Questions tagged [performance]

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

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41 views

I can't get to the perfect speed [closed]

Some months ago I got a new server. This server is same that other which have other people. -Same server with same hardware -I have the same softwares: CloudLinux, cPanel, LiteSpeed and MariaDB -I ...
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10 views

Slowdown in Django/Postgres app after deploy on Heroku

Our app is a fairly standard Python/Django/Postgres app running in Docker on Heroku. Our problem is that when we do a new release we see a significant slowdown lasting about 30 seconds up to a minute. ...
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38 views

Storing BLOBs in mysql database

There's a lot of opinion about storing BLOBs in a database and I wonder if there is any actual investigation or figures on the matter. We have an application that stores images related to various ...
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13 views

Event log and performance counters correlation

Anyone else often having a need to correlate multiple log sources such as event log or various log files with performance counters when troubleshooting Windows machines? For example, we had a case of ...
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12 views

Share of users that can reach a given download speed?

I wonder about the share of the market I am losing if I build my website so that it requires a minimal given download speed to work smoothly. Thus, I search for the average distribution of download ...
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81 views

Mariadb On Amazon Linux 2 Benchmarking

I am migrating Mariadb to Amazon Linux 2 from Amazon Linux 2012 . I have run benchmark test (OLTP_READ_WRite lua) using Sysbench for multiple threads & unlimited TPS. What are other typical tests ...
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7 views

Comparing perf-tool's bitesize vs sar -d output's avgrq-sz

Here are two outputs from the same time. sar -d -p 10:14:19 AM DEV tps rd_sec/s wr_sec/s avgrq-sz avgqu-sz await svctm %util 10:14:20 AM sdc 0.00 0.00 ...
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22 views

Low performance of home RPi NAS

I'm trying to find out what's the bottleneck of my home-made NAS performance. It has two main problems: Interruptions - When copying files to/from NAS, speed suddenly drops to zero every now and then ...
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33 views

Clamd performance issues in docker image

We observed performance issues using clamd docker image (https://hub.docker.com/r/mkodockx/docker-clamav/dockerfile) for virus scanning. Our application and clamd (side car deployment) resides on the ...
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36 views

Windows 2016 Server is slow when running many (~2000) processes

We have software that runs many processes: multiple headless Chrome instances, each with a Selenium controlling process (webdriver) and a Python process (because Python is no good at multithreading, ...
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1answer
19 views

What is the performance difference between aws EC2 shared, dedicated instance and dedicated host?

I searched the web, but I did not get any information in terms of performance of your application in EC2 for each type of tenancy - shared, dedicated instance and dedicated host. The information that ...
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89 views

What specs to check for 3,000 users on webgl game?

I have a game that pretty much is composed of static files. No connection to a database is needed. Game size is about 135 mb, which needs to be loaded in order to play. Takes about 50 seconds using ...
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40 views

Diskspd testing decision support

I inherited a decision support environment, which I have issues related to disk slowness in VMWare/SAN environment. the data filegroup contains 4 datafiles with each datafile on a SAN logical volume. ...
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21 views

Forcing Linux (Ubuntu 18.04) to deallocate some cache prior to high priority job

I have a server that periodically has to do a high priority job as quickly as possible. I know before hand when the job will need to run. I want to tell Linux to do all it's housekeeping a few seconds ...
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Is it reasonable to use NFS on a production web server?

Can NFS be reasonably used on production servers as a means of connecting a compute server to a storage server, assuming the connection is over a LAN 1Gbe or 10Gbe connection? There's obviously some ...
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60 views

Docker on OS disk VS docker on dedicated disk

We have 57 rhel servers machines – with version 7.5 The machines have strong HW as 128G memory and 32 CPU , We planed to install docker service on all machines , in order to run couple containers on ...
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156 views

RDS MySQL Insights: Top Query “commit”

We are trying to reduce the load on our AWS RDS instance by going through the performance insights. The top SQL statement listed in the insight is "commit": In particular, the commit ...
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18 views

Jboss 7.2.6 vs 7.2.8 Performance Drop by 50 %

I run a Webapplication in front of an Oracle DB with Jboss 7.2 Recently I updated from 7.2.6 GA to 7.2.8 GA and recognized some serious Performance Drops after running my standard Jmeter-Test. In the ...
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15 views

If Docker registry and daemon are on same machine, can “docker pull” be accelerated?

