| // 嵌套 JSON 解析耗时: 491.875µs | |
| // 打平 JSON 解析耗时: 67.083µs | |
| package main | |
| import ( | |
| "encoding/json" | |
| "fmt" | |
| "time" | |
| ) |
| // panic: s should not be WHAT | |
| // goroutine 1 [running]: | |
| // main.main() | |
| // main.go:44 +0x19c | |
| // exit status 2 | |
| // panic: runtime error: invalid memory address or nil pointer dereference | |
| // [signal SIGSEGV: segmentation violation code=0x2 addr=0x7 pc=0x102fa19a4] |
| package main | |
| import ( | |
| "bytes" | |
| "crypto" | |
| "crypto/ecdsa" | |
| "crypto/elliptic" | |
| "crypto/rand" | |
| "crypto/x509" | |
| "crypto/x509/pkix" |
| package main | |
| // Run this in root of https://github.com/vscode-kubernetes-tools/vscode-kubernetes-tools | |
| // `snippets` dir is used. | |
| // Somehow vscode can't show snippets by default. | |
| import ( | |
| "encoding/json" | |
| "fmt" | |
| "io/fs" |
| package main | |
| import ( | |
| "crypto/tls" | |
| "crypto/x509" | |
| "flag" | |
| "io" | |
| "io/ioutil" | |
| "log" | |
| "os" |
| export USERNAME=myadmin | |
| export GROUPNAME=myadmin | |
| export CERTIFICATE_NAME=myadmin | |
| openssl genrsa -out ${USERNAME}.key 2048 | |
| openssl req -new -key ${USERNAME}.key -out ${USERNAME}.csr -subj "/CN=${USERNAME}/O=${GROUPNAME}" | |
| cat <<EOF | kubectl apply -f - | |
| apiVersion: certificates.k8s.io/v1beta1 | |
| kind: CertificateSigningRequest |
Erlang honors cgroup CPU quota from Erlang 23. But when less than 1 CPU is used, schedulers_online will be cores number(see below k8s 0-5).
$ docker run --rm -it --cpu-period 100000 --cpu-quota 100000 erlang:23 bash
root@3f793576001a:/# erl
Erlang/OTP 23 [erts-11.0.2] [source] [64-bit] [smp:4:1] [ds:4:1:10] [async-threads:1] [hipe]
| def read_until_eof(): | |
| buffer = '' | |
| batch_size = 1024 | |
| while True: | |
| ready, _, _ = select.select([sys.stdin], [], [], 0.0) | |
| if sys.stdin not in ready: | |
| continue | |
| # Don't know why, but sys.stdin.read() and sys.stdin.readline() | |
| # will cause EPIPE when writting to stdout |
| #include <stdio.h> | |
| #include <string.h> | |
| #include <sys/mman.h> | |
| #include <unistd.h> | |
| int main(void) { | |
| size_t pagesize = getpagesize(); | |
| printf("System page size: %zu bytes\n", pagesize); |
| defmodule BinaryParseSlow do | |
| def parse(bin) do | |
| parse(bin, 0) | |
| end | |
| def parse(bin, acc) do | |
| case do_parse(bin) do | |
| {:nofin, x, rest} -> | |
| parse(rest, acc + x) | |
| {:fin, x} -> |