Tagged Questions

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

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0
votes
1answer
11 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
25 views

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

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 ...
-1
votes
0answers
28 views

Network speed vs hardrive speed [on hold]

I was performing speed tests on my upgraded network, and i'm not getting all the speed i thought i could get across network shares. The tests i did between machines A and B (both running OSX Yosemite, ...
0
votes
1answer
23 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
30 views

How to check my site speed? [on hold]

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
35 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 ...
-1
votes
1answer
24 views

Check latency and download speed of multiple servers [on hold]

Is there a tool where i can add many IP addresses or hostnames and get ping, latency details etc to compare which one will be near to my location. I need to compare this to choose a data center near ...
-2
votes
0answers
25 views

Windows 7/8 clients in a Domain - Performance overhead? [on hold]

Four clients (Windows 7/8/8.1) are living alongside of a Windows 2003R2 server, currently not part of the domain. Mostly the server is used for: file sharing print server backups SQL Server ...
-5
votes
1answer
48 views

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

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
60 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
11 views
+50

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
26 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
20 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 ...
-3
votes
0answers
56 views

How many users on a Mac Mini Server? [closed]

Apple's recent changes to the Mac Mini line have thrown a wrench in a project plan I've been working. In particular, Apple is now only offering dual-core Mac Mini computers. The project plan ...
1
vote
1answer
28 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
37 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
45 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 ...
-1
votes
0answers
24 views

is a VM of 512MB enough to host a PostgreSQL server? [duplicate]

Is a VM of 512MB enough to host a PostgreSQL server? I know it depends on what I will do with it but I am having a hard time to see what a PostgreSQL Server could do on a 512MB machine before it ...
0
votes
0answers
28 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
48 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
79 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
46 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
62 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: ...
0
votes
0answers
38 views

Linux: getting detailed stats for a single HTTP request? [migrated]

I'm writing a script to determine the performance of a service from a client's point of view. To that effect, I need to be able to determine a few stats for each HTTP request like: DNS lookup time ...
-1
votes
1answer
43 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
31 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 ...
2
votes
1answer
87 views

iostat - dm-0 device shows much higher latencies than sdX

We are running linux (Centos 5.x) VM's on top of vmware vsphere 5.5. I am monitoring disk latency using iostat, specifically the await column, but I am noticing strange results with the device ...
1
vote
3answers
78 views

Increasing nginx performance past 1k req/s

I am trying to scale an nginx installation to the best of it's ability. I am running one nginx instance with 6 worker_processes (6 cores) and 5 backend servers consisting af a uwsgi setup with 10 ...
0
votes
0answers
47 views

RAID0 : best chunk size for fileserver with average 650KB files

I found out that my server(linux Ubuntu Server 14.04) has probably a to high chunk size for the RAID0, or atleast I think this is an performance issue... The current chunk size is 512K with 4 disk of ...
-3
votes
1answer
48 views

Nginx can't serve more than 40 concurrent users

I'm testing my Nginx web server (configured with CentminMod) with https://www.blitz.io/ and the server returns timeouts when the connected users are about 40. I can't understand why! It's Nginx, not ...
1
vote
0answers
83 views

Server RAID0: one hdd is more %busy then the others?

I'm testing 3 servers with RAID0 with 4 disks. During my test I noticed on all 3 servers that one of the hdd's is more %busy and has much higher averige IO wait (almost 4x higher then the other ...
1
vote
1answer
61 views

Cisco 2901 - IPSec VPN Maxing CPU

We have a Cisco 2901 on the edge of a 100Mbps/100Mbps WAN link which is providing an endpoint for an IPSec VPN to a Juniper SSG 550M. The problem is that we are seeing a max of 'only' 40Mbps over the ...
1
vote
0answers
35 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 ...
0
votes
1answer
140 views

Slow disk performance on Azure Virtual Machine

Okay, so first of all, allow me to say that I'm not an operations person, but a developer. So I'm going into a bit of unknown land here, so please bear with me. I would like to use a Azure Virtual ...
0
votes
1answer
83 views

