Questions tagged [performance-tuning]

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

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Shingled magnetic recording(SMR) device managed - sequential write performance optimizations

recently (2020-05) many HDD producers were caught silently replacing CMR lines with SMR disks, which brought more exposure to the whole concept. It seems that most device-managed SMR disks first ...
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CPU C-states disabling ruins network performance

With intel_idle.max_cstate=1: root@debian:~# curl -o /dev/null http://xx.xx.38.35:999/speedtest/1000mb % Total % Received % Xferd Average Speed Time Time Time Current ...
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What can be a reason for different clock speeds between sockets on 2 x Xeon Scalable 6148?

I have server with dual Xeon Scalable 6148 CPUs running HPC application. Base clock: 2.4GHz All core Turbo: 3.1 GHz Some processing threads are not scaling well and are sensitive to cpu clock. I ...
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How to improve performance of Nginx for high PHP processing load?

I wonder how I could improve the performance of my server? It is configured with Ubuntu 18.04 (LTS), 4 GB RAM, 100 GB SSD, 2 CPU, with Nginx 1.14.0 and PHP 7.2-fpm to handle running and serving a site ...
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How to determine HugePages count?

I have a number of servers that we use as KVM hypervisor nodes. We want to enable hugepages and leverage this features for performance related matters. I have looked online on how to enable hugepages,...
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product import is broke behind cloudflare

Im having trouble to resolve my database errors and how to optimize it. Coz of the slowness of my server (mostly querries i believe), my imports turns with a cloudflare error code. (Cloudflare blocks ...
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Tweaking the SSL based VPN for high Throughput and low Latency

I'm having OpenVPN 2.3.8 (i686-w64-mingw32 [SSL (OpenSSL)] [LZO] [IPv6] built on Jul 3 2017) through a built in application product which will be connected via TCP instead of UDP client dev tun proto ...
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Index rollover latency

I have created an ILM policy as follows, { "policy": { "phases": { "hot": { "min_age": "0ms", "actions": { "rollover": { "max_docs": 30 }, ...
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Any ideas on tuning single stream tcp performance?

I'm a newbie to TCP tuning and would really like some pointers to possible solutions. I have a Ubuntu 18.04 server with maximum bandwidth of 30Mbps. But simple downloading like scp or wget can only ...
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692 views

Is there is any tool/way to find out why packet is getting dropped due to an arp cache full?

My developer hypothesis is packet is getting dropped at arp layer. We increased the default value of neigh.default.gc_thresh3 1024 --> 2048 and now everything looks good. But I want to understand is ...
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231 views

Bottleneck identification using iostat, vmstat, mpstat

I am doing some Apache and MySQL performance tests, then upgrading a single component and running tests again to see where the bottlenecks are. I have a local used server warehouse (Tams in Lindon UT) ...
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Does F5 HTTP/2 profile need tuning?

The current default for the F5 HTTP/2 profile has a Concurrent Streams Per Connection default of 10. This seems a bit conservative. IETF recommended that this value being no smaller than 100, so as to ...
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Maria Performance Tuning: HyperThreading is great for marketing, lousy for performance [closed]

I'm looking into optimizing my database server and this is what I read in Maria's official documentation here. How true is this? More so, how is this true? Apologies if this is not the best place ...
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DoS attack? Vast majority of apache workers in 'Reading Request' mode, site down last night, slow now

So I think my server might be suffering a Denial of Service attack. We got notified by pingdom (website monitoring) that our website was unavailable starting around 3AM. Early today we started ...
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Improving high IOWait and high load-averages on a “Tube” site

I manage a small'ish tube site with some paid videos for engineering folks. I have noticed that my CPU IOWait and Load Averages are quite high most of the time. I understand that it is normal for ...
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Apache on big server too low in performance (Cake PHP 1.3 web site), not using all the available resources

I have a "big" VM running apache 2.4.6-90, MPM Prefork, almost full dedicated to a web site programed in PHP 5.4.16 Cake 1.3 (yes, old...) that connects to a external dedicated Percona server. I ...
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Apache performance tuning for high traffic with MPM Event

I currently manage the following set of servers that serve about 700 web pages: SERVER 1 (WEB) Web server: Apache 2.4.29 with MPM Event PHP 7.2.22 CPU: Intel Xeon CPU E5-2673 v4 @2.30GHz (4 cores) ...
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Web-server takes long connection time from remote

