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raid.c
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raid.c
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#include <stdio.h>
#include <unistd.h>
#include "pagemap.h"
#include "raid.h"
#include "ssd.h"
// initialize_raid function initializes raid struct and all ssd connected to the struct
struct raid_info* initialize_raid(struct raid_info* raid, struct user_args* uargs) {
struct ssd_info *ssd_pointer;
unsigned int max_lsn_per_disk;
char *current_time;
char logfilename[80];
raid->raid_type = uargs->raid_type;
raid->num_disk = uargs->num_disk;
// try to access tracefile
strcpy(raid->tracefilename, uargs->trace_filename);
raid->tracefile = fopen(raid->tracefilename, "r");
if(raid->tracefile == NULL) {
printf("the tracefile can't be opened\n");
exit(1);
}
// prepare raid logfile
current_time = (char*) malloc(sizeof(char)*16);
get_current_time(current_time);
strcpy(logfilename, "raw/raid_"); strcat(logfilename, current_time); strcat(logfilename, ".log");
strcpy(raid->logfilename, logfilename);
raid->logfile = fopen(raid->logfilename, "w");
if (raid->logfile == NULL) {
printf("Error: can't create logfile for this raid simulation\n");
exit(1);
}
// prepare ssds struct
raid->connected_ssd=malloc(sizeof(struct ssd_info) * raid->num_disk);
alloc_assert(raid->connected_ssd, "connected ssd");
for (int i = 0; i < raid->num_disk; i++) {
ssd_pointer=(struct ssd_info*) malloc(sizeof(struct ssd_info));
alloc_assert(ssd_pointer, "one of connected ssd");
memset(ssd_pointer,0,sizeof(struct ssd_info));
raid->connected_ssd[i] = ssd_pointer;
}
// prepare gc scheduling algorithm
if (uargs->is_gclock) {
raid->gclock = (struct gclock_raid_info*) malloc(sizeof(struct gclock_raid_info));
alloc_assert(raid->gclock, "gclock_info");
memset(raid->gclock,0,sizeof(struct ssd_info));
raid->gclock->is_available = 1;
raid->gclock->gc_count = 0;
raid->gclock->holder_id = -1;
}
// initialize each ssd in raid
for (int i = 0; i < raid->num_disk; i++) {
printf("\nInitializing disk%d\n", i);
get_current_time(current_time);
strcpy(uargs->simulation_timestamp, current_time);
uargs->diskid = i;
raid->connected_ssd[i] = initialize_ssd(raid->connected_ssd[i], uargs);
raid->connected_ssd[i] = initiation(raid->connected_ssd[i]);
raid->connected_ssd[i] = make_aged(raid->connected_ssd[i]);
raid->connected_ssd[i] = pre_process_page(raid->connected_ssd[i]);
raid->connected_ssd[i]->tracefile = NULL;
raid->connected_ssd[i]->diskid = i;
if (uargs->is_gclock) {
raid->connected_ssd[i]->gclock_pointer = raid->gclock;
}
fprintf(raid->logfile, "raw/%s/\n", current_time);
}
// set raid block size and stripe size
raid->block_size = ssd_pointer->parameter->subpage_capacity;
raid->stripe_size = RAID_STRIPE_SIZE_BYTE;
raid->stripe_size_block = raid->stripe_size / raid->block_size;
raid->strip_size_block = raid->stripe_size_block / raid->num_disk;
if (raid->stripe_size_block == 0 || raid->strip_size_block == 0) {
printf("--> %u %u %u %u\n", raid->block_size, raid->stripe_size, raid->stripe_size_block, raid->strip_size_block);
printf("Error! wrong stripe size or strip size!\n");
exit(1);
}
// calculating the maximum lsn for the raid
max_lsn_per_disk = (unsigned int) ssd_pointer->parameter->subpage_page * ssd_pointer->parameter->page_block * ssd_pointer->parameter->block_plane * ssd_pointer->parameter->plane_die * ssd_pointer->parameter->die_chip * ssd_pointer->parameter->chip_num * (1 - ssd_pointer->parameter->overprovide );
raid->max_lsn = max_lsn_per_disk * raid->num_disk;
if (raid->raid_type == RAID_5)
raid->max_lsn -= max_lsn_per_disk;
free(current_time);
fclose(raid->logfile);
printf("RAID initialized!\n");
return raid;
}
struct raid_request* initialize_raid_request(struct raid_request* raid_req, int64_t req_incoming_time, unsigned int req_lsn, unsigned int req_size, unsigned int req_operation) {
raid_req->begin_time = req_incoming_time;
raid_req->lsn = req_lsn;
raid_req->size = req_size;
raid_req->operation = req_operation;
raid_req->prev_node = NULL;
raid_req->next_node = NULL;
return raid_req;
}
struct raid_sub_request* initialize_raid_sub_request(struct raid_sub_request* raid_subreq, struct raid_request* raid_req, unsigned int disk_id, unsigned int stripe_id, unsigned int strip_id, unsigned int strip_offset, unsigned int lsn, unsigned int size, unsigned int operation) {
