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Questions tagged [performance]

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

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Object Storage vs HDD Block Storage

Currently I am using SSD Block Storage at Digital Ocean which is very costly. When I checked Vultr they are providing HDD Block Storage. Which is cheap. We have to store approx 700GB of data (Mostly ...
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-2 votes
0 answers
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Blazor site on IIS - very bad performance with simultaneous users

this is my first post here because I am a bit frustrated. I found no answer. I have prepared website for sport bookings in Blazor Server-Side (.Net 5) and postgres DB. The site was deployed on VPS (2 ...
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3 votes
2 answers
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KVM: Best performance for all guests

With KVM, what is the best way to provide the highest possible performance to all VMs? The host has a hexa-core processor and 64GB of ram. 3-4 VMs should run on it. The VMs are idle a lot of the time, ...
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How to check if RAM I/O bandwidth is a bottleneck for my application on Linux Ubuntu?

I have two Ubuntu systems (A & B) The same application performs much better on the system A even though A has less cores and less RAM. On System B, there are many more cores and much more RAM but ...
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-2 votes
0 answers
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Does Network Card slow down when there are a lot requests

App1 makes 100k+ requests/minute. App2 on same PC/different CPU core, occasionally doing some requests. The bandwidth is 10Gb/s both NIC and network and is not a problem here. Would App2 experience a ...
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1 answer
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Simple haproxy TCP passthrough results in very slow network transfer speed

I've setup a simple haproxy instance on a clean install of Debian 10 Buster. I've added some simple necessary config to enable the passthrough to the IP address in question (which has been redacted in ...
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1 answer
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VMWare Disk Performance

I have an HP ProLiant DL380p Gen8 (VMWare 7u3 installed) with 2 pieces of 960GB SSD RAID1 arrays (total of ~1+1=2GB usage). The rest of the configuration is like 24 CPUs x Intel(R) Xeon(R) CPU E5-...
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centos7.9 mdadm raid0's performance which is only 50% of centos8 mdadm raid0

I use the same PC and same NVMe SSDs do the raid performance test on different OS. The steps are as follows: mdadm -C -v /dev/md0 -l0 -n4 /dev/nvme[0123]n1 mkfs.xfs /dev/md0 mount -o discard /dev/md0 ...
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1 vote
1 answer
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Tuning ZFS for bursty sequential writes

This is a follow-up to: High speed network writes with large capacity storage. The setup has changed notably. I have a pool with a single raid-z2 with 6 drives, all Exos X18 CMR drives. Using fio and ...
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enough memory for downscale ubuntu server?

Management decided to downscale prod server. Current size: Standard B16ms (16 vcpus, 64 GiB memory) Desired size: Standard B8ms (8 vcpus, 32 GiB memory) CPU is mostly idle (output is from sar -u)...
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1 answer
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Why is my Laravel App having 3+ seconds TTFB in Production?

I've looked around but can't find a definitive answer on if things like Images affect TTFB which would be my best guess as to why my site is taking so long to load in production. After the page is ...
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1 vote
1 answer
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What do results of Linux time wrapper tell me happened to this cp command?

My view on this issue is from the developer side. I write the code that gets placed on a RHEL virtual machine running as one of many in an enterprise system. The filesystem being used is a remote, ...
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1 vote
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Many resource-hogging iexplorer.exe processes on all workstations

Suddenly all our workstations are having an issue with sluggish performance. Inspecting task manager, there is a common culprit: several iexplorer.exe processes exist (~7 on average, but varies with ...
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How can I get the Resource Monitor counters into perfmon?

While troubleshooting an issue, I found that the counters available in the Resource Monitor were very helpful. In particular, it can show, for the entire system, and for a specific process, the ...
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Can node and nginx use the same cores simultaneously on a dedicated server safely (no docker)?

I have a 16 core 64 gigs of ram dedicated server running ubuntu 20.4. I'm running node / express in pm2 cluster mode and also a nginx reverse proxy on the same server without docker. No other services ...
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1 vote
1 answer
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NVMe SSD poor writing performance on Debian 10

I just went for some disk performance tests on my DIY NAS and noticed some very poor performace results with my NVME disk writes ! My NAS runs Debian 10 with this config : ASROCK X470D4U with Ryzen 5 ...
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Is it possible to improve shared-cpu-vps hosting performance with a keep-alive? Or something else?

