Jim Shu cwshu

Other ID: cwshu, susu

cwshu / latency.txt

Created May 31, 2017 09:04 — forked from jboner/latency.txt

Latency Numbers Every Programmer Should Know

	Latency Comparison Numbers
	--------------------------
	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

cwshu / profiling netperf on KVM using perf tool

Created September 16, 2017 15:43 — forked from oraccha/profiling netperf on KVM using perf tool

	experimental setting
	- 192.168.1.1: host OS
	- 192.168.1.10: guest OS
	- 192.168.1.2: remote machine's OS

	sender side
	192.168.1.10$ netperf -H 192.168.1.2 -c -C -l 70
	TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.1.2 (192.168.1.2) port 0 AF_INET : demo
	Recv Send Send Utilization Service Demand
	Socket Socket Message Elapsed Send Recv Send Recv