty 9.2.3 instance I'm setting up. In particular, I see some requests returning quickly, while others take a very long ...
0
votes
0answers
59 views

Azure disk performance

I am running on-demand, research D14 instance in Azure South Central US region, with a 4-disk RAID0. Recently the disk performance has become unusably slow, particularly the RAID performance, which is ...
1
vote
1answer
26 views

API and main page as two separated processes

SITUATION I created an REST API for my mobile application and now I want to create a website. API so far is very very simple, just for a couple requests like 'get list of contents', 'update some ...
2
votes
1answer
42 views

VMware VMFS5 Local Storage LUN Sizing

We have a VM ESXi 5.x host using local storage (DAS). It has 2 relatively large Logical Drives in RAID10 (10 HDD x1TB each). So, 2 LUNs of 5TB each. We are considering creating just two ...
3
votes
0answers
44 views

Windows Server 2003 terminal server extreme logon times

For the past week my users have been experiencing extreme logon times. They are generally in the 20 minute range or more. I will lay out my research below to see if anyone may know how to find the ...
0
votes
1answer
106 views

Performance issue HYPER-V : VM shows very high CPU use, but the Physical machine shows very small CPU use

My Hyper-V VM(Server2008R2, SP1) shows very high (almost 100%) CPU use when fully under heavy load (6cores from total physical 8cores, 25Gb RAM from total 32GB) - used as TS, Picture TOP right corner ...
0
votes
0answers
94 views

MongoDB high CPU usage

Running MongoDB 2.4.11 on Ubuntu 14.04.1 LTS In top, this mongod thread is constantly using ~195% CPU: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 24524 mongodb 20 ...
0
votes
1answer
55 views

Website slowing down when many users access simultaneously [closed]

I'm new to web development. I have hosted my website through a free web hosting service providing free subdomain. The free hosting service says that they provide 100 GB bandwidth. I just upload files ...
0
votes
2answers
95 views

Are there any performace gains to using Varnish along php-fpm and nginx? [closed]

PHP-FPM 5.6 and Nginx 1.6.2 would no doubt give maximum performance, at-least speed wise. So, I would like to know if there are any pros/cons to adding varnish cache to gain probably few more speed. I ...
1
vote
0answers
70 views

Appropriate fan speed for a Dell PowerEdge T710

We have a DELL PowerEdge T710 in our office and it is really really noisy, the fans sound like vacuum cleaners! The discussion is whether the server is malconfigured and can be made more silent or if ...
1
vote
3answers
64 views

distributing tables over multiple harddrives

Is there a performance improvement when I distribute database tables over different harddrives? I need to access many different schemas at the same time and I was wondering if adding more harddrives ...
1
vote
0answers
46 views

Why is my server using swap even though there is lots of RAM available? [duplicate]

My server has 24 cores, 16 GB RAM, and 8 SSDs on raid 0 (I think). I've noticed it is now using a low of swap space, even though there is plenty of RAM available. load average: 2.70, 2.54, 2.50 Mem: ...
-1
votes
1answer
55 views

Long Apache Wait times

Thanks for reading my question. I've been having a strange problem with Apache 2.4 on my dedicated Windows Server 2008 machine (8 gigs of RAM, Intel Xeon E3-1220 3.1GHz, 1 gig link). For some reason ...
0
votes
0answers
53 views

Dual core CPUs stall with Docker on Ubuntu Linux

I have seen performance degradation after half an hour to one hour with machines running Celery (Django/Python), or Storm under Docker containers with Ubuntu base on Dual-core CPUs on AWS. I see ...