Questions tagged [performance]
Questions about server hardware and software performance, or network performance.
3,186
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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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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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489
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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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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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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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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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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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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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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
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670
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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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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 debug the cause of my suddenly extremely slow running database backups maintenance plan?
(Originally posted on DBA.StackExchange.com but closed, hopefully more relevant here.)
Alexander and the Terrible, Horrible, No Good, Very Bad...backups.
The Setup:
I have an on-premise SQL Server ...
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How to scale OpenVPN when client-to-client is a must?
I am trying to create an OpenVPN server cluster that can autoscale, I have found a lot of information online on how to create such a network.
As far as I understand, you basically use a round-robin ...
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High CPU usage by Apache/MySQL
I have a problem with CPU usage on the website that uses WordPress, Apache, and MySQL. During the day, from time to time, CPU usage by MySQL and Apache goes up to 2400% (I have 24 cores in total), the ...
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8 x 15k SAS hdd disk with raid 0 performance vs single SSD disk for database [closed]
Which one has a better performance for database application (e.g. postgres) if we just consider read/write operations speed and not fault tolerance
8 x 15k SAS hdd disk with raid 0
single SSD disk
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Poor disk throughput on Google App Engine
Is there any way to manually provision IOPS for the disk used by the instances on Google App Engine?
The default throughput I get with a 256GB disk is terrible (60MiB/s burst, after which is settles ...
google-app-engine
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Some process are in unkillable sleeping state while i/o is low
I am the system administrator of an Arch Linux-based workstation. Our workstation uses Slurm as the load manager and consists of one master machine and 4 other computation nodes. In the past few ...
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TCP Handshake and TCP RTT when using VPN
From my server I'm measuring the TCP RTT and I was wondering what would be the difference between clients that use VPN compared to non-VPN clients.
So in the case of a non-VPN client the TCP session ...
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Windows RAID drive performance suddenly dropped
I have a Windows system that has as a data drive, one RR640L controller. Attached to this controller are four 2TB drives in a RAID5 configuration (2 Seagate ST2000VN000 and 2 Samsung HD203WI).
...
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Cache Images centrally
Application: Serve responsive and optimized images on the fly by cropping/resizing/compressing master images
Current Load: 10k request per minute, ~60MBps traffic.
Current Config : NginxPlus LB sits ...
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RHEL8: Does NFS I/O count as part of "%iowait" calculations?
Customer telling us that they see high %iowait in top and iostat output on a busy RHEL8 NFS client.
iostat man page clearly says that iowait is related to % of time kernel is waiting on "disk&...
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MySQL - Select queries 10x slower on Azure VM vs on-prem VM
We have been working on a project to migrate a MySQL database from an on-premise Linux server to a Windows VM on Azure (IaaS). (There's a specific reason because of which we have gone with the IaaS ...
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Is there a program to diagnose and summarize why my mchine is slow? [closed]
Is there a program that will tell me why my server is slow? What is being over utilized? CPU / Memory / Disk / Network ... and what processes are driving that utilization? I want a program that can ...
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How to configure HAProxy to ignore client header `Pragma: no-cache`?
We have a web service behind a HAProxy server running in caching reverse proxy configuration. The backend servers send Cache-Control headers correctly for all responses so HAProxy can cache all ...
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How do I maximize nvme raid0(md) performance (in linux)?
Nvme raid0 read(and write) performance is sometimes worse than the performance of one individual underlying drive.
hdparm -t /dev/md0 :
Timing buffered disk reads: 7054 MB in 3.00 seconds = ...
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Duplicity backup is unexpectedly slow
I have a home cloud server whose data directory contains about 400GB of data.
I've tried to do a full duplicity backup on the directory. It's been running for 17 hours and only about 19 GB of data (...
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827
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PHP+Nginx response time too much
I'm running a php-fpm server behind an nginx reverse proxy which is simply serving phpinfo to benchmark the response time. The response time (using postman) for the phpinfo page is around 150ms which ...
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Hard resetting link, limiting SATA link speed to 1.5 Gbps from non-existent disk
Good morning!
Can anyone help me with a strange problem that I have in my Debian 8.8 Jessie server? I'm having these messages in my syslog:
[lun may 24 10:23:09 2021] ata9: limiting SATA link speed to ...
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Benchmarking vCore Performance
A certain public cloud provider is phasing out its old small VM instances and replacing it with a new category of instances. While the old model lists "vCore 2.4 GHz" the new model features &...
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Simulate some process IO with fio or other tool
Is there any way to track a specific process and get stats for disk IO such as queue depth, total reading/writing threads, percent of reads/writes and so on?
The main goal is to use all that ...
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870
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Ubuntu Server 18.04 slow performance
I use a server with these hardware:
Cpu: AMD Ryzen 9 5950X 16 cores
Ram: 128GB DDR4 ECC
NVMe SSD HD
There I have installed Ubuntu 18.04 LTS with latest kernel. No panels only the following services ...
