Questions tagged [performance]

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

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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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41 views

Understanding increased reading/writing times when concurrently reading/writing to NVMe drive

We're having an issue with one of our legacy applications. The application is a RIP (raster image processor), which rasterizes PDF's. There are 15 processes, 14 of which rasterize the PDF and then ...
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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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Nginx Rails 6 Passenger Download speed not consistent

Here is my conf file: server { server_name foo.bar www.foo.bar; root /home/deploy/foobar/current/public; passenger_enabled on; passenger_app_env production; location /cable { ...
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31 views

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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Bad performance with Intel E810-C 100 GbE card

I have a test setup with 4 servers, one of them is equipped with an Intel E810-C 100 GbE card. The other three have Mellanox ConnectX-5 100 GbE network cards. All four are connected to an Alcatel 100 ...
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9 views

Pure Object serving over Network

(Originally posted on StackOverflow) I would like to know what variables one has to consider when comparing different storage systems in terms of time performance for serving an object. Assume the ...
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1answer
24 views

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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17 views

Linux “most fast” SSD filesystem or configs if we don't care about data integrity? [closed]

When it comes to squeezing maximum efficiency of big[1] file read/write speeds out of ~4 SSDs RAID-0d[3] together, is there a "best"? I've been reading up on the tests between ext4, tune2fs -...
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1answer
26 views

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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84 views

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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41 views

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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19 views

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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24 views

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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19 views

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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1answer
20 views

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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31 views

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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50 views

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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1answer
51 views

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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19 views

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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43 views

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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25 views

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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28 views

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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18 views

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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50 views

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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94 views

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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81 views

Samba and luks encrypted disk together: Huge performance loss despite plenty of CPU resources, LUKS and samba alone works as expected

Setup: SSD encrypted with luks aes-xts 512 bits (256 bits AES key), ext4 filesystem dd write performance of 138 MB/s, CPU usage 97-100 % dd if=/dev/zero of=testfile status=progress bs=32M count=128 ...
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30 views

Bad docker (build) performance on encrypted mdadm RAID5 with XFS filesystem

We use a XFS filesystem on top of an mdadm RAID5 array on our server. The RAID iteself accesses the disk via LUKS mapper devides. The following sketch shows our setup: DISK1 -- LUKS -------| ...
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88 views

Poor proxmox pveperf performance on a mdadm raid 1

When running pveperf on a Debian + Proxmox PowerEdge R540 server that uses two hard drive in a raid 1 configuration (using mdadm), I get very low performances in the number of FSYNCS/SECOND: $ sudo ...
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31 views

1gb vs 10gb uplink in terms of TTFB

I am about to setup a new dedicated server, I have the option of 1gb vs 10gb uplink with a considerable price difference. I do only have 10 domains on this sever and traffic is not huge. However, on ...
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34 views

Tools for testing all aspects of service speed

We have some strange issues on our CentOS LAMP server where there are occasional severe 4-30 second delays in service despite the server being relatively low load at the time. Is there any tool for ...
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3answers
52 views

Accelerate loading time in others countries by installing some kind of VPN? (What is it called?) [closed]

My servers are hosted in France (OVH) and my users are mainly from France. I am starting to have more and more users in Asia and North America, but some of them have huge speed problems : more than 3-...
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2answers
44 views

Disk write latency with and without RAID

I have run 2 tests with different setup as explained below. I'm using Azure VM Standard D64s v3. For the first setup I have mounted 4 Premium SSD disks of 4 TB each, and am performing IO operations ...
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1answer
52 views

After migrated from AWS to Azure, API response became very slow

Our mobile APIs were hosted in AWS EC2 instance and it was working very fast, say 300 ms. Recently we migrated to Azure VM and after that, all the API responses are very slow, say 2 to 8 secs. The ...
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1answer
57 views

About IOPS of a RAID5 disk array without cache

we are using a 530-8i RAID adapter,which is none-cache supported, on a Lenovo ThinkSystem SR590 server.And we have 4 HDD(600GB/10K RPM/SAS) in the array. I read an article about calculating the disk/...
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1answer
295 views

ZFS 2.0: How can I lower CPU-load on write with very slow disks and weak CPU?

I have a small 32bit-ARM-based board with three disk attached via USB 2.0. This has been running fine with ZFS 0.7.1 and 0.6.x for a long time, and I do not mind the reduced disk performance. (I am ...
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1answer
21 views

Speed issue on using Linux subsystem search on a Windows server [closed]

I'm performing a search on a Windows server, who has a mapping to my Z:-drive (\\<servername>\<base_directory>). In there I would like to search inside a subdirectory, so we get Z:\<...
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10 views

Server Speed Test

I have my hosting from linode.com and the sites loads extremely fast even on slow internet. I have tested this at several devices and ISPs. But, Google Page Speed Insights shows a poor speed score ...
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1answer
26 views

KVM Virtualization Server - One physical disk(SSD) every virtual machine

In terms of performance, is it better to have one "big" SSD disk for several (lets say 5) virtualized guests, or a single smaller SSD disk for every virtual machine? any general draw back ...
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1answer
75 views

Raw LVM disk write is four times faster on host than inside KVM guest?

I've got a Debian 10.6 Host, with a Debian 10.6 guest. KVM/Qemu/libvirt. The host has a software RAID 10 array with 6 mechanical disks. LVM is on top of the RAID array. One LV is passed into the guest ...
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0answers
46 views

Access disk io data in linux without tools like iotop/iostat to find processes or files with IO

We have regularly high load average. With the help of a zabbix agent, I could narrow it down to be mainly because of cpu iowait (and lastly disk io). I am not allowed to install any additional ...
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33 views

Why is my mongodb setup not reaching EBS IOPS limit?

I have an application that is constantly pumping data to MongoDB. MongoDB instance is running with 2-replicas, each with 3TB gp2 EBS volume. As you can see on the following graph of irate(...
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2answers
84 views

High CPU usage of Mysqld process in Mariadb 10.3.24

We have migrated Our database from Mysql version 5.1.73 MyISAM to Mariadb 10.3.26 Innodb engine. Ever since we are observing slowness in inserts and very high cpu usage of Mysqld process. Our my.cnf ...
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1answer
81 views

Identifying saturated disks on CentOS 8

A quick background; I have a 10Gbit file server with six data SSDs running CentOS 8 and I'm struggling to saturate the line. Everything's fine if I cap bandwidth at 5 or 6Gbps. Here's some charts ...
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15 views

How to determine apache and php-fpm parameters for cpu-limited webserver

While setting up a new webserver, my performance tests have shown that I'm quickly hitting the CPU limit. This happens with various settings, with PHP-FPM workers ranging from 10 to 30, or ...
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4answers
41 views

Is loading images over HTTP a good idea to improve performance?

I was reading about HTTP/HTTPS performance and found out HTTPS adds a considerable overhead because of the encryption process. I was wondering, is it a good idea (and is it possible) to load non ...
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11 views

Performance Sending a file from one service to another within a cluster

I have a cluster with lots of different projects. I thought it would be good to have a single S3 service that would manage all the functionality of sending files to the external S3 provider. It would ...
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34 views

Reverse proxy hardware requirements for high RPS [duplicate]

I am setting up a web service that is expected to process ~100,000 requests per second. For this, I want to setup a reverse proxy that forwards requests to several back-end servers. The requests come ...
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23 views

How to increase http connections to kubernetes cluster

I am running a Kubernetes cluster with a load balancer and traefik http proxy. Our API uses ElasticSearch & MongoDb to save data. Our API is complex and takes 80ms of CPU time on each request. We ...

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