Questions tagged [performance]

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

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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 ...
user586883's user avatar
0 votes
1 answer
28 views

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 ...
Eliot's user avatar
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-1 votes
0 answers
35 views

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 ...
srhslvmn's user avatar
0 votes
0 answers
63 views

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-...
jamminjames's user avatar
6 votes
2 answers
338 views
+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 ...
Anatolii Tk's user avatar
0 votes
1 answer
82 views

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 ...
SAM's user avatar
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2 votes
1 answer
58 views

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 ...
symcbean's user avatar
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2 answers
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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 ...
Theramist's user avatar
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23 views

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 ...
Josh James Saunders's user avatar
1 vote
0 answers
16 views

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 ...
Mikko Rantalainen's user avatar
-1 votes
1 answer
217 views

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 ...
Victor Leal's user avatar
9 votes
2 answers
1k views

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 ...
Josh Hibschman's user avatar
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57 views

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 ...
Pere's user avatar
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1 answer
121 views

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, ...
Chris Kooken's user avatar
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31 views

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 ...
Tomasz Grobelny's user avatar
-1 votes
1 answer
97 views

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 ...
some user's user avatar
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6 votes
1 answer
879 views

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 ...
Jacky Lee's user avatar
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0 answers
25 views

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 ...
devstability's user avatar
0 votes
1 answer
83 views

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 (...
Felice Pollano's user avatar
0 votes
1 answer
83 views

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 ...
Alireza Mirhabibi - IRAN's user avatar
1 vote
1 answer
77 views

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 ...
Paflow's user avatar
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0 votes
1 answer
156 views

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 ...
Erik Baan's user avatar
  • 101
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0 answers
141 views

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=...
Christian Willing's user avatar
0 votes
2 answers
587 views

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 ...
Ben Rubin's user avatar
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1 vote
0 answers
184 views

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. ...
lowkey's user avatar
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0 votes
1 answer
30 views

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 ...
NeG's user avatar
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0 votes
1 answer
48 views

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. ...
Jimmy Chi Kin Chau's user avatar
0 votes
2 answers
111 views

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 ...
xhighway999's user avatar
1 vote
1 answer
70 views

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 ...
Gregorio Pellegrino's user avatar
3 votes
0 answers
115 views

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 ...
Daniel McLaury's user avatar
5 votes
1 answer
451 views

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 ...
Evan's user avatar
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0 votes
0 answers
183 views

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 ...
gwvandesteeg's user avatar
0 votes
1 answer
293 views

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 ...
Szyszka947's user avatar
-1 votes
1 answer
36 views

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 ...
stack's user avatar
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8 votes
3 answers
1k views

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 ...
Bryan Boettcher's user avatar
0 votes
1 answer
42 views

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 ...
Marc's user avatar
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0 votes
0 answers
136 views

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 ...
Mhd HZ's user avatar
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0 votes
1 answer
92 views

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 ...
Edmond Meinfelder's user avatar
0 votes
1 answer
241 views

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 ...
RandomUser8888's user avatar
2 votes
0 answers
225 views

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 ...
TaylanKammer's user avatar
3 votes
2 answers
2k views

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 ...
philshem's user avatar
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0 votes
0 answers
72 views

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 ...
Pierre's user avatar
  • 81
4 votes
1 answer
7k views

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 ...
MoWo's user avatar
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0 votes
0 answers
151 views

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 ...
DevelJoe's user avatar
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1 vote
0 answers
67 views

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 ...
oᴉɹǝɥɔ's user avatar
0 votes
0 answers
448 views

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 ...
shallrise's user avatar
1 vote
2 answers
226 views

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 ...
lte678's user avatar
  • 13
-1 votes
2 answers
817 views

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%; } ...
Apoorv dev's user avatar
0 votes
0 answers
136 views

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 ...
Hans Yin's user avatar
1 vote
0 answers
883 views

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. ...
Arturo's user avatar
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