struct raid_sub_request *ptr = NULL;
unsigned int state = R_SR_PENDING;
if (operation == WRITE_RAID) {
operation = WRITE;
state = R_SR_WAIT_PARITY;
}
raid_subreq->disk_id = disk_id;
raid_subreq->stripe_id = stripe_id;
raid_subreq->strip_id = strip_id;
raid_subreq->strip_offset = strip_offset;
raid_subreq->begin_time = raid_req->begin_time+RAID_SSD_LATENCY_NS;
raid_subreq->operation = operation;
raid_subreq->current_state = state;
raid_subreq->lsn = lsn;
raid_subreq->size = size;
raid_subreq->next_node = NULL;
if (raid_req->subs == NULL) {
raid_req->subs = raid_subreq;
} else {
ptr = raid_req->subs;
while(ptr->next_node != NULL) {
ptr = ptr->next_node;
}
ptr->next_node = raid_subreq;
}
return raid_subreq;
}
int simulate_raid(struct user_args* uargs) {
struct raid_info *raid;
raid=(struct raid_info*)malloc(sizeof(struct raid_info));
alloc_assert(raid, "raid");
memset(raid,0,sizeof(struct raid_info));
raid = initialize_raid(raid, uargs);
if (raid->raid_type == RAID_0) {
simulate_raid0(raid);
} else if (raid->raid_type == RAID_5) {
simulate_raid5(raid);
} else {
printf("Error! unknown raid version\n");
exit(1);
}
free_raid_ssd_and_tracefile(raid);
free(raid);
return 0;
}
void free_raid_ssd_and_tracefile(struct raid_info* raid) {
struct ssd_info *ssd;
for (int i = 0; i < raid->num_disk; i++) {
ssd = raid->connected_ssd[i];
statistic_output(ssd);
close_file(ssd);
free(ssd);
}
if (raid->gclock != NULL) {
free(raid->gclock);
}
fclose(raid->tracefile);
}
int64_t raid_find_nearest_event(struct raid_info* raid) {
int64_t nearest_time = MAX_INT64, temp;
for (int i = 0; i < raid->num_disk; i++) {
temp = find_nearest_event(raid->connected_ssd[i]);
if (temp < nearest_time) nearest_time = temp;
}
return nearest_time;
}
// raid_distribute_request will distribute single IO request in raid level
// to IO request in disk level. A single IO request can be splitted into multiple IO request
// in disk level. This function return R_DIST_SUCCESS (0) if success and R_DIST_ERR (1) if not.
int raid_distribute_request(struct raid_info* raid, int64_t req_incoming_time, unsigned int req_lsn, unsigned int req_size, unsigned int req_operation) {
unsigned int disk_id, strip_id, stripe_id, stripe_offset, strip_offset, disk_req_lsn, disk_req_size;
int req_size_block = req_size, parity_strip_id;
struct raid_request* raid_req;
struct raid_sub_request* raid_subreq;
if (raid->raid_type == RAID_0) {
if (raid->request_queue_length == RAID_REQUEST_QUEUE_CAPACITY) {
return R_DIST_ERR;
}
raid_req = (struct raid_request*)malloc(sizeof(struct raid_request));
alloc_assert(raid_req, "raid_request");
memset(raid_req,0,sizeof(struct raid_request));
initialize_raid_request(raid_req, req_incoming_time, req_lsn, req_size, req_operation);
while(req_size_block > 0) {
stripe_id = req_lsn / raid->stripe_size_block;
stripe_offset = req_lsn - (stripe_id * raid->stripe_size_block);
strip_id = stripe_offset / raid->strip_size_block;
strip_offset = stripe_offset % raid->strip_size_block;
disk_id = strip_id;
disk_req_lsn = (stripe_id * raid->strip_size_block) + strip_offset;
disk_req_size = (raid->strip_size_block - strip_offset >= req_size) ? req_size : raid->strip_size_block - strip_offset;
// add sub_request to request
#ifdef DEBUG
printf("--> req distributed to ssd: %u %u %u %u %u\n", disk_id, stripe_id, strip_id, strip_offset, disk_req_lsn);
#endif
raid_subreq = (struct raid_sub_request*)malloc(sizeof(struct raid_sub_request));
alloc_assert(raid_subreq, "raid_sub_request");
memset(raid_subreq,0,sizeof(struct raid_sub_request));
initialize_raid_sub_request(raid_subreq, raid_req, disk_id, stripe_id, strip_id, strip_offset, disk_req_lsn, disk_req_size, req_operation);
req_size_block = req_size_block - (raid->strip_size_block - strip_offset);
if (req_size_block > 0) {
req_size = req_size_block;
req_lsn = req_lsn + disk_req_size;
}
}
// add request to raid request queue
if (raid->request_queue == NULL) {
raid->request_queue = raid_req;
raid->request_tail = raid->request_queue;
} else {
raid_req->prev_node = raid->request_tail;
raid->request_tail->next_node = raid_req;
raid->request_tail = raid_req;
}
