a cache stores temporary data nearby so that it can be retrieved much more quickly than fetching it from the real backing store (disk, network), or recalculating some result all over again

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6
votes
2answers
12k views

How do I correctly enable PHP 5.5's OPCache in Ubuntu 14.04?

I'm setting up a local server to test configurations; it's a clean 14.04 LAMP server, as selected during OS install. If I understand correctly, OPCache comes with PHP 5.5 (php -v confirms this) but ...
1
vote
0answers
451 views

Can't configure NGINX to cache the images

I have been trying to cache images that are stored in nginx server, I am quite new here and to nginx I have installed it and configure it with php5-fpm, I have been reading many tutorial regarding ...
3
votes
3answers
3k views

Why does my system use so much cache?

Previously, on my desktop computer running Ubuntu 14.04, I had 4GB RAM, which I thought should be plenty. However, after being on for a while, my computer would seem to get slow. I have a system ...
1
vote
1answer
45 views

More about JuJu cache

I would like to know more about JuJu cache. After I start a charm and JuJu provisions a machine for the first time, the charm will be downloaded and all dependencies installed (apt-get, etc). This ...
1
vote
2answers
950 views

Why won't Ubuntu tweak delete my Thumbnail Cache?

In Ubuntu tweak 0.8.7 which is installed in my Ubuntu 14.04 LTS running unity I could not delete a particular file called 'fail' in the thumbnail cache. I am actually trying to remove that file with ...
0
votes
2answers
39 views

How to update a machine from packages downloaded on a different but similarly configured machine?

I have two laptops with similar configuration. I have updated one and would like to use the cached packages of this to update the other one. I cannot find a way. I did Ctrl+A then Enter but machine ...
0
votes
1answer
154 views

Should I put /boot on SSD or HDD

I am running Lubuntu 14.04 64bit. I am planning to implement EnhanceIO to use my new 25GB SSD drive for caching my 4TB RAID 0 array. The raid array is partitioned as: 500MB /boot, 20GB /, 200GB ...
2
votes
1answer
1k views

Clear .cache tracker directory in ubuntu?

I created a partition for Ubuntu and I just ran out of space a couple days ago. I used the Disk Usage Analyzer and I realized that for some reason the directory /home/.cache uses up a lot of disk ...
1
vote
1answer
158 views

Know programs in cache

I have this situation with RAM and SWAP at the moment: $ free -h total used free shared buffers cached Mem: 7,7G 7,5G 159M 100M ...
2
votes
0answers
243 views

Disable filesystem read cache

How can I disable the Linux filesystem read cache for Ubuntu 12.04? I do not want to only free the actual cache ( echo 3 > /proc/sys/vm/drop_caches ) but disable the read cache completly.
0
votes
1answer
157 views

my cache fills up but never goes down

I know Ubuntu manages memory autocratically, it stores cache on ram for quick program access, but every time I fill up the cache, it stays filled up, and Ubuntu it self cant delete the cache, if I ...
3
votes
1answer
245 views

Disable memory cache - real reason

OK, before you mark my thread a duplicate I want to say, that I know this very good answer: How do I clean or disable the memory cache? But this is not case for me. I am making some performance tests ...
0
votes
2answers
88 views

How to remove packages from the apt cache that are not currently installed?

I want to organise my apt cache folder so I want to remove packages that are NOT currently installed and keep packages that are ONLY currently installed
2
votes
0answers
203 views

INCONSISTENT usb write/copy speeds; cache problem?

Foremost, slow USB write/copy speeds seem to be a hackneyed topic. But this issue is one I've not seen presented elsewhere. Thanks for showing this novice your support. I'm copying the same .iso ...
1
vote
1answer
214 views

How does Ubuntu remembers process history?

