Three Cs model指的是我們可以將所有cache miss歸類成三大類：
1. Compulsory misses
2. Capacity misses
3. Conflict misses
1. Compulsory misses
2. Capacity misses
3. Conflict misses
- 8月 31 週二 201021:53
cache miss types
- 8月 24 週二 201014:48
Message Queue
IPC:Message Queues:<sys/msg.h>Two (or more) processes can exchange information via access to a common
system message queue.
- 8月 24 週二 201013:54
Shared Memory
Shared Memory is an efficeint means of passing data between
programs. One program will create a memory portion which other
processes (if permitted) can access.
programs. One program will create a memory portion which other
processes (if permitted) can access.
- 8月 23 週一 201011:44
Pipe
1. This is pipe2.c. It start rather like the first examples, up until we make the call to fork.
UNIX allows two ways of opening a pipe:
- 8月 23 週一 201011:40
Inter-Process Communication
We have now began to see how multiple processes may be running on a
machine and maybe be controlled (spawned by fork() by one of our
programs.
- 5月 11 週二 201016:21
ParallelTracer Status
pac dsp頻率：264MHZ
handler 在pac duo 上arm端以及dsp端收集data無誤（文字檔），binary不確定
handler 在pac duo 上arm端以及dsp端收集data無誤（文字檔），binary不確定
- 4月 27 週二 201013:41
POSIX Thread- Overview
The POSIX thread libraries are a standards based thread API for C/C++.
It allows one to spawn a new concurrent process flow. It is most effective
on multi-processor or multi-core systems where the process flow can be scheduled to run on
another processor thus gaining speed through parallel or distributed processing.
Threads require less overhead than "forking" or spawning a new process because
the system does not initialize a new system virtual memory space and environment for
the process.
While most effective on a multiprocessor system, gains are
also found on uniprocessor systems which exploit latency in I/O and other
system functions which may halt process execution. (One thread may execute
while another is waiting for I/O or some other system latency.)
Parallel programming technologies such as MPI and PVM are used in a distributed
computing environment while threads are limited to a single computer system.
All threads within a process share the same address space.
A thread is spawned by defining a function and its arguments which will
be processed in the thread.
The purpose of using the POSIX thread library in your software is
to execute software faster.
It allows one to spawn a new concurrent process flow. It is most effective
on multi-processor or multi-core systems where the process flow can be scheduled to run on
another processor thus gaining speed through parallel or distributed processing.
Threads require less overhead than "forking" or spawning a new process because
the system does not initialize a new system virtual memory space and environment for
the process.
While most effective on a multiprocessor system, gains are
also found on uniprocessor systems which exploit latency in I/O and other
system functions which may halt process execution. (One thread may execute
while another is waiting for I/O or some other system latency.)
Parallel programming technologies such as MPI and PVM are used in a distributed
computing environment while threads are limited to a single computer system.
All threads within a process share the same address space.
A thread is spawned by defining a function and its arguments which will
be processed in the thread.
The purpose of using the POSIX thread library in your software is
to execute software faster.
- 4月 27 週二 201010:39
電腦開機流程
1. 載入BIOS (Basic Input Output System) 的硬體資訊與進行自我測試，依據設定取得第一個可開機的裝置 (CD-ROM, Hard disk, floopy)2. 讀取並且執行第一個開機裝置內MBR (Master Boot Record)的boot loader (也就是grub , LILO, spfdisk...etc)
3. 依據boot loader設定載入kernel , kernel 會偵測硬體與載入driver
4. driver 運作後，kernel 會主動呼叫init程式, 而init 會取的run-level 資訊
- 4月 20 週二 201011:06
ParallelTrace Source Code (Converter)
1. link_list_utils.c
2. otf_handle.c
3. trace2comm.c
產生call graph
2. otf_handle.c
3. trace2comm.c
產生call graph
Goal：
提供使用者在異質多核心平台上撰寫平行程式的API，以cell為例，在cell上撰寫程式是相對困難的 (MPMD Model) ，因此，實作MPI Standard以減低撰寫的困難度及移植程式的困難度
提供使用者在異質多核心平台上撰寫平行程式的API，以cell為例，在cell上撰寫程式是相對困難的 (MPMD Model) ，因此，實作MPI Standard以減低撰寫的困難度及移植程式的困難度
