Questions tagged [memory]

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

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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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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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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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My computer is always short on RAM

This probably has been asked hundreds of times but still I couldn't find a proper answer to my question. My PC is rather new and it has Windows 10 OS, and a rather descent hardware. It has 16GB of RAM ...
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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: [ [email protected] ~/work ] $ free -h ...
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144 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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41 views

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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78 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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94 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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59 views

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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42 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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555 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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