If I push an image to a machine running a Docker registry, and then use this image for a docker daemon on the very same machine, I first have to docker pull. This seems wasteful, as it triggers an I/...
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10 views

Get current usage of postgres DB as a percents of maximum

Is there any way to get current metrics (average transactions per seconds, KB read/write, etc) and potential maximum of postgres database?
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1answer
70 views

MYSQL vs. InnoDB [closed]

mysqltuner output. -------- Storage Engine Statistics ----------------------------------------------------------------- [--] Status: +ARCHIVE +BLACKHOLE +CSV -FEDERATED +InnoDB +MEMORY +MRG_MYISAM +...
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disk I/O latency spikes (contains log files from amplify)

Ubuntu 18.04 LTS server, disk is ssd. Application stack is: mongodb, node, nignx and some python. Server is up 1 month and already had 3 OS disk fails where Ubuntu would go in read only mode. After ...
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1answer
84 views

Confirming parameters for XFS filesystem and LVM volume striping over 2 ADAPT (RAID6-like) volumes

We are setting up an ADAPT0 (RAID-60-like) configuration for a file server. We have six disk pools. Each consists of 14 disks and is set up using ADAPT. According to Dell's official white paper, ADAPT ...
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23 views

Linux software raid slow until reboot

I am running an debian 10 machine with 3 4tb hdd drives. Each drive has a 1GB partition for a raid1 for the boot and the rest of the disk is configured as a raid 5 for lvm. After a while of running I ...
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1answer
76 views

How to do performance tuning of Apache server?

We have an apache server 2.4.X which we are using as a reverse proxy in front of one Java Application . We have enabled Apache status module Apache Status and we are able to see that number of idle ...
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22 views

Syslog servers - what is “normal” throughput? (Windows vs Linux)

Working in an almost Windows only company - and need to set up a syslog server recieving messages from our proxy, firewall and VPN-applicances. For now we have decided to use Kiwi Syslog server, but ...
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1answer
20 views

SpectreV1 Mitigation Performance profiling

I am trying to measure the system performance when spectreV1 mitigation is on. I am using stress-ng for that. So far I have tested the system with various stressors like cpu, qsort, str, matrix, ...
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23 views

Ultra slow upload speeds with SSL

My wordpress website subdomain upload.website.com bypasses cloudflare. Uploading to https://upload.website.com is extremely slow - 3 - 15 mins for 100mb However I did some speed tests on the server ...
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1answer
84 views

How fast is decryption by a YubiKey? [closed]

Do YubiKeys decrypt GPG or SSH/SFTP data directly within themselves? If so, would that cause a bottleneck? Do YubiKeys have accelerated AES hardware that does most of the heavy lifting of decryption? ...
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34 views

Cassandra startup issue

I've ran into a problem with my cassandra cluster. It contains 15 nodes 32cpu/120gb ~1TB of data per node. Today one of my node started to timeout client requests. Any OS performance checks show low ...
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15 views

Crazy remote VPN server slowness until 9AM EDT then fine

(I posted this on stack overflow and was told that's the wrong forum for this. If ServerFault is also the wrong forum, please suggest another sister stack exchange.) I'm out of ideas. A Synology file ...
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8 views

Request “wait” time is high. Do you see any issue with this HTTP2.0 header?

