September 2015
Intermediate to advanced
198 pages
4h 52m
English
Content preview from Clojure High Performance Programming - Second Edition
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The latency numbers that every programmer should know
Hardware and software have progressed over the years. Latencies for various operations put things in perspective. The latency numbers for the year 2015, reproduced with the permission of Aurojit Panda and Colin Scott of Berkeley University (http://www.eecs.berkeley.edu/~rcs/research/interactive_latency.html). Latency numbers that every programmer should know are as shown in the following table:
|
Operation |
Time taken as of 2015 |
|---|---|
|
L1 cache reference |
1ns (nano second) |
|
Branch mispredict |
3 ns |
|
L2 cache reference |
4 ns |
|
Mutex lock/unlock |
17 ns |
|
Compress 1KB with Zippy (Zippy/Snappy: http://code.google.com/p/snappy/) |
2μs (1000 ns = 1μs: micro second) |
|
Send 2000 bytes over the commodity network ... |
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