Taking the leap from dedicated to shared-cpu-vps and have just one major concern: I will no longer have a dedicated CPU. In past tries with vps hosting, I've noticed my servers sometimes don't respond ...
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Apache2 too many requests "waiting for connection"

I've got Apache 2.4 installed with the event mpm module which seems to have too many idle processes Most of them are waiting for connection and a fraction of those requests are being processed at a ...
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0 votes
1 answer
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Is it necessary to ban malicious IP regardless of default firewall setting being deny/reject?

I'm on Linux and using fail2ban as the ban system. So far, it has collected and banned about 150K of malicious IPs, and I'm concerned and wondering if this will gobble a fair amount of resources. As I ...
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15 votes
1 answer
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What's the difference between a "degraded" RAID 6 array and a "clean" RAID 5 array?

Suppose you have two RAID arrays, one with N disks and one with N+1 disks. The array with N disks was formatted as a RAID 5 and left alone, while the other array was formatted as a RAID 6 before one ...
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How can I monitor asp net application?

I have a web application (asp.net) with a SQL database used by many users (> 10k) deployed over three different machines. What are the factors to monitor like traffic or latency, etc? I've already ...
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0 votes
1 answer
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High util iostat

I have server with oracle db. It works on Dell Unity storage. The server has very slow disk IO. How can I fix it? Here are some details of my server: OS - OL8 Kernel - 5.4.17 uek Storage - Dell ...
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0 votes
1 answer
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How to constraint already running interactive processes with cgroup2

My home-server is running some aged hardware (Core i5-3450, software RAID1 on SATA disks) and often has problems when I run performance-intensive things like a compile-job besides "normal" ...
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Bad I/O performance using software raid 1 on my Linux machine

I am using Ubuntu 20.04 LTS, Kernel 5.8.0-55 and have my filesystem on a md/software RAID1 consisting of two SATA hard disks as my home server system. 32 GB RAM, 4 cores (Intel Core i5-3450). It has ...
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1 vote
0 answers
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VPS performance apparently low - how can I verify?

I apologize wholeheartedly but this is probably as unspecified as it can get as for a question. I run a linux VPS and...I think it has an important performance problem, but I can't pin point what it ...
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Consul higher performance of a single server than a cluster?

We're using Consul v1.11.1 KV to store some read-mostly data(about 50 bytes per key) . I'm doing performance test on Consul get recently. Frist I use a single server(8CPU Cores,2.4GHz; 16GB RAM; 300G ...
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-1 votes
2 answers
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Disk iops vs latency

I am trying to understand the diference between iops and latency, this is my question: If an hypothetical disk had 2 io per second, then its latency would be 0.5 seconds?
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-1 votes
2 answers
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Virtual machine vs real machine server performance [closed]

I want to self-host some services (some examples include, but are not limited to, Nextcloud, Matrix, Jitsi, Bitwarden). For security reasons, I don't want to install all of them on the same machine ...
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0 votes
1 answer
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Disk read metrics not showing for postgres activity

I've long noticed that ESXI wasn't showing disk READ activity for my Ubuntu Postgres database server. I figured maybe it was just a weird bug with ESXI, as it would show disk WRITE activity. I decided ...
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9 votes
6 answers
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What Ethernet twisted pair cable is best with a particular Ethernet switch

tl;dr I want the best supported Ethernet cable for my Ethernet switch. How do I correlate Ethernet cabling speeds measured in hertz with an Ethernet switch "speed" measured in bits-per-...
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1 vote
0 answers
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The HTTP version of my websites take a long time to resolve, while HTTPS versions instantly resolve. How to debug it?

I create many websites for my customers. And I register domains via different registrars. And I have a couple of VPS servers, distributed in different data centers. However, I see this weird behavior. ...
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1 vote
0 answers
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High Load Average in Solaris Operating System - Due to high read I/O

In Linux OS, the load average is dependent on multiple factors like CPU utilization, number of uninterruptible sleep processes, and others. On the other hand, Solaris OS load average is dependent on ...
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0 votes
1 answer
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What could be causing twitterbot to take 6s to download small image assets?

