Q5. Consider a memory system where all pages fit in memory. The TLB takes 15 nanoseconds...
Q5. Consider a memory system where all pages fit in memory. The TLB takes 15 nanoseconds to access and memory takes 120 nanoseconds to access.
What is the effective access time for 1 level paging if the hit rate is 65%? What if it’s 95%?
What is the effective access time if not all processes fit into memory and the swap time is 850,000 nanoseconds for a page fault?
Homework Answers
Add Answer to:
Q5. Consider a memory system where all pages fit in memory. The
TLB takes 15 nanoseconds...
3. Consider a paging system with the page table in memory. A. If a memory reference takes 100 nanoseconds, how long does...
3. Consider a paging system with the page table in memory. A. If a memory reference takes 100 nanoseconds, how long does a paged memory reference take? B. If we add TLBs, and 75 percent of all page-table references are found in the TLBs, what is the effective memory reference time? (Assume that finding a page-table entry for the TLBs takes 20 nanoseconds.) C. It takes 750 milliseconds to service a page fault. The page fault rate is .001. What...
3. Consider a paging system with the page table in memory. A. If a memory reference...
3. Consider a paging system with the page table in memory. A. If a memory reference takes 100 nanoseconds, how long does a paged memory reference take? B. If we add TLBs, and 75 percent of all page-table references are found in the TLBs, what is the effective memory reference time? (Assume that finding a page-table entry for the TLBs takes 20 nanoseconds.) C. It takes 750 milliseconds to service a page fault. The page fault rate is .001. What...
If the page fault rate is given by F, and the TLB hit rate is given...
If the page fault rate is given by F, and the TLB hit rate is
given by H. Both F & H are in the range [0,1]. Give a formula
for the effective memory access time of a paging system if the
normal memory access time is N, and the time it takes to serve the
page fault (i.e. to read the page from disk and update the page
able) is T, and the time it takes to read the...
7 pts Question 30 Consider a computer system that uses virtual memory with paging with a...
7 pts Question 30 Consider a computer system that uses virtual memory with paging with a TLB. Suppose main memory access time is 10 ns and the time to look up the TLB 1 ns. Assume no page faults and the TLB has a hit of 95%. What is the effective memory access time (express in ns) 11ns
Question 30 7 pts Consider a computer system that uses virtual memory with paging with a...
Question 30 7 pts Consider a computer system that uses virtual memory with paging with a TUB. Suppose main memory access time is 10 ns and the time to look up the TLB 1 ns. Assume no page faults and the TLB has a hit of 95%. What is the effective memory access time (express in ns)
A computer uses virtual memory implemented by paging. The TLB lookup takes 100 ns and the...
A computer uses virtual memory implemented by paging. The TLB lookup takes 100 ns and the update takes 200 ns. The PT lookup takes 1 µs and the update takes 2 µs. Loading a word from main memory onto the CPU takes 10 µs and loading a page from the disk into main memory takes 10 ms. The TLB hit ratio is 0.4 and the main memory hit ratio is 0.3. Compute the average access time for a referenced word:...
2. A computer uses virtual memory implemented by paging. The TLB lookup takes 150 ns and...
2. A computer uses virtual memory implemented by paging. The TLB lookup takes 150 ns and the update takes 300 ns. The PT lookup takes 2 us and the update takes 4 us. Loading a word from main memory onto the CPU takes 25 us and loading a page from the disk into main memory takes 20 ms. The TLB hit ratio is 0.3 and the main memory hit ratio is 0.4. Compute the average access time for a referenced...
4. Assume it take 50 nanoseconds to resolve a memory reference when accessing the physical memory address directly. a) We designed a system using virtual addresses with page tables without a TLB. In...
4. Assume it take 50 nanoseconds to resolve a memory reference when accessing the physical memory address directly. a) We designed a system using virtual addresses with page tables without a TLB. In other words, when fetching data from memory, the page table is accessed to get the PTE for translating an address, a translation is completed, and finally, a memory reference to the desired data is resolved. In this system, what is the effective memory reference time. Assume the...
