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Latency Comparison Numbers (~2012) | |
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L1 cache reference 0.5 ns | |
Branch mispredict 5 ns | |
L2 cache reference 7 ns 14x L1 cache | |
Mutex lock/unlock 25 ns | |
Main memory reference 100 ns 20x L2 cache, 200x L1 cache | |
Compress 1K bytes with Zippy 3,000 ns 3 us | |
Send 1K bytes over 1 Gbps network 10,000 ns 10 us | |
Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD |
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async function asyncFlatMap (arr, asyncFn) { | |
return Promise.all(flatten(await asyncMap(arr, asyncFn))) | |
} | |
function asyncMap (arr, asyncFn) { | |
return Promise.all(arr.map(asyncFn)) | |
} | |
function flatMap (arr, fn) { | |
return flatten(arr.map(fn)) |