Numbers every computer scientist should know Flashcards by Tehsin Syed | Brainscape

Q

L1 Cache Reference

A

0.5ns

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Q

Branch Mispredict

A

5ns

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Q

L2 Cache Reference

A

7ns

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Q

Mutex Lock/Unlock

A

25ns

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Q

Main Memory Reference

A

100ns

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Q

Compress 1Kb with Zippy

A

3,000ns/0.03ms

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Q

Send 2Kb over 1Gbps network

A

20,000ns/0.02ms

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Q

Read 1Mb sequentially from memory

A

250,000ns/0.25ms

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Q

Roundtrip w/in same datacenter

A

500,000ns/0.5ms

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Q

Disk Seek

A

10,000,000ns/10ms

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Q

Read 1Mb sequentially from network

A

10,000,000ns/10ms

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Q

Read 1Mb sequentially from disk

A

30,000,000ns/30ms

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Q

Send packet CA->Netherlands->CA

A

150,000,000/150ms

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Q

SSD random read

A

150,000ns/0.15ms

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Q

Read 1 MB sequentially from SSD*

A

1,000,000ns/1ms

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