Questions tagged [performance]
Questions about server hardware and software performance, or network performance.
3,202
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Random CPU + MEMORY spikes issue on Ubuntu server + Docker + PostgreSQL
I've been encountering an issue that has been bothering me for a while now.
I have a Google Cloud VM running an Ubuntu 18.04 server with several containers, including a PostgreSQL server, a Redis ...
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1
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28
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Could a faulty switch cause upload speeds for some to be slow?
We have recently switched our MSP which has caused a lot of problems with our network, but most of that is fixed and we've got one issue remaining: Half the people in our office have poor upload ...
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35
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Why does downloading the same file twice double the download speed?
I am testing a small home setup consisting of a Windows 10 system with a Firefox fork and a headless Android 9 device, the latter of which provides a wireless mobile hotspot with an unlimited data ...
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63
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pmie_daily and pmlogger_daily services both failing to start on rhel server
I've searched and searched, and can't find much on this problem. Both the pmie_daily and pmlogger_daily services are failing to start on out RHEL server. They are part of the RHEL "Performance Co-...
6
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2
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338
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+50
Ansible performance issues on a huge group
So, I have this host group, which consist of 35k VMs.
Aaaand I need to run a playbook over it.
If it does matter - playbook is just a call for community role for installing node_exporter.
But I'm ...
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1
answer
82
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iperf3 download and upload test simultaniously giving abnormal results
I have a server (Lenovo using Ubuntu) and 2 clients (both Mac). The server is connected with a Wi-Fi router over Eth interface. The two clients are connected with Wi-Fi router over WLAN interface. All ...
2
votes
1
answer
58
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Postfix: high delay in queue manager
Although this question has been asked before, there was no accepted answer (and the quality of answers was not good).
For one site where I send emails to, the "in queue manager" delay metric ...
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2
answers
75
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Debian 12 higher disk activity than CentOS 7
We are in process of replacing our CentOS 7 boxes to run using Debian 12 and have noticed that the overall disk activity on the same server with the same processes running is significantly higher with ...
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23
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To host a medium to high traffic website would I be better off purchasing 1x32-64 core XEON/EPYIC Server or 20x older i5/i7 desktop quadcore machines?
I'm looking to host a website that could get anywhere between 200-20,000 active users.
I'm wondering if I should buy a modern dedicated server with dual socket and a lot of cores (32-120) to run ...
1
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0
answers
16
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How to find the underlying device for a file on top of ext4 on top of LVM on top of multiple underlying storage devices?
I have a system with 3 SSD devices (/dev/sda, /dev/sdb, /dev/sdc) which contain a single LVM logical volume that span over all the devices. I have a single ext4 partition on the logical volume.
I ...
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1
answer
217
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Very slow performance with Nginx and Traefik
We have the following infrasctuture to deploy a PHP application:
A VM running Nginx as a proxy
3 nodes in a Docker Swarm cluster
Traefik containers deployed in this cluster (so we have 3 containers ...
9
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2
answers
1k
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AWS Graviton Processors: which encryption specs are hardware accelerated?
In testing Graviton instances there seems to be significantly more CPU overhead from AES/SHA functions compared to the same on cheaper/smaller Intel/AMD instances. Do these procs supports hardware ...
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57
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Disabling unnecessary Apache modules for simplicity and performance
I noticed that my simple LAMP application does not need most of the default modules the official Docker PHP-Apache image bundles by default:
a2dismod -f access_compat auth_basic authn_core authn_file ...
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1
answer
121
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Diagnosing ASP.NET Core SQL Azure sporadic performance
I have an ASP.NET Core 6 application using EF Core and SQL Azure 'Business Critical' pricing tier with 2 VCPUs. 90% of the time the application is lightning fast, but occasionally throughout the day, ...
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31
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IIS curretly processed requests counter
I am experiencing issue with my application and suspect it might be because I am testing on client Windows/IIS which has 10 concurrent request limit. Is there a way to monitor the current value of ...
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1
answer
97
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Understanding CPU steal time in cloud
I am trying to understand about CPU steal time. This article is the top result:
https://scoutapm.com/blog/understanding-cpu-steal-time-when-should-you-be-worried
To be honest, I do not understand the ...
6
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1
answer
879
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Can I connect two Ethernet ports on the same adapter on the same host to test to check port performance and perform stress test?
I have one Ethernet card with two 10G ports. I cannot verify the port performance and do a stress test by card to card with different systems. I would like to verify the port performance and stress ...
