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ep:teme:01 [2026/03/04 14:14] radu.mantu |
ep:teme:01 [2026/03/04 14:35] (current) radu.mantu [Memory access tracing] |
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| ====== Assignment ====== | ====== Assignment ====== | ||
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| - | <hidden> | ||
| ===== 01. Overview ===== | ===== 01. Overview ===== | ||
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| ==== Partner up ==== | ==== Partner up ==== | ||
| - | Select a partner for this assignment and submit your choice via [[https://forms.gle/unnN3f8pksSbg85g9|this form]]. | + | Select a partner for this assignment and submit your choice via [[https://forms.gle/unnN3f8pksSbg85g9|this form]]. \\ |
| + | If you can't find a partner, try advertising on the [[https://curs.upb.ro/2025/mod/forum/discuss.php?d=3902|assignment forum]]. | ||
| <note important> | <note important> | ||
| - | Only one student is required to complete the form on behalf of the team. | + | Only one student is required to complete the form on behalf of the team.\\ |
| - | + | Only one student (not necessarily the same) will have to upload the assignment on moodle.\\ | |
| - | Only one student (not necessarily the same) will have to upload the assignment on moodle. | + | |
| You are **required** to work with a partner on this assignment. | You are **required** to work with a partner on this assignment. | ||
| </note> | </note> | ||
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| ==== Usage ==== | ==== Usage ==== | ||
| - | Your application should be implemented in C/C++ and take as positional arguments the commandline invocation of the program under test. For example, ''./my_tracer curl http://example.com'' will launch the tracer program that will then fork() & exec() **curl** and start monitoring its memory transactions at the same time. In case you need to add flags to your application, you can separate them from the child process' commandline with ''%%--%%''. | + | Your application should be implemented in C/C++ and take as positional arguments the commandline invocation of the program under test. For example, ''./my_tracer curl http://example.com'' will launch the tracer program that will then fork() & exec() **curl** and start monitoring its memory transactions at the same time. In case you need to add flags to your application, you can separate them from the commandline of the child process with ''%%--%%''. |
| ==== Memory access tracing ==== | ==== Memory access tracing ==== | ||
| - | Once the child process is up and running, you will have to monitor the **read** and **write** operations //separately//. Specifically, you will have to determine **what address has been accessed** and **what instruction has performed this access**. This can be achieved using [[https://www.intel.com/content/www/us/en/developer/articles/technical/timed-process-event-based-sampling-tpebs.html|Intel Processor Event Based Sampling (PEBS)]], a mode of operation that will write detailed sample information in a physical memory ring buffer whenever the event counter triggers. You will not be required to interact with this system directly, but instead utilize the [[https://man.archlinux.org/man/perf_event_open.2.en#MMAP_layout|sampled mode]] of Linux Perf Events. | + | Once the child process is up and running, you will have to monitor the **read** and **write** operations //separately//. Specifically, you will have to determine **what address has been accessed** and **what instruction performed this access**. This can be achieved using [[https://www.intel.com/content/www/us/en/developer/articles/technical/timed-process-event-based-sampling-tpebs.html|Intel Processor Event Based Sampling (PEBS)]], a mode of operation that will write detailed sample information in a physical memory ring buffer whenever the event counter triggers. You will not be required to interact with this system directly, but instead utilize the [[https://man.archlinux.org/man/perf_event_open.2.en#MMAP_layout|sampled mode]] of Linux Perf Events. |
| ==== Mapping addresses to objects ==== | ==== Mapping addresses to objects ==== | ||
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| ===== Grading ===== | ===== Grading ===== | ||
| - | The deadline for this assignment is **11 May**. Upload a **zip archive** containing the source code, Makefile, documentation and any **micro-benchmarks** used in testing (don't go and include **redis** in your submission). The archive should be uploaded to this **moodle assignment (TODO)**. | + | The deadline for this assignment is **11 May**. Upload a **zip archive** containing the source code, Makefile, documentation and any **micro-benchmarks** used in testing (don't go and include **redis** in your submission). The archive should be uploaded to this [[https://curs.upb.ro/2025/mod/assign/view.php?id=135330|moodle assignment]]. |
| - | This assignment is worth **??p** of your final grade. The breakdown by task is as follows: | + | This assignment is worth **1.5p** of your final grade. The breakdown by task is as follows: |
| * **Memory access tracing (30%):** If nothing else, the application can provably monitor memory accesses by printing the relevant information to //stdout//. | * **Memory access tracing (30%):** If nothing else, the application can provably monitor memory accesses by printing the relevant information to //stdout//. | ||
| * **Mapping addresses to objects (30%):** The application should be able to generate statistics for both accessed data regions and code regions performing the accesses. Reads and writes must be treated separately. | * **Mapping addresses to objects (30%):** The application should be able to generate statistics for both accessed data regions and code regions performing the accesses. Reads and writes must be treated separately. | ||
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| <note important> | <note important> | ||
| The **first pair** that submits an assignment that receives **full marks** will automatically pass the exam with a maximum grade. | The **first pair** that submits an assignment that receives **full marks** will automatically pass the exam with a maximum grade. | ||
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| - | Up to **??p** bonus points can be awarded at the discretion of the teaching assistants for an exceptional implementation or evaluation. | ||
| </note> | </note> | ||
| - | </hidden> | + | ===== FAQ ===== |
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| + | :?: | ||
