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).

Filter by
Sorted by
Tagged with
0
votes
0answers
367 views

The use of micro-instruction cache

I learnt recently that Sandy Bridge uses a micro-instruction cache akin to the execution trace cache in Netburst. From what I know, many of the simpler x86 instructions (those translating into 4 micro-...
1
vote
0answers
15 views

Webapplication displays different images in a network

I agree that this question should be asked in stackoverflow.com and not here. I'm asking it here because it is related to networks and configuration. I've web application and it has some static ...
0
votes
2answers
825 views

46/48 physical virtual addresses

Some processors support physical addresses of 46 bits and virtual addresses of 48 bits. Why 46 bits, why 48 bits? Shouln't x86 support 64-bit addresses? Why are virtual addresses not the same length ...
1
vote
0answers
853 views

Youtube video loads from ISP, not Google

Using Wireshark, I noticed that the Youtube video I was watching had the source address of my ISP, not Google. Does this mean my ISP is using Google Cache and loading all video from there? If so, what ...
0
votes
0answers
71 views

Windows Apps like Store, Weather, etc, crashing

So For some reason everytime I try to open a windows app like Weather, Store, etc, they do wierd things. for example 'Weather' crashes while launching, 'Store' crashes when clicking on an app. Anyone ...
2
votes
1answer
381 views

Why does bcache in writeback mode cause a clicking sound from my HDD?

I'm using bcache in writeback mode with a small SSD as the cache device and a large HDD as the backing device. When I leave writeback_percent at the default value of 10, there's sometimes a faint, ...
0
votes
0answers
52 views

Is There a Difference Between The Disk Cache and The Disk Write Cache?

I just want to make sure that by attempting to increase my Disk Cache, I am not delaying Write cache flushes to happen any later than they are now. If the Disk cache and Disk Write cache are two ...
2
votes
2answers
8k views

Windows Server Storage Spaces tier write-back cache, how to configure threshold that determines if write is performed on write-back cache?

The Storage Spaces feature included with Windows Server 2012 and the upcoming Windows Server 2016 consists of a virtual disk. In a tiered storage deployment a write-back cache is created (the default ...
1
vote
0answers
786 views

Bonjour seems to cause hostname to resolve to old IP

I have some devices on a network and an administration tool that relies on bonjour for device discovery. The devices are set to use DHCP. Example scenario as follows (let's assume really short DHCP ...
1
vote
1answer
51 views

Is there a disadvantage in starting multiple applications simultaneously?

Basically I'm wondering if a principle like cache locality, i.e. it's advantegous to access consecutive pieces of memory because usually bigger chunks of that memory are loaded into cache, also ...
1
vote
0answers
606 views

Windows equivalent of lvm-cache

I'm going to be using Windows 7 for a few months on a custom built x86_64 Intel-based platform with Z97 motherboard. Being an avid linux user, I was wondering: does Windows have any form of managed ...
2
votes
2answers
410 views

How do you clear the drive cache in Windows?

I am developing an I/O bound application, and I am trying to track down a bug that occurs when reading from slow moving drives. The problem with tracking down this Heisenbug is that something - the ...
0
votes
1answer
126 views

How can I cache a small table data on a Db side?

Say I have a table Statuses in which the data doesn't change for a long time and there're a few records only. I need to use it often in joins. How can I cache data from it on the Db side, in ...
2
votes
1answer
1k views

Does my local computer work as DNS server?

I want to know if my local computer works as DNS server. I mean, when it tries to resolve internet addresses does it first look in it? Like, is there a DNS cache in Windows 7 or the internet browser? ...
6
votes
1answer
17k views

What does L4 cache hold on some CPUs?

All modern multi-core CPUs have at least a three-level cache (refer to Why do we need multiple levels of cache memory?). L1 is the fastest and smallest, L2 has slightly more latency but is larger, ...
0
votes
0answers
3k views

How can I use my an SSD partition as a cache for a large HDD on Windows 10?

I have a 480gb SSD on with installed Windows 10 and Applications. However i also have a 2.5TB (and growing) steam/gog Game Library currently on a HDD that i'd like to cache with a >=256GB partition ...
0
votes
0answers
42 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 ...
-1
votes
1answer
55 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, ...
-2
votes
1answer
36 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 ...
0
votes
1answer
61 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 ...
2
votes
1answer
718 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 ...
1
vote
1answer
29 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 ...
0
votes
0answers
519 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 ...
0
votes
2answers
73 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 ...
0
votes
1answer
6k 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 ...
4
votes
1answer
4k 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 ...
1
vote
0answers
109 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 freezes, (high CPU, fan) during few minutes, after few minutes of editing. The freezing probably ...
2
votes
1answer
2k 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 ...
0
votes
1answer
420 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 ...
4
votes
1answer
1k 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 (...
0
votes
0answers
25 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 ...
1
vote
2answers
463 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 ...
1
vote
0answers
912 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 ...
1
vote
0answers
111 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 ...
0
votes
1answer
1k 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 ...
1
vote
1answer
655 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 ...
3
votes
0answers
347 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) and ...
1
vote
1answer
693 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 | ...
1
vote
0answers
47 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 ...
0
votes
2answers
806 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 ...
1
vote
3answers
8k 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 ...
1
vote
0answers
36 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 ...
0
votes
0answers
43 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 ...
0
votes
0answers
233 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 Caching/...
-1
votes
1answer
778 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 ...
0
votes
0answers
467 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 ...
1
vote
1answer
247 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 ...
-1
votes
1answer
871 views

Any point in having SSD cache with SSD system disk?

Apologize if the title is unclear, had a hard time formulating the question in a sentence. So I have a Lenovo Y510p which originally came with a 1 TB HDD as system drive and 24 GB SSD cache (M.2 ...
0
votes
0answers
28 views

Something is caching my web page

I have a page that is marked do not cache. When I hit Ctrl-F5 on my browser, I git the current version and an older version, each about %50 of the time. Something is caching it somewhere. We have ...
1
vote
0answers
1k views

How to disable caching in windows server 2012 R2?

How to disable caching in windows server 2012 R2 ? Any way to set it to a minimal value is also fine. Also disabling caching for a particular application will also work as only 1 application is run ...

1
3 4
5
6 7
13