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Questions tagged [performance]

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

8
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0answers
1k views

Troubleshooting Redmine (Bitnami Stack) performance

I've got a Redmine instance (Bitnami Stack) that's unusually slow. Because I'm just trying to get to the bottom of this, I have some theories which I'd like to discuss here. So, if anybody has any ...
6
votes
0answers
439 views

SQL Server Management Studio - “Restore from Device” dialog is slow

Whenever I try to restore a database in SQL Server the dialogs take an excessively long time to open. The worst offender seems to be the "Select backup devices" modal sub-dialog from the Restore ...
6
votes
0answers
782 views

Why multicast UDP can be slower than unicast UDP?

I have two machines (with Centos 7.3 on both) connected via 1G switch. When I measure UDP thoughput between macines with iperf it gives about 850 Mbit/s. However when I measure multicast UDP thoughput ...
6
votes
0answers
3k views

Use perfmon to monitor a specific ASP.NET webapp across worker process restarts, IIS restarts, etc.?

I have a few perfmon performance counters that I'd like to track for a specific ASP.NET application over an extended period of time, say a week or a month. The trouble is that perfmon counters are ...
5
votes
0answers
93 views

What could cause a LAMP server to perform poorer than my laptop?

I'm running a WEB application (PHP + MariaDB) for my company, developing on my laptop and running the production version on a dedicated server. Recently, I've started to measure performance and ...
5
votes
0answers
426 views

Disable NIC Receive Side Scaling hashing

On a benchmark lab system running Fedora Core 27 I've got Intel X710 10GE cards and 12-core Xeon processors, configured with 12 NIC queues and RX Flow Hashing based on both IP addresses and port ...
5
votes
0answers
1k views

HP MSA P2000 G3 Disk Scrubbing performance?

I have a HP P2000 G3 array with two 10Gbit iSCSI controllers in it that presents storage to my virtualisation cluster. It is soon to be expanded with two D2700 shelves each loaded with 25 10k RPM ...
4
votes
0answers
2k views

Better performance when HDD write cache is disabled? (HGST Ultrastar 7K6000 and Media Cache behavior)

Attention, please. Long read. During initial performance tests of Hitachi Ultrastar 7K6000 drives that I'm planning to use in my Ceph setup I've noticed a strange thing: write performance is better ...
4
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0answers
838 views

Disk performance very slow on esxi 6

I have dedicated server with esxi6. I uploaded many iso from vsphere window client and i have 5 vms on it with 2 X1 TB HD SATA. The upload was quick but just now it is taking forever to upload. ...
4
votes
0answers
658 views

Occasional excruciatingly slow resources transfer with Tomcat on AWS EC2

I have a running Tomcat v9 instance in a Docker container on an AWS EC2 host. It works perfectly, most of the time, and will once in a while deliver resources very slowly. What exactly is served ...
4
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0answers
294 views

Prevent Gunicorn from loading slowly after an inactive period?

My Django project is running on gunicorn. Sometimes loading a page (and oracle procedures calls related) takes a lot of time. This occurs 90/100 when the server remains inactive for some minutes. How ...
4
votes
0answers
2k views

Tuning mdadm RAID 5 performance?

I have a system with dual Intel E5-2620 v3 @ 2.40GHz, 64 GB ram, an LSI 3008 HBA, 8x 1.6 TB Intel S3510 SSDs. I've been playing benchmarking it in different configurations using fio and I've gotten ...
4
votes
0answers
159 views

NGINX Worker Process, Burst Read Speed to only 1918kb/s

I am running an NGINX/1.8 server on Centos6.6 with multiple worker_processes, however while observing iotop I notice they burst up to 1918kb/s Read speed and rarely if at all pass that limit. I want ...
4
votes
0answers
2k 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 ...
4
votes
0answers
98 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 ...
4
votes
0answers
17k views

MySQL Workbench InnoDB Buffer Usage at 100%, always

The InnoDB Buffer Usage graph is always at 100%. I believe this started to happen when I changed MySQL's temp folder to a much bigger drive, does that make sense? I suppose the thing to do in this ...
4
votes
0answers
2k views

How can I improve performance over SMB/CIFS for an application that has poor write speeds?

