Wei Shen wshen0123

wshen0123 / Xeon E5-2699 v4 Dual-Socket Memory Latency Check

Created August 31, 2016 21:34

	Intel(R) Memory Latency Checker - v3.1a
	Measuring idle latencies (in ns)...
	Numa node
	Numa node 0 1
	0 86.8 129.8
	1 129.5 85.9

	Measuring Peak Memory Bandwidths for the system
	Bandwidths are in MB/sec (1 MB/sec = 1,000,000 Bytes/sec)
	Using all the threads from each core if Hyper-threading is enabled

wshen0123 / boostrap-zsh.sh

Last active August 30, 2016 00:27

	sudo apt update
	sudo apt install -y zsh
	sh -c "$(curl -fsSL https://raw.githubusercontent.com/robbyrussell/oh-my-zsh/master/tools/install.sh)"

	mkdir workspace && cd workspace
	git clone http://bitbucket.org/wshen0123/wconf
	cd wconf
	cp -r .zsh* .vim* ~/

wshen0123 / ring.h

Last active May 10, 2016 21:58

rte_ring_lite

	#ifndef _RING_H_
	#define _RING_H_

	#include <rte_ring.h>

	static inline void __attribute__((always_inline))
	ring_sp_enqueue(struct rte_ring r, void *obj_table, uint32_t n)
	{
	uint32_t prod_head, cons_tail;
	uint32_t prod_next, free_entries;

wshen0123 / Scaled Latency Number

Last active September 8, 2016 12:00

	Event Latency Scaled
	1 CPU cycle 0.3 ns 1 s
	Level 1 cache access 0.9 ns 3 s
	Level 2 cache access 2.8 ns 9 s
	Level 3 cache access 12.9 ns 43 s
	Main memory access (DRAM, from CPU) 120 ns 6 min
	Solid-state disk I/O (flash memory) 50-150 us 2-6 days
	Rotational disk I/O 1-10 ms 1-12 months
	Internet: San Francisco to New York 40 ms 4 years
	Internet: San Francisco to United Kingdom 81 ms 8 years