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Questions tagged [memory]

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

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Why is screen using lots of memory over time?

From time to time I find that a Digitalocean server gets slower, had low memory... $ free -h total used free shared buff/cache available Mem: 985M ...
NoBugs's user avatar
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1 vote
0 answers
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Is RAM bad when memtester reports errors but memtest86+ does not

I'm trying to troubleshoot my machine hangs/freezes, the machine is Intel i7-13700 CPU based with 64G RAM, running Debian 12. I was running memtester with various memory sizes (up to 60G), it ...
mehturt's user avatar
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How to proceed with "page file usage is above 80%" warning?

I'll preface this with the fact that I am a software developer by trade who has been impressed into the role of server admin. We have a server with Windows Server 2016 with these settings: ...
Scott Mitchell's user avatar
1 vote
1 answer
91 views

Discrepancy between kubernetes node memory stats and system memory usage

Kubernetes spits memory limit warnings at me, even though the memory of the node is not exhausted in any measure - neither by kubernetes stastics and even less by system statistics: root@ftt:local-...
xeruf's user avatar
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0 answers
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Understanding Netdata Warnings/Report

We're getting constant Swap memory Utilization warnings between 70% to even 100%, we have about 7 - 8 applications on this VPS which is deployed on Linode through Runcloud. This isn't happening on any ...
Thor Solutions's user avatar
2 votes
1 answer
118 views

What’s different between PC-5300E, PC-5300F and PC-5300P memory RAM?

I recently found out that there are many types of memory on PC servers. I see there is RAM memory that says PC-5300E, PC-5300F, PC-5300P, and there is also buffered and fully buffered memory. What ...
Koko Dwi's user avatar
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1 answer
92 views

ProLiant DL380 Gen10 - Memory Configuration

We have a "ProLiant DL380 Gen10" with 2 x "Intel(R) Xeon(R) Gold 5217 CPU @ 3.00GHz". Currently, each side of the CPU has 2 x 32GB RAM on "DIMM 8" and "DIMM 10",...
Nelson IOH's user avatar
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45 views

/proc/iomem shows multiple memory maps

Greetings! We have a single Intel NIC card attached that lspci lists as below and NIC driver is 'ixgbe'. The /proc/iomem shows multiple memory mapped for ther driver ixgbe, 81:00.0, and 81:00.1. I ...
Rama's user avatar
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1 answer
219 views

Unidentified RAM

Greetings! A server which is equipped with 512GB RAM(16 slots * 32GB) which OS is Ubuntu 22.04. During boot up, server reserving 16259356K(15GB) RAM showed in dmesg that resulted only 498GB is ...
Rama's user avatar
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1 answer
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sql server max memory change event viewer log

In the Windows Event Viewer application, I see a record that the maximum memory value of SQL Server is reduced by 99%. After this process, we could not access the database from anywhere. How can we ...
Kadir Çolak's user avatar
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207 views

Nginx Fails To Start After Update To 1.25.4 - could not build optimal server_names_hash, then zero size shared memory zone "one"

I just updated nginx to 1.25.4 on one of my Ubuntu Linux 20.04.6 servers and it is now failing to start. Errors I am getting are as follows: 2024/03/07 12:46:28 [warn] 29836#29836: could not build ...
svet0slav's user avatar
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1 answer
135 views

what is the link between SAR memory output and free command?

I now understand a bit more RAM usage in linux OS and I knwo that I can use free -h to have correct knowledge about RAM utilization in my server. but I also have SAR that is working on my server and I ...
iostrym's user avatar
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-1 votes
2 answers
94 views

Cisco RAM DDR3-16GB on Dell Poweredge R620 [closed]

Will this particular RAM - Cisco UCS-MR-1X162RZ-A 16GB DDR3-1866-MHz RDIMM/PC3-14900 (RAM DDR3-16GB) work with Dell PowerEdge R620?
walkomar's user avatar
2 votes
3 answers
828 views

MariaDB using more memory than expected

We're running MariaDB server 10.6.16 from the RPM repository https://mirror.mariadb.org/yum/10.6/rhel9-amd64/ on a AlmaLinux 9.3 system with 48 GiB memory (no swap space) and 32 CPU cores. We're ...
stepping stone AG's user avatar
1 vote
4 answers
709 views

How to monitor RAM consumption on Red Hat 7.9

Red Hat 7.9 server with 512 GB RAM. We often have alerts about swap being full. Swap is often used 99%. Our server admin told us it is normal for linux to have swap used 100%. There is no way to check ...
iostrym's user avatar
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1 vote
1 answer
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3/12 memory slots don't work - Dead processor or motherboard

I have a Dell PowerEdge M630 blade with 2x Xeon E5-2630 v4 processors which support quad-channel memory. The blade supports 24 sticks of RAM, 12 for each processor, 4 channels of three slots. I added ...
yakatz's user avatar
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0 answers
477 views

Proxmox high RAM usage

I'm currently running a Proxmox PC with 16GB of RAM. This system hosts 2 VMs and 1 LXC. VM-1: This VM is allocated 6GB of RAM and runs Jellyfin along with other ARR projects. VM-2: This VM is ...
Arshad Mahmud's user avatar
0 votes
1 answer
125 views

