File examples/stress/stress artifact ed9cc0294e part of check-in dc7dc994d9

#! /usr/bin/env tclsh

## -- INIT
set threadInit {
	package require Thread
	package require sqlite3
	package require nano

	set ::sqlFilename [file join [pwd] blocks.db]
	if {[info exists ::initDB]} {
		file delete -force $::sqlFilename
	}

	sqlite3 db $::sqlFilename

	proc processBlockWorker {orderID block} {
		set block [::nano::block::json::work $block -update]
		db eval {INSERT INTO blocks (orderID, blockJSON) VALUES ($orderID, $block);}
	}
}

set ::initDB true
uplevel #0 $threadInit

set iterationCount 1

db eval {
	PRAGMA journal_mode = MEMORY;
	CREATE TABLE blocks (orderID INTEGER PRIMARY KEY, blockJSON TEXT NOT NULL);
}

## -- PROCESSES
proc numberOfThreads {} {
	# Windows puts it in an environment variable
	if {[info exists ::env(NUMBER_OF_PROCESSORS)]} {
		return $::env(NUMBER_OF_PROCESSORS)
	    }

	# Check for sysctl (OSX, BSD)
	set sysctl [auto_execok "sysctl"]
	if {[llength $sysctl]} {
		if {![catch {exec {*}$sysctl -n "hw.ncpu"} cores]} {
			if {[string is integer -strict $cores]} {
				return $cores
			}
		}
	}

	# Assume Linux, which has /proc/cpuinfo, but be careful
	if {![catch {open "/proc/cpuinfo"} f]} {
		set cores [regexp -all -line {^processor\s} [read $f]]
		close $f
		if {$cores > 0} {
			return $cores
		}
	}

	# No idea what the actual number of cores is; exhausted all our options
	# Fall back to returning 1; there must be at least that because we're running on it!
	return 1
}

set ::jobIDs [list]
set ::numberOfThreads [numberOfThreads]
set ::threadPool [::tpool::create -minworkers $numberOfThreads -maxworkers $numberOfThreads -initcmd $::threadInit]
set ::processBlock_orderID -1
proc processBlock {args} {
	updateStatus

	incr ::processBlock_orderID
	
	set jobID [::tpool::post $::threadPool [list processBlockWorker ${::processBlock_orderID} {*}$args]]

	lappend ::jobIDs $jobID

	updateStatus
}

proc updateStatus {} {
	puts -nonewline " -> [llength $::jobIDs] jobs pending         \r"
	flush stdout
}

## -- MAIN
if {[llength $argv] == 0} {
	set seed [::nano::key::newSeed -hex]
	set acct1FrontierHash $::nano::block::zero
	puts stderr "WARNING: Unusable data will be created, use a seed and frontier hash for account-0 to create real data"
} else {
	if {[llength $argv] != 2} {
		error "Usage: stress <seed> <account-0-frontier-hash>"
	}

	set seed [lindex $argv 0]
	set acct1FrontierHash [lindex $argv 1]
}

set key1 [::nano::key::fromSeed $seed 0]
set key2 [::nano::key::fromSeed $seed 1]
set acct1 [::nano::address::fromPrivateKey $key1]
set acct2 [::nano::address::fromPrivateKey $key2]

::nano::account::setFrontier $acct1 $acct1FrontierHash 1 $acct1

for {set blockCount 0} {$blockCount < $iterationCount} {incr blockCount} {
	set block [::nano::account::send $acct1 $acct2 1 $key1]
	processBlock $block
	set hashSend [dict get [::nano::block::dict::fromJSON $block] _blockHash]

	set block [::nano::account::receive $acct2 $hashSend $key2]
	processBlock $block

	set block [::nano::account::send $acct2 $acct1 1 $key2]
	processBlock $block
	set hashSend [dict get [::nano::block::dict::fromJSON $block] _blockHash]

	set block [::nano::account::receive $acct1 $hashSend $key1]
	processBlock $block
}

# Wait for jobs to complete
while {[llength $::jobIDs] > 0} {
	updateStatus

	::tpool::wait $::threadPool $::jobIDs ::jobIDs
}

updateStatus

puts "\nDone !"