Content

1 syntax and semantic

2 example set

1 syntax and semantic

1.1 extending C

Peril-L notation stands on the shoulder of C.

1.2 parallel threads

forall(<intVar in (<index range specification>)){
    <body>
}

1.3 synchronized and coordination

(1) exclusive block

exclusive { <body> }

(2) barrier

近在forall中使用。

barrier

1.4 memory model

2 address spaces: global, local

全局内存存在并发读写、延迟（λ）。

全局-本地映射函数

(1) localize()

根据进程id，返回生成本地数据副本

(2) mysize(global, i)

返回进程Pi中数据的数量

(3) localToGlobal(localData, i, j)

返回Pi的局部数据中索引为i的数据相应的全局索引

1.5 synchronized memory

FE（full/empty）变量，必须是global数据，记法示例：

int t' = 0;
FE state transfer
state\operation read write
empty stall(blocking) => full
full => empty stall(blocking)

1.6 reduce and scan

Reduce(/)

Scan(\)

sample:

+/count   // count is an array, return the sum of count's element
min\items // item is an array, return the minimal of items' element

2 example set

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