ESXi 6.5 - Guest Mem% doesnt match with Guest Resource Monitor memmory usage inside VMs

I have strange issue with ESXi Host : in preview of VM, it shows not valid Memmory usage informations when compared to Resource monitor inside Guest OS, as example : VM name Assigned memory / ESXi ...
Jozef's user avatar
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1 vote
1 answer
427 views

Discover process that exhausted my memory and CPU limits on Ubuntu

I have a DigitalOcean droplet running Ubuntu 22.04.2 LTS (GNU/Linux 5.15.0-89-generic x86_64). My website went down at approximately Fri Dec 01 6:48 AM GMT. From var/log/apache2/access.log, I ...
Jaime Montoya's user avatar
1 vote
0 answers
78 views

Why are compact_stall increasing on a system with Transparent Hugetable defrag set to 'defer'?

We're running a reverse proxying application within docker that is very network intensive. Dockerd is occasionally allocating memory using madv_hugepage, and we've observed this sometimes causes ...
d1jt's user avatar
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0 votes
0 answers
64 views

How to change the batch size of pcp in linux kernel?

I increased the pcp->high via echo 8 > /proc/sys/vm/percpu_pagelist_fraction command, but the pcp->batch value still remains at 63. vm stats threshold: 125 cpu: 383 count: 103931 ...
Frontier_Setter's user avatar
2 votes
1 answer
2k views

Many segfaults, RAM failing?

I have a Proxmox installation that is unstable, both the host and LXC containers crash. I to find the fault I have tried swapping RAM, CPU and MB. I also did a fresh reinstall. But I'm still getting ...
Northern Brewer's user avatar
0 votes
0 answers
260 views

Memory mapped files filesystem access over NFS performance

I'm debugging a system that is accessing files on AWS EFS, where the EFS reaches is peak throughput because of IO operations. I noticed that the application is sometime reading memory mapped files in ...
yogi's user avatar
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0 votes
1 answer
4k views

KVM: qemu-system-x86_64: cannot set up guest memory 'pc.ram': Cannot allocate memory

When trying to start a VM (1GB allocated) I have run into memory allocation issue even though I have more than enough memory on the system (16GB): error: Failed to start domain exampleVM error: ...
LetMeSOThat4U's user avatar
0 votes
1 answer
468 views

Almalinux 9 Failed to allocate memory

I have SingleStore DB CLI (Cluster in a Box) deployed in a AWS EC2 Instance r6i.4xlarge with Almalinux 9 OS. At the moment of load data by pipelines the following error appears: line 34: ER_MEMSQL_OOM ...
Alexis Cruz's user avatar
0 votes
1 answer
2k views

MS Exchange 2016 and high memory usage

Our MS Exchange 2016 instalation has a high memory usage in store worker and sometines this stop to receive then email from another server. What may be wrong in our instalation?
mardon's user avatar
  • 241
6 votes
1 answer
632 views

Does Windows zero out the memory pool after a driver frees it?

I am researching the possibility of overcommitting memory on a host where many Windows servers are running. The virtual machines are QEMU/KVM backed and managed by Libvirt. My current observation is ...
jshen28's user avatar
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5 votes
1 answer
114 views

PowerEdge FX2s ram types

I have a PowerEdge FX2s modular server with two PowerEdge FC630 Blades. Does the RAM type in both blades need to be identical in terms of: 2133P / 2400T ? Ranks ? Module sizes symmetry ? I am new in ...
Rony_Ecology's user avatar
1 vote
1 answer
279 views

Memory consumption on virtual server too large for applications being run

I have a Linux Ubuntu virtual server at Digital Ocean with the following specs: 1 vCPU, 2GB of memory, and 25GB of SSD storage. The server is running a single WordPress website with around 400 unique ...
Mike Hermary's user avatar
3 votes
1 answer
789 views

What granularity does memory channel interleaving occur when enabled in BIOS?

Memory channel interleaving is a method of setting a physical address area which can be enabled in BIOS, so that all memory channels are alternately used to achieve best bandwidth and latency. I want ...
Frontier_Setter's user avatar
0 votes
0 answers
254 views

stressapptest shows FAIL result but memtest86 can't detect any error

I have a question about DIMM test (stressapptest and memtest86). I am using AMD Threadripper with 4x16GB Samsung ECC memory. stressapptest obviously designates there is something problem and this is ...
freeyssu's user avatar
0 votes
0 answers
322 views

systemd show the maximum memory a .service has used

I can see the current memory usage of a systemd service with systemctl show -p MemoryCurrent update-data.service (after I've set MemoryAccounting=yes). Is there anyway to see, from systemd, the ...
Amandasaurus's user avatar
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5 votes
3 answers
3k views

What are the options to monitoring page cache usage?