raid->request_queue_length = raid->request_queue_length + 1;
} else if (raid->raid_type==RAID_5) {
if (raid->request_queue_length == RAID_REQUEST_QUEUE_CAPACITY) {
return R_DIST_ERR;
}
raid_req = (struct raid_request*)malloc(sizeof(struct raid_request));
alloc_assert(raid_req, "raid_request");
memset(raid_req,0,sizeof(struct raid_request));
initialize_raid_request(raid_req, req_incoming_time, req_lsn, req_size, req_operation);
// handle read request
if (raid_req->operation == READ) {
while (req_size_block > 0) {
stripe_id = req_lsn / (raid->strip_size_block*(raid->num_disk-1)); // not include parity strip
stripe_offset = req_lsn - (raid->strip_size_block * (raid->num_disk-1) * stripe_id);
strip_id = stripe_offset / raid->strip_size_block;
parity_strip_id = stripe_id % raid->num_disk;
if (parity_strip_id <= strip_id) strip_id++;
strip_offset = stripe_offset % raid->strip_size_block;
disk_id = strip_id;
disk_req_lsn = (stripe_id * raid->strip_size_block) + strip_offset;
disk_req_size = (raid->strip_size_block - strip_offset >= req_size_block) ? req_size_block : raid->strip_size_block - strip_offset;
// add sub_request to request
raid_subreq = (struct raid_sub_request*)malloc(sizeof(struct raid_sub_request));
alloc_assert(raid_subreq, "raid_sub_request");
memset(raid_subreq,0,sizeof(struct raid_sub_request));
initialize_raid_sub_request(raid_subreq, raid_req, disk_id, stripe_id, strip_id, strip_offset, disk_req_lsn, disk_req_size, req_operation);
req_size_block = req_size_block - disk_req_size;
if (req_size_block > 0) {
req_lsn = req_lsn + disk_req_size;
}
}
}
// handle write request, parity calculation
if (raid_req->operation == WRITE) {
while (req_size_block > 0) {
#ifdef DEBUGRAID
printf(">> read old data %lld %d\n", req_incoming_time, req_size_block);
#endif
// reading old data
stripe_id = req_lsn / (raid->strip_size_block*(raid->num_disk-1)); // not include parity strip
stripe_offset = req_lsn - (raid->strip_size_block * (raid->num_disk-1) * stripe_id);
strip_id = stripe_offset / raid->strip_size_block;
parity_strip_id = stripe_id % raid->num_disk;
if (parity_strip_id <= strip_id) strip_id++;
strip_offset = stripe_offset % raid->strip_size_block;
disk_id = strip_id;
disk_req_lsn = (stripe_id * raid->strip_size_block) + strip_offset;
disk_req_size = (raid->strip_size_block - strip_offset >= req_size_block) ? req_size_block : raid->strip_size_block - strip_offset;
raid_subreq = (struct raid_sub_request*)malloc(sizeof(struct raid_sub_request));
alloc_assert(raid_subreq, "raid_sub_request");
memset(raid_subreq,0,sizeof(struct raid_sub_request));
initialize_raid_sub_request(raid_subreq, raid_req, disk_id, stripe_id, strip_id, strip_offset, disk_req_lsn, disk_req_size, READ);
req_size_block = req_size_block - disk_req_size;
if (req_size_block > 0) {
req_lsn = req_lsn + disk_req_size;
}
// reading old parity
if (req_size_block <= 0 || disk_id == raid->num_disk-2) {
raid_subreq = (struct raid_sub_request*)malloc(sizeof(struct raid_sub_request));
alloc_assert(raid_subreq, "raid_sub_request");
memset(raid_subreq,0,sizeof(struct raid_sub_request));
initialize_raid_sub_request(raid_subreq, raid_req, parity_strip_id, stripe_id, parity_strip_id, 0, disk_req_lsn, raid->strip_size_block, READ);
}
}
// calculating new parity will be handled on raid5_finish_parity_calculation();
req_size_block = req_size;
while (req_size_block > 0) {
// writing new data
stripe_id = req_lsn / (raid->strip_size_block*(raid->num_disk-1)); // not include parity strip
stripe_offset = req_lsn - (raid->strip_size_block * (raid->num_disk-1) * stripe_id);
strip_id = stripe_offset / raid->strip_size_block;
parity_strip_id = stripe_id % raid->num_disk;
if (parity_strip_id <= strip_id) strip_id++;
strip_offset = stripe_offset % raid->strip_size_block;
disk_id = strip_id;
disk_req_lsn = (stripe_id * raid->strip_size_block) + strip_offset;
disk_req_size = (raid->strip_size_block - strip_offset >= req_size_block) ? req_size_block : raid->strip_size_block - strip_offset;
raid_subreq = (struct raid_sub_request*)malloc(sizeof(struct raid_sub_request));
alloc_assert(raid_subreq, "raid_sub_request");
memset(raid_subreq,0,sizeof(struct raid_sub_request));
