SSDs

TODO.md

@@ -66,9 +66,3 @@ NOTE: we're mostly bottlenecked by the architecture (typically a Lua VM) and the
 
 - make signals use a circular buffer instead of a simple array
 - use more arenas if possible
-
-# Drive costs
-
-The drive has platters just like in OC, as well as a cache line.
-The read cost is only factored in if `cachelineOf(lastSector) != cachelineOf(newSector)`.
-Seek cost is also in whole cache lines.

src/main.c

@@ -382,7 +382,8 @@ int main(int argc, char **argv) {
 		"component.invoke(g, 'set', 1, 1, 'starting sequential bench...')\n"
 		"local start = computer.uptime()\n"
 		"local cap = component.invoke(d, 'getCapacity')\n"
-		"local bc = component.invoke(d, 'getCapacity') / component.invoke(d, 'getSectorSize')\n"
+		"local ss = component.invoke(d, 'getSectorSize')\n"
+		"local bc = cap / ss\n"
 		"for i=1,bc do component.invoke(d, 'readSector', i) end\n"
 		"local now = computer.uptime()\n"
 		"component.invoke(g, 'set', 1, 2, 'took ' .. (now - start) .. 's')\n"
@@ -391,15 +392,15 @@ int main(int argc, char **argv) {
 		"component.invoke(g, 'bind', s, true)\n"
 		"component.invoke(g, 'set', 1, 1, 'starting random bench...')\n"
 		"start = computer.uptime()\n"
-		"local shortcut = 4\n"
-		"for i=1,bc/shortcut do local i = math.random(1, bc) component.invoke(d, 'readSector', i) end\n"
+		"local rand = 256\n"
+		"for i=1,rand do local i = math.random(1, bc) component.invoke(d, 'readSector', i) end\n"
 		"now = computer.uptime()\n"
 		"component.invoke(g, 'set', 1, 2, 'took ' .. (now - start) .. 's')\n"
-		"component.invoke(g, 'set', 1, 3, 'random read speed: ' .. (cap / shortcut / (now - start)) .. 'B/s')\n"
+		"component.invoke(g, 'set', 1, 3, 'random read speed: ' .. (rand * ss / (now - start)) .. 'B/s')\n"
 		"while computer.uptime() < now + 3 do computer.pullSignal(0.05) end\n"
 		"computer.shutdown(true)\n"
 	;
-	nn_Component *testDrive = ncl_createDrive(u, NULL, &nn_floppyDrive, testDriveData, strlen(testDriveData), false);
+	nn_Component *testDrive = ncl_createDrive(u, NULL, &nn_defaultSSDs[3], testDriveData, strlen(testDriveData), false);
 
 	ncl_setCLabel(managedfs, "Main Filesystem");
 	ncl_setCLabel(testingfs, "Secondary Filesystem");
@@ -450,6 +451,7 @@ restart:;
 		// collects stats
 		nn_setEnergyHandler(c, NULL, ne_energy_accumulator);
 	}
+	nn_setCallBudget(c, 0);
 
 	// default for 64-bit
 	if(sizeof(void *) > 4) nn_setMemoryScale(c, 1.8);

src/neonucleus.c

@@ -2423,7 +2423,7 @@ const nn_Filesystem nn_defaultTmpFS = NN_INIT(nn_Filesystem) {
 	.spaceTotal = 64 * NN_KiB,
 	.readsPerTick = 1024,
 	.writesPerTick = 512,
-	.dataEnergyCost = 512.0 / NN_MiB,
+	.dataEnergyCost = 0.1 / NN_MiB,
 };
 
 const nn_Drive nn_defaultDrives[4] = {
@@ -2436,7 +2436,7 @@ const nn_Drive nn_defaultDrives[4] = {
 		.writesPerTick = 10,
 		.rpm = 3600,
 		.onlySpinForwards = false,
-		.dataEnergyCost = 256.0 / NN_MiB,
+		.dataEnergyCost = 4.0 / NN_MiB,
 	},
 	NN_INIT(nn_Drive) {
 		.capacity = 2 * NN_MiB,
@@ -2447,29 +2447,29 @@ const nn_Drive nn_defaultDrives[4] = {
 		.writesPerTick = 15,
 		.rpm = 5400,
 		.onlySpinForwards = false,
-		.dataEnergyCost = 512.0 / NN_MiB,
+		.dataEnergyCost = 8.0 / NN_MiB,
 	},
 	NN_INIT(nn_Drive) {
 		.capacity = 4 * NN_MiB,
 		.sectorSize = 512,
 		.platterCount = 8,
-		.cacheLineSize = 4,
+		.cacheLineSize = 8,
 		.readsPerTick = 40,
 		.writesPerTick = 20,
 		.rpm = 7200,
 		.onlySpinForwards = false,
-		.dataEnergyCost = 1024.0 / NN_MiB,
+		.dataEnergyCost = 16.0 / NN_MiB,
 	},
 	NN_INIT(nn_Drive) {
 		.capacity = 8 * NN_MiB,
 		.sectorSize = 512,
 		.platterCount = 16,
-		.cacheLineSize = 8,
+		.cacheLineSize = 16,
 		.readsPerTick = 60,
 		.writesPerTick = 30,
 		.rpm = 7200,
 		.onlySpinForwards = false,
-		.dataEnergyCost = 2048.0 / NN_MiB,
+		.dataEnergyCost = 32.0 / NN_MiB,
 	},
 };
 
