Questions tagged [cache]

An intermediate data storage area with high performance but limited capacity. The term "cache" can refer to hardware cache (on a processor) or software cache (which stores commonly used values in a computer's memory).

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53 views

Can ISPs fake the results of internet speed test?

We moved to a new one he claimed to give us 15mb/s to 30mb/s and 30mb/s upload speed. If you go to any speed testing site, like fast.com or speedtest.net or any other, you see that it shows 30mb/s ...
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How to prevent the back button from being disabled (by Javascript)?

From time to time, I am encountering web sites which disable the back button in Firefox. I suppose this is done by Javascript. Is there a way to prevent the back button from being disabled (perhaps ...
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Is there any selective benefit in caching string instead of an object in Java? Does it differ in Python? [migrated]

I was once suggested by a dear colleague of mine, that it is preferable to store strings in caches instead of the objects themselves (say maps, JsonObjects etc.), for less active caches. The reason he ...
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How does Chrome/Chromium eviction algorithm really work?

Chromium Disk Cache docs state: Right now we have a simple Least Recently Used algorithm that just starts deleting old entries once a certain limit is exceeded, and a second algorithm that takes ...
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Caching large files in ram

I have 4K Video files, which are slow and jerky when played from a HDD. They play flawlessly from an SSD, but my SSD has a limited lifespan, so I don't want to use it playing large temporary files. ...
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PERC controllers (e.g. h710) - do they issue flush command when underlying devices have cache enabled?

Question essentially as in subject - as I've been trying to find any sensible info about it, but to no avail: we create say - raid 1 from 2 mechanical drives - and quality drives, that do not lie ...
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The client loads an old version of my web application. How can I prevent this?

I have a single page web-application (HTML and JS only) that clients visit in their web browser. If I upload a new version of the web application, the client will still load the old version when ...
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51 views

Are there any downsides to using ReadyBoost in Windows?

When ReadyBoost first came out for Windows it was a big deal, but it's rarely mentioned or discussed these days. Even though the average Windows computer now likely comes with 8GB of RAM, the size of ...
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Windows installation and SSD caching

I currently have 3 separate hard drives in my PC, a 250GB Samsung EVO, a 1TB WD Blue SSD, and a 4TB hard drive. My OS is installed on the 250GB drive, I use the 1TB SSD for program installs, and the ...
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How can I make a local cache from a private website/forum?

I wasn't sure if this question was better suited to stackoverflow or superuser, but since there might be a tool out there the allows me to do such a task, I don't need to ask for code. My goal is to ...
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Cache network commands

I have the following situation: I need to install software in a singularity container which fails at several points. Every time it fails, I need to restart the building process. Then, it will re-...
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Prevent filesystem caching on tmpfs

Suppose that I want to put a big file (or a bunch of files) into a TMPFS, for whatever reason. Using dd with various combinations of direct and nocache flags, whether I copy a file from disk or create ...
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Unable to Limit ZFS ARC Size (At Runtime, Without Rebooting)

I am trying to temporarily limit the memory usage of ZFS at runtime, specifically by limiting the maximum ARC size. Before attempting to do this, we first check the current settings and sizes: # cat ...
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Website is faster on second load (with cache disabled on both first and second load)

First load without cache: 1.9 seconds Second load without cache: 1.3 seconds If I wait 1 minute then it takes 1.9 seconds again to load Is there some hidden 1 minute cache in browsers or Windows ...
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Receiving “Failed to start A high performance web server and a reverse proxy server.” after redis installation

I received the following error: Processing triggers for ureadahead (0.100.0-21) ... N: Ignoring file 'plesk.list.ai_back' in directory '/etc/apt/sources.list.d/' as it has an invalid filename I ...
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Chrome cache loading error

I am having an issue where Chrome occasionally doesn't load a page fully (e.g. toolbar icons for Google Docs don't appear, stackexchange page doesn't load styling, etc). Here is a screenshot (email ...
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Killed fstrim my bcache btrfs raid?

