Questions tagged [performance]
Questions about server hardware and software performance, or network performance.
3,186
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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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0
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826
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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 ...
user537469
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0
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71
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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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1
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62
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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 ...
- 135
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3
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63
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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-...
- 171
3
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2
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204
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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 ...
- 131
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1
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341
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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
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1
answer
404
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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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1
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2k
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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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141
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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:\<...
- 123
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177
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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 ...
- 192
1
vote
1
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410
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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 ...
- 4,503
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612
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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 ...
- 121
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127
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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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2
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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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174
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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 ...
- 141
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5
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837
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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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1k
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Very bad ImageMagick resizing performance after upgrade from PHP 5.5 to Docker + PHP 7.4
I’m upgrading some system from PHP 5.5 (installed directly on AWS EC2), to PHP 7.4 in Docker (running on AWS EC2 using Docker Compose). The performance for image resizing using ImageMagick has ...
- 401
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2k
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Gluster Performance
currently I try to setup a Gluster cluster and the performance is strange and I'm not sure, if I configured something wron. I'm using 4x Hetzner root server running Debian Buster with Intel i7, 128GB ...
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917
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Production server much slower then local test server when sending large request
I am running a django app and I am trying to send an API POST-request which is pretty big to my production server.
Now the problem is that what takes 4 seconds locally takes 1 minute in production. ...
- 231
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2
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577
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Is there a speed and performance difference between VPNs (L2TP, etc.) vs. port forwarding?
Let's say you wanted to transfer a 1 GB file from a machine at site 1 to a machine at site 2. You can either connect the two machines via a VPN (L2TP) or basic port forwarding. Which connection method ...
- 559
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76
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Strictly segregate traffic in nginx reverse proxy?
I have nginx configured as a reverse proxy. It proxies two upstreams not under my control: Speedy and Flaky.
Speedy has consistently high uptime and consistently low response times.
Flaky sometimes ...
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1
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293
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What are the server requirements in terms of CPU, RAM and bandwith for etherpad-lite? [duplicate]
As my previous post was marked as duplicate of a very generic question, I want to post here again,as i found an answer :-)
For an event with 500 to 1000 participants we plan to use etherpads for ...
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1
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2k
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Postgres SELECT extremely slow, EXPLAIN ANALYZE SELECT not slow at all
Some time ago my team noticed extreme slowness in SELECT queries on our production server. For a table with over 1 million rows, we're talking about a couple of minutes. These are simple queries, e.g.
...
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1
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809
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HTTPS session resumption sometimes partially working
I'm having an issue with ssl session caching. To test if server configuration is OK, I use the following command:
echo | openssl s_client -connect <server.com>:443 -reconnect 2>/dev/null| ...
- 71
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0
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586
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Apache2 mod_dumpio logged output bytes does not match %O in access.log
I'm trying to understand why responses sent by my server are long despite the content (+header) being small.
For that I'm using mod_dumpio to log all data received and sent by apache. But the logs ...
- 71
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1
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421
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Windows vps performance
Windows vps performance is not as expected while I see this message in /var/log/messages.
[ 7283.526915] kvm [34279]: vcpu0 disabled perfctr wrmsr: 0xc2 data 0xffff
Its a KVM vps on 3.10.0-1127.19.1....
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33
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500 Gateway with EC2 m5.2xlarge
I have an EC2 m5.2xlarge
with wordpress and the following server configuration:
https://pasteboard.co/JwP5Ecg.png
How is possible to receive a 500 Gateway Error for importing a csv with 50 users (45 ...
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The causes for frozen server
We built one windows 2012R2 server (it has enough free memory/disk space, high performance of CPU), but it would be frozen for around half hour every 12 hours.
The symptoms:
couldn't access the ...
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277
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Is RAID 6 a good choice regarding performance on server used for computation?
We are operating a server for doing computations with large data sets (100GB - 5TB) for a small group of researchers (10-20 people). At the moment we are running 4x8TB spinning drives in a RAID 6 ...
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119
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Switched from Heroku to Scaleway and server is much slower
I recently moved our backend services from Heroku (hobby-Tier (8€/month)) to Scaleway (DEV-L, 20€/month) as well as the database (similar prices).
We did this because of all the issues with the ...
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374
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Why should I buy a server CPU rather than a standard one? [closed]
I'd like to research the possibilities of migrating some of our servers to newer hardware.
Since I was only building personal/gaming PCs up until now, I'm beginning to realise I don't know much about ...
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3
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5k
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Tmpfs vs NVME SSDs from performance POV [duplicate]
I have a script that creates large temporary files.
I'm inclined to use tmpfs for this, however I did a quick search for tmpfs performance and found this which reports speed as about 2GiB/s.
Modern ...
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2
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2k
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What could cause high iostat await if a disk isn't overutilized?
I have a database running on GCP. Occasionally it gets very slow for a period of minutes (like average statement execution time spikes by 10x or more). The slowness is correlated with increases in the ...
google-cloud-platform
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353
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Application slowness due to Tomcat waiting for readLatch
we are getting issues reported by our clients that the application is slow at times, while checking the slow requests (using Glowroot) we could find quite a lot of threads getting stuck in org.apache....
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847
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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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175
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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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595
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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 ...
- 111
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29
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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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26
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7k
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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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219
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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 ...
- 559
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2k
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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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104
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MYSQL vs. InnoDB [closed]
mysqltuner output.
-------- Storage Engine Statistics -----------------------------------------------------------------
[--] Status: +ARCHIVE +BLACKHOLE +CSV -FEDERATED +InnoDB +MEMORY +MRG_MYISAM +...
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140
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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 ...
3
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1
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1k
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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 ...
- 209
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43
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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 ...
- 101
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1
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4k
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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 ...
- 103
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0
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304
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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 ...
- 295
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45
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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, ...
- 101
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0
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229
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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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