The following table shows the core map (having more information than page table) of a virtual memory system at time t, which has a page size of 1000 bytes. Process ID Page # 1 2 2 1 3 1 1 1 2 3 1 2 2 6 3 7 To which physical address does virtual address 1017 of process 2 map? [If the page is not in the main memory, please choose 'does not map'] 10 O e. 2017 2 O a. 4017 O b. does not map O c. 3017 O d. 5017 Frame # 10 1 2 3 4 5

Database System Concepts
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Chapter1: Introduction
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### Core Map Table for Virtual Memory System

The table below provides information about the core map of a virtual memory system at a specific time \( t \). The system has a page size of 1000 bytes.

#### Core Map Table
| Process ID | Page # | Frame # |
|------------|--------|---------|
| 1          | 1      | 0       |
| 1          | 2      | 1       |
| 2          | 2      | 2       |
| 3          | 1      | 3       |
| 1          | 3      | 4       |
| 2          | 1      | 5       |
| 2          | 0      | 6       |
| 3          | 2      | 7       |

#### Question
To which physical address does virtual address 1017 of process 2 map? 
[If the page is not in the main memory, please choose 'does not map']

#### Options
a. 4017

b. does not map

c. 3017

d. 5017

e. 2017

To solve this question, identify the page portion and the offset portion of the virtual address. Given the virtual address 1017 for process 2:

1. Calculate the page number and offset:
   - Page number: 1 (since 1017 / 1000 = 1 with remainder 17)
   - Offset: 17

2. Look up the frame number of Process ID 2, Page #1 from the core map table:
   - Frame number: 5

3. Calculate the physical address by combining the frame number and the offset:
   - Physical Address = (Frame Number * Page Size) + Offset
   - = (5 * 1000) + 17
   - = 5017

Therefore, the correct answer is:
d. 5017
Transcribed Image Text:### Core Map Table for Virtual Memory System The table below provides information about the core map of a virtual memory system at a specific time \( t \). The system has a page size of 1000 bytes. #### Core Map Table | Process ID | Page # | Frame # | |------------|--------|---------| | 1 | 1 | 0 | | 1 | 2 | 1 | | 2 | 2 | 2 | | 3 | 1 | 3 | | 1 | 3 | 4 | | 2 | 1 | 5 | | 2 | 0 | 6 | | 3 | 2 | 7 | #### Question To which physical address does virtual address 1017 of process 2 map? [If the page is not in the main memory, please choose 'does not map'] #### Options a. 4017 b. does not map c. 3017 d. 5017 e. 2017 To solve this question, identify the page portion and the offset portion of the virtual address. Given the virtual address 1017 for process 2: 1. Calculate the page number and offset: - Page number: 1 (since 1017 / 1000 = 1 with remainder 17) - Offset: 17 2. Look up the frame number of Process ID 2, Page #1 from the core map table: - Frame number: 5 3. Calculate the physical address by combining the frame number and the offset: - Physical Address = (Frame Number * Page Size) + Offset - = (5 * 1000) + 17 - = 5017 Therefore, the correct answer is: d. 5017
### Code Skeleton and Memory Segmentation

#### Given a code skeleton as follows:
```cpp
int a = 1;
char* p;

int main() {
    int i;
    p = (char*)malloc(100);

    ...
    ...

    i = f1(a, p[99]);

    ...
    ...
}
```

After the code is compiled and launched by the user, the OS will create the address space for this process. Based on your understanding of the code and its execution, answer the following questions:

**Questions:**

1. **Variable a is stored in the** `____` **segment, i is stored in the** `____` **segment of the process' address space, while** `the instructions` **of the process are stored in the** `____` **segment of the process’ address space**.

2. **For variable p, it is stored in the** `____` **segment and p[99] is stored in the** `____` **segment of the process' address space. When function f1 is called, variable p[99] is copied into** `____` **segment of the address space**.

3. **There is(are) total** `____` **process(es) created by the OS when the above program is launched**.

**Answer Boxes with Options:**
- data, stack, text, heap, data, stack, text, heap, data, stack, text, heap, data, stack, text, heap, data, stack, text, heap, data, stack, text, heap

**User Interface Elements:**

1. **Time Display**
   - Red box at the top-right corner indicating remaining time: **"Time left 1:31:54"**

The correct options can be selected from the buttons labeled with the appropriate segment names to complete the answer for each question. Here is the rest of the given information and placeholders for responses to guide you through analyzing and understanding memory segmentation in operating systems.

**Options to Drag and Drop (represented as buttons below the questions):**
- data
- stack
- text
- heap

Use these options to fill in the blanks for each question appropriately.
Transcribed Image Text:### Code Skeleton and Memory Segmentation #### Given a code skeleton as follows: ```cpp int a = 1; char* p; int main() { int i; p = (char*)malloc(100); ... ... i = f1(a, p[99]); ... ... } ``` After the code is compiled and launched by the user, the OS will create the address space for this process. Based on your understanding of the code and its execution, answer the following questions: **Questions:** 1. **Variable a is stored in the** `____` **segment, i is stored in the** `____` **segment of the process' address space, while** `the instructions` **of the process are stored in the** `____` **segment of the process’ address space**. 2. **For variable p, it is stored in the** `____` **segment and p[99] is stored in the** `____` **segment of the process' address space. When function f1 is called, variable p[99] is copied into** `____` **segment of the address space**. 3. **There is(are) total** `____` **process(es) created by the OS when the above program is launched**. **Answer Boxes with Options:** - data, stack, text, heap, data, stack, text, heap, data, stack, text, heap, data, stack, text, heap, data, stack, text, heap, data, stack, text, heap **User Interface Elements:** 1. **Time Display** - Red box at the top-right corner indicating remaining time: **"Time left 1:31:54"** The correct options can be selected from the buttons labeled with the appropriate segment names to complete the answer for each question. Here is the rest of the given information and placeholders for responses to guide you through analyzing and understanding memory segmentation in operating systems. **Options to Drag and Drop (represented as buttons below the questions):** - data - stack - text - heap Use these options to fill in the blanks for each question appropriately.
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