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

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6
votes
1answer
62 views

What do users see when Apache reaches MaxClients?

Occasionally, in my Apache error log, I will find: [error] server reached MaxClients setting, consider raising the MaxClients setting I've purposely lowered MaxClients in the past (to 60) due to ...
0
votes
1answer
25 views

Does Apache mod_status give any insight to tuning Apache config?

Does the Apache mod_status output give any insight to tuning Apache prefork config? For example, using Apache's mod_status, I figured out that My server gets 3 requests/sec average, the range is ...
1
vote
0answers
17 views

Run application from network drive takes long

This problem started recently, and I wasn't able to find a solution. Not even formatting solved. We have a program on our network drive and the Whole company accesses to this single exe. Usually the ...
0
votes
0answers
12 views

Make rsync move (not copy) files on local file system [migrated]

Can I make rsync to move large amount of files instead of copying them when on local filesystem? I would like it to behave like improved mv command. I know about --remove-source-files option but ...
11
votes
1answer
172 views

NFS poor write performance

I have two machines connected with 10Gbit Ethernet. Let one of them be NFS server and another will be NFs client. Testing network speed over TCP with iperf shows ~9.8 Gbit/s throughput in both ...
0
votes
0answers
12 views

How do vCores work in Virtuozzo Virtualization?

We are evaluating vServers based on Virtuozzo. The marketing says 2 dedicated Cores 6 virtual Cores /proc/cpuinfo lists two cores. The support told us, that the virtual cores will be used when ...
0
votes
0answers
27 views

CPU usage of server extremely low and webpage load time high?

On a weekday at a time where very few use the optimized website on the server, the time for the page to completely load excluding 3rd party advertisements is about 0.6 seconds to 1 second. Now when a ...
2
votes
1answer
9 views

Same hardware/software, significant difference in performance

Introduction I have two sets of machines, set A and set B, with apparently the same hardware/software configuration, but with a significant difference in performance. Machines in set B are up to x4 ...
0
votes
2answers
36 views

How to speed up (very remote) overloaded server connection

I'm living in France and I need to load a page from a far far away server (still in the same galaxy). "Far" is Canada to me, meaning over 8 000km of internet cable. The problem is, this server is ...
0
votes
0answers
40 views

My website takes a long time to START loading

My website takes a long time to start loading. Once it starts there's a 3 second load time which is fine, but it seems to do nothing for 7 seconds first. Can anyone help me to understand what those ...
-1
votes
0answers
5 views

VMWare Workstation split vs monolithic disk [migrated]

After some reading of what's available on the internet it seems that all sources state that monolithic disks are faster, and the only advantage of split disk is portability/compatibility with file ...
1
vote
0answers
8 views

SAS direct dual link connection to an embedded LSI Fusion-MPT controller

This is a hardware question. I have a dual-link SAS hard drive and a Intel S5000XVNSAS motherboard without the drive cage option. Recently, I bought a direct dual-link cable ...
0
votes
0answers
43 views

PerfMon: Processor Queue Length - Random high spikes

I'm investigating alleged high CPU usage on one of our client's servers. After about 1 business day of "normal" activity, PerfMon is reporting the following values for Processor Queue Length, and I'm ...
0
votes
1answer
50 views

RAID1 very slow with LSI card and 2x Samsung EVO 850 drives

not sure if I'm checking it correctly, but here is what I have. Desktop, LSI 9260-8i card, see config below. 2x 500Gb Samsung 850 EVO drives. I also have Samsung 830 drive attached to motherboard ...
0
votes
0answers
41 views

Server high memory and cpu - no leads

I've been asked to troubleshoot a server hosting our application at a client's facility. The client has complained to us on two separate occasions in the last week - week and a half. In one instance ...
0
votes
0answers
12 views

Postgres 9.3 maximal cluster size with streaming replication [duplicate]

First, I quote from https://wiki.postgresql.org/wiki/Binary_Replication_Tutorial: In Streaming Replication, the master and the standby have special processes called the walsender and walreceiver ...
-1
votes
1answer
22 views

Measure traffic of streaming audio/video in whole office

I would like to measure the different traffic used in our office, specifically streaming of audio and video. I'm trying to assess whether there is any affect of people using streaming on our internet ...
-1
votes
1answer
21 views

