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How does CPU interact with Memory, What all System call being generates during interaction?

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How does CPU interact with Memory, What all System call being generates during interaction?
posted Nov 30, 2014 by Amit Kumar Pandey

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1 Answer

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RAM works in conjunction with the central processing unit (CPU). If RAM is the temporary memory, you can think of the CPU as the brain of the computer. The CPU chip retrieves data from the RAM. The chip takes those instructions and begins to move and process data through the motherboard in the correct order to its next designated location. The CPU runs the computer the same way the human brain performs certain tasks that affect your senses, emotions and abilities to physically move and speak. Without the CPU, your computer will not be able to perform any of the functions it's designed for to keep your computer running efficiently.

For More Details of System Call, Buses Please follow the below link: http://homepage.cs.uri.edu/faculty/wolfe/book/Readings/Reading04.htm

answer Dec 1, 2014 by Kali Mishra
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+3 votes

I have few questions about Cache Memory

1) My understanding of cache memory is, there are 3 type of cache memory,
1. Within RAM
2. Within CPU (L1,L2,L3)
3. Separate Hardware which is costlier than all others.

Please correct if I am wrong,

2) Who stores the data into cache? I mean, can we write a program which should use only cache memory? If yes then how to do it? if no then who manages that?
For example,
Cache memory within RAM, is it managed by Kernel?(Memory Management Unit)
Cache memory within CPU, is it managed by CPU itself?

3) Why cache memory is faster than RAM?

+3 votes

I am using gprof on an HP-UX system for a program compiled with HP's native aCC (using the -G option, which is documented as compatible with gprof).

I get this every time I run gprof on even a small sample gmon.out:

$ gprof  gmon.out > gprof.out    
gprof: out of memory allocating ********** bytes after a total of 15552512 bytes

This works on other HPs we have in house, though I don't have access to them to be able to track down why.

Any clues that might point me in the right direction?

4,294,967,256 seems like an awful lot of memory to handle a 8,647,174 byte gmon.out file....

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