Recently I noticed two things in my Ubuntu-13.10(32-bit) and would like to get cleared. Scenario-1: One of the functionality of terminal is that you can get previous commands by using "UP" arrow ...
1
vote
1answer
91 views

Clearing OS Cache

I'm guessing that's what it is. I reinstalled Ubuntu and replaced my newly created home directory with my old home directory. Problem is, my new Ubuntu doesn't have XYZ program installed and when I ...
2
votes
0answers
156 views

No automatic thumbnail generation

I recently decided to do a fresh install of 13.10 and ran into a quite peculiar problem. It seems that thumbnails are not generated automatically, when I open a folder in nautilus I can only see a ...
-1
votes
1answer
1k views

EnhanceIO: Write-through vs Read-only

I have installed an EnhanceIO SSD cache on my notebook. EnhanceIO supports three caching modes: read-only, write-through, and write-back. Read-only caching mode causes EnhanceIO to direct ...
5
votes
2answers
909 views

Ubuntu tweak and Mozilla (firefox and thunderbird) cache

I usually use Ubuntu tweak to do cleanup jobs on my PC. This includes apt and program cached data and old kernels. This goes alright for most programs except Mozilla based application - Firefox and ...
-2
votes
2answers
489 views

How to disable caching in Ubuntu? Does Ubuntu consume more RAM? [closed]

I just viewed Hacker News. There is something mentioned like "Linux ate my RAM". How much is it true that linux consumes more RAM. It will be helpful if someone can provide guide to remove cache of ...
1
vote
2answers
75 views

How to start in background a list of applications on login

I observed the following thing: I login on my computer account. I run in the Terminal some-app I wait about 20 seconds to start. Then I close it. I run same command in terminal. It start in about 1 ...
2
votes
2answers
23k views

How to clean /var/cache?

When I woke up this morning, I found my root had filled overnight du -hx --max-depth=1 / 132M /boot 4.0K /media 16K /lost+found 16M /root 702M /lib 4.0K /OLDHOME 8.2G /usr ...
0
votes
1answer
477 views

How to cache (more) data on SSD/RAM to avoid spin up?

I have Ubuntu server 12.04 running on a 40GB SSD with a raid 5 mounted for media files. I access the files often via samba either with a Raspberry Pi for music playback or with another PC for the ...
2
votes
2answers
592 views

SSD cache for Lenovo Y500

I have a Lenovo Y500 with a dual GTX650M, 16Gb SSD and 1Tb HDD. I just install a clean Ubuntu 13.04 then upgrade to 13.10. Previously I had windows 8 but I cleaned it off and only use Ubuntu 13.10 ...
1
vote
1answer
927 views

How can I limit the size of my ~/.cache folder

I'm running Ubuntu on a limited-size SSD, so I count every GB. Now, the ~/.cache folder grew to 1.7 GB (various applications such as Chrome, Spotify etc. filled it up) and now I'm wondering if there's ...
7
votes
2answers
4k views

How can I clear my cached gpg password?

I've tried: the SIGHUP method --> no succes the cache timeout in gpg-agent.conf --> it seems that this file is not read, althougt I have the 'use-agent' line in gpg.conf What should I do ?
1
vote
2answers
54 views

select packages related to some program in apt archive

Suppose that I have installed a program "someProgram". Now, I want to select the .deb packages that were downloaded into /var/cache/apt/archive folder. How can I select the packages related to ...
0
votes
1answer
88 views

Server to cache HTTP data

I'm looking for software for ubuntu where I can place my ubuntu server on my network in such a way that at the very least all HTTP traffic is filtered through the ubuntu server. This way, I can make ...
4
votes
1answer
4k views

What Does Cached Memory Mean when Viewing htop?

While viewing the reports of htop, I would like to know what the orange/brown 'cached memory' bars actually indicate. Really I'm looking for a more practical explanation of what I'm looking at, rather ...
3
votes
3answers
535 views

Creating tar fills system cache

My situation is pretty simple: I backup-ed some of my documents and put them on a NAS and since I rather transfer one big file instead of million small ones, I created a tar tar cf ...
0
votes
1answer
198 views

Mem vs cache in system monitor?

In the above menu, what does the difference between Mem and cache? Are they both use memory from my RAM? Which program use cache?
1
vote
1answer
3k views

connect to another proxy through squid

i have an HTTPS proxy outside which uses username/password for authentication and i want to configure squid on ubuntu 12.10 to direct all connections which are not in it's cache to that proxy. how can ...
0
votes
1answer
582 views

Cache NFS Shares on Local Disk through Virtual Machine

I'm running 64-bit Ubuntu 12.04 and trying to set up FS-Cache using CacheFS as the backend on a virtual machine which is using Ubuntu 12.04 32-bit After following this tutorial to use cachefilesd, How ...
2
votes
1answer
157 views