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Improve web page load time (JavaScript file server)
I am trying to improve how fast our corporate web pages load up/render. Part of the problem is a bunch of JavaScript files.
If I put the JavaScript files, including the JavaScript files they each ...
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Hyper-V on Server 2019 - the larger the VHDX file the slower the disk speed
We have a brand new pair of servers for Hyper-V with fast RAID 10 SSDs in 2 arrays. On the host, using Crystal Disk Mark, I get speeds that I would expect like RND64K Q32T12 = 4712.49 MB/S while the ...
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nginx under high traffic: network goes down when log writes to disk?
An VPS with 2 vCPUs, with Ubuntu 20.04 and nginx.
Nothing changed regarding to loging: neither on nginx, rsyslogd, or journald.
I launch ab (apache-benchmark) from a nearby VPS, like this:
ab -k -c ...
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Slow backup of data from file servers with System Center Data Protection Manager 2019
I have a virtual file server cluster of 2 VMs, where each VM is running with Windows Server 2019 (8 GB RAM, 8 vCPUs). The file servers store their data on a VHD set, which is formatted with NTFS and ...
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I live in Australia, how is it that Stack Exchange is so fast without using any CDN?
I had a look at the Stack Exchange Servers:
https://meta.stackexchange.com/questions/10369/which-tools-and-technologies-are-used-to-build-the-stack-exchange-network
Seems they only have two data ...
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EBS target response time increasing before CPU utilization
I'm in a company where we have an elastic beanstalk configuration and it works fine with our CICD. The only issue is that earlier today i ran a stress test (basically just disabled AWS shield and went ...
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108
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Are multiple location blocks faster than multiple regex rewrites in a single block?
In the config pitfalls of the nginx docs, it's mentioned that regex should be kept simple. Well, in my case I can avoid it altogether and I wonder if that's going to matter in terms of performance.
I ...
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What is a dispatcher?
I have a wordpress site that was running slow so I signed up for stackify to get a performance profile of server. I dont get the same slow down on baremetal and localhost running the same site. This ...
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Server settings to improved Wordpress backend speed
You know how it is, caching plugins only make the front-end move faster but when you're logged in and browsing the wp-admin section, the Wordpress site grinds to a halt. I'm trying to increase some ...
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PHP performance improvement for 32GB RAM
I have two EC2 instances. One with 1GB RAM and 1vCPU and the second with 32GB RAM and 12vCPU.
I am running a script on cron job but I still have the same performance in both.
I tried changing ...
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587
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Apache+mod_php so slow
I have a problem setting up my Apache server with mod_php.
I have a website whose index.php page is generated in ~200ms. But Apache serves it in about 1.5sec. Why is this slowdown taking place?
If ...
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302
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Will using reverse proxy negate the effect of CDN?
Goal: Serve a specific sub directory of a domain from a different CDN (cloudfront in our case). We are thinking of utilizing Nginx as a reverse proxy to achieve this.
For example, the following ...
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Network performance with Kubernetes
I am running a small real time bidder application in Docker Swarm using host mode for networking. I found that other networking modes were giving much higher latency.
Soon I plan to switch from Docker ...
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912
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Openstack: VM disk I/O Tunning
In OpenStack, I am facing I/O performance issues. I am using virtio-scsi driver support in the quest. Currently, I am getting below mentioned performance.
WRITE: bw=37.2MiB/s (39.1MB/s), 37.2MiB/s-37....
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Remote Desktop - Does leaving a session open slow down the server?
Like many other development teams, we don't do a good job of signing out after an RDP session. I am trying to convince the team that it's important to use the "Sign Out" feature to close the ...
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What could cause processes to not be active
Running linux and executing a bunch of PHP scripts. I noticed that our CPU usage was pretty low but many processes were sleeping, so started investigating.
AWS EC2 with an S3 bucket.
I can't seem to ...
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High average load + low cpu usage + low disk usage + normal network usage + normal memory usage = ok or not?
I see high CPU average load several times a day on my server. For example, 21:20 and 22:45 on the following figure:
However, my CPU, disk, and network are all OK:
Disk
Network
CPU
Memory
Also do ...
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349
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Speed Up Self Hosted Wordpress Website
I have a DL360 G8 rack server, and I decided to self host my website on it, (on a virtual machine of course). The server itself is pretty kitted out, with dual xeons, Raid 0 drives, and 32 GB Ram (6GB ...
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776
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MegaRAID: performance difference between volumes
I have a MegaRAID SAS 9361-8i with 2x 240GB SATA 6Gbps SSD in RAID1, 4x 10TB SAS 12Gbps HDD in RAID6 and 4x 480GB SATA 6 Gbps SSD in RAID5:
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