initialize_raid_sub_request(raid_subreq, raid_req, disk_id, stripe_id, strip_id, strip_offset, disk_req_lsn, disk_req_size, WRITE_RAID);
req_size_block = req_size_block - disk_req_size;
if (req_size_block > 0) {
req_lsn = req_lsn + disk_req_size;
}
// writing new parity
if (req_size_block <= 0 || disk_id == raid->num_disk-2) {
raid_subreq = (struct raid_sub_request*)malloc(sizeof(struct raid_sub_request));
alloc_assert(raid_subreq, "raid_sub_request");
memset(raid_subreq,0,sizeof(struct raid_sub_request));
initialize_raid_sub_request(raid_subreq, raid_req, parity_strip_id, stripe_id, parity_strip_id, 0, disk_req_lsn, raid->strip_size_block, WRITE_RAID);
}
}
}
// add request to raid request queue
if (raid->request_queue == NULL) {
raid->request_queue = raid_req;
raid->request_tail = raid->request_queue;
} else {
raid_req->prev_node = raid->request_tail;
raid->request_tail->next_node = raid_req;
raid->request_tail = raid_req;
}
raid->request_queue_length = raid->request_queue_length + 1;
} else {
printf("Error: unknown RAID type!\n");
exit(100);
}
return R_DIST_SUCCESS;
}
int raid_clear_completed_request(struct raid_info* raid) {
struct raid_request* req_pointer, *temp_r;
struct raid_sub_request* subreq_pointer, *temp_sr;
int is_all_completed = 1, is_need_move_forward = 1;
req_pointer = raid->request_queue;
while (req_pointer != NULL){
is_all_completed = is_need_move_forward = 1;
subreq_pointer = req_pointer->subs;
while (subreq_pointer != NULL){
if (subreq_pointer->current_state != R_SR_COMPLETE) {
is_all_completed = 0;
break;
}
subreq_pointer = subreq_pointer->next_node;
}
if (is_all_completed) {
subreq_pointer = req_pointer->subs;
while (subreq_pointer != NULL){
temp_sr = subreq_pointer;
subreq_pointer = temp_sr->next_node;
free(temp_sr);
}
req_pointer->subs = NULL;
if (raid->request_queue_length == 1) { // the only element in queue
free((void *)req_pointer);
req_pointer = NULL;
raid->request_queue = raid->request_tail = NULL;
is_need_move_forward = 0;
} else if (raid->request_queue == req_pointer) { // first element in queue with multiple elements
raid->request_queue = req_pointer->next_node;
raid->request_queue->prev_node = NULL;
free((void *)req_pointer);
req_pointer = raid->request_queue;
is_need_move_forward = 0;
} else { // middle or last element in queue
temp_r = req_pointer->prev_node;
temp_r->next_node = req_pointer->next_node;
if (raid->request_tail == req_pointer) {
raid->request_tail = req_pointer->prev_node;
} else {
(req_pointer->next_node)->prev_node = temp_r;
}
free((void *)req_pointer);
req_pointer = temp_r;
}
raid->request_queue_length = raid->request_queue_length - 1;
}
if (req_pointer != NULL && is_need_move_forward)
req_pointer = req_pointer->next_node;
}
return 0;
}
void raid_simulate_ssd(struct raid_info* raid, int disk_id) {
// iterate raid request queue, find first incoming request for this disk
struct ssd_info* ssd;
int interface_flag = 0;
ssd = raid->connected_ssd[disk_id];
// Interface layer
interface_flag = raid_ssd_get_requests(disk_id, ssd, raid);
// Buffer layer
if(interface_flag == 1) {
if (ssd->parameter->dram_capacity!=0) {
buffer_management(ssd);
distribute(ssd);
} else {
no_buffer_distribute(ssd);
}
}
// FTL+FCL+Flash layer
process(ssd);
raid_ssd_trace_output(ssd);
}
// raid_ssd_get_requests will try to insert request from raid request queue to
// ssd request queue. Return 1: request added to ssd request queue
// -1: no request added to ssd request queue
// 0: no request in raid req queue for this disk
int raid_ssd_get_requests(int disk_id, struct ssd_info *ssd, struct raid_info *raid) {
struct raid_request *rreq;
struct raid_sub_request *rsreq;
struct request *ssd_request;
int is_found = 0;
unsigned int req_lsn=0;
int req_device, req_size, req_ope, large_lsn;
int64_t req_time = 0;
int64_t nearest_event_time;
rreq = raid->request_queue;
// get first unprocessed request for this disk from raid req queue
while (rreq != NULL && !is_found) {
rsreq = rreq->subs;
while (rsreq != NULL) {
if (rsreq->disk_id == disk_id && rsreq->current_state == R_SR_PENDING) {
is_found = 1;
break;
}
rsreq = rsreq->next_node;
}
rreq = rreq->next_node;
}
nearest_event_time = raid_find_nearest_event(raid);
// no request for this disk
if (rsreq == NULL || !is_found) {
if (nearest_event_time != MAX_INT64)
