nickva

> recon_trace:calls({fabric, design_docs, fun(_) -> exception_trace() end}, 10, [
          {formatter, fun
              ({trace, _, exception_from, MFA, Err}) -> io_lib:format("|~p:~p|~n", [MFA,Err]);
              ({trace, _, return_from, MFA, {IsOk,_}=Res}) when IsOk =/= ok -> io_lib:format("|~p:~p|n", [MFA,Res]);
              (_) -> ""
          end}
]).

nickva

% ./enc
=ERROR REPORT==== 22-May-2024::15:14:05.001026 ===
beam/beam_load.c(607): Error loading function rebar:log/3: op init y:
  no specific operation found


escript: exception error: undefined function rebar:main/1
  in function  escript:run/2 (escript.erl, line 904)
  in call from escript:start/1 (escript.erl, line 418)
  in call from init:start_it/1

nickva

> json:decode(~"""
   {"a":"b", "c":true, "d":42, "e":1.2, "f":false, "g":null}
   """).
#{<<"a">> => <<"b">>,<<"c">> => true,<<"d">> => 42,
  <<"e">> => 1.2,<<"f">> => false,<<"g">> => null}

nickva

% Benchmark module for ddoc_cache_lru
%
% Benchmark opening and closing (evicting) a bunch of random dbs/ddocs.
%
% Times are measured in microseconds. Best (minimum) results are returned for each
% of the N cases.
%

-module(ddoc_cache_bench).

nickva

% Benchmark module for couch_event_server
%
% Benchmark registering/unregistering N listeners for N dbs. Then benchmark
% sending 10 events from concurrent proceses for each of the Db and measure
% event latency: how long it took for the event to be delivered to the
% listener.
%
% Times are measured in microseconds. Best (minimum) results are returned for each
% of the N cases.
%

nickva

#!/usr/bin/env python

import json
import time
import requests
import string
import random


S = requests.session()

nickva

#!/bin/bash

http -q delete $DB/db
http -q put $DB/db

http post $DB/db/_bulk_docs new_edits:='false' docs:='[{"_id":"d1", "_revisions":{"start":2, "ids":["x", "z"]}, "data":1}, {"_id":"d1", "data":2, "_revisions":{"start":2, "ids":["y", "z"]}}, {"_id":"d1", "data":3, "_deleted":true, "_revisions":{"start":2, "ids":["w", "z"]}}]'
http -q put $DB/db/d1/att2y'?rev=2-y' data=2y
http -q put $DB/db/d1/att2x'?rev=2-x' data=2x

echo "Without a filter with atts"

nickva

#!/usr/bin/env python
#
# make && ./dev/run -n 1 --admin=adm:pass
# ./multiuser.py --users-scheme=simple --users-salt="abc" --users-hash-sha1 --tries 100

import copy
import sys
import time
import threading
import os

nickva

%
% $ erl -name otp252@127.0.0.1
% > c(distblockleak).
%
% $ erl -name otp251@127.0.0.1
% > c(distblockleak), distblockleak:go('otp252@127.0.0.1', "./junk.bin", 10000, 100, 200).
%

-module(distblockleak).

nickva

%% Reproducer attempt for https://github.com/erlang/otp/issues/7801
%% It's supposed to model the couch_file.erl from Apache CouchDB
%%
%% Example run:
%%   c(ioblock), ioblock:go("./junk.bin", 8192, 60, 4000).
%%   - Create a temporary junk.bin file with 8GB of random data
%%   - Spawn 60 gen_servers to handle preads from the file
%%   - Spawn 4000 caller processes to call the servers with pread commands
%%
%% Note: run the first time without measuring to create the larger file.