In essence the Page Cache is a part of Virtual File System (VFS) which main purpose, as you can guess, is improving IO latency of read and write operations. In computing, a page cache, sometimes also ...
King David's user avatar
0 votes
0 answers
194 views

production kafka clusters + How to optimize Page Cache

one of the importance things in Kafka production cluster is the page cache here is a good explains what is page cache PageCache is a typical read/write cache. The operating system uses the free ...
King David's user avatar
0 votes
1 answer
737 views

which memory limit applies when php performs a MySQL query

If I run php as FPM, I can set my memory limit in php.ini or .user.ini. PHP can perform a MySQL query, and I can set memory limits in /etc/my.cnf for for instance the innodb buffer pool. If PHP runs ...
Guido Goluke's user avatar
0 votes
1 answer
493 views

MCE Errors but no edac-util errors?

I have an older HP Z440 tower with 4x8GB ECC DDR4, running Proxmox VE 6.4. Recently, it started showing MCE errors every few seconds. I installed rasdaemon and can see that they are memory read errors....
Dustin Lewis's user avatar
0 votes
1 answer
284 views

kernel messages are complained about memory.inspite all DIMM cards was replaced

we have few DELL machines ( with RHEL 7.6) , and as we replaced the DIMM cards on machines because the Erros that we seen from kernel messages after some time we checked again the kernel messages and ...
King David's user avatar
0 votes
0 answers
783 views

ECC DDR5: EC8 (80-bit) vs EC4 (72-bit) data integrity capabilities?

I have been looking info about ECC on DDR5 DIMMs (full ECC, non on-die ECC) and I have seen that there are two different types: EC4, which uses 4 ECC bits per subchannel, for a total of 72 bits width ...
Héctor's user avatar
  • 141
0 votes
1 answer
37 views

Persistent Memory Redundancy?

This is the first time I've really dug into PMMs (Intel Optane), so bear with me if I'm a little slow on the uptake.  It looks like you can configure these in either cache- or disk-mode, depending on ...
Mike Texter's user avatar
1 vote
1 answer
881 views

What does lower case "g" mean in top output?

Can someone please help explain this, I have always used to interprete the "g" in top output to be size in Gigabytes even though the convention is to use uppercase "G" but now I am ...
AguThadeus's user avatar
0 votes
1 answer
312 views

Process with very high RAM usage takes very long to stop using force stop in Task Manager

We have a Windows Server 2016 with around physical 700GB RAM. A colleague of mine ran a machine learning script in Matlab, that loaded 25GB of data in RAM and during the training the RAM usage ...
rbaleksandar's user avatar
0 votes
1 answer
744 views

Dell R720 Memory Configuration [closed]

I have an R720 with 2x E5-2650 v2, 8x8Gb Single Rank RDIMMs and 8x8Gb Dual Rank RDIMMs. I´m not sure how to install the DIMMs I´ve read that single ranks are faster than dual ranks so should I ...
user avatar
1 vote
0 answers
128 views

High RAM usage when providing large file on apache

I'm using Apache 2.4 on AlmaLinux 8. When I publicate a hundreds GB file and if someone starts downloading it, Apache RAM usage (especially VIRT) becomes bigger and bigger, starts swapping and ...
NON's user avatar
  • 23
0 votes
1 answer
424 views

Hyper-V VM wont start with more the 22gb RAM and produces Error Code 0x80070070

Currently got a server with 512GB of RAM and want to allocate 22GB of RAM to VM's on Hyper-V, currently have three machines, two with 22GB and one with 24GB RAM and are working fine but the fourth VM ...
Nik's user avatar
  • 11
0 votes
1 answer
442 views

Clear RAM Memory Cache and buffer on production Hadoop cluster with HDFS filesystem

we have Hadoop cluster with 265 Linux RHEL machines. from total 265 machines, we have 230 data nodes machines with HDFS filesystem. total memory on each data-node is 128G and we run many spark ...
King David's user avatar
1 vote
1 answer
384 views

Linux: How to check total number of bytes written to memory by a process

Note: I know about the commands like top but I am interested in knowing the number of bytes written to memory and also rewrites (number of times storing to the memory happened)
NUPUR AGRAWAL's user avatar
0 votes
1 answer
677 views

kernel message + how to know if we need to replace the DIMM based on kernel messages

we have RHEL 7.6 server , and we noticed about the following kernel messages. [1065085.048872] EDAC sbridge MC0: PROCESSOR 0:406f1 TIME 1676989040 SOCKET 0 APIC 0 [1065086.052107] EDAC MC1: 0 CE ...
King David's user avatar
1 vote
1 answer
1k views

How to test Linux server for hardware errors?

I have a Debian 10 server that is randomly rebooting, though no error were written to journald. The server has rebooted 20 times in last 3 days. $ journalctl --list-boots -22 ...
Tombart's user avatar
  • 2,253
1 vote
1 answer
1k views

Is it safe to set RAM frequency beyond Intel's POR?

Memory in our SuperMicro servers runs on a somewhat lower frequency than it could and it seems to be artificially limited by the Enforce POR BIOS setting. SuperMicro warns on their website that "...
Ondra Simek's user avatar
3 votes
1 answer
2k views

How could I limit memory and cpu usage in Docker globally

I'm using Docker with Ubuntu in a development environment, but I noticed that docker can use all the resources of the host machine, is there any way I can limit this without having to configure each ...
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