ssd->current_time=nearest_event_time;
return 0;
}
// insert this request to ssd's request queue
req_device = disk_id;
req_time = rsreq->begin_time;
req_lsn = rsreq->lsn;
req_size = rsreq->size;
req_ope = rsreq->operation;
if (req_device < 0 || req_size < 0 || req_lsn < 0 || !(req_ope == WRITE || req_ope == READ)) {
printf("Error! wrong io request from raid controller\n");
exit(100);
}
large_lsn=(int)((ssd->parameter->subpage_page*ssd->parameter->page_block*ssd->parameter->block_plane*ssd->parameter->plane_die*ssd->parameter->die_chip*ssd->parameter->chip_num)*(1-ssd->parameter->overprovide));
req_lsn = req_lsn%large_lsn;
if (nearest_event_time==MAX_INT64) {
ssd->current_time = req_time;
} else {
if (nearest_event_time < req_time) {
if (ssd->current_time <= nearest_event_time) ssd->current_time = nearest_event_time;
return -1;
} else {
if (ssd->request_queue_length>=ssd->parameter->queue_length) {
ssd->current_time = nearest_event_time;
return -1;
} else {
ssd->current_time = req_time;
}
}
}
if (req_time < 0) {
printf("Error! wrong io request's incoming time\n");
exit(100);
}
// set this raid's sub request state to R_SR_PROCESS
rsreq->current_state = R_SR_PROCESS;
ssd_request = (struct request*) malloc(sizeof(struct request));
alloc_assert(ssd_request, "ssd_request");
memset(ssd_request, 0, sizeof(struct request));
ssd_request->time = req_time;
ssd_request->lsn = req_lsn;
ssd_request->size = req_size;
ssd_request->operation = req_ope;
ssd_request->begin_time = req_time;
ssd_request->response_time = 0;
ssd_request->energy_consumption = 0;
ssd_request->next_node = NULL;
ssd_request->distri_flag = 0;
ssd_request->subs = NULL;
ssd_request->need_distr_flag = NULL;
ssd_request->complete_lsn_count=0;
ssd_request->subreq_on_raid = rsreq;
// add to ssd queue
if (ssd->request_queue == NULL) {
ssd->request_queue = ssd_request;
} else {
(ssd->request_tail)->next_node = ssd_request;
}
ssd->request_tail = ssd_request;
ssd->request_queue_length++;
// update ssd statistics
if (ssd_request->lsn > ssd->max_lsn) ssd->max_lsn = ssd_request->lsn;
if (ssd_request->lsn < ssd->min_lsn) ssd->min_lsn = ssd_request->lsn;
if (ssd_request->operation == WRITE) ssd->ave_write_size=(ssd->ave_write_size*ssd->write_request_count+ssd_request->size)/(ssd->write_request_count+1);
if (ssd_request->operation == READ) ssd->ave_read_size=(ssd->ave_read_size*ssd->read_request_count+ssd_request->size)/(ssd->read_request_count+1);
return 1;
}
int raid_ssd_interface(struct ssd_info* ssd, struct raid_sub_request *subreq) {
int large_lsn;
int64_t nearest_event_time;
struct request *ssd_request;
nearest_event_time = find_nearest_event(ssd);
// only update ssd->current time if subreq is null
// this is used only after the "tracefile" is eof
// until the request queue in this ssd is empty
if (subreq == NULL) {
ssd->current_time = nearest_event_time;
return SUCCESS;
}
large_lsn = (int)((ssd->parameter->subpage_page*ssd->parameter->page_block*ssd->parameter->block_plane*ssd->parameter->plane_die*ssd->parameter->die_chip*ssd->parameter->chip_num)*(1-ssd->parameter->overprovide));
subreq->lsn = subreq->lsn % large_lsn;
if (nearest_event_time == MAX_INT64) {
ssd->current_time = subreq->begin_time;
} else {
if (nearest_event_time < subreq->begin_time) {
if (ssd->current_time <= nearest_event_time) ssd->current_time = nearest_event_time;
return ERROR;
} else {
if (ssd->request_queue_length >= ssd->parameter->queue_length) {
return ERROR;
} else {
ssd->current_time = subreq->begin_time;
}
}
}
ssd_request = (struct request*) malloc(sizeof(struct request));
alloc_assert(ssd_request, "ssd_request");
memset(ssd_request, 0, sizeof(struct request));
ssd_request->time = subreq->begin_time;
ssd_request->lsn = subreq->lsn;
ssd_request->size = subreq->size;
ssd_request->operation = subreq->operation;
ssd_request->begin_time = subreq->begin_time;
ssd_request->response_time = 0;
ssd_request->energy_consumption = 0;
ssd_request->next_node = NULL;
ssd_request->distri_flag = 0;
ssd_request->subs = NULL;
ssd_request->need_distr_flag = NULL;
ssd_request->complete_lsn_count=0;
ssd_request->subreq_on_raid = subreq;
// add to ssd queue
if (ssd->request_queue == NULL) {
ssd->request_queue = ssd_request;
} else {
(ssd->request_tail)->next_node = ssd_request;
