yougg

set http or socks proxy environment variables

# set http proxy
export http_proxy=http://PROXYHOST:PROXYPORT

# set http proxy with user and password
export http_proxy=http://USERNAME:PASSWORD@PROXYHOST:PROXYPORT

# set http proxy with user and password (with special characters)

davideicardi

Cloudera quick start with docker

This installation of Cloudera is for development only, do not use it in production.

Getting the image

Download cloudera docker image from https://www.cloudera.com/downloads/quickstart_vms/5-13.html

See also. https://www.cloudera.com/documentation/enterprise/5-13-x/topics/quickstart_docker_container.html

ofirmakmal

apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
  name: kubernetes-dashboard
  labels:
    k8s-app: kubernetes-dashboard
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin

j9ac9k

def gauss(A):
    m = len(A)
    assert all([len(row) == m + 1 for row in A[1:]]), "Matrix rows have non-uniform length"
    n = m + 1
    
    for k in range(m):
        pivots = [abs(A[i][k]) for i in range(k, m)]
        i_max = pivots.index(max(pivots)) + k
        
        # Check for singular matrix

danidiaz

Papers

Time clock and the ordering of events in a distributed system

Consensus on Transaction Commit

An empirical study on the correctness of formally verified distributed systems

Byzantizing Paxos by Refinement

arsham

go test -run=. -bench=. -benchtime=5s -count 5 -benchmem -cpuprofile=cpu.out -memprofile=mem.out -trace=trace.out ./package | tee bench.txt
go tool pprof -http :8080 cpu.out
go tool pprof -http :8081 mem.out
go tool trace trace.out

go tool pprof $FILENAME.test cpu.out
# (pprof) list <func name>

# go get -u golang.org/x/perf/cmd/benchstat
benchstat bench.txt

jboner

Latency Comparison Numbers (~2012)
----------------------------------
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