Ubuntu sudden crash - Cache_Error

I was drawing svg in a text editor when, suddenly, Ubuntu 13.04 crashed on me displaying a few lines, similar to each other. Here are the two first : [30714.772014] nouveau E[ 1265] failed to ...
1
vote
1answer
227 views

New XPS, Starting on Linux, Still a Windows power user, configuration question

I just bought a Dell XPS with Windows 8. Spent several months making the choice. The OS is on the 500GB HDD, and the 32GB SSD is used as cache.. seems standard. I've been wanting to get into Linux ...
0
votes
1answer
2k views

Error opening cache E: read error -read (5:input/output error)

I tried to install 13.04 after downloading and burning on a boot disc, or 12.04 from a disc from a magazine over windows 7 on a netbook but got the following code an error occurred, please run ...
2
votes
0answers
430 views

Error while updating via terminal from Ubuntu 12.10 to Ubuntu 13.04

I get this error multiple times (and these codes underneath still run for some reason) This likely means that your installation is broken. Try running the command: gdk-pixbuf-query-loaders > ...
0
votes
2answers
248 views

How can I clean my software caches from the command line?

In the upgrade from 12.10 to 13.04 I lost the ability to use Ubuntu Tweak's Janitor to clean caches so I would like to know how to do it from the command line.
0
votes
1answer
1k views

How can i enable adobe flash player to use local cache

As the title says: using ubuntu 12.04LTS, how can i enable adobe flash player to use local cache?
0
votes
1answer
2k views

dump cache of bind dns

when I do rndc dumpdb then this file has no new cache dumped (18.04 was yesterday, I don't know how I did this dump) and looks like: > ; ; Start view _default ; ; ; Cache dump of view '_default' ...
6
votes
1answer
4k views

What is icon-theme.cache?

When I run the following command on my Lubuntu 12.10 [11:09 PM] ~ $ find /usr/share/icons/ -iname icon-theme.cache -type f I get the following (after adding the last modified date and size): ...
0
votes
1answer
891 views

how to check if cache is working

is there a way to check if disk cache is working on a regular sata disk? i see "asking for disk cache failed" error messages, but discovered my laptop has a 1gb solid state drive without a ...
2
votes
0answers
364 views

How can I make squid-deb-proxy work with proxy authentication?

I have squid-deb-proxy working fine without a problem without apt proxy authentication. However when I add a proxy file to /etc/apt/apt.conf.d and put in my proxy authentication inside this file. ...
1
vote
1answer
3k views

How do I flush out the DNS resolver cache? [duplicate]

On Microsoft Windows OS, at the command prompt, I issue the command ipconfig /flushdns to flush out the DNS resolver cache. On Ubuntu 12.10, what is the corresponding command?
0
votes
0answers
26 views

how do i install ubuntu on ssd cache and maintain windows acceleration? [duplicate]

I hope this is the right place to ask this question. I just bought a lenovo u310 preinstalled with windows 7. It has a 32 GB ssd cache drive and a 500 GB hard drive. I want to install Ubuntu root ...
3
votes
0answers
45 views

What is the optimal configuration for a laptop with a 24GB SSD cache? [duplicate]

I have a Sony Vaio ultrabook that contains a 24GB ssd drive and a 750GB hard disk. What is the optimal configuration for installing ubuntu on this to get the most out of the hardware? Would I be ...
44
votes
4answers
25k views

How do I install and use flashcache/bcache to cache HDD to SSD?

I want to know if there is anyone who has tried installing and running their kernel built with flashcache or bcache for SSD caching? How did you manage to do it?
4
votes
1answer
7k views

Can I cache an mdadm raid with an ssd?

I have a 1TB array set up in raid 1 using mdadm on Ubuntu 8, to store mission-critical files. I'd like to speed up read/write, especially for large files by caching to an SSD. Is this possible? Does ...
0
votes
2answers
402 views

Configuring a HTTP and HTTPS web accelerator using Varnish

I have installed and configured varnish on my new server. The server is currently working for http traffic. I would like to also forward SSL traffic to my webserver. It is not necessary to cache this ...
1
vote
0answers
131 views

Disk cache is sometimes dropped/erased

I have a memory/cpu monitor running, and sometimes see the graph line for “cached memory” drop, for no apparent reason. Earlier today Cache memory was at about 4.8GB but then dropped in two steps ( a ...