}
ssd->request_tail = ssd_request;
ssd->request_queue_length++;
// update ssd statistics
if (ssd_request->lsn > ssd->max_lsn) ssd->max_lsn = ssd_request->lsn;
if (ssd_request->lsn < ssd->min_lsn) ssd->min_lsn = ssd_request->lsn;
if (ssd_request->operation == WRITE) ssd->ave_write_size=(ssd->ave_write_size*ssd->write_request_count+ssd_request->size)/(ssd->write_request_count+1);
if (ssd_request->operation == READ) ssd->ave_read_size=(ssd->ave_read_size*ssd->read_request_count+ssd_request->size)/(ssd->read_request_count+1);
return SUCCESS;
}
void raid_ssd_trace_output(struct ssd_info* ssd) {
struct request *req, *req_temp;
struct sub_request *sub, *tmp;
int64_t start_time, end_time, latency;
int is_all_sub_completed;
req_temp = NULL;
req = ssd->request_queue;
if (req == NULL)
return;
while (req != NULL){
latency = 0;
if (req->response_time != 0) {
latency = req->response_time-req->time;
#ifdef DEBUG
printf("%16lld %10d %6d %2d %16lld %16lld %10lld %2d %10lld\n",req->time,req->lsn, req->size, req->operation, req->begin_time, req->response_time, latency, req->meet_gc_flag, req->meet_gc_remaining_time);
#endif
fprintf(ssd->outputfile,"%16lld %10d %6d %2d %16lld %16lld %10lld %2d %10lld\n",req->time,req->lsn, req->size, req->operation, req->begin_time, req->response_time, latency, req->meet_gc_flag, req->meet_gc_remaining_time); fflush(ssd->outputfile);
fprintf(ssd->outfile_io,"%16lld %10d %6d %2d %16lld %16lld %10lld %2d %10lld\n",req->time,req->lsn, req->size, req->operation, req->begin_time, req->response_time, latency, req->meet_gc_flag, req->meet_gc_remaining_time); fflush(ssd->outfile_io);
if (req->operation == WRITE) {
fprintf(ssd->outfile_io_write,"%16lld %10d %6d %2d %16lld %16lld %10lld %2d %10lld\n",req->time,req->lsn, req->size, req->operation, req->begin_time, req->response_time, latency, req->meet_gc_flag, req->meet_gc_remaining_time);
fflush(ssd->outfile_io_write);
ssd->write_request_count++;
ssd->write_avg=ssd->write_avg+(req->response_time-req->time);
} else if (req->operation == READ){
fprintf(ssd->outfile_io_read,"%16lld %10d %6d %2d %16lld %16lld %10lld %2d %10lld\n",req->time,req->lsn, req->size, req->operation, req->begin_time, req->response_time, latency, req->meet_gc_flag, req->meet_gc_remaining_time);
fflush(ssd->outfile_io_read);
ssd->read_request_count++;
ssd->read_avg=ssd->read_avg+(req->response_time-req->time);
}
if(req->response_time-req->begin_time==0) {
printf("the response time is 0?? \n");
exit(1);
}
req_temp = req;
req = req->next_node;
ssd_delete_request_from_queue(ssd, req_temp);
} else {
sub = req->subs;
is_all_sub_completed = 1;
start_time = end_time = 0;
// if any sub-request is not completed, the request is not completed
while (sub != NULL){
if (start_time == 0) start_time = sub->begin_time;
if (start_time > sub->begin_time) start_time = sub->begin_time;
if (end_time < sub->complete_time) end_time = sub->complete_time;
if((sub->current_state == SR_COMPLETE)||((sub->next_state==SR_COMPLETE)&&(sub->next_state_predict_time<=ssd->current_time))) {
sub = sub->next_subs;
} else {
is_all_sub_completed = 0;
break;
}
}
if (is_all_sub_completed) {
latency = end_time-req->time;
#ifdef DEBUG
printf("%16lld %10d %6d %2d %16lld %16lld %10lld %2d %10lld\n",req->time,req->lsn, req->size, req->operation, req->begin_time, req->response_time, latency, req->meet_gc_flag, req->meet_gc_remaining_time);
#endif
fprintf(ssd->outputfile,"%16lld %10d %6d %2d %16lld %16lld %10lld %2d %10lld\n",req->time,req->lsn, req->size, req->operation, req->begin_time, req->response_time, latency, req->meet_gc_flag, req->meet_gc_remaining_time);
fflush(ssd->outputfile);
fprintf(ssd->outfile_io,"%16lld %10d %6d %2d %16lld %16lld %10lld %2d %10lld\n",req->time,req->lsn, req->size, req->operation, req->begin_time, req->response_time, latency, req->meet_gc_flag, req->meet_gc_remaining_time);
fflush(ssd->outfile_io);
if (req->operation == WRITE) {
fprintf(ssd->outfile_io_write,"%16lld %10d %6d %2d %16lld %16lld %10lld %2d %10lld\n",req->time,req->lsn, req->size, req->operation, req->begin_time, req->response_time, latency, req->meet_gc_flag, req->meet_gc_remaining_time);
fflush(ssd->outfile_io_write);
ssd->write_request_count++;
