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Questions tagged [performance-tuning]

Performance tuning is the process of modifying a system to improve its efficiency. This is also known as optimizing.

9
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1answer
110 views

what is the IOPS behavior when partitions of single disk are used in an LVM?

I have an ubuntu 14.04.1 LTS server which have LVM(backed by hardware RAID5) with logical volume and a volume group named "dbstore-lv" and "dbstore-vg" which have sdb1 sdb2 sdb3 created from same sdb ...
0
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0answers
41 views

Please help to calculate MaxRequestWorkers for event MPM for apache

I am using CentOS 7 VPS with 2Gb RAM. I have upgraded apache to latest 2.4.35 version. I am worry about if my server will have great load it can switch off apache process. So I need to tune up some ...
0
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0answers
18 views

I/O performance issues with dd “benchmark” on XenServer 7.1 using SLES12-SP3 in HVPVM mode

Why does SLES12-SP3 in HVPVM mode perform that badly compared to the other two? SLES12-SP3 VM inside ESXi 5.5: Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz ...
0
votes
1answer
108 views

php memory_limit vs kubernetes resource memory limit

I'm new to Kubernetes and I'm trying to figure out what resource limits I should set for my php webapp. My first guess is that if I have configured php fpm to use a maximum of 256M of memory then ...
0
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0answers
25 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 ...
-6
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1answer
61 views

How do I tune a single-threaded server to be amazingly fast? [closed]

We have a license manager server that runs on a single host. It accepts TCP connections, performs some sort of exchange (I haven’t reverse-engineered it), and keeps the TCP connection open for the ...
0
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0answers
15 views

How to tune the performance of a Nginx webserver in ubuntu16.04 [duplicate]

My server is ubuntu 16.04 and 8 core machine with 16gb RAM. I need to get the best performance with this configuration. How can I tune the server with Nginx level and system level? Running a PHP LMS ...
0
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0answers
32 views

Website performance issue while servering a request

we have build a website to provide search in some specific area. For that we have used apache Solr (6.x), HAPROXY (1.6) and apache web server on a single system with CentOS as OS. our expected users ...
0
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0answers
153 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 ...
0
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1answer
170 views

Recommended Apache tuning configuration [duplicate]

My web server has configuration 16 GB RAM 8vCPU (Hexcore). Apache version 2.4. There will be massive site visit. So what will be the best and recommended Apache tuning configuration ? I am using ...
0
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1answer
172 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 ...
1
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1answer
65 views

Dual-port RDMA Throughput Issue

I have two nodes connected with dual-port Mellanox Connext-X3 VPI HCAs via an IB switch. The nodes are two socket machines with Hasswell CPUs and 2 16GB DIMMs per each socket (totaling 64GB). ...
0
votes
1answer
273 views

Apache handshaking slow on prefork configuration, need config tuning

My server, running Ubuntu 14/Apache2.4.7, has an htaccess redirect to force all requests to use HTTPS. Generally, it responds quickly. However, I recently altered my SSL config to restrict the ciphers ...
3
votes
2answers
212 views

DRBD weird speed dips

couple of weeks ago I made a test setup for DRBD on couple of servers. The speed was fixed 90MB/800Mb as per my config for initial sync. Now I have reinstalled the OS (CentOS 7.4) to do final install ...
0
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0answers
419 views

Glusterfs poor performance on Ovirt

We've setup an Ovirt Cluster based on Gluster filesystem. There is 51 vms (mixed environments windows,linux,bsd and so on) on Gluster Data Domain. At some hours of the day we saw "Disk I/O is ...
3
votes
1answer
56 views

Misunderstanding about Page Cache and dirty_background_bytes

I've been looking at this for a while now and things aren't lining up with my expectations, but I don't know if it's because something is off, or if my expectations are wrong. So, I've got a system ...
0
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0answers
444 views

(Get-ADUser -Properties proxyAddresses) not returning populated list, but lazy-loading

I am attempting to performance-tune a somewhat involved PowerShell script for some Active Directory management tasks. For example, I'm using $adUsers = GetADUser -Properties proxyAddresses (sometimes ...
1
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0answers
849 views

best configuration for 5k requests per second apache [duplicate]

