Questions tagged [performance]
Questions about server hardware and software performance, or network performance.
3,087
questions
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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 &...
2
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0answers
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 ...
-1
votes
1answer
40 views
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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0answers
8 views
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 {
...
0
votes
1answer
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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0answers
23 views
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 ...
-1
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0answers
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 ...
-1
votes
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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0answers
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 -...
-1
votes
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 ...
1
vote
1answer
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 ...
1
vote
1answer
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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votes
3answers
69 views
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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0answers
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 ...
0
votes
1answer
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 ...
0
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1answer
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 ...
0
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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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1answer
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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0answers
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 ...
0
votes
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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0answers
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 ...
2
votes
0answers
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....
0
votes
1answer
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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0answers
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 ...
0
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0answers
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 ...
1
vote
1answer
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:
-------------------------------------------------------------...
1
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1answer
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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0answers
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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0answers
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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0answers
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 ...
0
votes
1answer
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 ...
0
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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-...
3
votes
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 ...
0
votes
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 ...
2
votes
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/...
0
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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 ...
1
vote
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:\<...
0
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0answers
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 ...
0
votes
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 ...
1
vote
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 ...
2
votes
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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0answers
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(...
2
votes
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 ...
3
votes
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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0answers
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 ...
0
votes
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 ...
0
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0answers
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 ...
0
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0answers
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 ...
0
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0answers
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 ...
