Questions tagged [memory]

Synonym for: RAM - Acronym for: Random Access Memory, a type of computer data storage.

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Can't track memory usage of MySQL docker container

I have a MySQL instance as a docker container managed by Hashicorp Nomad on an AWS EC2 t4g.small instance. I need to monitor MySQL's memory usage because I have experienced OOM kills after ...
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Latency of memory accesses via interconnectors

I'm trying to compare latencies of different node interconnects for a cluster. The goal is to minimize the memory access latency. I have obtained some benchmarks regarding one of the hardware ...
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How do i schedule the built-in windows memory diagnostics from a server core installation?

How do i schedule the built-in windows memory diagnostics from a server core installation? mdsched.exe does not seem to be included in Server Core 2019
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enough free pages but high number of major page faults and page reclaimation

We find that for some servers io disk read is very high. We also notice that there are many major page faults on those servers. But we checked the /proc/zoneinfo, there are enough free pages. Here is ...
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HP Proliant DL120 G6 Memory issue

I bought new RAM for my DL120 G6, but with it installed it does not boot. I thought it might be incompatible so I bought another batch of memory but same result. I get no display output and no ...
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PowerEdge R440 Mixed Memory configuration

I have one Dell PowerEdge R440 The server has 12 DIMM: 32GB 2Rx4PC4-266V-RB2-12(HMA84GR7JJR4N-VK) [A6]-[A5]-[A10]-[A4]-[A9]---CPU0---[A7]-[A1]-[A8]-[A2]-[A3] 32Gb 32Gb 32Gb ...
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Why cannot use buff/cache?

It seems mysqld allocates too much memory as buff/cache: free -m total used free shared buff/cache available Mem: 990 448 96 36 ...
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70 views

disk read io very high, but no process perform io read

We have experienced a very strange problem. The load of the server machine is very high due to high disk read io. But the processes running on this server do not perform any disk read operation. We ...
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How do the filepaths work for websites with multiple storage drivers/servers?

So I am developing this site on my localhost and currently when I 'upload' a file, I have set the file to be stored in an uploads folder, with sub-folders being generated consisting of the first 2 ...
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Changing the RAM of lenovo workstaion from 8GB stick to 32GB

I have Lenevo P700 It supports this memory . This is ram which is currently inside https://postimg.cc/Ny2WQR8w THis is what i find from google it supports 32GB https://www.compuram.biz/memory/lenovo/...
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Memory module error affected OS performance

One day, one of the memory modules started producing correctable memory errors. Then, the operating system began to slow down, and the Oracle database stopped working correctly. Also, I don't use ...
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519 views

Is it possible to set vm.overcommit_memory =1 only for specific containers?

So, I'm running a container that is showing this in the log: WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = ...
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809 views

Proxmox kills VM when RAM usage grows

I don't know if this stackexchange site is the most suited to my question, please flag this for mods to move the question elsewhere if it isn't. Context & issue I installed Proxmox on a physical ...
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Reducing PostgreSQL memory consumption

PostgreSQL chews up 4 GB on 500 concurrent connections? I need to get it below 2 GB, or i have to get a more expensive server :( Tried: temp_buffers = 800kB work_mem = 1MB max_stack_depth = 1MB
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unusually high memory consumption by the kernel

I have an issue with some of my VMs. They are used as workstations for our designers, and run Centos 6.10. After a month of use, they seem to run out of memory for some reason. > free -m ...
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How to enable more than 4 GB in SQL Server X86 under Windows X64

I have read here that I can use more than 4 GB in X86 SQL Server Systems and X86 Windows servers via /PAE option, but my scenario is different. I have a 32 bit SQL Server std in a Windows 2019 X64 std ...
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Where is my memory being consumed? [duplicate]

I have a Ubuntu 20.04 server which is reporting relatively low free RAM: top - 11:28:31 up 5 days, 20:12, 3 users, load average: 0.18, 0.26, 0.27 Tasks: 268 total, 1 running, 267 sleeping, 0 ...
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Windows 2016 rebooting randomly bugcheck dump file