We have setup a website back-end by HAPROXY+Apache2. It is publicly available (for testing). It is just like a news portal. Currently, there is very small traffic on the server (hosted locally) i.e., ...
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Possible reasons Distribution of durations is tri-modal

Below is the distribution graph of durations from a single page of an asp.net webforms application. As you can see there is a cluster of response times in the 250ms range, there is a cluster in the ...
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336 views

MySQL LOAD DATA INFILE: Better Server, Worse Performance

I am testing out Microsoft Azure Database for MySQL and have run into a performance issue that I do not understand. I launched a "Basic" server with 1 vCore (2 GB RAM, "Standard Storage"), which is ...
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current number of partitions of a DynamoDB table

The number of partitions is mostly dependent on WCU/RCU and amount of data. However, how can I check what's the current number of partitions (e.g. if one accidentally set the WCU too high for a short ...
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288 views

Packet drop on HP ProLiant DL360 G9 running RHEL 6.10

We have a HP ProLiant DL360 G9 running RHEL 6.10 with 2 X Intel 82599ES 10-Gigabit SFI/SFP+. HP product name is HP Ethernet 10Gb 2-port 560SFP+ Adapter eth5 and eth6 showing a lot of packet drop (...
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874 views

Serving a static website with nginx. Response time over 600 milliseconds. What’s wrong?

I serve a wordpress blog with nginx http cached to over 99% of the requests with a cache lifetime of 2 days. Here’s a webpage from the site. The webpages have quite a few images and therefore lazy ...
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690 views

What can be done increase bandwidth from Citrix XEN guest to Citrix XEN guest on the same physical host?

Guest VM to guest VM bandwidth on a single Citrix 7.6 XenServer host caps out at about .6Gbits/s using UDP and 6Gbits/sec using TCP. UDP performance over restricted shared memory does not reach ...
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836 views

how to reach 1M concurrent TCP connections?

I am trying to setup a environment with multiple nodes (1 receiver + 16 senders) to establish 1,000,000 (1M) concurrent TCP connections. Using this tool: https://github.com/Microsoft/ntttcp-for-linux ...
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50 views

Soak test failing on AWS RDS MySQL

I have a MySQL database in AWS RDS. It is an r4.large machine with 16GB ram. I have been testing its load capacity and find out that upto 18 concurrent users, the app works fine. Then we decided to do ...
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221 views

Apache Tuning for 512GB RAM

Use Case: API Server Cluster Optimized for JSON Data Submission I have a distributed application sending info to API servers that are slaves of a MySQL 8 master. Applications do full initial sync (~...
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189 views

Online performance tuning apache tomcat

I'm relatively new to this field and not sure whether I'm posting the question in the correct forum. I'm trying to do online parameter tuning for the TPC-W benchmark. (It is a 3-tier web application ...
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2answers
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How to ask antivirus software to work slower and hence use less disk access?

It is our policy for our end-user's computers (usually laptops) to have high power CPUs, GPUs, RAMs (no less than 16GB) and HDD space (1TB), but we save money by choosing lower rotation speed of HDD. ...
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Options for performance improvements on very big Filesystems and high IOWAIT

I have a Ubuntu 16.04 Backup Server with 8x10TB HDD via a SATA 3.0 Backplane. The 8 Harddisks are assembled to a RAID6, an EXT4 Filesystem is in use. This Filesystem stores a huge amount of small ...
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Is it possible for Windows clients to carry out external queries through an alternative DNS server directly?

Our Windows domain is far away. DNS performance is affected. Would it be possible for Windows clients to carry out external queries through an alternative DNS server directly? I understand this is not ...
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303 views

Debugging and fine-tuning the linux process scheduler

When debugging sporadic web application slowdowns, I've found that all the processes have quite high maximum scheduling delay. # perf sched record -- sleep 10 && perf sched latency --sort max ...
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817 views

Nginx: Optimizing server response time for a HTTP cached website

I have a website with all of the pages served from nginx’s http cache and rarely invalidated or expired. The average total page download size is around 2 MB But despite being a static site with no ...
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108 views

Nginx performance issues with single user reqesting but with large configuration file

I have following configuration used in server block and as the number of locations grew, the performance has degraded substantially even if there is only one request (e.g. https://example.com/loc1/...
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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 ...
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1k 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 ...
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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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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 ...
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1k 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 ...
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474 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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337 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). ...
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1k 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 ...
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468 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 ...
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389 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 ...
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3k 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 ...
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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 ...
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1answer
3k 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 ...
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540 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 ...
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594 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 ...
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102 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 ...

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