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25
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ETL log collected using Windows Performance Recorder shows blank stack frames
I have collected a ETL log for a CPU spike using WPR but the hot path is ending with blank stack frames. Can anyone please explain what happened ?
Screenshot of Windows performance analyzer showing ...
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1
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83
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MSSQL database slow when move database on other disk
MSSQL Developer Edition, with many database online for test purposes.
To better handle disk space, I moved some databases to another disk. Moved databases perform slower than the original location (...
0
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1
answer
83
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How to find optimum configuration in php.ini on openlitespeed?
I want to increase performance on pagespeed insights, but the problem is I don't know how to use all capacity of hardware on this server ! and I need your help please.
I think litespeed not using all ...
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1
answer
77
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Slow MySQL inserts on one specific machine - what might be wrong with it?
My application runs in docker, so I can be sure it's always the same version of MySQL, same DB structure, same collations and so on. I run it on several machines. On all of them my benchmark script ...
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1
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156
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poor docker / nginx throughput when running with bridge network on ubuntu
My nginx configuration seems to offer extremely poor performance through a docker network, while the host machine (a dedicated server) has great specs (104 threads, 245gb DDR4, SSD).
When benchmarking ...
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141
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Ceph mounted rbd poor performance
all tests are done from an external server connected with 10G to all 3 ceph nodes and the cluster is all nvme flash.
when i ran fio with this config:
[global]
ioengine=rbd
clientname=admin
pool=...
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2
answers
587
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Server's Disk Queue Length is high, but Disk Bytes/sec is lower than it's capable of
I have an environment running SQL Server on a Windows VMWare platform using a SAN with SSDs set up in RAID 6, and using Veeam for server backups and LiteSpeed for SQL Server backups.
I've had a ...
1
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0
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184
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Linux Server is slow on running some commands
I have a Linux server and ubuntu 20.04 is installed on it. Kernel version is 5.4.0-163-generic. 24 cores and 32GB RAM.
I have database running on this server which is working without any issue. ...
0
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1
answer
30
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Pin point performance issue in the past
I experienced a decrease of performance on my server and I was wondering if there is a possibility to lookback in time on a rhel8 machine. Where I can pinpoint which process claimed a lot of resources ...
0
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1
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48
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command took very much longer to run from script than in CLI
In an AWS EC2 serverm, OS: amzn2-ami-kernel-5.10 x86_64
Trying to diagnose an issue of a slow running cron script, identified a single line of command that took more than an hour to run, everyday.
...
0
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2
answers
111
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Slowdown in Apache with HTTP/2 when Requesting Small Thumbnails (60KB) via Reverse Proxy to HTTP/1.1 Backend
I am currently running an Apache server with HTTP/2 enabled as a reverse proxy for my web application. I have noticed a significant slowdown when requesting a large number of small thumbnails (each ...
1
vote
1
answer
70
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Disk saturated by mariadb on CentOS 7, blocks everything
For the past few days I have been having a problem with a webserver running CentOS 7. Every 13-14 minutes some operation (which I identified with mariadb using iostat) seems to completely saturate the ...
3
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0
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115
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Reading from software RAID in parallel is slower than it "should" be, given other benchmarks
Note:
I have seen some somewhat similar questions here, but:
none of them concern reading many files in parallel, and
most are 10+ years old and concern no-longer-relevant hardware and kernel ...
5
votes
1
answer
451
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Mellanox ConnectX-7 - Unable to get more than 250 Gbit/s
I have several machines with ConnectX-7 Infiniband cards and they're plugged into an Nvidia QM9700 switch. I've confirmed 400 Gbit NDR at both ends (ibstat on the host and in the console on the ...
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183
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Inconsistent Clickhouse database query performance
Folks,
Clickhouse Server version: 22.8.21 (have tried a variety of 22.x and 23.x versions as supported by clickhouse-backup to restore my data with for testing, none seemed to improve the query ...
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1
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293
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Does reverse proxying the WebSockets servers make sense from scaling perspective?
I have reverse proxy and multiple WebSocket servers behind it. I'm confused whether it makes any sense from scaling perspective, because I see it like that:
The WebSocket server A has 30,000 active ...
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1
answer
36
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What happens on the server when a multimedia file gets downloading/playing?
I have a video-based website. It gets slow when about 1k concurrent users watch/download a video.
I'm trying to debug it to see what resource is weak to increase it. I executed htop command to see ...
