High speed RAM which is used by the computer processor to store often-used operations for the purpose of taking less time to perform large computational tasks

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1answer
186 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
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0answers
22 views

What software can write to Cache memory?

I was working through a Higher Computing past paper and the following question came up Describe a situation where the cache memory would not improve the processor’s performance (1 mark) The ...
0
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0answers
17 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 ...
1
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0answers
36 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 ...
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2answers
60 views

Is it possible to run Windows 98 SE from L3 cache with no RAM installed?

Modern CPUs can have L3 cache in the range of tens of megabytes (e.g. 24MB). W98SE requires at least 16MB of RAM to run (24MB recommended). Is it possible to use the L3 cache as RAM, without any ...
0
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1answer
55 views

which one of these units is not located in the microprocessor?

I'm doing a test on general computer science and I think the answer sheet is wrong. The question is as follows: which one of these units is not located in the microprocessor? 1) Cache ...
0
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0answers
36 views

Max bandwidth cpu requires from main memory

Cpu clock = 4 GHz with L1-L2 cache, Max CPI = 0.5 (or IPC = 2), 25% of instructions are load/store, Global miss rate of L2 cache = 2%, Block size of L2 cache = 64 bytes, L1 I-cache: 100% hit rate ...
0
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0answers
85 views

Is ARM PL310 only in Cortex A9 processor?

I know that ARM Cortex A9 processor can be equipped with PL310 cache controller. However, I'm not sure if other ARM processors may support PL310 cache controller? I searched Cortex A7, A53, and A57, ...
0
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0answers
38 views

Is different data stored in L1 cache in comparison with L2 and L3?

Since L1 is faster to access however is smaller, what gets stored here? And what goes to L2 and L3. I'm wanting to know why data goes to L1 or L2 or L3. Do instructions only go in L1? And why would ...
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0answers
388 views

L3 data cache ECC error

I happened to have a terminal window open in Linux (Debian) and, as I was browsing the web, I heard a beep so I looked to see what happened and I found the following message in the terminal window: ...
0
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0answers
311 views

How many bits are in the address field for a directly mapped cache?

Here is the problem I am working on: The Problem: " A high speed workstation has 64 bit words and 64 bit addresses with address resolution at the byte level. Assuming a direct mapped cache with 8192 ...
0
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2answers
198 views

My L3 cache size showing zero in wmic (cmd)

I purchased a desktop system which has 6 MB Cache. When I checked the L3 cache in the BIOS I didn't find a L3 cache. I the tried to use another method in from the command line to confirm the L3 cache ...
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1answer
107 views

How is addressing done of L1/L2/L3 cpu caches vs. ram allocation? [closed]

As cache sizes on cpus increase, how is it managed vs. RAM? Do considerations need to be made while making an application to ensure you're getting the most out of your Cache or is that completely at ...
16
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3answers
2k views

When is CPU cache flushed back to main memory?

If I have a CPU with two cores, each core has it's own L1 cache, is it possible that Core1 and Core2 caches a same part of memory at the same time? If it is possible, what the value of the main memory ...
2
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0answers
106 views

Missing L1 cache characteristic

I wrote simple program (with help of Igor Ostrovsky's article 'Gallery of Processor Cache Effects') which supposed to examine levels of cache in my processor. According to Coreinfo provided by ...
0
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4answers
327 views

Is too big cache a bad idea? [duplicate]

I am going to pack a new computer for myself and I thought about Xeon series as main processor. Xeons tend to have very big caches even up to 32MB. And here is a question: Is it a big advantage to ...
1
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1answer
494 views

In L1, L2 cache and DRAM, is sequential access faster than random access?

In L1, L2 cache and DRAM, is sequential access faster than random access because of the possibility to establish read-ahead? I know in HDDs this is of-course faster in orders of magnitude.
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1answer
184 views

Why is loading chunks of data into the cpu cache an efficient way of processing?

I know that loading instructions into the cache increases the speed of processing overall. Is the answer to the question connected to organization and speed?
1
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0answers
661 views

Syslogd: hardware error

The machine has been sending these messages to the terminal, paired with beeps from the speaker on the motherboard. These messages appear every 5 minutes, sometimes naming CPU2, sometimes CPU3. ...
6
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1answer
4k views

Processors cache L1, L2 and L3 are all made of SRAM?

Are Processor caches L1, L2 and L3 all made of SRAM? If true, why L1 is faster than L2 and L2 is faster than L3? I did not understand this part when I read about them.
0
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0answers
89 views

ReadyBoost : How a Software Component Helps Boost the System Performance by Exploiting Flash Memory as a Cache?

One of the nice feature of windows 7 for low memory system is ReadyBoost, a software component that uses flash memory as a cache to actually speed up the the performance(Ref-Wikipedia). But If we ...
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2answers
6k views

Tradeoff: CPU Clock Speed vs Cache [closed]

If you had two choices in processors, one with 2.7GHz @ 6M cache, and the other with 3.0GHz @ 4M cache, which do you choose? This is not a shopping question, what I'm looking for is a general rule ...
0
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1answer
116 views

Is CPU cache (L1 - Ln) equal to TLB

If we are talking about CPU cache. Is Ln synonym for saying 'TLB (translation lookaside buffer) of type Ln' or does Ln include also somethin else than just TLB?
3
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1answer
4k views

Why do we need multiple levels of cache memory?

