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Questions tagged [performance]

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

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KVM-QEMU Windows Guest Memory Speed

How to speed up memory in Windows guest running on KVM-QEMU hypervisor? The memory speed differs between Ubuntu guest and Windows 2016 Server on the same node quite a lot. Same benchmark tool counts ...
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0answers
26 views

Is it possible to a 4GB ram server handle 500+ (keeps growing) concurrent users? [duplicate]

Im new to the server config world.. i dont have too much knowledge about performance. My client has majority traffic source from youtube, meaning that whenever he uploads a new video, the amount of ...
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How can I further improve Oracle 12.1 performance on RDS m4.large instance?

I'm having performance issues with my current Oracle setup. Queries are taking half a second and I can't figure out how to speed it up further. I've upgraded my RDS instance from a t2.medium to m4....
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32 views

what causing LTO 6 to write only 1.5TB? [duplicate]

enter image description hereI have been using the IBM TS2260 3580S6E Drive from 2014. From two weeks I am getting an issue with the space in the tape media. After the format while I am copying data to ...
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1answer
122 views

Why do my SSD read latency benchmarks get markedly worse when I put an XFS filesystem on top?

I am benchmarking a small server box based on the SuperMicro E300-8D. I've installed the latest CentOS 7.5 with the latest updates, 64GB of DDR4-2100 RAM, and a Samsung 970 EVO 1TB NVMe SSD. The OS ...
2
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1answer
66 views

What does new “S3 Increased Request Rate Performance” annoucement mean

On 17 July 2018 there was an official AWS announcement explaining that there is no longer any need to randomize the first characters of every S3 object key to achieve maximum performance: https://aws....
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20 views

Collectd on Solaris NFS server

I have collectd running on an NFS ZFS Solaris based server gathering NFS performance data points. Where does collectd store this information by default.
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15 views

Performance on Pinned CPU cores versus automatically managed?

I have a XenServer 7.5 environment where I'm running a single Windows VM with 16 total vCPU's. My server has dual Xeon E5-2620v4 CPU's with 8cores/16threads each clocked at 2.1GHz nominal and a Max ...
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54 views

Bad performance on better hardware

I have postgresql streaming replication on 2 hosts and I've faced with the problem of different performance compared between two servers. It looks like all sql queries on one host are slower on 70-90% ...
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43 views

Apache/2.4.34 on Ubuntu 16.04: HTTP/2 and TTFB [on hold]

The average speed to show pages on my website was about 2.5 seconds but our SEO asked to decrease this time to less than 2 seconds. I have decided to try to setup HTTP/2 on my testing server - Apache/...
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0answers
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creating an app server (data only no graphics) [duplicate]

hello i am a new person in creating a server or database for an app. and i have been wondering what exactly do i need to start a server that can handle thousands (maybe around 10,000 users request) ...
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1answer
58 views

How to get load average in Windows

In linux by "uptime" command you can get the load average in last 15 minutes. But how to get that in windows? Many had suggested alternative found here. But it is about CPU utilization where load ...
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44 views

SSD performance on Ubuntu + Nginx

I'm trying to improve the performance of server for nginx 100TB/month images distributions. But I have two problems: high CPU load and periodical splashes (I don't know why) Hardware is quite poor (...
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63 views

Is it worth using Nginx as an SSL/TLS terminator in front of Varnish, rather than just Nginx itself as a cache?

First off, as I understand it, Varnish Cache is only a HTTP accelerator, and thus does not support client-side or server-side (backend) connections over HTTPS, despite the existence of this whitepaper....
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1answer
62 views

Very high tcp retransmit rate to Internet on devices inside LAN

I work with Linux systems a lot as a developer and have a moderate level of networking knowledge, but the following situation is a real baffling mystery: I'm running pfSense 2.4.3 (that's current) on ...
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1answer
36 views

Cheapest solution to monitor gigabit internet connection performance [closed]

I want to perform speedtest-cli performance tests of the internet connection of a fibre connection which is advertised to 1Gbps at regular intervals, say every hour, for one year. I have been looking ...
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2answers
134 views

what is the relation between block size and IO?