In my website, only one request,(ie. the root request) is taking more time. Especially the "wait" time is high. The HTTP2.0 Header for the request that is taking more time is posted below. ...
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102 views

ubuntu 20.04 network speed is reduced by 50%

I installed ubuntu 20.04 on two new servers at Hetzner. When I test the network speed with iperf3 between the servers I get 500Mbits/sec while this should have been 1 Gbits/sec. I raised the question ...
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2answers
133 views

How costly are nginx variables?

nginx FAQ Is there a proper way to use nginx variables to make sections of the configuration shorter, using them as macros for making parts of configuration work as templates? ) saying (bold is mine): ...
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74 views

Performance of different DIMM modules setups

I am trying to achieve fastest possible DDR3 DIMM modules setup. I have researched available benchmarks, I was able to came to (reasonably satisfactory) resolution between these pairs 1DPC UDIMM vs ...
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1answer
31 views

Does graphics card affect the server performance

I was wondering does graphics card actually improve the performance of the server or a dedicated cpu is already enough to do the job. If graphic cards capacity is needed how many does it required? If ...
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1answer
33 views

Suspicious ksoftirqd_1 process using high cpu [duplicate]

I run this webserver that serves data to a couple of apps. In the last couple of days I have noticed that some requests take some more time than usual, so I did a top to find out what's running and ...
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36 views

How to increase amount of concurrent connections in apache2?

I am running into traffic issues as apache 2.4.18 maxes out on concurrent connections: ps auxf | grep apache2 | wc -l 258 As soon as 258 is reached the server is waiting to serve new connections ...
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1answer
304 views

Intermittent KVM performance issues causing performance glitches

We are currently hosted on a hosting provider that allows us to set up multiple virtual machines using KVM, where each virtual machine runs on it's own physical box (ie: one hypervisor, one VM with ...
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2answers
52 views

Performance differences between EXT4 and XFS on kernel 4.15.0-76

OS: Ubuntu 18.04.4 LTS Kernel version: 4.15.0-76-generic Storage type: RAID10 (4 x SSD) Question: is it a bug for this version of kernel? EXT4 run a lot slower when we perform same SQL insert test; ...
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35 views

How to find the bottleneck on a virtual server?

I have purchased a cheap virtual server (running with Ubuntu, with 4 virtual? CPUs and guaranteed 8GB RAM, SSD). I started Tomcat8 with my web application (with -Xmx4096m). The startup time is very, ...
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1answer
36 views

Wrong link speed; what happens if manually set speed using ethtool fails?

I've got a remote xen server and I noticed that the speed link in autoneg is 100 Full Duplex; all my network is 1000 Full Duplex; do you know any reason for this? Ethtool mentions on both my server ...
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28 views

Performance Issue

I'm doing some experiments with my application. My application is in a Docker container and it is programmed to send 4 request every second to a web-server. When I host 30 containers on a single ...
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2answers
75 views

Why are concurrent downloads faster

Many download managers like this, this and this support downloading a file over multiple parallel connections, one per thread. The concept is that each connection will download one part of the file ...
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1answer
229 views

Huge MFT and slow performance

I have a Windows Server 2012 R2 with huge MFT and slow performance when listing file in folder. Filesystem is about 350.000 files but in past many millions file was created and delete with crap Backup ...
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180 views

TTFB on AKS rises to ~7 seconds after ~100 concurrent API calls

I have a setup of AKS->Traefik(Ingress)->Docker(pod)->NGINX->Gunicorn->Django->SQL Server on Azure. on AWS my response times for a page that does ~100 requests to my API ~4.5 seconds to fully render, ...
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89 views

How does avgqu-sz size in iostat output relate to r_await and w_await?

Can someone explain what does avgqu-sz mean in the output of iostat? The manual page states like this. avgqu-sz: The average queue length of the requests that were issued to the device. Can ...
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0answers
41 views

zfs not using full disk I/O

I have setup zfs on a fresh Ubuntu 20.04. But speed seems awfully slow. The disks can deliver 140 MB/s if run in parallel: $ parallel -j0 dd if={} of=/dev/null bs=1M count=1000 ::: /dev/disk/by-id/...
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1answer
287 views

Pages load only when you restart php-fpm

So here's more context in a GIF Notice how pages do not load on link clicks, but as soon as you run service php7.2-fpm restart it instantly loads the page and like that with every page. What is ...
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1answer
24 views

If you have fetched a subdomain, what lookup related performance implications are there for accessing another subdomain on the same TLD?

Consider this example. My browser visits the following URL: foo.foobar.com The page on the domain creates an iframe for bar.foobar.com Both domains are hosted in AWS Route53 as aliased A records =>...

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