Windows 2016 server reboots randomly, about once a week. Any ideas? here is the memory dump log Bugcheck Analysis * * ...
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What power rail (12, 5 etc) powers RDIMM memory

TLDR: is RDIMM memory powered by 12v 5v or 3.3v rails from standard 24-pin 2-EPS ATX PSUs? I understand this could vary by manufacturer, but on my Super Micro EATX motherboard I am attempting to power ...
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confused about buff/cache and available memory metrics

I'm totally confused about the memory metrics provided by free command in linux. currently I receive the following metrics: total used free shared buff/cache ...
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Does add more memory RAM decrease I/O wait?

My server is Ubuntu KVM and has 2 cores, 4GB RAM, and I use HDD, at moment I can't swap HDD to SSD. I found this answear (https://unix.stackexchange.com/a/463819/351968) saying that adding more memory ...
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How to check that docker-compose did resource allocation

I'm trying to allocate resources inside docker-compose: version: '3' services: db: # omitted for brevity my-service: image: my-image restart: always ports: - "8080:8080&...
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Application specific system tuning

I'm running an application under wine (Navico insight map creator) on multiple machines and am in the process of benchmarking and optimizing the performance of this process. I find the following ...
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42GB of Free RAM but process exits after using only 27GB

RAM is not completely utilized while a process is running in Solaris SPARC 11. I have around 42GB of Free RAM of the allocated 50GB of RAM on the server and every time the process exits after ...
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Difficulties testing memory on HP Proliant DL380 gen8 dual CPU

I suspect I can't see the wood for the trees but I am having massive issues trying to test the memory on an HP Proliant DL380 gen8 system and I need help! When I use an Ubuntu 20.04 install, boot Grub ...
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What could cause kswapd to reclaim tens of GBs of file cache on a postgres machine?

Usually the size of the file cache on our managed postgres machine running in GCP is between 110GB and 120GB. Sometimes it drops by ~35GB then oscillates by 10GB for an hour or two before slowly ...
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525 views

Mysql filling all the buff/cache memory

The more time the server run, the more buff/cache Mysql processes use, i'm at 95% right now and only a server reboot free the buff/cache memory. None of the mysql commands free it on the go. Is it a ...
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SSD I/O slows down system

My HDD was getting full, so I added a new SSD and tried moving files to it. For some reason, this bogs down the whole system to the point where it's not usable. This never happened with HDDs when ...
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Messagebus is using more than 4 GB RAM

I have just checked my Server and it is running relativly low on RAM. There are currently no users on anyone of the Services Installed (Jitsi, Rocket.Chat, OnlyOffice Workspace) as they're all still ...
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Is it possible to dump memory from one Ubuntu VM to another?

I'm trying to use Azure VMs to host a game server for me and some friends since spot instances are cheap, but the downside is that they get deallocated/deleted pretty quickly in practice (somewhere ...
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What contributes to memory “usage” in the OOM killer output in kernel 5.4

This is one of recent OOMs I've captured Nov 3 03:00:24 node kernel: [ 457.525768] memory: usage 98304kB, limit 98304kB, failcnt 0 Nov 3 03:00:24 node kernel: [ 457.525769] memory+swap: usage ...
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How much physical RAM is “lost” to BIOS/UEFI?

Browsing the linux kernel output dmesg on 6 different systems (4 server, and for the sake of comparison also 2 laptops) I am shocked by the large amount of BIOS/UEFI reserved RAM Three servers systems ...
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HP DL380p G8 Populating the RAM

I bought a DL380p with 168GB, was working fine until it came up with a DIMM error on the front panel. I wrongly thought I could just move the ram to a different slot. Now I can only get it working ...
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Reading the munin memory tab

I have Munin on my CentOS server and mostly use it to see server load, apache access's mysql queries. I wanted to look at the memory tab and i wonder how do i "read" it? t's not the same as ...
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1answer
122 views

Swap being used when not necessary

I have: vm.swappiness = 1 as suggested here to prevent using Swap when there is plenty of available memory. (0 would completely disable swap, as far as I understand) In frequent cases, I end up with, ...
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34 views

weird filesystem behavior (corruption?)