I have been reading about disk recently which led me to 3 different doubts. And I am not able to link them together. Three different terms I am confused with are block size, IO and Performance. I ...
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1answer
27 views

UDP. Sending speed is limited by the minimal Ethernet adapter configuration

I have 1Gbit Ethernet adapter on my computer. And I have the other computer with Ethernet adapter 100Mbit. The both in one LAN and connected through the 1Gbit switch. 1 Test: I try to send from my ...
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4answers
87 views

Why does disk latency drop during periods of heavy writes?

Looking at the output of Munin's diskstats plugin (which is reading from /proc/diskstats) I'm noticing what seems peculiar to me. The disk is a SSD, and I would assume, magnetic or solid state, that ...
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1answer
35 views

Need help increasing performance of logstash

We are in the process of deploying an ELK stack and need advice and general recommendations regarding the performance of the cluster and more specifically, logstash. So the current setup we have now ...
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0answers
29 views

capturing durations (intervals) between tracepoints in perf

When using the perf tool (Linux), is there any simple and convenient way to time durations between two tracepoints? The obvious use is for syscall sys_enter and sys_exit points like sys_enter_fsync ...
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1answer
45 views

MySQL perf bad on SSD-based server. Small tables. MySQL config? RAID?

I have a couple of servers in an industrial setting (air-gapped network) that do some fairly light telemetry gathering. We generate about 10GB of telemetry history in ~30 days. All telemetry goes ...
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1answer
139 views

SSD IOPS on linux, DIRECT much faster than buffered, fio

I have a 30Tb-sized hardware RAID-6 system (LSI 9280-8e) of 10 DC-S4500 Intel SSDs that is used for database purposes. The OS Debian 7.11 with 3.2 kernel. The filesystem is XFS mounted with nobarrier ...
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1answer
1k views

cost of syscall very different on similar machines

I have two machines: 1) 2 x E5-2620 v3 @ 2.40GHz (microcode: 0x3c 2018-01-19), 8GB RAM (CentOS 7 w/ 4.11 kernel) 2) 2 x E5-2630 v3 @ 2.40GHz (microcode: 0x3c 2018-01-19), 64GB RAM (Fedora 22 w/ 4.11 ...
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90 views

IIS: Slow time-taken does not match with application api response time

We are in a situation of API Micro services architecture. There is an API endpoint (initialise), which is called by the Native. This "initialise" endpoint is further calling four endpoints. Since ...
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0answers
57 views

Ffmpeg performance after running many instances on same time

I use hangfire to run a tool to generate Videos using FFmpeg tool, what I discovered that after a high number of parallel FFmpeg execution, FFmpeg gets so slow in response I thought it was hung but it ...
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1answer
34 views

Can I compare stress-ng bogo ops/s across different CPUs?

I'm testing out a new server with a Xeon 6130 CPU and trying to compare it to an older box with the E5-2660v4. Here's a test I just ran on each box: On the 6130: # stress-ng --matrix 40 -t 30s --...
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0answers
21 views

Give read operations priority over write

I'm working on a system where I have a program that outputs high quality videos for a tv connected to an HDMI (raw 1080p data for instance) and I'm having an issue that when I copy some files to my ...
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0answers
102 views

Ubuntu Server Performance Issues with CockroachDB

I have a cockroachdb node I am playing with. My box has Ubuntu 16.4, 64 GB of RAM, 4 physical cores (Quad Core Intel Xeon 3.3 GHZ). Inserts to this DB are very slow. On a 100000 sample set, average ...
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0answers
8 views

Real World Speed Test via public Web Pages

Warning: I know up front that this is a question asking both for resources and opinions. Ideally, feedback/answers could address the spirit of the question, rather than shout it down. By spirit of the ...
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61 views

Strange await times in iostat output

I am seeing strange big numbers as w_await times (like 5 million ms) on a server with 2x SSD in MD RAID1. Scheduler is deadline. OS is Debian 9 with kernel 4.9.65-3+deb9u1. Is this just some sort of ...
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0answers
31 views

Compare performance with and without TPM module

I try to compare PC performance with TPM and without TPM module. My 1-st idea is to measure PC boot time for encrypted HDD with active TPM and with TPM disabled. What else cases suitable to do ...
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0answers
157 views

Nginx & NodeJs slow static file serving

I have a small NodeJS app, with an Nginx front to serve the static files to increase performance. The bundle.js file takes around 1s with no load, however, add some concurrent users and the bundle.js ...
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0answers
56 views

Memcpy bandwidth ~1.6x faster on 1 vs 2 socket Intel Scalable (Skylake)?