Slow Upload Speed - CentOS 6

I've been having an issue with my servers upload speed slowing down for the last week. When it first occurred restarting the network service would resolve the slow speeds. The speed would then be okay ...
0
votes
2answers
33 views

SQL Server 2012 which user is using Memory and CPU

For sql server 2012 I am looking for a way to see which active user logins are using how much memory and cpu. I have done a search but it seems there is only a way to see aggregates or how much each ...
0
votes
0answers
17 views

IIS Performance Counters recorded extremely large requests per second value

While I've been monitoring a production IIS server receiving around 1000 - 5000 requests per second almost steadily, I've encountered a few spikes in the performance counter "Requests/sec" and "GET ...
0
votes
0answers
42 views

Slow ext4 read performance on 24-drive hardware RAID6

I have a RAID6 configuration spanned over 24 drives (12x directly attached to the RAID card, 12x via external SAS) running on an ARECA ARC-1880IX-12 (fw V1.51 2012-07-04). The RAID makes up one single ...
0
votes
0answers
33 views

Commands taking very long time to execute on ssh

Strangely on few on my linux servers, intermittently, when i try to login through ssh and run commands, they take about 15-30 secs to execute every command. Every commands is executed very slow. But ...
0
votes
0answers
18 views

Dynamics CRM 2013 on premise workflow performance

We are speaking of the time it takes for the workflow state machine to notice that task A is complete, thus satisfying a wait condition in a workflow definition, which then creates task B. User1 ...
0
votes
1answer
64 views

Strange CPU spikes with MySQL

On my server (ubuntu 12.04) mysqld started to show some strange CPU spikes. I've logged some of it as a sample: http://pastebin.com/4MwKUVwL The value after the triple dash '---' is the cpu usage ...
0
votes
1answer
45 views

RAID6 generates quite a IO wait at relatively low TPS

I have a RAID6 array made of 9 SATA3 disks @7200 RPM, 4TB in size. I have them partitioned with Gparted Live as GPT partitions, starting at the first megabyte. I am concerned about the read speed. ...
0
votes
1answer
59 views

Sql Server 2012 Disk I/O Too high

I am running SQL Server 2012 on windows azure VM Windows server 2012. This is a live Database, about 250GB, with high usage. I applied some best practice articles for the temp-db long ago, and also ...
1
vote
0answers
63 views

Random server load spikes, number of tasks doubles, CPU/Memory consistent

We run a vBulletin forum with 6,000 visitors per day on an SSD VPS with 5GB RAM and 24 CPU Cores. On a typical day we see 30-50 concurrent users at any given moment. On busy mornings, it'll go up to ...
2
votes
0answers
46 views

“Nosy Neighbor” and the CFQ scheduler

I'm trying to understand how does using CFQ affects the "Nosy Neighbor" problem. I'll ask it a bit naively, can a "Nosy Neighbor" even exist when using CFQ? Isn't that CFQ should make sure all ...
8
votes
1answer
494 views

How do I run my PowerShell scripts in parallel without using Jobs?

If I have a script that I need to run against multiple computers, or with multiple different arguments, how can I execute it in parallel, without having to incur the overhead of spawning a new PSJob ...
1
vote
0answers
41 views

Using Azure for application performance testing

I have some custom system management scripts/applications that I would like to performance test against a large number of systems (10,000+) in an effort to simulate larger-scale enterprise networks. ...
1
vote
1answer
40 views

DFS slowly and using a lot write speed on sender member

I am transferring 400gb of multiple files trough 2 server whit 10gb connection inside one VLAN. When I had 2 servers that were not in production the transfer was very quick using 100% of 1gb ...
0
votes
0answers
34 views

Azure Variable Table v Temp Table

This is a bit long; but I have been working through queries figuring out where a performance issue is coming from. Appreciate you taking the time to read it. I have an application running on a ...