Something very weird I came across, any thoughts would be much appreciated: Some software (httrack) created a directory structure. Using my user (which also ran the software), I cannot view the ...
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1answer
136 views

fio 3.23 core dumps when bench-marking many small files

I have been asked to come up fio benchmark results for this test dataset: 1048576x1MiB. So, overall size is 1TiB. The set contains 2^20 1MiB files. The server runs CentOS Linux release 7.8.2003 (Core)...
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64 views

AnonPage memory leak

Our service notices some hosts having large anon pages like these from pmap -x: 0000000580000000 9486088 9479172 9479172 rw--- [ anon ] meanwhile, our other regular hosts have much smaller anon ...
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Memory usage doesn't add up: most of the RAM gone mysteriously

I have a Fedora 30 [5.6.13-100.fc30.x86_64] machine with 32GB of RAM onboard. Right after boot both free -h and htop indicate that 21-22GB is used: [ andriim@dev-r-vrt-007 ~/work ] $ free -h ...
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278 views

kdump not saving to /var/crash on Centos 8.1 server

I am trying to test the kernel dump using echo 1 > /proc/sys/kernel/sysrq ; echo c > /proc/sysrq-trigger command. On some servers, I can get the dump and on some servers I don't see anything. ...
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What is the best mysql configuration for mysql instance with a lot of databases and lot of tables inside?

I have a mysql database instance with more than 3000 database inside. Each database contains more than 200 tables. I have more than 100 gb of data in all these database at present. I am using windows ...
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At which allocated RAM does AWS Lambda change the instance size?

I have a Flask api running on AWS Lambda. When i increase the allocated RAM to the function the response time decreases, which is of course good. But that also means that the "instance size" ...
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1answer
80 views

Which one is the cache value in the output of top?

On the book I'm reading, DevOps Troubleshooting, it says that the last value in the swap line is the memory used for file caches (yellow) in Linux so subtracting it to the used memory (green) gives ...
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471 views

Memory Ballooning in Linux/Unix on VMware ESXi

I need help to reclaim the ballooned memory in a Linux/Unix machine. Please help me out. I found some solutions but they are not feasible for me on the production server. I just need to know how can I ...
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Minecraft server constantly crashing [closed]

I tried to make a VM instance on the Google cloud platform for my Minecraft server. But It's constantly crashing after a few hours. It says that I don't have enough memory but I think I allocated more ...
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750 views

How to test RAM if memtest86 freezes?

I suspect some faulty RAM and wanted to test it with Memtest86. I'm using a bootable Ubuntu 20.04 USB stick and choose the "Memtest" option from the boot menu. Unfortunately the test freezes ...
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558 views

High IO rate when system out of memory

I found that when the system goes out of memory, the disk IO usage will be very high. It seems many processes are reading from hard disk frantically (check htop output below). When I kill a process ...
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Why solaris doesn't see all the DIMMS installed?

This is a SPARC T4-2 Server. It has installed 128GB memory in 16 DIMMS 8GB each. The prtdiag -v output shows ======================= Physical Memory Configuration ======================== Segment ...
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Windows 10 Memory Leak (>4GB) - Tags (poolmon) IO and RaWl - Unkown Stack (N/A)

I have a problem with a memory leak on Windows 2019 Server. With the help of several descriptions here, I have already done the following: using Poolmon to analyze the memory make a trace using xperf ...
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1answer
262 views

Server performance upgrade for 500 users [duplicate]

I have an application(Moodle platform) with 50 users. The actual performances of the server are: RAM is 2 GB Storage is 10 GB CPU is AMD 2.1 GHz with 2 Core The server is hosted in amazon, instance ...

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