Tetsuo Kiso tetsuok
tetsuok
/ latency.txt
Created
May 31, 2012 17:11
— forked from jboner/latency.txt
Latency numbers every programmer should know
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| L1 cache reference 0.5 ns | |
| Branch mispredict 5 ns | |
| L2 cache reference 7 ns | |
| Mutex lock/unlock 25 ns | |
| Main memory reference 100 ns | |
| Compress 1K bytes with Zippy 3,000 ns | |
| Send 2K bytes over 1 Gbps network 20,000 ns | |
| Read 1 MB sequentially from memory 250,000 ns | |
| Round trip within same datacenter 500,000 ns | |
| Disk seek 10,000,000 ns |
tetsuok
/ foil_optimizer.cpp
Created
February 7, 2016 23:56
— forked from socantre/foil_optimizer.cpp
CppCon 2015: Chandler Carruth "Tuning C++: Benchmarks, and CPUs, and Compilers! Oh My!" functions to disable compiler optimization
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| static void escape(void *p) { | |
| asm volatile("" : : "g"(p) : "memory"); | |
| } | |
| static void clobber() { | |
| asm volatile("" : : : "memory"); | |
| } |