Synchronize Staging Server and Live Server [closed]

We have staging and live server at our office. Where Live code and DB changes are far more advanced than staging one.This application developed under php and DB is mysql. Earlier we used to work in ...
-4
votes
1answer
36 views

mysql hot add memory

Is it possible for currently running jobs in MySQL to utilize memory that's been hot added? It looks like when memory is hot added to the VM the currently running jobs are not utilizing the additional ...
4
votes
2answers
69 views

How to interpret values of Perfmon counter Hyper-V Hypervisor Virtual processor\CPU Wait time per dispatch

So there is a lot of guidance on the web that advises tracking the values of the Perfmon counter Hyper-V Hypervisor Virtual processor\CPU Wait time per dispatch as the nearest Hyper-V equivalent of ...
3
votes
3answers
305 views

Fastest SSL cipher implementation for Nginx if strength is NOT needed?

I have a use case that is the inverse of most: I'd like to implement very weak SSL ciphers in the name of performance, with the option to fall back to stronger ciphers if the client requests it. ...
0
votes
1answer
51 views

Does PostgreSQL perform on Windows as well as on Linux

This topic was brought up in 2011, and the consensus was that there were design considerations that would give PostgreSQL a leg up on Linux. It is now 2015, has that changed? If there are things that ...
0
votes
0answers
28 views

Troubleshooting high load average

We have a cluster of Centos 6.5 servers that run Java on them. These servers connect to a cluster of MongoDBs quite frequently. On the Java cluster, we are seeing high load averages but CPU ...
0
votes
0answers
61 views

Is it better to store the MySQL database directory on a separate RAID 1 device?

We have a Linux server with a RAID 1 using two HDDs on which runs a Apache server managing multiple sites and some other services that interact intensively with the databases and produce massive ...
0
votes
2answers
144 views

email sending speed - how to improve

I am maintaining a server to send email mailings (no spam, of course). The current speed of this machine is approx. 2000 emails per hour. (edit: actually I did a test mailing today, removing the ...
0
votes
0answers
51 views

Apache and JBoss mod_cluster speed up reload

As an alternative to this question, is it possible to decrease the amount of time that it takes for the Apache (httpd) server to pick up the JBoss servers after the Apache server reloads? As of right ...
6
votes
1answer
64 views

postfix performance with lists in main.cf

For defining a list of items to assign to many different options in postfix, you can either use a comma separated list like this: relay_domains = example.com,example.net,example.org or a hash map ...
0
votes
1answer
33 views

Http proxy server performance analyzing

I have implemented a http proxy client/server. Currently I intended to test performance of this proxy client/server. Can anybody tell me what kind of tests should I take to analyze it's performance? ...
0
votes
0answers
26 views

Loggin request execution time along with requested URL

I'm running a ASP.NET WEBFORMS application on a windows 2012 Server. I need to be able to calculate average execution times for each page in my application. I know the IIS logs have a time-taken ...
0
votes
0answers
42 views

Determine is VPS is slow just through PING?

I'm running a severe issues on this site and I'm trying to see if the problem is at server side (just if VPS is slow or some kind of miss configuration) or software side (Wordpress). I'm not an expert ...
0
votes
0answers
22 views

How to measure file access by process over time?

I would like to take a sampling of data / file access over the course of several hours or days in order to ascertain what processes (with their accompanying files) are consuming the most drive IO in ...
0
votes
0answers
15 views

How to ascertain where to effectively allocate server resources?

I have recently received an upgrade to one of my servers of a 256GB SSD drive (this is in addition to two other primary 1TB drives) and a memory upgrade bringing the server to 64GB from 32GB of RAM. ...
0
votes
0answers
29 views

Taking a thread dump on IBM J9 takes a long time

I'm trying to collect a java core on AIX (java version 1.6). There is only one dump agent configured, which collects a system dump, heap dump and java core on every SIGQUIT, so I used HealthCenter to ...
-1
votes
1answer
45 views

Compiling nginx and php

Im about to set up a basic web server based on ubuntu server 14.04 x64 with an online shop section, the server will also consist mysql, mail, and maybe other servers as well until it runs smoothly. ...
0
votes
0answers
36 views

