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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14 views

Does such a cache (unreduce) actually exist?

I'm reading about cache replacement algorithms and one states (source, page 37) Def. A reduced schedule is a schedule that only inserts an item into the cache in a step in which that item is ...
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1answer
24 views

Ramdisk that persists old files

I've got a program that writes a file to disk, then another processes it. Usually this happens within a second or so, so the file is nearly temporary. To avoid disk IO, I write to /dev/shm. However, ...
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8 views

Path in localhost opened even if local server off

I have localhost "Ampps" and one path i used for uploading files with php opened in browser like some cache even if Apache stopped, http://localhost/tests/public/user_uploads/profilephotos/john/ ...
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0answers
5 views

about bcache cache_lookup(): Can the last bkey in bset be hit?

I want to know whether the seach_key can hit the last bkey in the bset. I think that it can't be hit. void bch_btree_iter_push(struct btree_iter *iter, struct bkey *k, struct bkey ...
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1answer
12 views

Cache big file downloads systemwide on Windows

I'm on Windows 8.1 and I'm working with a lot of scripts that automatically download Linux images and create VMs with it. Also docker images etc. and these VMs or docker images are downloading a ton ...
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1answer
45 views

Why would a screenshot of Windows show up on Linux?

My computer has been acting funny lately (I think my $30 motherboard is going out). However something that really confused me happened just now. I'm running a Windows 10 and Linux dual boot. Some ...
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1answer
41 views

Do nas ssd drives used as cache consume nas drive bays?

My current understanding of ssd cache for r/w is that I need two ssd drives. If that is so, then a two bay nas, such as a synology 716+ drive is not appropriate for me. I would need a model with at ...
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1answer
18 views

View earlier version of a webpage

A clothing webshop I bought from sent me an item that didn't match the description from the website. I sent them an email and they told me the information on the website was correct. I went to check ...
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37 views

Swapping to increase cache?

I am using a server with 128 GB RAM. While running some job I see frequent swap usage. The out put from top top - 05:14:51 up 16:52, 2 users, load average: 3.99, 5.16, 5.37 Tasks: 760 total, 1 ...
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2answers
32 views

Can a CPU cache similar calculations?

When a CPU tries to access random memory it accessed recently, it's possible the memory data is still in the processor cache, and it can retrieve it from this cache. Using this technique, the CPU can ...
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0answers
17 views

No thumbnails in windows 7 [duplicate]

I have Windows 7 Ultimate SP1. I have enabled show thumbnails instead of icons checkbox in folder and search option settings. but still windows shows only icons of the programs that are used to open ...
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1answer
2k views

Upcoming Broadwell-E single-threaded performance in i7-6950X vs 6900K vs 6850K

According to various leaks ( http://wccftech.com/intel-broadwell-e-core-i7-6950x-price/ ) and ( http://wccftech.com/intel-broadwell-e-hedt-computex-2016/ ) the CPU frequencies of the upcoming ...
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0answers
6 views

Does HiKey board have PL310 cache controller or cache lockdown functionality?

I know that HiKey board has Cortex A53 core. Based on ARM v8 specification, it may comes with a PL310 cache controller or some co-processor that supports the similar cache lockdown functionality on ...
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0answers
24 views

Chrome doesn't leverage browser caching on unauthorized/broken ssl

On google chrome when you have a broken ssl This page is insecure (broken HTTPS). The browser doesn't cache the resources. I have a dev.domain.com and a www.domain.com. The www has the SSL attached ...
3
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0answers
23 views

Adjust linux disk flush intervals to avoid blocking user processes

I'm downloading files on a sd card mounted on a raspberry pi using rtorrent, at around 6MB/s (bandwidth cap). The user process doesn't flush the data itself, and the interval at which the disk cache ...
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0answers
29 views

How to force MS word to “cache” a large doc —while opening? (And not after beginning working on it)

I am working with large documents which (probably) requires word to "cache" large amount of data. So it (needs to) freeze during few minutes, after few minutes of editing. The freezing probably occur ...
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0answers
12 views

Clean IMAP local cache in Thunderbird

A friend of mine recently switched to Mutt as his mail client (I will, too). I was told by him that Mutt allows to save only mails with some age (maxage's parameter). Also he thinks that at Mutt you ...
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1answer
46 views

Can I make windows cache files from disk in RAM?