8
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3
answers
1k
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Unexpected poor performance with NVMe drives on an X9DR3-F
I am experiencing what seems like uncharacteristically low performance from an NVMe SSD stripe in a server. The hardware is as follows:
Motherboard: X9DR3-F
CPU: Dual E5-2650v2
RAM: 128GB DDR3-1333 ...
0
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1
answer
42
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SAS channel speed and multiple disk setup
I have the following setup and looking for recommendations on the 2 connection options:
1x SAS Controller in HBA mode with 2x SAS Ports
2 SAS cables with 4 SAS connectors each
4x HDs with 6GB/s SAS ...
0
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0
answers
136
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Http outperformed Http2 ,why, please help me to figure out?
I'm currently conducting performance testing on my NGINX web server container and I'm encountering some unexpected results. My tests show that HTTP performance is outperforming HTTP/2, despite SSL and ...
0
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1
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92
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How to determine nginx/HTTPS encryption is my bottleneck?
I'm using a Digital Ocean droplet (like an EC2 host), it's Ubuntu 22.10, and running a node.js application. However, and this may be a bad idea, I'm running nginx on the same host and the application ...
0
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1
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241
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Why MACsec can not reach more than 2Gbits/s?
i am configuring macsec and i have discovered that, when using this protocol to send/received data, the bitrate is so low.
I am using it over a 10Gb network adaptor, using iperf3 it almost reach that ...
2
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0
answers
225
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Apache creates ~3x as many threads as MaxRequestWorkers
I'm hosting a non-profit community wiki for the upcoming video game Baldur's Gate 3. Since it looks like the game is likely to have millions of players, we started worrying about server capacity.
I'm ...
3
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2
answers
2k
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Test network transfer speeds with rsync from a server with limited storage
I want to test transfer speeds from server A to server B, but server A has limited disk space (<50GB) and because the network speeds are fast within the same data center, transferring 50 GB may be ...
0
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72
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How to figure out what makes a Linux workstation slow?
We have this ThinkPad X240, 8GiB of RAM, an i5 4300U, and a Toshiba SATA SSD. The machine is running Linux Mint 20.3.
The user complains that it is very slow. Mostly when the browser is open and ...
4
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1
answer
7k
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Understanding EBSByteBalance% in AWS RDS gp3 volumes
I am troubleshooting an AWS RDS Postgres instance that has been restarted by AWS several times in the last few days, very likely due to resource constraints. It's a testing DB that usually doesn't do ...
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151
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Performance for static files (HTML, CSS and JS) of PHP Server - CDN vs NGINX
Without going too much into detail to avoid that this question becomes opinion-based; so talking from a purely technical perspective: When you currently have a PHP-Apache setup, both PHP and Apache ...
1
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0
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67
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Is there a system/computational overhead when using AccuracySec=1s in systemd timers
systemd timers by default have 1 minute accuracy, however it is easy to change that with AccuracySec parameter in the timer definition.
I can't find any information related to whether setting accuracy ...
0
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0
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448
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LVM Thin pool performance with NVMe
I have 24 Samsung PM1733 7.68 TB and a server platform Gigabyte R282-Z94 with 2x 7702 64cores AMD EPYC. OS: Oracle Linux 8.6, 5.4.17-2136.311.6.el8uek.x86_64
I need this server for testing so I have ...
1
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2
answers
226
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Prefetched Small File Cache
First, my use case: On my Linux-based server I am getting unsatisfactory disk IO performance for small files, and am limited to the approximately 100 IOPS that a 7200rpm HDD will support. This is of ...
-1
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2
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817
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nginx and php-fpm waiting for server too long
I am using docker to mount nginx and a PHP-FPM using Phalcon Framework and React as the front end
`upstream fastcgi_backend {
server bfy-%APP_VERSION_UID%_buildify-php-fpm_1:90%FPM_PORT_PREFIX%;
}
...
0
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0
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136
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performance issue when linux(ubuntu) work as router with ip_forwarding enable
I'm running a test with this topo: tester---(port1)ubuntu_linux(port2)----tester. I enabled ip_forwarding in ubuntu_linux by : echo 1 > /proc/sys/net/ipv4/ip_forward
The tester is trying to find ...
1
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0
answers
883
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MAMP Websites taking more than 20-25 secs to load, but sometimes
I'm using MAMP Pro on my Mac (Monterrey) and since a couple weeks I've been having a strange problem. After several tests I've been unable to find out where the problem is, but this is what happens.
...