Questions tagged [memory]
Synonym for: RAM - Acronym for: Random Access Memory, a type of computer data storage.
2,031
questions
0
votes
0
answers
6
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 ...
- 79
0
votes
0
answers
68
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 ...
- 101
1
vote
0
answers
24
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 ...
- 11
-1
votes
0
answers
19
views
Win 11: Pagefile disabled but virtual memory still exists [migrated]
On Windows 11 system, I disabled pagefile. Subsequently, 'Performance Options' shows 'Total paging file size for all drives: 0MB'. However, the virtual memory is still not set to zero and affects the ...
- 123
-1
votes
0
answers
30
views
What are the kinds of server workloads where LRDIMMs are better to avoid?
Reading articles like this and this, I started wondering if there is a more clear and simplified description on which "high speed and low latency" kinds of workloads LRDIMMs would not be ...
- 119
0
votes
0
answers
23
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
...
- 139
2
votes
1
answer
564
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 ...
0
votes
0
answers
77
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 ...
- 101
0
votes
1
answer
906
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: ...
- 1,401
0
votes
1
answer
183
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 ...
0
votes
1
answer
404
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?
- 243
6
votes
1
answer
589
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 ...
- 81
5
votes
1
answer
107
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 ...
- 51
1
vote
1
answer
146
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 ...
- 141
3
votes
1
answer
354
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 ...
- 139
0
votes
0
answers
130
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 ...
- 1
0
votes
0
answers
97
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 ...
- 31.9k
4
votes
3
answers
1k
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 ...
- 559
0
votes
0
answers
116
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 ...
- 559
0
votes
0
answers
20
views
Large consumption of resources when stopping Apache
During the stop of the apache service, the httpd -prefork processes take 100% load on all cores and take up all available memory, as a result of which the oom killer is triggered.
Stop command:
...
0
votes
1
answer
353
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 ...
- 95
0
votes
0
answers
237
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....
0
votes
1
answer
110
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 ...
- 559
0
votes
0
answers
479
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
...
- 141
0
votes
1
answer
31
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 ...
- 93
0
votes
1
answer
338
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 ...
- 103
0
votes
1
answer
154
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 ...
- 113
0
votes
1
answer
418
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 ...
user1013640
0
votes
0
answers
257
views
How to troubleshoot multiple services and applications crashing at the same time?
Our application is run on multiple VMs (isolated instances). It comprises of a few services and ASP.NET website. This issue is happening on almost all of them to some degree.
It was found that the ...
1
vote
0
answers
85
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 ...
- 23
0
votes
1
answer
132
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 ...
- 11
0
votes
0
answers
24
views
Server randomly shutsdown and blows fan at full speed with no video output
Cross-posting this from superuser because they suggested it might get a better response here
Specs
Model: HP Z230
CPU: Intel Xeon e3 1230 v3
RAM: 1x8GB DDR3 Non-ECC RAM
GPU: Radeon HD 8570
NIC: Intel ...
- 109
0
votes
1
answer
235
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 ...
- 559
1
vote
0
answers
76
views
How can I approach system-wide, per-process resource monitoring on Windows Server 2016 Datacenter?
Context: My team hosts multiple applications on a Windows Server 2016 box. For planning purposes, I'm interested in profiling CPU and RAM usage per application over time. Most of these apps are .NET ...
BobRz
1
vote
1
answer
201
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)
0
votes
1
answer
453
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 ...
- 559
0
votes
0
answers
301
views
why SUnreclaim in slab cache grow extremely high but can be greatly free up through drop_caches?
We observe extremely high slab memory usage on a long running CentOS7(mount Lustre) server. With total 187G RAM, the slab cache used 110+G and most part is SUnreclaim.
Since slab = SUnreclaim + ...
- 33
1
vote
1
answer
936
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 ...
- 2,163
1
vote
1
answer
556
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 "...
- 231
1
vote
1
answer
1k
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 ...
1
vote
0
answers
398
views
Linux: 100 Mi RAM free but no processes with high-memory usage
A Debian Bullseye server is using almost 100% RAM quantity (7.65G / 7.79 G):
But there are no processes with more than 0.0% memory usage
DEV root@postgres2 ~# free -h
total used ...
- 1,893
0
votes
0
answers
27
views
Measure Memory Requests to RAM (Linux)
How can I measure the number of requests per second issued (not MB/s) to RAM on Linux?
Background: DDR4-2933 purportedly can issue 2933.33 MT/s and I want to ensure a program completely saturates the ...
1
vote
0
answers
150
views
ESXI Linux Vm high memory usage but no process is using it
am facing a serious problem in our company server, we have Centos 7 machine on ESXI 7.0 with 26 GB of RAM, every week I have to reboot the VM to avoid full memory usage.
in the mean time I have 13 GB ...
- 11
0
votes
1
answer
64
views
Debian x64 limited to 4GB Memory- why?
I have a virtual machine (running on a QNAP NAS) which is configured for 8GB of memory. But my Debian only uses 4GB of them.
See outputs:
root@backuppc:/# lshw | grep "*-memory" -A 40
*-...
- 11
-1
votes
1
answer
215
views
sharing the memory of a program between ec2 instances [duplicate]
Is it possible to combine the memory of ec2 instances? For example, let's say that I run a program that requires 2gb ram to run on one ec2 with 1gb ram instance,
can I somehow share that program's ...
- 1
2
votes
1
answer
157
views
MariaDB - Contiunes to use more memory
We are running Maria DB 10.6.9 on CentOS and we are observing it continues to increase the usage of memory.
Server Specifications:
RAM - 128 GB
vCPUs - 48
Swap - 100 GB
We have configured ...
1
vote
1
answer
494
views
zram-generator doesn't create zram device
I try to used zram-generator to create a zram device but it doesn't work.
I followed the steps listed in the README.md from the github repository.
Install zram-generator using one of the methods ...
- 11
-1
votes
1
answer
81
views
Tier 1 OEM Grade Memory?
We need to buy some memory for some servers. I have three quotes in total. One for memory from dell, one for Kingston memory and one for Crucial/Micron memory.
The one for crucial memory and Kingston ...
- 619
0
votes
1
answer
179
views
Pink in memory htop
What does the pink color in memory htop means and how can I reset it?
You can see example here:
htop preview
0
votes
1
answer
436
views
node in docker in aws instance is running out of memory, why?
My NodeJS application is running inside a docker container on an ec2 instance.
It is running out of memory way before the server itself is running out of memory. The container is only able to use ...
- 103