Linux and OS X are caching files from disk in RAM, whenever you have unused memory. Is there a way to do the same in Windows 10? Right now it's doing its best to keep my memory usage at 33% or 45% all ...
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0answers
24 views

Getting Chrome's cached files from a different machine, same google account?

This questions probably reveals how little I understand about how cache works, but here goes. My computer's hard drive failed a few hours ago, taking a school assignment that is due today with it. I ...
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1answer
23 views

Gnome/Mate programs keep copies of seen pictures - when are those deleted?

Mate's file manager Caja stores copies of almost every picture file shown to the user (preview thumbnails) in the user's home directory. So does Gnome's image viewer "Eye of Gnome" (eog) for every ...
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0answers
44 views

Fastest possible 1-liner request generator on Linux webserver

Long story short, I want to make the following 1-line script as fast as it can get: tail -f access_log | grep -v 'some_requests' --line-buffered | sed -u ...
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1answer
59 views

SSD Cache/Buffer for HDD RAID

I have three 3TB 5400rpm HDD's running on RAID 5 in my Ubuntu server VM as my NAS. I recently just hooked up this NAS Server directly to my Desktop via 10GB Ethernet cards and fiber optic cable ...
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0answers
11 views

Do web browsers cache pages and only request if updated? Can they? Why/why not?

I'm just wondering if my web browser ever downloads the same page twice. I speculate that in the future, web pages will merge with applications to the point were downloading a webpage is akin to ...
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0answers
42 views

Using lvm cache for disk spin down

I want to use an lvm cache on an ssd to buffer writes to my bigger hdd for some time so that the hdd can spin down. I probably need the writeback mode for lvm cache, which buffers writes for some ...
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2answers
60 views

Ping Resolving to Strange Address

I have a DNS issue. I set up a Samba share inside my LAN (at my house) on Ubuntu machine with hostname einstein. When I execute ping einstein from a Windows OS (Windows 10), to make sure that einstein ...
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0answers
66 views

How to prefetch HTTP requests in squid?

I'm looking for a (set of) configuration directive(s) or workarounds to make squid 4.x prefetch HTTP requests (e.g. of a link elements on HTML sites). I know about the downsides and that this doesn't ...
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0answers
48 views

MongoDB fails in non-busy hours

I am running a cron job that queries some data from MongoDB during the night, when nobody else is using MongoDB to read or write data, and I get this error Error: server.lab:27017: Read timed out ...
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1answer
84 views

How to use tmpfs and SSD for smart cache

I want to create fast logical disk under Linux for storing temporary files. This files I don't afraid to lost. On my machine I have 128Gb of RAM and 512Gb of SSD disk. So I want use 50% of my RAM as ...
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1answer
33 views

How to view broken picture link in a website?

I need to retrieve certain images within a website, but some of them are unavailable. I have attempted page refresh, browser switching, and wait-some-days-and-try. Still not working. There is cached ...
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0answers
11 views

Prevent Cached Thumbnails on Desktop

When I copy a shared folder from my main Dropbox folder to my desktop, the cached thumbnail signifying that it's shared (icon of 3 stick figures) persists as an overlay on that directory icon on the ...
0
votes
1answer
47 views

nginx returns error 500 when I delete cache

I am using nginx 1.8.1 with microcache to cache some php requests on /dev/shm and it's working fine, however, when I reboot the server the cached files are gone (obviously) but nginx still references ...
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17 views

What does atop 'cache' output really mean?

The atop man page says: An occupation percentage of 90% is considered 'critical'. Notice that this occupation percentage is the accumulated memory consumption of the kernel (including slab) ...
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59 views

Intel PCM ( Performance Counter Monitor ) - Low hit rate for LLC

I am having Intel Xeon D-1520 CPU I tried to run Intel PCM to get the the L3 cache miss and hit ratio. L3MISS: L3 cache misses L3HIT : L3 cache hit ratio (0.00-1.00) Core (SKT) | EXEC | IPC | ...
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0answers
68 views

PrimoCache - How to use my ram to cache “frequent read data” for ssd

How to use RAM to cache frequently read data for SSD (instead of using the SSD to cache like the HDD does)? Example : Everyday I turn on computer and open Firefox, bla bla. This is my "frequent ...
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0answers
42 views

Negative consequences of disabling thumbnail cache on SSD?