ssd->write_avg=ssd->write_avg+(end_time-req->time);
} else if (req->operation == READ){
fprintf(ssd->outfile_io_read,"%16lld %10d %6d %2d %16lld %16lld %10lld %2d %10lld\n",req->time,req->lsn, req->size, req->operation, req->begin_time, req->response_time, latency, req->meet_gc_flag, req->meet_gc_remaining_time);
fflush(ssd->outfile_io_read);
ssd->read_request_count++;
ssd->read_avg=ssd->read_avg+(end_time-req->time);
}
if(end_time-start_time==0) {
printf("the response time is 0?? \n");
exit(1);
} else {
req->response_time=end_time;
}
// empty the sub on the req
while (req->subs!=NULL){
tmp = req->subs;
req->subs = tmp->next_subs;
if (tmp->update!=NULL) {
free(tmp->update->location);
tmp->update->location=NULL;
free(tmp->update);
tmp->update=NULL;
}
free(tmp->location);
tmp->location=NULL;
free((void *)tmp);
tmp=NULL;
}
req_temp = req;
req = req->next_node;
ssd_delete_request_from_queue(ssd, req_temp);
} else {
req = req->next_node;
}
}
}
return;
}
void ssd_delete_request_from_queue(struct ssd_info* ssd, struct request *req) {
struct request *temp, *prev;
// update raid subrequest
(req->subreq_on_raid)->current_state = R_SR_COMPLETE;
(req->subreq_on_raid)->complete_time = req->response_time+RAID_SSD_LATENCY_NS;
// req is first element of queue
if (req == ssd->request_queue) {
req->subreq_on_raid = NULL;
ssd->request_queue = req->next_node;
free(req->need_distr_flag);
req->need_distr_flag=NULL;
// req is alone in the queue
if (ssd->request_tail == req) {
ssd->request_tail=NULL;
}
free((void *)req);
ssd->request_queue_length--;
return;
}
// find the prev req before req
temp = ssd->request_queue;
while (temp != NULL && temp != req) {
prev = temp;
temp = temp->next_node;
}
if (temp == NULL || prev == NULL) {
printf("Error! can't find request that need to be deleted\n");
exit(100);
}
prev->next_node = req->next_node;
if (ssd->request_tail == req) ssd->request_tail = prev;
req->next_node = NULL;
free(req->need_distr_flag);
req->need_distr_flag = NULL;
free((void *)req);
ssd->request_queue_length--;
return;
}
// raid5_finish_parity_calculation will change the state of write request
void raid5_finish_parity_calculation(struct raid_info* raid) {
struct raid_request* rreq;
struct raid_sub_request *srreq;
int is_all_read_finish, is_processing_write;
int64_t read_finish_time;
rreq = raid->request_queue;
while(rreq!=NULL){
if (rreq->operation==WRITE) {
is_all_read_finish = 1; is_processing_write = 0; read_finish_time = 0;
srreq = rreq->subs;
while(srreq!=NULL){
if (srreq->operation==READ && srreq->current_state!=R_SR_COMPLETE) {
is_all_read_finish = 0;
break;
}
if (srreq->operation==WRITE && srreq->current_state!=R_SR_WAIT_PARITY) {
is_processing_write = 1;
break;
}
if (srreq->operation==READ && srreq->current_state==R_SR_COMPLETE && read_finish_time<srreq->complete_time) {
read_finish_time = srreq->complete_time;
}
srreq = srreq->next_node;
}
// if all read req is finished, we can continue our write req
if (is_all_read_finish && !is_processing_write) {
srreq = rreq->subs;
while(srreq!=NULL){
if (srreq->operation==WRITE) {
srreq->current_state=R_SR_PENDING;
srreq->begin_time=read_finish_time+RAID5_PARITY_CALC_TIME_NS+RAID_SSD_LATENCY_NS;
}
srreq = srreq->next_node;
}
}
}
rreq = rreq->next_node;
}
}
void raid_print_req_queue(struct raid_info* raid) {
struct raid_request* rreq;
struct raid_sub_request *srreq;
int rreq_id = 0;
printf(" ============ RAID REQUEST QUEUE ============ \n");
rreq = raid->request_queue;
while (rreq != NULL) {
printf(" [%d] %lld %lld %u %u %u\n", rreq_id, rreq->begin_time, rreq->response_time, rreq->lsn, rreq->size, rreq->operation);
srreq = rreq->subs;
while (srreq != NULL) {
printf(" %u %u %lld %lld\n", srreq->disk_id, srreq->current_state, srreq->begin_time, srreq->complete_time);
srreq = srreq->next_node;
}
rreq = rreq->next_node;
rreq_id++;
}
printf(" ============ RAID REQUEST QUEUE ============ \n");
}
struct raid_info* simulate_raid0(struct raid_info* raid) {
int req_device_id, req_size, req_operation, flag, err, is_accept_req, interface_flag;
int64_t req_incoming_time, nearest_event_time, req_lsn;
struct ssd_info *ssd;
char buffer[200];
long filepoint;
// Run the RAID0 simulation untill all the request is tracefile is processed
while (flag != RAID_SIMULATION_FINISH) {
