Linked Questions

Is there any command that by using I can clean the cache in RHEL? I used this command: sync; echo 3 > /proc/sys/vm/drop_caches but it didn't work.

In Mac I use purge to free up some memory. What is equivalent to it in Linux(Ubuntu Server)? apt-get install purge gave me nothing. If you are no familiar with Mac's purge here is it's man page: ...

I remember, back from my days with Windows Vista/7, that there was a tool called memclear or memclean that would free some memory by invoking the NT garbage collection API. Probably it cleared cache ...

Following this question I can reproduce that the first time I execute a du of a directory it takes longer than if I do it just after. Where is this caching happening? How can I clean it? I would like ...

I want to make a fresh new copy of a large number of files from one local drive to another. I've read that rsync does a checksum comparison of files when sending them to a remote machine over a ...

As part of doing some cold cache timings, I'm trying to free the OS cache. The kernel documentation (retrieved January 2019) says: drop_caches Writing to this will cause the kernel to drop clean ...

I have a Debian (Buster) laptop with 8 GB RAM and 16GB swap. I'm running a very long running task. This means my laptop has been left on for the past six days while it churns through. While doing ...

Whenever I reboot my laptop, everything runs amazingly and I have a maximum of 40% memory usage (out of 8GB). However over time (~ 1 day of usage), memory usage goes up to 90%+, and the system starts ...

The output of the top command shows that 29GB of memory is used by "buff/cache". What does it mean and how I can free it? It is near to 90% of memory.

For a really big file like 1GB wc -l happens to be slow. Do we have a faster way calculating the number of newlines for a particular file?

Classical situation: I ran a bad rm and realized immediately afterwards that I had removed the wrong files. (Nothing critical and I had tolerably recent backups, but still annoying.) Knowing that ...

So, I'm trying to do some investigation on where does swap use come from in a system with high swap usage: # free total used free shared buffers cached Mem: ...

I know this is a lame question, but I want to understand why CentOS consumes my Physical memory when certain process stopped. Suppose I have opened a file of 10GB then it consumes 10GB in ram and ...

This question answers to the question on how to find the what is part of cache. However, in the fincore executable you have to pass the filename to check if it is part of cache. Is there a tools or a ...

Background My question is basically a follow-up to this question and answer, and in particular, this comment. Whenever I have to copy or rsync large amounts of files, the memory on my system tends ...

I came across this . And then remembered seeing this something back. Could anybody elaborate is there any need for a user to ever flush the caches or it's only need is when you want to benchmark ...

The Linux kernel implements the page cache to accelerate I/O operations. It would be helpful to be able to turn off and on the page cache for research and testing. How can the Linux page cache be ...

I am aware that sync command flushes the dirty cache into disk. I have run free command first, then sync, and then free again. The result of latter free command shows more free memory available than ...

I am writing a batch script to sort through gigs and gigs of data. All of the data is text but the script will take a long long time to execute. I would like to give some visual indication that the ...

I have a process that reads data from a hardware device using DMA transfers at a speed of ~4 * 50MB/s and at the same time the data is processed, compressed and written to a 4TB memory mapped file. ...

After reading this link: How do you empty the buffers and cache on a Linux system?, I know that there are some commands that can help us to empty the buffers and cache of the OS. But I'm not sure if ...

I am working on ARM-based processor (OS version: Linux 3.4.35) and I need to analyze the processor's performance while some processes are running, by typing top command, I can see some statistics but ...

I'm reading this article on clearing buffer/cache from my new Linux VMs since they're taking a full 1/3rd of my RAM, so I ran this: sync; echo 1 > /proc/sys/vm/drop_caches This immediately fixed ...

My buffer memory in server got increased after taking backups from multiple servers using rsync. This disk got almost full, removed the backups. As far as I understand buffers shoot up if we perform a ...

I use a laptop for work and therefore I only do a suspend to RAM rather than shutdown everyday. so I do not have to start each application again every day. after some days of "run time" I ...

I'm trying to read the contents of a file using the file's inode. This works fine: echo "First line" > data.txt sync sudo debugfs -R "cat <$(stat -c %i data.txt)>" /dev/...

The following command takes about 10 minutes to output the result find . -name "muc*_*_20160920_*.unl*" | xargs zcat | awk -F "|" '{if($14=="20160920100643" && $22=="567094398953") print $...

I have 8GB RAM, and use my PC (Debian 10, KDE plasma 5.14.5) "normally" but with many programs running in parallel: Firefox (≈ 250 Tabs) Chromium (10 Tabs) Thunderbird 10x Okular 2x Pycharm ...

I develop a system (x86_64 based) that runs Linux (Ubuntu 14.04.3) and has several pieces of custom built hardware connected. I have written drivers and control software for the custom hardware. ...

I became curious when I was diffing two large (>326MB) files, and noticed that the second run took much less time than the first. This was frustrating, since I was trying to time the second run, to ...