A common tip for SSD users is to disable thumbnail cache for 2 reasons: first, the SSD is fast enough to load thumbnails near instantaneously without the cache (disabling the cache doesn't disable ...
1
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0answers
35 views

Windows caches 403 machine-wide?

In all honesty, I have no idea how to formulate this question, it's the weirdest thing I've ever encountered. When developing a website on an external VPS and I encounter on my desktop a 403 or 404 ...
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1answer
88 views

dm-cache doesn't seem to work - no performance difference

I'm creating dm-cache device using my script: http://pastebin.com/KTSzL6EA Effectively it's running those commands: dmsetup create suse-cache-metadata --table 0 15872 linear /dev/mapper/suse-cache 0 ...
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2answers
26 views

Where is DNS cache located on Windows 8.1?

I'm reading about DNS cache and particularly about ipconfig /flushdns command. There are many resources out there - QA, blogs, sites - that explain what is DNS cache but none of them say where DNS ...
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0answers
20 views

RAM backed File I/O

I have an HP laptop which parks its hard drive at the slightest bump, presumably detected by accelerometers. I'm glad it does this. I don't want horribly corrupted data. However, I have some pieces of ...
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0answers
8 views

cache/maintain files for offline device

I have a USB drive that I use as a file store and backup. It is on a separate power strip because I don't want to use it all the time. When it's off, some programs crap out(stall, complain, lose ...
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0answers
19 views

Invalidate/clear cache of eye-of-gnome

I am doing some image rendering, and I replaced an entire directory with corrected images. Now I notice that EOG (eye-of-gnome / GNOME Image Viewer) is entirely not trustworthy with what it displays. ...
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0answers
31 views

How to use SSD as a cache to main HDD? [duplicate]

I installed Windows 10 and a bunch of games on a 500 GB drive. I also have a spare 64 GB SSD lying around. Can I use the SSD as an automatic cache? If so, how? I have looked around a fair bit, but ...
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0answers
11 views

Do I need memcached when I am using mongodb?

How to know if there is a need to implement caching? My website takes all the data from mongodb, mongo itself copies the data to ram, why might someone need another caching mechanism like memcached? ...
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0answers
36 views

I'm looking to setup a NNTP cache/proxy server primarily for header caching on linux. Which one is recommended?

My requirement is that the News NNTP cache and proxy server must be able to cache headers without downloading the articles. i.e only download articles if requested. There is a mention about ...
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0answers
18 views

Isn't overall cache miss time more than direct ram access time

Suppose there is a computer with three cache's L1,L2(inside the processor) and L3(external to the cpu) and a RAM. Now suppose CPU need to access data "ABC" for some operation which is definitely ...
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0answers
11 views

Do application cache/config files benefit significantly on an SSD?

Applications should be installed on an SSD to take advantage of the performance advantage it has over HDDs. However, do cache and config/settings files in the User folder on Windows and the /home ...
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1answer
74 views

Use a SSD on linux to speed up the access to the data files on the HDD without wasting space and wearing it out?

I've bought a brand new 250GB Samsung 850 EVO for my laptop using Ubuntu that I want to use as primary storage device, together with the old, but still pretty functioning, 250GB 7500 RPM HDD that I ...
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0answers
265 views

Why caching service does not cache downloaded app from app store?

I've enabled Caching server on osX server as it has green light. On this stage I downloaded an app from app store but cache tell None in the picture below. Is there something else to configure on this ...
0
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1answer
42 views

Raid Controller Write-Back Cache Behavior

I am trying to understand how it is that the write-back cache on a raid controller can continue to yield a benefit while you're writing a huge random dataset. Let me first say that I understand how a ...
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0answers
37 views

Intel RST/SRT: SSD-Cached Raid but OS on another SSD

I plan to setup my new Computer with a SSD cached HDD Raid 1. Like I understand RST/SRT I have to install the OS on the HDD then. Is it possible to install it on another SSD also? I've currently got: ...