In general a cache memory is useful because the speed of the processor is higher than the speed of the ram (they are both increasing in speed but the difference still remains). So reducing the number ...
3
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2answers
7k views

Too much RAM “in cache”

I am having the following problem: I am having a completely new Notebook with 8 GB RAM and Windows 8. I do not use software that requires a lot of RAM and I do not have a thousand programs running. ...
10
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1answer
18k views

Why is SRAM faster than DRAM?

In modern multi-core processors, the processor caches (L1,L2 and L3) are made up of SRAM with decreasing speeds(L2 caches are higher speed SRAM than L3 caches which is a cost trade-off). The main ...
2
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0answers
55 views

Back of the envelope calculation for speed of matrix multiplications [closed]

I'm trying to develop an intuition for how feasible/scalable machine learning algorithms are. The dominant cost is always matrix multiplications, but there seem to be no readily Google-able resource ...
0
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1answer
72 views

Is it a big downside for a cpu to not report the L1 Cache?

I am reading information for a processorAMD FX-8320 Eight-Core My primary question is why the L1 cache is not in the information. Would this imply that it does not have registers that it can access ...
3
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1answer
30k views

How can I get to know CPU cache size on Windows 7

WMIC CPU command displays a lot of information about the CPUs on a machine. It only displays the information about L3 cache, is there a way to figure out the size of L1 and L2 caches using a command ...
9
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2answers
19k views

L2 and L3 Cache Difference?

While I understand that the computer cache is: A CPU cache is a cache used by the central processing unit of a computer to reduce the average time to access memory. The cache is a smaller, faster ...
1
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1answer
908 views

meaning of files in cpu folder of linux

What's the meaning of files in the folder /sys/devices/system/cpu/cpu0/cache/index0? I see these files in the folder: coherency_line_size number_of_sets shared_cpu_list size ...
0
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1answer
108 views

how to make caches with equal bitline and wordline lengths?

We know to minimize delay of cache structures in microprocessors, the bitline wire length and wordline wire length should be relatively the same. So in other words, cache modules in processors should ...
1
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1answer
694 views

shared L2 in multicore: regarding miss per kilo instruction (MPKI) counting

I am using multicore simulator marss http://marss86.org. I am using 4-core simulation, with shared L2 cache. Each core is run for say, 100M instructions. Since different cores progress at different ...
2
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1answer
904 views

CPU L3 cache miss and hit ratio details

I am on a Linux server with Xeon X7560 CPU. How can I see the CPU L3 cache miss and hit ratio details?
5
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5answers
10k views

Is the cache size or number of cores more important when weighing CPU performance?

I'm shopping for a laptop for my son to use for school, so it doesn't need to be a gaming machine. I've put together PC's from scratch before, but it's been a while. I've noticed that a number of ...
7
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2answers
7k views

What is a processor cache?

I recently downloaded CPU-Z just to check things out, and saw a tab marked Cache on it. It shows what appears to be different memory sizes, and I have seen processors being advertised with an X sized ...
0
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1answer
2k views

Size of L1 cache

Typically, how big is L1 cache today?
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2answers
13k views

Is Cache memory located in the CPU or at the motherboard?

I have a doubt whether cache memory is located in the processor or at the motherboard?
5
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3answers
7k views

L2 Vs. L3 CPU cache speed and performance

In the past few years, looking at Intel CPUs, there has been a move from large size L2 cache to large size L3 cache. A lot of this is due to having more cores on the CPU and wanting to share the cache ...
3
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2answers
203 views

Which property of CPUs is good for what?

Back in the days clock frequency used to be THE criteria to compare CPUs (or perhaps you had to take into account whether it was a DX or SX). The world was simple back then, but in these fast evolving ...
19
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6answers
26k views

Where exactly L1, L2 and L3 Caches located in computer?

Where exactly L1, L2 and L3 Caches Located in computer ? I know, we use Cache to increase performance by picking DATA and INSTRUCTIONS from Cache rather than Main Memory. Following are my questions ...
0
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4answers
695 views

Running programs in cache and registers

In my operating systems class we were shown a picture depicting a hierarchy of memory starting from most expensive and fastest at the top and least expensive and slowest at the bottom. At the very top ...
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2answers
2k views

RAM size > L2 Cache size > L1 Cache size > Internal Registers of a CPU

I understand that the access speed of internal registers is very high compared to that of L1 Cache and L1 Cache can be accessed faster than that of L2 cache which in turn can be accessed faster than ...
17
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5answers
11k views

Why has the size of L1 cache not increased very much over the last 20 years?

The Intel i486 has 8 KB of L1 cache. The Intel Nehalem has 32 KB L1 instruction cache and 32 KB L1 data cache per core. The amount of L1 cache hasn't increased at nearly the rate the clockrate has ...
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4answers
3k views

How do I view the amount of L2 cache in windows?

I know where to find CPU class and speed, and amount of RAM. But I don't see the amount of CPU cache in computer properties or device manager. Does windows (XP currently) provide this information, ...
7
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4answers
11k views

Can I increase the L2 cache memory of my CPU?

I noticed that my laptop seems to have 4x the amount of "L2 cache memory" than my desktop, is that normal? laptop: Intel Core Duo CPU T2450 @ 2.00GHz, L2 cache memory 2 MB, system bus 533 MHz ...