@@ -2482,9 +2482,67 @@ const nn_Drive nn_floppyDrive = {
 	.writesPerTick = 5,
 	.rpm = 1800,
 	.onlySpinForwards = true,
-	.dataEnergyCost = 128.0 / NN_MiB,
+	.dataEnergyCost = 1.0 / NN_MiB,
 };
 
+const nn_Drive nn_defaultSSDs[4] = {
+	NN_INIT(nn_Drive) {
+		.capacity = 512 * NN_KiB,
+		.sectorSize = 512,
+		.platterCount = 2,
+		.cacheLineSize = 2,
+		.readsPerTick = 20,
+		.writesPerTick = 10,
+		.rpm = 0,
+		.onlySpinForwards = false,
+		.dataEnergyCost = 64.0 / NN_MiB,
+	},
+	NN_INIT(nn_Drive) {
+		.capacity = 1 * NN_MiB,
+		.sectorSize = 512,
+		.platterCount = 4,
+		.cacheLineSize = 4,
+		.readsPerTick = 30,
+		.writesPerTick = 15,
+		.rpm = 0,
+		.onlySpinForwards = false,
+		.dataEnergyCost = 128.0 / NN_MiB,
+	},
+	NN_INIT(nn_Drive) {
+		.capacity = 2 * NN_MiB,
+		.sectorSize = 512,
+		.platterCount = 8,
+		.cacheLineSize = 8,
+		.readsPerTick = 40,
+		.writesPerTick = 20,
+		.rpm = 0,
+		.onlySpinForwards = false,
+		.dataEnergyCost = 256.0 / NN_MiB,
+	},
+	NN_INIT(nn_Drive) {
+		.capacity = 4 * NN_MiB,
+		.sectorSize = 512,
+		.platterCount = 16,
+		.cacheLineSize = 16,
+		.readsPerTick = 60,
+		.writesPerTick = 30,
+		.rpm = 0,
+		.onlySpinForwards = false,
+		.dataEnergyCost = 512.0 / NN_MiB,
+	},
+};
+
+const nn_Drive nn_floppySSD = {
+	.capacity = 256 * NN_KiB,
+	.sectorSize = 512,
+	.platterCount = 1,
+	.cacheLineSize = 2,
+	.readsPerTick = 10,
+	.writesPerTick = 5,
+	.rpm = 0,
+	.onlySpinForwards = true,
+	.dataEnergyCost = 16.0 / NN_MiB,
+};
 
 const nn_ScreenConfig nn_defaultScreens[4] = {
 	NN_INIT(nn_ScreenConfig) {
@@ -2667,7 +2725,7 @@ static void nn_splitColor(int color, double *r, double *g, double *b) {
 	*b = (double)_b / 255;
 }
 
-static double nn_colorLuminance(int color) {
+double nn_colorLuminance(int color) {
 	double r, g, b;
 	nn_splitColor(color, &r, &g, &b);
 	// taken from https://stackoverflow.com/questions/687261/converting-rgb-to-grayscale-intensity
@@ -3945,6 +4003,7 @@ static nn_Exit nn_drvHandler(nn_ComponentRequest *request) {
 		if(nn_drive_cachelineOf(curPos, cacheline) != nn_drive_cachelineOf(sec, cacheline)) {
 			nn_drive_seekPenalty(C, curPos, sec, &state->drive);
 			nn_costComponent(C, request->compAddress, state->drive.readsPerTick);
+			nn_removeEnergy(C, state->drive.dataEnergyCost * cacheline * ss);
 		}
 
 		char *sector = nn_alloc(ctx, ss);

src/neonucleus.h

@@ -1118,6 +1118,9 @@ typedef struct nn_Drive {
 extern const nn_Drive nn_defaultDrives[4];
 extern const nn_Drive nn_floppyDrive;
 
+extern const nn_Drive nn_defaultSSDs[4];
+extern const nn_Drive nn_floppySSD;
+
 typedef enum nn_DriveAction {
 	// drive gone
 	NN_DRIVE_DROP,
@@ -1449,6 +1452,8 @@ extern int nn_ocpalette8[256];
 // initializes the contents of the palettes.
 void nn_initPalettes();
 
+// Returns a number from 0 to 1 representing the perceived luminance.
+double nn_colorLuminance(int color);
 // Expensive.
 // Maps a color to the closest match in a palette.
 int nn_mapColor(int color, int *palette, size_t len);