TestDMemoryLayout

D.d

import std.stdio;
import std.datetime;

enum { 
	NUM_RECORDS = 50 * 1000 * 444
}


DMemoryTrade[NUM_RECORDS] trades = void;

struct DMemoryTrade {
	long TradeId;
	long ClientId;
	int VenueCode;
	int InstrumentCode;
	long Price;
	long Quantity;
	byte Side;
};


void main() {
	for (auto i = 0; i < NUM_RECORDS; i++ ){
		DMemoryTrade trade;		
		trade.TradeId = 0;
		trade.ClientId = 0;
		trade.VenueCode = 0;
		trade.InstrumentCode = 0;
		trade.Price = 0;
		trade.Quantity = 0;
		trade.Side = 'A';
		trades[i] = trade;
	}
	for (auto i = 0; i < 5; i++ ){	
		perfRun(i);
	}	
}

void perfRun(int runNum ) {
	auto start = Clock.currTime();
	initTrades();

	long buyCost = 0;
	long sellCost = 0;

	for (auto i = 0; i < NUM_RECORDS; i++ ){
		auto trade = &(trades[i]);
		if (trade.Side == 'B') {
			buyCost += trade.Price * trade.Quantity;
		} else {
			sellCost += trade.Price * trade.Quantity;
		}
	}
	auto endT = Clock.currTime();
	long duration = (endT-start).fracSec.msecs + (endT-start).seconds * 1000;
	printf("%d - duration %d ms\n", runNum, duration);
	printf("buyCost = %d sellCost = %d\n", buyCost, sellCost);
}

void initTrades() {
	for (auto i = 0; i < NUM_RECORDS; i++) {
		auto trade = &(trades[i]);

		trade.TradeId = i;
		trade.ClientId = 1;
		trade.VenueCode = 123;
		trade.InstrumentCode = 321;

		trade.Price = i;
		trade.Quantity = i;

		if ((i&1) == 0) {
			trade.Side = 'B';
		} else {
			trade.Side = 'S';
		}
	}
}