// Stop the simulation, if we reach the end of the tracefile and request queue is empty
if (feof(raid->tracefile) && raid->request_queue_length==0) {
flag = RAID_SIMULATION_FINISH;
}
// Trying to get a request from tracefile
if (!feof(raid->tracefile)) {
// Read a request from tracefile
filepoint = ftell(raid->tracefile);
fgets (buffer, 200, raid->tracefile);
sscanf (buffer,"%lld %d %lld %d %d", &req_incoming_time, &req_device_id, &req_lsn, &req_size, &req_operation);
is_accept_req = 1;
// Validating incoming request
if (req_device_id < 0 || req_lsn < 0 || req_size < 0 || !(req_operation == 0 || req_operation == 1)) {
printf("Error! wrong io request from tracefile (%lld %d %lld %d %d)\n", req_incoming_time, req_device_id, req_lsn, req_size, req_operation);
exit(1);
}
if (req_incoming_time < 0) {
printf("Error! wrong incoming time! (%lld %d %lld %d %d)\n", req_incoming_time, req_device_id, req_lsn, req_size, req_operation);
exit(1);
}
req_lsn = req_lsn%raid->max_lsn;
// Check whether we can process this request or not
nearest_event_time = raid_find_nearest_event(raid);
#ifdef DEBUG
printf(" nearest time %lld %lld %lld %d\n", nearest_event_time, req_incoming_time, raid->current_time, raid->request_queue_length);
#endif
if (raid->request_queue_length >= RAID_REQUEST_QUEUE_CAPACITY) {
fseek(raid->tracefile,filepoint,0);
is_accept_req = 0;
}
if (nearest_event_time != MAX_INT64) raid->current_time = nearest_event_time;
if (is_accept_req) {
#ifdef DEBUG
printf("req inserted: %lld %d %d %d %d [%d]\n", req_incoming_time, req_device_id, req_lsn, req_size, req_operation, raid->request_queue_length);
#endif
// insert request to raid rquest queue
// a single request can be forwarder to multiple disk
err = raid_distribute_request(raid, req_incoming_time, req_lsn, req_size, req_operation);
if (err == R_DIST_ERR) {
fseek(raid->tracefile,filepoint,0);
printf("Error! Distributing raid request failed!\n");
// getchar();
continue;
}
}
}
// simulate all the ssd in the raid,
// this is corresponding to simulate(ssd_info *ssd) function in ssd.c
for(int i = 0; i < raid->num_disk; i++) {
raid_simulate_ssd(raid, i);
}
// remove processed request from raid queue
raid_clear_completed_request(raid);
}
return raid;
}
struct raid_info* simulate_raid5(struct raid_info* raid) {
int req_device_id, req_size, req_operation, flag, err, is_accept_req, interface_flag;
int64_t req_incoming_time, nearest_event_time, req_lsn;
struct ssd_info *ssd;
char buffer[200];
long filepoint;
// Run the RAID5 simulation untill all the request is tracefile is processed
while (flag != RAID_SIMULATION_FINISH) {
// Stop the simulation, if we reach the end of the tracefile and request queue is empty
if (feof(raid->tracefile) && raid->request_queue_length==0) {
flag = RAID_SIMULATION_FINISH;
}
// Trying to get a request from tracefile
if (!feof(raid->tracefile)) {
// Read a request from tracefile
filepoint = ftell(raid->tracefile);
fgets (buffer, 200, raid->tracefile);
sscanf (buffer,"%lld %d %lld %d %d", &req_incoming_time, &req_device_id, &req_lsn, &req_size, &req_operation);
is_accept_req = 1;
// Validating incoming request
if (req_device_id < 0 || req_lsn < 0 || req_size < 0 || !(req_operation == 0 || req_operation == 1)) {
printf("Error! wrong io request from tracefile (%lld %d %lld %d %d)\n", req_incoming_time, req_device_id, req_lsn, req_size, req_operation);
exit(1);
}
if (req_incoming_time < 0) {
printf("Error! wrong incoming time! (%lld %d %lld %d %d)\n", req_incoming_time, req_device_id, req_lsn, req_size, req_operation);
exit(1);
}
req_lsn = req_lsn%raid->max_lsn;
// Check whether we can process this request or not
nearest_event_time = raid_find_nearest_event(raid);
#ifdef DEBUGRAID
printf(" nearest time %lld %lld %lld %d\n", nearest_event_time, req_incoming_time, raid->current_time, raid->request_queue_length);
#endif
if (raid->request_queue_length >= RAID_REQUEST_QUEUE_CAPACITY) {
fseek(raid->tracefile,filepoint,0);
is_accept_req = 0;
}
if (nearest_event_time != MAX_INT64) raid->current_time = nearest_event_time;
if (is_accept_req) {
#ifdef DEBUGRAID
printf("req inserted: %lld %d %d %d %d [%d]\n", req_incoming_time, req_device_id, req_lsn, req_size, req_operation, raid->request_queue_length);