I'm in the process of porting a complex performance oriented application to run on a new dual socket machine. I encountered some performance anomalies while doing so and, after much experimentation, ...
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0answers
12 views

VPS doesn't use all assigned resources

I have a virtual machine on VMware ESXI and I assigned high resources (CPU,RAM,HDD) to that for maximum performance I want to use just this virtual machine on this server, So I want to use all of ...
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0answers
40 views

Diagnosing bottleneck or limit in haproxy

I have haproxy in front of a high performance web app. At high volumes ~11k req/sec, the server seems to hit a limit or bottleneck at the haproxy level, while the underlying server can handle more ...
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1answer
98 views

Linux: how can I determine if an application is doing sequential or random disk I/O?

Everyone knows that databases tend to do lots of small random I/O while big data things like Kafka tend to do large sequential I/O, but if I'm approaching this as a sysadmin without making assumptions,...
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1answer
118 views

contradictory results dd and iostat, ext4 and xfs, on EBS volumes

I'm seeing what seems to me to be contradictory results when looking at disk performance with dd versus iostat on two hosts (EC2 instances with an EBS drive). The hosts are identical except that one ...
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2answers
89 views

How to reduce TTFB time?

I have a website hosted by DigitalOcean (1GB Memory/20GB Disk/LON1) and CloudFlare. Lots of external librairies were from cdnjs.com, which worked well in Europe and US, but they were not stable in ...
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1answer
209 views

Can mixing RAM memory size (on its own) reduce dual channel performance?

I am considering purchasing a new laptop, specifically the Lenovo ThinkPad t580, which offers multiple memory configurations up to dual channel. Two of the many memory options (on the UK website) are: ...
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174 views

Unexpected and unexplained slow (and unusual) memory performance with Xeon Skylake SMP

We've been testing a server using 2x Xeon Gold 6154 cpus with a Supermicro X11DPH-I motherboard, and 96GB RAM, and found some very strange performance issues surrounding memory when compared to ...
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1answer
46 views

sql server slow only on LAN

I have a MS SQL Server instance on my server. Running select * from sys.columns takes 00:00 seconds. (just as a sample, most queries have same issue) When i run the same query in SSMS, it takes 30 ...
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1answer
144 views

Questions about performance, NVMe drives and virtual machines

I currently have a 4770K with Samsung 850 Evo running Ubuntu 16.04. I create and manage VMs using vagrant with Virtual Box. I recreate VMs frequently and right now, it takes roughly 36 seconds to spin ...
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0answers
82 views

SQL Server Management Studio - “Restore from Device” dialog is slow

Whenever I try to restore a database in SQL Server the dialogs take an excessively long time to open. The worst offender seems to be the "Select backup devices" modal sub-dialog from the Restore ...
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0answers
40 views

Why does my VM become slower during CPU-heavy tasks after some days of runtime?

I'm dealing with some strange problem for some time now: After some days of runtime, one of my VMs seems to become slower on CPU-heavy tasks. One example were this happens is reading virus signature ...
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1answer
92 views

Slow apache response time for json api (solved)

I've got an Apache server hosting several json APIs. This server is running Ubuntu 16.04.4 LTS with Apache and Mysql. Response times for all API are very good except for one! It takes about 5s to ...
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1answer
27 views

How do I get utilization information from my VMWare ESX server for CPU, Memory and Network usage?

Does VMWare ESX server have anything built in that I can view CPU, Memory and Network utilization? We have a single VMWare ESX server that we are trying to understand better how our VM's are ...
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1answer
43 views

GCE Persistent SSD disks allocate more IOPS than specified

I've been testing GCE and created a VM with a persistent SSD disk to test disk performance. Persistent SSD disk that I configured was 37GB, which was supposed to give me 1110 IOPS but when I run ...
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0answers
34 views

File Server performance with simultaneous read/write operation

I have a WORKGROUP network with 50+ devices, all the computers can access a Windows Server 2008 R2 server which hosts all the media in the network. When one or some of the users are copying files from ...
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0answers
34 views

Google Compute Engine drupal-2-vm cpu 100% [duplicate]

My Google compute, there is command named gRMk and get 98% CPU, how to solve this? What is this command. Can't we stop this? When we restart Apache it's gone. But after few minutes it is working. It ...