Imagine the following setup: 6x 2TB SATA drives, one 1TB NVME SSD, Ubuntu 18.04, Kernel 5.3.0-40 I configured the SSD as a bcache caching device and the HDDs as bcache backing device, formatted them ...
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Icon is default “blank page” in properties and when the program is pinned to the taskbar

The unity icon for version 2018.4.16f1 (64-bit) is missing in properties and on the taskbar and instead I see the default blank page icon on both. So far: I tested with resource hacker, removing ...
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How many files should the borg-backup cache contain and how can I clean it?

I use borg-backup for making backups. Because of filling my root partition, I encountered its cache files, that take up several GB: # ls -al /root/.cache/borg/ total 4 drwx------ 1 root root 792 23 ...
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Mounting available drive through autofs

We manage a lot of workstations on CentOS 7.4 with different hardware configurations. They all share an automount map managed by FreeIPA. On those workstations, we mount a cache disk on /path/to/...
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Can I configure VLC to cache entire playlists?

I stream albums from my server, using the VLC's playlist functionality. VLC seemingly doesn't cache the upcoming tracks at all and loading the next one seems to often take around 30 seconds (re-...
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Drive can't be ejected the first time, despite “Quick removal” being enabled

This related answer isn't relevant because it's FAT-specific and I use NTFS. I have a 1.5TB BitLocker-encrypted external hard drive formatted in NTFS on which I make large backups using BorgBackup on ...
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Why would Linux use swap space when there is so much buffer/cache available?

When would Linux choose to swap out instead of using the free memory or buff/cache space? Here is my data on my computer: $ free total used free shared buff/cache ...
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Hazelcast on Kubernetes

I'm running Hazelcast statefulset on dev branch. This is my statefulset YAML file: apiVersion: apps/v1 kind: StatefulSet metadata: name: hazelcast namespace: dev labels: app: hazelcast spec:...
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nginx returns status:500 when upstream_cache_status:UPDATING

I use proxy_cache_use_stale with updating attribute. I grep my logs for the $upstream_cache_status UPDATING value and found many matchs but I can't reproduce this situation. Can you please help to ...
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Transience of files in filesystem cache

In my simplified understanding of a filesystem cache, files that are to be written to a disk mounted with the async option might not be immediately be written to disk, and can instead get smushed into ...
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503 views

Windows 10 unable to disable ALL caching of files to memory

I'm trying to disable windows file write cache. I have disabled the Sysmain service, disabled Prefetch in registry (EnablePrefetcher = 0) and I have even tried turning off disk write caching in the ...
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how to run a linux program faster after its first execution

I use a Sophos antivirus program to scan email in antispam software ASSP, server OS Centos 7.4, MTA EXIM. It run in this way /usr/local/bin/savscan -sc -s -archive /file It works very well to block ...
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I can ping my site, but get timed out in browser. (Only on my windows desktop)

I have a site and it works for everyone and on all my devices except my windows desktop. (works on the same machine if I boot on linux). I can ping it from the command line with no problem, but I can'...
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54 views

Proxy/cache with with download accelerator (parallel range requests)

I'd like to use SuperUser collective wisdom to find an http proxy-cache with integrated download accelerator or in other words: parallel range requests. The use case is: a user requests a large file, ...
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44 views

Is there a way to wipe complete GTK cache?

GTK remembers a lot of stuffs like the last folder I used when you try to "Save As" in any application, the size of the "Open File" window. Is there a way to remove that? I have cleared: rm -f "${...
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578 views

Can you put the BitTorrent cache on a USB flash drive?

I wonder if there's any way to improve BitTorrent performance by putting any cache on a USB stick, like the ReadyBoost in Windows?
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Is there a way to dynamically move a file from one device to another at the time of an SMB request?