Many (most) times twitter makes http requests for certain images, the response time (as recorded by nginx in the logs) takes 6s. Yet other sites (e.g. facebook) and sometimes twitter, typically get ...
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-2 votes
3 answers
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best filesystem for millions of files [closed]

Which Linux filesystem/setup would you choose for the best speed in the following scenario: a few million files ~3mb file size on average random access to files need to get a list of all the files ...
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1 vote
0 answers
167 views

Internal Seagate HDD extremely slow under Linux

This computer has a 1 TB Seagate HDD as a second drive at /dev/sdb, formatted as ext4. Recently the HDD started performing really, really slow. For example, it took almost 20h to copy ~89 GB of data ...
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0 votes
1 answer
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Assume platform performance based on Nginx - ngx_http_stub_status_module

Nginx is placed in front of a microservice architecture on which we don't have any insight. We retrieve the metrics exposed by the http stub status and would like to compute an indicator of the ...
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0 votes
1 answer
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can http clients configure if they want persistent or non-persistent connections with the http server?

I want to understand, if depending on how client configures the http connection, the server can behave in non-persistent manner or persistent manner, so in effect some clients can connect in ...
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0 votes
2 answers
100 views

Does http protocol standard support long polling?

I recently read about long-polling concept which can be used with http. I want to understand, if any http protocol standard itself supports long-polling concept, so that depending on how client ...
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0 votes
1 answer
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I have a sql server with a pictures table with 25 million entries and it has become too slow to query. currently have a xeon E5-2667v3 with 32g of ram [duplicate]

I have a sql server with a pictures table with 25 million entries and it has become too slow to query i currently have a Xeon E5-2667v3 with 32g of ram, I am looking to get a hp ProLiant Gen 9 and I ...
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How to determine disk is busy or not in oracle Linux?

I am confused, what is the command I can use to determine disk busy in Oracle Linux?. In Solaris iostat command will show %b. What is the command in Oracle Linux to show %b like in Solaris? Please ...
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1 vote
2 answers
486 views

ZFS performance: Extreme low write speed

I am running a small home server. The specs are: CPU: AMD Ryzen 5 2600 RAM: 32 GB ECC System drive: 128GB NVMe SSD Data drives: 3x 4 TB Seagate Barracuda HDD The server runs some applications like ...
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2 votes
1 answer
43 views

Windows Server Command Line for Remotly Measure Data Disk IOPS,CPU,RAM Monitoring

I want to measure data usage like IOPS, CPU, RAM ,Capacity ,Bandwidth ETC from Remote Server. I Know, that it is possible to measure it localy with the Typeperf Command. However, again, i want to ...
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Loading speed / TTFB difference between DNS change and domain transfer?

I am a Web Developer and primarily create Websites with Gatsby.js or Next.js. Most of my Customers either already have a Website or have bought some kind of web hosting to secure their domain name. ...
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2 votes
1 answer
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SSH keys: ed25519 vs RSA performance demystified

It is claimed that ed25519 keys are better than RSA, in terms of security and performance. In terms of security, I understand that 4096 bits RSA keys are practically unbreakable for the foreseable ...
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1 vote
1 answer
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Fragmented directory on ext4?

My ext4 filesystem loses performance when growing. I have a system storing a lot of image files. This Debian based image server stores image files divided in year folders on 1-2TB disk sets with ...
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0 votes
0 answers
61 views

Nginx performance change between 1.16.2 and 1.19.1 or higher

We have noticed significant performance degradation by using recent NGINX version 1.19.1 or higher. The previous version that have used without any problem is 1.16.1 with openssl 1.1.1g. To upgrade ...
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1 vote
0 answers
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Couchdb 3.1.1 increases disk latency gradually over weeks

I've been dealing with this issue for weeks now. I have the followin scenario: couchdb2.3.1-A <===> couchdb2.3.1-B <===> couchdb3.1.1-A <===> couchdb3.1.1-B where <===> ...
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2 votes
2 answers
216 views

High speed network writes with large capacity storage

I have a NAS running Samba with a 20T ZFS pool with one raid1 vdev with two spinning rust drives. I have 16G RAM in the machine right now. The storage is used for continuously growing, permanent ...
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0 answers
62 views

Apache crashing because of high memory usage

CPU[|||| 3.3%] Tasks: 71, 155 thr; 1 running Mem[|||||||||||||||||||||||||||||||||||||||||||||||||1261/1875MB] Load average: 0.00 0.02 0.01 ...
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How to increase the block size of an ext4 filesystem beyond the 4KB limit?

Is there a way I can increase the blocksize of my filesystem (ext4) beyond the 4KB limit? I want to increase the random read/write speed of my filesystem by increasing the block size but I can't go ...
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