ATM connection has slow upload speed when connected to switch or router

We just got a new additional ATM line with 10/10 Mbps. When connected directly to a PC NIC, internet speed tests all come up as 10/10 Mbps. However, when connected to any of several routers or ...
0
votes
1answer
49 views

6 GB/s SAS RAID 10 (6 Drive) vs. 3 GB/s SAS RAID 10 (14 Drive)

I am running MS SQL 2014 Standard and have a Dell MD 3000i iSCSI SAN. Rough specs: Dell R610 With PERC H700 controlling 6 x 2.5" 15K SAS drives (6 GB/s) Dell MD3000i with 14 x 3.5" 15K SAS drives ...
0
votes
0answers
51 views

How to interpret atop Disk usage and what disk usage is reasonable

I have a a couple of virtual machines all with the same provider. I'm using them for web hosting and have started to get intermittent slow page load times. I've installed atop to try and get to the ...
0
votes
1answer
40 views

Test cloud VM performance

I have a linux VM hosted in a cloud environment. I suspect the provider to do too much overprovisioning with CPU and IO, from time to time. For example postgresql's reports 300ms+ queries that are ...
1
vote
1answer
80 views

What can explain Hyperthreading bringing a server to its knees

In the last year I've had 2 brand new servers that I commissioned where their performance made them unusable. The both servers were Dell R620 servers with 1 processor. One had 6 cores and the other ...
0
votes
0answers
19 views

Poor memory performance on intel avoton?

I have 12 of these supermicro A1SA2-2750F boards that I'm playing around with in order to compare them to Dell's C5220s but I'm seeing consistent poor memory performance. Just curious if anyone's ...
0
votes
1answer
22 views

Are there benchmarks that measure code execution with various CPUs? Nodejs server building

I have experience building PCs with gaming in mind. But where do I start when it comes to building a server (running specifically NodeJS programs)? I know the most significant factor would be the ...
0
votes
0answers
43 views

Slow sudo response

We have LDAP setup to provide information regarding sudo. The whole system works, but it takes a long time (~10 seconds) for any sudo command to return. For instance if I run strace -f -r -o ...
2
votes
2answers
47 views

Performance tuning world wide?

I am working on a website that is used by people all over the world. Currently we have a web server that is in Oregon and a database sever that is in Chicago. When users from the US access the ...
3
votes
5answers
274 views

Router limits network performance but its CPU load isn't 100%

I'm using a PC Engines APU device running FreeBSD as a NAT router. The setup is very usual: one WAN connection and one LAN connection. Theoretically, WAN connection is 800/40 Mbit/s and the LAN one ...
2
votes
2answers
100 views

Virtualized Server 2003 vs Server 2008 R2 file transfer rate differences?

Basically I am trying to find out where the difference in the rate of a network file copy might come from. I have a virtual Server 2008 R2 SP1 and a virtual Server 2003 R2 SP2, using the same store, ...
0
votes
0answers
87 views

Windows Server 2012R2 benchmark [duplicate]

i hope you can help me. I have got this task to "characterize" and benchmark performance on our new server setup we have at a hosting center. Basically it is 2 HP ProLiant DL380p Gen8, 3.00 GHz, ...
1
vote
0answers
36 views

Performance issues with cross-drive NTFS junctions

I have the following setup: Windows 8.1 32-bit Drive 0: system drive, SSD, NTFS, mounted at C:\ Drive 1: data drive, magnetic HDD, NTFS, mounted at C:\Users\Database User\Documents and Z:\ ...
0
votes
0answers
40 views

How efficient is the tac command on large files

The taccommand (catreversed) can be used to read a file backwards, just like cat reads it rom the beginning. I wonder, how efficient this is. Does it have to read the whole file from the beginning and ...
0
votes
0answers
37 views

MongoDB hogging IO but it doesn't show in mongotop or mongostat

Iotop says mongod is using a lot of IO (96.32%) for a long while but mongotop and mongostat show a bunch of zeros. How can I better monitor mongodb and find out what's happening?
1
vote
2answers
138 views

Slow serving of static files with IIS 8

We're hosting an ASP.Net MVC web app on Windows Server 2012, which runs over HTTPS. Most of the time everything is nice and fast, but we've noticed that about 1 in 50 requests for static files (e.g. ...