I am trying to figure out a way to move files on the fly from a traditional HDD to an SSD when a user requests a file via SMB So the user would browse the server and when selecting the file it moves ...
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Disable Linux Page Cache for Reads

Is there a way to turn-off page caching for reads in Linux? More specifically, I would like my processes to read directly from the disk. The setting of my problem: I am trying out new query ...
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178 views

IrfanView replaced my Settings' and Your Phone's icon

I have nearly brand new Windows 10 1903. A day after installing it from scratch, I have installed Irfan View as well. Another day later I have realised that it has (?) replaced my Settings' icon: ...
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179 views

Resiliency in Tiered Storage Spaces Volume

I am using Windows 10 When creating an SSD tier and HDD tier with New-StorageTier command, I am able to set ResiliencySettingName (If unset, it seems to default to Mirror). Then, when creating a ...
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192 views

how to trim SSD cache drive in zfs 0.8

I have upgraded zfs to kmod-0.8.2-1 for SSD trim and trim function works well for normal zfs SSD drive but does not work for SSD cache drive(sdc in the below log). How can I trim it? Thanks in ...
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Force clear standby memory and cache [ Windows 8 ]

I love faster app loading , i really love it when i click an application and it is opened 3 seconds later , i do love it. But for the love of god , i hate it when i run a heavy program in my potato ...
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Decode Google Chrome cache file OSX

How can I decode the Google Chrome cache files located in /Users/[USER]/Library/Caches/Google/Chrome/Profile [NUM]/Cache named like 0a0b447d0216bd30_0 and looking like: 0\r�m����8��https://...
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What is practical size for bcache cache size with respect to hdd size?

There are plenty of manuals how to implement bcache, how to select correct bucket size, how to resize (grow) backing device and so on. This includes, but doesn't limits to in-kernel documentation, ...
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How to drop memory caches in macOS?

In GNU/Linux there's a way to drop_caches. drop_caches is the command that would flush caches from the main memory. I don't have such a command in macOS. How to..?
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References in objects stored as values in ehcache are disappearing

I am using ehcache (3.8.0) with Java (1.8.0_222) to store values on the heap that are retrieved from a SQL database. The issue I'm having is that the stored values are lists of objects, and those ...
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Run cached PHP scripts if error found

Using a Nginx web server, in case a PHP script has some error, how can you serve a cached version of the working file instead? I'm currently seeing this behavior in a server, but I couldn't find a ...
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How does RAM keep up with the CPU?

I am trying to understand how RAM manages to keep up with the CPU. Here is a breakdown of why I'm under the impression it wouldn't: The clock speeds of modern CPUs are often greater than the clock ...
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Local FreeNAS/other NAS system cache server

I am planning to upgrade my NAS setup Since I am getting a decent fiber connection in my second house, I would like to move my noisy Supermicro box there, and set up a local caching server in my main ...
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Is there an extension to quickly clear / flush / invalidate the Firefox DNS cache (Quantum)

There used to be several DNS flushing add-ons prior to Firefox Quantum. Are any currently available? Is this no longer something that's accessible through the addon API? Yes, I realize that I can do ...
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71 views

SSD or cache - which matters more?

Now that I have 2 options for a low budget laptop: AMD A6 1MB cache, 256GiB SSD. AMD Ryzen3 5MB cache, 1TB HDD Which one is likely to yield better responsiveness in user applications (non gaming, ...
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206 views

How to disable USB floppy disk caching on Windows 10?

A few seconds after connecting a USB floppy disk drive to a Windows 10 computer, the whole disk is read to cache (making every file readable without additional physical reading). Is it possible to ...
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NGINX Caching: behave as private cache

I'm trying to setup NGINX as an HTTP cache in front of a webserver and found this great guide: https://www.nginx.com/blog/nginx-caching-guide/. The default behavior is that NGINX won't cache any ...
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Memcache efficiency and usage

I recently started running memcache-tool-ng to analyze my slabs etc. The results that I get back make me think our implementation is horrible, at best. I'm looking for some pointers as to how we ...

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