Nodejs Shared Memory Cache

Usage

``typescript
import { ShmCache } from 'node-share-memory-cache';

const cache = new ShmCache({
name: 'CacheNameV1',
size: 1024 1024 10,
maxSize: 1024 1024 100,
});

// set cache with ttl
cache.set('key','value', 1000 60 5);
// get cache
const value = cache.get('key');
// delete key
cache.del('key');


``

API

1. get/set with key , base data operation
2. setMaxAge , set max age for data expire,default 2000ms
3. setMaxSize , set max memory allocation size, default 800MB

memory allocation

$3

1. [0,4MB] auto grow x2
2. [4MB-400MB] auto grow 400KB
3. [400MB,inf] auto grow 4MB
4. and custome grow

$3

when clean up, and free memory more than 40MB
shrink to fit the size of data

read/write lock

1. read with shared lock
2. write with exclusive lock
3. no timeout lock support (toto later add)
4. memory grow/shrink with exclusive lock

benchmark

5 child process , read only, macbook pro

!read_only

5 child process , read+write, macbook pro

!write_only

5 child process , read first, macbook pro

!write_only

5 child process , write first, win64 i5-12490

!img.png