Questions tagged [memory]

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

Filter by
Sorted by
Tagged with
0 votes
1 answer
278 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 ...
0 votes
1 answer
27 views

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 ...
3 votes
0 answers
36 views

Linux ate my RAM [migrated]

I know this seems like a duplicate of many other posts in here, but I beg to differ. as this (to my not very experienced eyes) doesn't seem to be a caching problem. We have a server with 256G of RAM, ...
-1 votes
1 answer
36 views

Supermicro X7DCA-L memory errors when installing new ram [closed]

I'm hoping that someone may be able to shed a bit of light on this for me. I recently picked up a used supermicro server to use as part of my development workflow. When I picked it up, it had 8GB of ...
3 votes
2 answers
4k views

Slab reclaimable memory is not freed when needed

Correct me if I am wrong, but to my understanding slab reclaimable holds cached kernel objects which can be freed if needed. So if application needs to allocate more space, even if the 'free' memory ...
32 votes
11 answers
21k views

To improve SQL performance, why not just put lots of RAM rather than having faster hard disks?

People keep telling me that in order to improve an SQL server's performance, buy the fastest hard disks possible with RAID 5, etc. So I was thinking, instead of spending all the money for RAID&...
-2 votes
0 answers
15 views

How to assign the specific SRAM area for a specific purpose [migrated]

I want to assign the SRAM start address for a specific purpose like the following. #define STATUS_TASK1 (*(volatile unsigned char *)(0x12000000)) #define STATUS_TASK2 (*(volatile unsigned char *)(...
0 votes
0 answers
74 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 ...
0 votes
1 answer
46 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 ...
0 votes
2 answers
187 views

What is the minimum memory requirement for RHEL 4?

I know RHEL 4 is ancient history now, but trying to find minimum memory requirements on the Redhat website is proving to be almost impossible (or I'm searching for the wrong thing). Minimum CPU ...
2 votes
3 answers
305 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 ...
0 votes
1 answer
389 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....
-1 votes
2 answers
87 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?
38 votes
4 answers
162k views

Difference between 2Rx4 vs 2Rx8 RAM

My IT provider is convincing me there is no difference between a 2Rx4 and a 2Rx8 RAM. A little digging around informed me that x4 means 4 bits on a chip vs x8 means 8 bits. Which is good, but what ...
1 vote
4 answers
227 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 ...
13 votes
3 answers
40k views

how much RAM for heavy static content serving?

I want to make a server for my static content. I need to serve some 3-10 mb files - a lot. (I will also put on this server some .js and .css and images from my websites). I thought of nginx and G-WAN (...
8 votes
1 answer
4k views

linux guarantee or reserve memory for a specific process

Is there a way to reserve a specific amount of memory for a specific service/process? I would like to guarantee that OpenSSH always has enough memory available to it that it can accept a new SSH ...
0 votes
0 answers
304 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 ...
223 votes
13 answers
83k views

Any benefit or detriment from removing a pagefile on an 8 GB RAM machine?

I'm running Windows 7 on a dual core, x64 AMD with 8 GB RAM. Do I even need a page file? Will removing it help or hurt performance? Would it make a difference if this is a server or a desktop? ...
1 vote
1 answer
83 views

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 ...
2 votes
1 answer
7k views

AWS High Memory Usage. How to detect the cause?

I'm using Amazon EC2 instance t2.small. And the memory usage is always increasing up to > 90% usage. Memory usage > 90 % $ free -m total used free shared buffers ...
0 votes
0 answers
308 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 ...
4 votes
1 answer
7k views

MariaDB using much more memory than it should

We are using MariaDB 10.3.32 on a Ubuntu 20.04.4 machine with 6 GB of memory, about 20 applications running on it. Databases are all InnoDB. Even with mostly default settings (see on the bottom), ...
0 votes
1 answer
74 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 ...
3 votes
2 answers
4k views

php-fpm: why do I have a process memory usage higher than memory_limit

I know that there are a lot of related subjects, but I did not found my answer. I have a dedicated server with 32Go of RAM (but I want php-fpm to use only 12Go max), and I have a php-fpm (7.2.13) ...
1 vote
3 answers
1k 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 ...
1 vote
0 answers
57 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 ...
9 votes
4 answers
31k views

MySQL memory usage is too high

I'm running Ubuntu 16.04 on a system with 64Gb RAM + 64Gb of swap partition. It's not a dedicated server so there're other processes running at the same time. Anyway when MySQL daemon is stopped, the ...
4 votes
1 answer
8k views

What is Slab, SReclaimable and SUnreclaim? What does Slab solve and how does it behave under load?

I have a server with 32 gigabytes of ram, with htop reporting 29 gigs used, with 4 gigs of swap in use as well. cat /proc/meminfo returns around 13 gigabytes of memory listed as SReclaiable. What ...
3 votes
1 answer
7k views

CentOS, kernel: out of memory

Hope you can help me with the following problem. We are running a CrushFTP service on a CentOS release 6.6 (Final) system. But nearly every week the service crashes. So I take a look at the logs and ...
93 votes
16 answers
71k views

Why drop caches in Linux?

In our servers we have a habit of dropping caches at midnight. sync; echo 3 > /proc/sys/vm/drop_caches When I run the code it seems to free up lots of RAM, but do I really need to do that. Isn't ...
0 votes
0 answers
51 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 ...
2 votes
1 answer
1k 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 ...
4 votes
1 answer
1k views

ProLiant Gen8 Microsoft BIOS records 8GB put POST only shows 4GB

I've got a HP Proliant Micro Gen 8 server. I've had it a while with 1 4GB RAM stick installed. I've now installed another 4GB RAM stick, its the same type, except its not an HP genuine stick (...
0 votes
0 answers
186 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 ...
0 votes
1 answer
3k 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: ...
0 votes
1 answer
373 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 ...
6 votes
2 answers
5k views

Cannot allocate available memory (even half!) on AWS EC2 instance

I have two slightly different AWS EC2 instances of the same type with a huge amount of memory (c4.8xlarge with 60GB of RAM). One of those instances is just a copy which has been launched from a backup ...
82 votes
3 answers
164k views

How does vm.overcommit_memory work?

When I use the default settings: vm.overcommit_memory = 0 vm.overcommit_ratio = 50 I can read these values from /proc/meminfo file: CommitLimit: 2609604 kB Committed_AS: 1579976 kB But when ...
0 votes
1 answer
1k 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?
6 votes
1 answer
620 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 ...
5 votes
1 answer
110 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 ...
2 votes
1 answer
828 views

Calculation of Xeon server memory bandwidth

I am looking at a dual socket server based on the Intel(R) Xeon(R) CPU E5-2640 v3 @ 2.60GHz The configuration looks like this. 4 memory channels per socket DIMMs are 8x32 GB DDR4 2133/1866 modules ...
26 votes
3 answers
41k views

Linux not freeing large disk cache when memory demand goes up

Running Ubuntu on a 2.6.31-302 x86-64 kernel. The overall problem is that I have memory in the 'cached' category that keeps on going up and will not be freed or used even when our application needs it....
1 vote
1 answer
259 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 ...
29 votes
13 answers
59k views

Memory usage per user in Linux?

Let's say i have 20 users logged on my linux box. How can I know how much memory each of them is using?
3 votes
1 answer
650 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 ...
0 votes
0 answers
202 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 vote
1 answer
902 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 "...
0 votes
0 answers
219 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 ...

1
2 3 4 5
41