I have a third party application that reads several large files and generates a third large file. Its performance is quite good when the generated file is stored on "local storage", i.e. either a ...
3
votes
0answers
369 views

GeoIP vs IPset performance in iptables

I would like to ask you what is faster in term of performance GeoIP or IPset. Let me explain, imagine that I have rule: iptables -A INPUT -m geoip ! --src-cc US,UK,CA -j DROP And imagine that I ...
3
votes
0answers
50 views

Do I need to create multiple filesystems on a virtual server to increase I/O performance?

I want to install Oracle on a virtual server. I don't really know the technology behind, my company just gave me a virtual server with multiple (virtual) disks. I have the possibility to divide those ...
3
votes
0answers
592 views

ZFS slow read speed on 8 drive 4 vdev striped mirrors

I have 8 3TB WD Red SATA drives sdb through sdi i use in my pool. My boot and OS drive is a an 850 EVO SSD on sda. The 8 WD drives are on a Supermicro AOC-SAS2LP-MV8 Add-on Card, 8-Channel SAS/SATA ...
3
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0answers
148 views

Finding or estimating sequential vs random distribution of existing system (VMware / SAN)

IOMeter testing says the IOPs of the storage subsystem can range from hundreds of IOPs for 100% random loads to tens of thousands IOPs for 100% sequential loads. Is there any way I can measure or ...
3
votes
0answers
1k views

Azure ASP.NET website http requests queued

We have a website deployed on Azure that has dreadful performance. When load increases, response times increase to whole minutes! CPU load is not even high, somewhere in the 40% region (we run one ...
3
votes
0answers
935 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 ...
3
votes
0answers
2k views

Amazon RDS: Sudden increase in Read IOPS and Throughput

I am using Amazon RDS to host the databases for my website. I am using the large instances for both my master and my read replica. Everything was running smoothly until suddenly the Read IOPS, Read ...
3
votes
0answers
3k views

How to reduce or shrink the MFT (Master File Table)?

I have a dedicated windows server 2003 with more than 3 millions of files, recently I created a new partition to separate the website files from the OS. Later I reduced the site of the OS with some ...
2
votes
0answers
547 views

vmware esxi 6.0 slow disk perfomance

Hardware: Intel SB2600WTTR, 2x Xeon E5-2670v3, 96Gb RAM, 12x Seagate 900Gb 10K in RAID5 (LSI MegaRAID SAS Invader Controller). Software: VMWare vSphere ESXi 6.0.0-20150902001-standard. VM: Debian ...
2
votes
0answers
577 views

How to reduce the IO Wait Time during a rsync backup?

I have the following situation: There is a set of machines in the network (NAS and other "servers"). There is one additional machine for backup purposes. It collects the data from all 4 machines on a ...
2
votes
0answers
839 views

Buffering when serving videos through AWS CloudFront

We are hosting videos in AWS S3 in HLS format (lots of .ts files, + playlists .m3u8). We have configured AWS CloudFront with all Edge locations to serve those files. We have 2 apps, iOS and Android, ...
2
votes
0answers
66 views

find out NUMA locality of process RAM

I am doing an application benchmark with multiple instances of the same application. I found out that pinning their processes (with sched_setaffinity under Linux, with TaskManager under Windows) to ...
2
votes
0answers
102 views

Performance issue with fresh install MySQL 5.616-1~exp1 (Ubuntu) on Ubuntu 16.04 LTS

I've recently started on a new company and I'm currently setting my dev environment. We're using Ubuntu 16.04 and MySQL 5.6 Everything was right until I launched the tests (using mvn test). After ...
2
votes
0answers
147 views

How come website be random slow? Open sleep processes?