I have a webserver which has 5k requests per second this overloads my server with the cpu usage host has 12 CPU and 8GB ram [ almost not in use ] my httpd-mpm configuration is below : <IfModule ...
2
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2answers
3k views

Hyper-V Windows Server 2016 VM is super slow

I have a Hyper-V VM, both host and VM are running Windows Server 2016. The VM has Exchange 2016 installed and takes an hour to start up fully (all Exchange services). It is actually very solid when up ...
2
votes
1answer
739 views

nfs server getting many rpc-srv/tcp: nfsd: sent only 700260 when sending 1048708 bytes - shutting down socket

System is running CentOS 7.3, serving files over both ethernet and infiniband, but the vast majority of traffic is over infiniband I just stood up a new file server that is now generating large ...
1
vote
2answers
350 views

Two identical systems with very different performance

I have two Dell R730 systems which have an identical hardware configuration purchased at the same time. Both are running RHEL6.9 where were imaged from the same image. It was imaged in January. I ...
0
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0answers
383 views

Apache uses 100% CPU but only part of RAM on heavy load

I am running a Website that gets heavy usage at a particular time. I run apache 2.4 on an EC2 Ubuntu 16.04 server with 4 Core CPU and 16GB of RAM and 2GB Swap. Size of the average apache process is ...
1
vote
1answer
75 views

Diagnosing slow/timing-out web application

I'm seeing average load times of load average: 12.41, 11.94, 11.59 on a linux-based machine serving a web application. It has 16 cores, so the load average isn't unmanageably high. However, this web ...
0
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1answer
404 views

MariaDB taking up 100-200% CPU

Server Specs RAM CPU STORAGE 80 GB 20 Cores 1536 GB SSD TRANSFER NETWORK IN NETWORK OUT 20 TB 40 Gbps 8000 Mbps This is the results from show status: ...
-1
votes
2answers
809 views

How much interrupts is too much?

On an AWS instance x1.32xlarge (128 cores), we are getting a lot of interrupts per seconds. Here are the top CPUs in interrupts/s: Interrupts Top CPUs CPU0: 140838.0 CPU1: 77867.0 CPU4: 66495.0 CPU6:...
0
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1answer
290 views

Very high load average results in server lag

We have a CentOS 6.9 server, with 4 core CPU and 32GB RAM. Everyday at around the same time the load average gradually changes from 0.0 upto 11 when we finally have to restart the server. CPU: ...
0
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0answers
81 views

Cannot get performance improvement with Haproxy

I have 4 web servers with a ruby web server running, and a server running haproxy. I can get a RPS(request per second) of 300 against one web server using ab. But I can only get a RPS of 340 against ...
0
votes
1answer
150 views

Backuppc performance dropped dramatically

I've got a tiny server in my house which I use for file server and hosting test web sites for my clients, among other things. It uses backuppc for backups. The machine is a MSI Cubi N, backing up to a ...
0
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0answers
460 views

How to scale my NGINX/Jetty (Spring boot) > 130 requests per scond?

I'm trying to increase the performance of my blog. It's not a standard wordpress/PHP blog, I've built it all my self from scratch using Java. I have a spring boot front end which talks to a ...
0
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1answer
37 views

What constant throughput and linear respone time tells about the system?

What does it mean when throughput in the system is constant and only response time changes (linearly)? Does it mean that I have to have a bottleneck?
0
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0answers
374 views

choosing a stripe size and allocation size for RAID 5?

I am trying to figure out what stripe size and also allocation size I should use for my RAID 5 setup. we got (6) 2 TB drives in a RAID 5, cost was the biggest factor of all. but I am confused on how ...
0
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1answer
716 views

How to create a non-caching fast nginx reverse-proxy?

Nginx should be fast - at least people say so. I can't get nginx fast. For benchmarking, i use siege in multiple configurations for simulating high loads. So i tried to load-balance a single server (...
3
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1answer
572 views

Slow SSD performance - IBM X3650 M4 (7915)

I set up a test environment for development purposes. It consists of a IBM X3650 M4 (7915) server with: 2 x Intel Xeon E2690 @ 2.90GHz 96GB 1333MHz ECC RAM 2 x HDD 146GB 15k rpm 6 x SSD 525GB (...
0
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1answer
1k views

How increase write speed of raid1 mdadm?

