# 2017q1 Homework4 (mergesort-concurrent)
contributed by < `laochanlam` >
###### tags: `laochanlam`

## 開發環境
- Ubuntu 16.10 ( 64 bit )

Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                4
On-line CPU(s) list:   0-3
Thread(s) per core:    2
Core(s) per socket:    2
Socket(s):             1
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 61
Model name:            Intel(R) Core(TM) i7-5500U CPU @ 2.40GHz
Stepping:              4
CPU MHz:               2400.878
CPU max MHz:           3000.0000
CPU min MHz:           500.0000
BogoMIPS:              4788.90
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              4096K
NUMA node0 CPU(s):     0-3

## 相關連結
- [2017 年春季作業說明](https://hackmd.io/s/Bk-1zqIte#)
- [2017q1 Homework4 (作業區)](https://hackmd.io/KwUwhgxgnALADAdgLQDYBMKBGSZgMxxJQjBRIAcKAJigGYxRphhVxA==?view)
- [B08: mergesort-concurrent 作業要求](https://hackmd.io/s/B1xV_p_jl#)
- [課程進度與開放資源 Wiki](http://wiki.csie.ncku.edu.tw/sysprog/schedule)

## 開發紀錄
先把專案 Clone 下來, make 然後執行

$ (for i in {1..8}; do echo $RANDOM; done) | mutrace ./sort 4 8

但是不知道為什麼一直出現 Segmentation fault, 後來看了一下用法

usage: ./sort [thread_count] [input_file]

然後嘗試把 test_data 的 words.txt 丟進去, 得到了很多 0...

該來讀一下程式碼了。

## 補充知識
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#### 參考及引用資料