21. A system has the following characteristics: Memory Access (read/write) : 50ns disk access : 20ms...
21. A system has the following characteristics: Memory Access (read/write) : 50ns disk access : 20ms TLB access : 10ns TLB hit ratio : 90% page fault ratio : 5% You may assume that all page faults require a block to be written. For this system, calculate effective memory access time assuming that 2level paging is used. Show your work.
Question # 3 Consider a demand-paged system where the page table for each process resides in main...
Question # 3 Consider a demand-paged system where the page table for each process resides in main memory. In addition, there is a fast associative memory (also known as TLB which stands for Translation Look-aside Buffer) to speed up the translation process. Each single memory access takes 1 microsecond while each TLB access takes 0.2 microseconds. Assume that 2% of the page requests lead to page faults, while 98% are hits. On the average, page fault time is 20 milliseconds...
If the page fault rate is given by F, and the TLB hit rate is
given by H. Both F & H are in the range [0,1]. Give a formula
for the effective memory access time of a paging system if the
normal memory access time is N, and the time it takes to serve the
page fault (i.e. to read the page from disk and update the page
able) is T, and the time it takes to read the...
7 pts Question 30 Consider a computer system that uses virtual memory with paging with a TLB. Suppose main memory access time is 10 ns and the time to look up the TLB 1 ns. Assume no page faults and the TLB has a hit of 95%. What is the effective memory access time (express in ns) 11ns
Question 30 7 pts Consider a computer system that uses virtual memory with paging with a TUB. Suppose main memory access time is 10 ns and the time to look up the TLB 1 ns. Assume no page faults and the TLB has a hit of 95%. What is the effective memory access time (express in ns)
2. A computer uses virtual memory implemented by paging. The TLB lookup takes 150 ns and the update takes 300 ns. The PT lookup takes 2 us and the update takes 4 us. Loading a word from main memory onto the CPU takes 25 us and loading a page from the disk into main memory takes 20 ms. The TLB hit ratio is 0.3 and the main memory hit ratio is 0.4. Compute the average access time for a referenced...
4. Assume it take 50 nanoseconds to resolve a memory reference when accessing the physical memory address directly. a) We designed a system using virtual addresses with page tables without a TLB. In other words, when fetching data from memory, the page table is accessed to get the PTE for translating an address, a translation is completed, and finally, a memory reference to the desired data is resolved. In this system, what is the effective memory reference time. Assume the...
Question # 3 Consider a demand-paged system where the page table for each process resides in main memory. In addition, there is a fast associative memory (also known as TLB which stands for Translation Look-aside Buffer) to speed up the translation process. Each single memory access takes 1 microsecond while each TLB access takes 0.2 microseconds. Assume that 2% of the page requests lead to page faults, while 98% are hits. On the average, page fault time is 20 milliseconds...
Most questions answered within 3 hours.
-
Our ability to see distinct edges as well as our errors in
contrast perceptions (e.g., seeing...
asked 36 seconds from now -
you want to measure the gravitational acceleration at your
location. since g does not vary significantly...
asked 13 minutes ago -
Aside from commercial tools that are specifically geared toward
TAR/PC( Technology-Assisted Review), are there potential
alternative...
asked 15 minutes ago -
A woman expends 94 kJ of energy in walking a kilometer. The
energy is supplied by...
asked 7 minutes ago -
the period of a pendulum on earth is 5 seconds. what will be the
period of...
asked 31 minutes ago -
The
act of turning media against itself, such as flash mobs and
billboard is called
a....
asked 26 minutes ago -
A set of length measurements are obtained with the values 165.6
± 0.3, 165.1± 0.4,166.4± 1.0,...
asked 28 minutes ago -
Vertical Analysis
Income statement information for Einsworth Corporation
follows:
Sales
$237,000
Cost of goods sold
78,210...
asked 34 minutes ago -
A simple random sample was taken to test the claim that the
population mean is no...
asked 29 minutes ago -
Overview
JAVA LANGUAGE PROBLEM:
The owner of a restaurant wants a program to manage online
orders...
asked 35 minutes ago -
1- What is “progressive production?”
2- Where did the assembly line originate? (Name the industry)
3....
asked 32 minutes ago -
NPV
Project L costs $60,000 it’s expected cash inflows are $13,000
per year for 10 years,...
asked 37 minutes ago