CentOS, Xeon 1230, 16 Gb RAM, 2x1TB SSD in raid1 (mdadm). Read from raid1 vary from 130 to 250 MB/s depends of files etc. But write speed very slow: 15-20 MB/s (iotop, mc etc.)! You know the real ...
1
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2answers
164 views

What performance statistics can I use to determine if hyperthreading will improve performance?

There are several questions asking if disabling hyperthreading will improve performance (e.g. like this). The answer (as it is to all performance questions) is of course "profile it on your workload"....
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0answers
284 views

Low NIC throughtput under Hyper-V

I have a Xeon-based Dell T20 with Quad Intel I350 running Windows Server 2016 Hyper-V with OpenSUSE as Gen2 VM. Both Windows Server and OpenSUSE have dedicated ports on I350, no sharing. SR-IOV is ...
3
votes
2answers
69 views

Tuning an email backup dataset on ZFS

I have a folder full of email back-up files (from offlineimap). One such folder has 87k files, of which 68k are between 512-1024 bytes in size. (This one folder is pretty representative of the rest.) ...
0
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0answers
78 views

The used heap memory keeps on increasing on managed servers even though the load test has ended, what could be the reason?

We are having a strange observation while performance testing our web application which is, even after the load test ends, the heap keeps on increasing, what could be the issue? The environment for PT ...
0
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0answers
438 views

MySql High CPU Low memory utilization

I am facing an issue with MySQL server. I am not a primary DB admin, so i might need some assistance in tuning DB. The CPU Utilization shoots up way beyond expectations. It just hovers around 70-90% ...
0
votes
1answer
76 views

Two identical servers. One with extremely poor performance

I have these two servers with the following specs: OS: RHEL 6.3 Hardware: Dell PowerEdge R610, 12 cores, 64GB RAM Drives: 6 x Samsung 840 Pro SSD RAID controller: Intel RS25AB080, 1GB Cache RAID ...
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0answers
110 views

Tuning a LAMP server

I'm trying to load test a LAMP application that my team developed and deployed on AWS ubuntu 14.04 using jmeter. We are using AWS CDN to serve static files, mysql and apache are on the same host. ...
0
votes
1answer
307 views

Why is Haproxy hitting (variable) connection limits?

I'm trying to understand some numbers I'm seeing as well as why Haproxy seems to be hitting variable limits on requests/s. The test set up is pretty straightforward: 20 backend servers running on ...
0
votes
1answer
681 views

How to tune apache with mpm_event

regarding apache tuning, there are lots of good documents and posts on the web eg. How To Tune Apache on Ubuntu 14.04 Server unfortunately almost all of them describe how to tune apache with ...
4
votes
2answers
1k views

Stand alone single thread optimized server vs vm running on VMWare

I apologize for the length of my post. We recently converted our business system to a product that is licensed by the number of Cores. We purchased the 2 core license and are currently running it on ...
1
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0answers
111 views

How are cluster size, buffer size and packet size related for performance?

I'm creating a server on an embedded system. I have a FAT filesystem on an SD card which contains a file, which should be sent via HTTP to some client over wifi that connects to the system. At first ...
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votes
2answers
72 views

libvirt: guest performance during backup

Here is a simplified version of my backup script that runs in the host: # shutdown the guest to ensure its filesystem is in a stable state virsh shutdown web --mode=acpi sleep 20s # the real script ...
1
vote
1answer
75 views

Ready to be used solutions for high performance FTPS and SFTP servers [closed]

In the performance phase of an enterprise secure file transfer application we figured out that the bottleneck of the stress tests is the partner machine (the application using FTP or SSH transfers ...
1
vote
1answer
512 views

Zabbix : How to acheive 1s interval with active items?

Is it even possible/recommended ? We are trying to set up few active items configured with a 1 second interval. However those items don't keep up the desired interval, instead we are gathering a ...
0
votes
1answer
119 views

Hunting for performance-reducing issues on a high-usage server

I host a server through the Google Compute Engine for various purposes, most notably a Minecraft server, and it receives a lot of traffic and usage. We're talking fairly constant CPU usage at 150%, 50 ...
1
vote
0answers
130 views

Optimize Apache serving as backend behind Nginx

Apache (2.4.x) is a well known server and performance optimization is widely discussed and well documented. Nevertheless, for those cases where Apache is reverse proxied (behind Nginx or other any ...