My website is randomly very slow by high MYSQL CPU, and I have no idea what the problem is. Hopefully I will come closer to the solution with this post. If I check the mysql processes, I see a lot of ...
2
votes
0answers
4k views

Windows Servers Very Slow, Low CPU Usage Low Memory Usage

Apologies in advanced for the obscure question... We have several servers in our infrastructure that have been behaving strangely lately. For example, a machine will become totally unresponsive, we ...
2
votes
0answers
832 views

Determining Rails max threads and database pool size using Puma and NGINX

I noticed the default pool size for a Rails 5 App using Puma is equal to: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %> Which means that you can establish a max number of threads as an ...
2
votes
0answers
226 views

How expensive is rsync if nothing has changed?

How "expensive" is an rsync on the various computing resources (CPU, RAM, network, etc.) if nothing has changed on the source file system? I've two weak servers across a very high latency network and ...
2
votes
0answers
1k views

Why is nginx slower than apache for reverse proxy

Everywhere i read that nginx is much faster than apache and specially as a reverse proxy. For me its quite opposite, and i cannot determine why. Am i doing it wrong? For a simple request, with apache ...
2
votes
0answers
395 views

What can be the cause of high number of nfs_lookup requests?

Since a recent linux kernel upgrade (3.2.78 on Debian Wheezy) on both my NFS clients and NFS server, I'm seeing really high increase (10 to 20 folds) in the number of nfs_lookup requests from the ...
2
votes
0answers
105 views

Data throughput/latency and poe performance in TPLINK TL-SG2424P 24 ports POE Managed Switch

I recently bought a TPLINK TL-SG2424P 24 ports POE Managed Switch. At the moment I'm going to use it with only a handful of access points, no more than 4 or 5, at least until the end of the year ...
2
votes
0answers
436 views

Calculation of Xeon server memory bandwidth

I am looking at a dual socket server based on the Intel(R) Xeon(R) CPU E5-2640 v3 @ 2.60GHz The configuration looks like this. 4 memory channels per socket DIMMs are 8x32 GB DDR4 2133/1866 modules ...
2
votes
0answers
28 views

Forking loads disk

I have a prefork/fork daemon. By atop I see, that master-process often consumes disk: PID TID RDDSK WRDSK WCANCL DSK CMD 16830 - 7264K 48696K 18624K 10% our daemon From strace I see, that it ...
2
votes
0answers
111 views

rsync: Maximum nice to keep system responsive

Unfortunately a background rsync reduces the responsiveness of a server. I search a way to have maximum niceness for this background task, to keep the server respond fast. My current wrapper ...
2
votes
0answers
109 views

Unexpected discrepancy between write and read performance using cryptsetup 1.4.3 and 1.6.6 on Debian Wheezy (7.9) and Debian Jessie (8.2)

I have been setting up a raid1 array and have set up an encrypted medium using cryptsetup with default options. The raid arrays are supposed to use 2 drives, but for the moment, I only have 1 drive in ...
2
votes
0answers
1k views

Spring Boot 1.2.7, Tomcat, CSS and Thymeleaf = Very Very slow service

I have a Spring Boot 1.2.7.RELEASE web application (with Tomcat embedded) which needs to handle a very high load spike, ~ 10k connections in 4 to 5 minutes on one server (there is actually a cluster ...
2
votes
0answers
739 views

Performance counter to show real IIS response time

What performance counter should I use to display current average IIS response time? ASP.NET counters correctly show the time spent in ASP.NET, but real latency is much bigger, which is confirmed by ...
2
votes
0answers
2k views

GlusterFS Split Brain issue

I have been facing issues in performance with GlusterFS setup. We took a new build of application live and suddenly all GlusterFS clients and masters also started showing high utilization of CPU. This ...
2
votes
0answers
800 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:\ ...
2
votes
0answers
673 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 ...
2
votes
0answers
3k 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: ...
2
votes
0answers
174 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 ...
2
votes
0answers
2k 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 ...
2
votes
0answers
783 views

actual disk iops and write merging

/dev/sdb has LVM and exposes a single logical volume, dm-0. While writing to dm-0, /proc/diskstats reports: # of writes completed sdb 29646717 dm-0 131315099 # of writes merged: sdb 101668283 dm-0 ...