In a paging system, it takes 30 ns to search translation Look-aside Buffer (TLB) and 90 ns to access the main memory. If the TLB hit ratio is 70%, the effective memory access time is: (1) 48 ns (2) 147 ns (3) 120 ns (4) 84 ns

In a paging system, it takes 30 ns to search translation Look-aside Buffer (TLB) and 90 ns to access the main memory. If the TLB hit ratio is 70%, the effective memory access time is: (1) 48 ns (2) 147 ns (3) 120 ns (4) 84 ns
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Translation Look-aside Buffer(TLB) is (A) a cache-memory in which item to be searched is compared one-by-one with the keys. (B) a cache-memory in which item to be searched is compared with all the keys simultaneously. (C) an associative memory in which item to be searched is compared one-by-one with the keys. (D) an associative memory in which item to be searched is compared with all the keys simultaneously.

Description : Translation Look-aside Buffer(TLB) is (A) a cache-memory in which item to be searched is compared one-by-one with the keys. (B) a cache-memory in which item to be searched is compared with ... keys. (D) an associative memory in which item to be searched is compared with all the keys simultaneously.

Last Answer : (D) an associative memory in which item to be searched is compared with all the keys simultaneously.

In a demand paging memory system, page table is held in registers. The time taken to service a page fault is 8 m.sec. if an empty frame is available or if the replaced page is not modified, and it takes 20 m.secs., if the replaced page is modified. What is the average access time to service a page fault assuming that the page to be replaced is modified 70% of the time ? (A) 11.6 m.sec. (B) 16.4 m.sec. (C) 28 m.sec. (D) 14 m.sec.

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Last Answer : (B) 16.4 m.sec. 

The virtual address generated by a CPU is 32 bits. The Translation Lookaside Buffer (TLB) can hold total 64 page table entries and a 4-way set associative (i.e. with 4- cache lines in the set). The page size is 4 KB. The minimum size of TLB tag is (A) 12 bits (B) 15 bits (C) 16 bits (D) 20 bits

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Last Answer : (C) 16 bits Explanation: VirtualAddress = 32 bits PageSize = 4KB = 12 bits therefore : VPNTag = 20 bits, OffsetTag = 12 bits TLBEntryLength = VPNTag = 20 bits TotalTLBEntries = 64, 4-way implies ... therefore : TLBIndex = 4 bits TLBTag = TLBEntryLength - TLBIndex = 20 - 4 = 16 bits

Let the page fault service time be 10 millisecond(ms) in a computer with average memory access time being 20 nanosecond(ns). If one page fault is generated for every 106 memory accesses, what is the effective access time for memory? (A) 21 ns (B) 23 ns (C) 30 ns (D) 35 ns

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Description : Define Translation-Lookaside Buffer (TLB)?

Last Answer : Most commercial virtual memory systems incorporate a mechanism that can avoid the bulk of the main memory access called for by the virtual to physical addresses translation buffer. This may be done with a cache memory called a translation buffer, which retains the results of the recent translation.

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Last Answer : (C) It is a chip to map virtual address to physical address

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The diameter of a roller is 84 cm and its length is 120 cm. It takes 500 complete revolutions to move once over to level a playground. Find the area of the playground in m2. -Maths 9th

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Last Answer : a) 0.471 and 1.19 Hz

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Last Answer : a) 0.471 and 1.19 Hz

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Last Answer : d. Address register

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Last Answer : Answer: D

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Last Answer : A) True, True

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Description : P and Q finished a work in 36 days; Q and R can do it in 60 days; P and R can do it in 45 days. In what time can P alone do it. a) 30 days b) 60 days c) 90 days d) 120 days

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After how many days of absence from Parliament without permission can a M.P. be disqualified? (1) 30 days (2) 60 days (3) 90 days (4) 120 days

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The distance between node and adjacent antinodes is 30 cm. The wavelength is - (1) 30 cm. (2) 90 cm. (3) 120 cm. (4) 60 cm.

Description : The distance between node and adjacent antinodes is 30 cm. The wavelength is - (1) 30 cm. (2) 90 cm. (3) 120 cm. (4) 60 cm.

Last Answer : (4) 60 cm. Explanation: A node is a point along a standing wave where the wave has minimal amplitude. The opposite of a node is an anti-node, a point where the amplitude of the standing wave is a maximum.