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snowfall.c
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snowfall.c
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#define _GNU_SOURCE
#include <stdio.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdint.h>
#include <pthread.h>
#include <unistd.h>
#include <sys/time.h>
#include "well.h"
#include "util.h"
#include "monster.h"
#include "snowfall.h"
#define MULTIPLICITY 128
#define PAGESIZE (4*1024)
#define WRITE_CHUNK (1024 * 1024)
#define PASSES 7
void showInformation(struct fieldInfo *info) {
if(info->name) {
printf("Starting SnowFall for field %i (%s), %u %s\n", info->field, info->name, info->gbytes, info->unit);
} else {
printf("Starting SnowFall for field %i, %u %s\n", info->field, info->gbytes, info->unit);
}
}
void *initialStep(void *ptr) {
struct workAssignment *work = (struct workAssignment*)ptr;
// Wrap around for Snowfield 9 and above
uint64_t base = work->offset % 256;
for(uint64_t i=0; i<1024; i++) {
fill(work->w, (int32_t*)work->writeBuffer, (WRITE_CHUNK / 4));
pwritep(work->fd, work->writeBuffer, WRITE_CHUNK, (work->offset * 1024 + i) * 1024 * 1024ULL);
int32_t *location = &work->monster->buffer[256* (i + 1024 * base)];
mix(work->w, (unsigned char*)location, 256);
fill(work->w, location, 256);
}
return NULL;
}
void step2(int fd, struct well *w, struct snowMonster *monster, uint64_t writes, uint64_t page_count) {
unsigned char *writeBuffer = (unsigned char*)malloc(MULTIPLICITY * PAGESIZE);
unsigned char *existing = (unsigned char*)malloc(MULTIPLICITY * PAGESIZE);
struct node *nodes = (struct node*)malloc(MULTIPLICITY * sizeof(struct node));
if(!writeBuffer || !existing || !nodes) {
printf("Failed to allocate memory\n");
exit(-1);
}
int started = -1;
uint64_t last_step_time;
for(uint64_t run=0; run < writes; run++) {
if(run % 1024 == 0) {
struct timeval currentTime;
gettimeofday(¤tTime, NULL);
uint64_t this_step_time = currentTime.tv_sec * 1000000 + currentTime.tv_usec;
float percent = (100 * run) / (float)writes;
if(run == 0) {
printf("Pass %lu of %lu (%.1f%%)\r", run, writes, percent);
} else {
uint64_t eta = (uint64_t)((this_step_time - last_step_time) * (writes - run)) / (1000000 * 1024);
int seconds = eta % 60;
eta -= seconds;
eta /= 60;
int minutes = eta % 60;
eta -= minutes;
eta /= 60;
printf("Pass %lu of %lu (%.1f%%) ETA %02d:%02d:%02d\r", run, writes, percent, eta, minutes, seconds);
}
fflush(stdout);
last_step_time = this_step_time;
}
for(int m=0; m<MULTIPLICITY; m++) {
mix(w, (unsigned char*)getMonster(monster), 256);
fill(w, (int32_t*)&(writeBuffer[m * PAGESIZE]), PAGESIZE / 4);
fill(w, (int32_t*)&(nodes[m]), 2);
nodes[m].val = __builtin_bswap64(nodes[m].val) % page_count;
nodes[m].left = NULL;
nodes[m].right = NULL;
if(m > 0) {
struct node *it = &nodes[0];
do {
if(nodes[m].val == it->val) {
nodes[m].val = (nodes[m].val + 1) % page_count;
it = &nodes[0];
} else if(nodes[m].val < it->val) {
if(it->left == NULL) {
it->left = &nodes[m];
it = NULL;
} else
it = it->left;
} else {
if(it->right == NULL) {
it->right = &nodes[m];
it = NULL;
} else
it = it->right;
}
} while(it);
}
readahead(fd, nodes[m].val * PAGESIZE, PAGESIZE);
}
fillMonster(monster, w);
for(int m=0; m<MULTIPLICITY; m++) {
int read = 0;
do {
int bytes = pread(fd, &existing[m * PAGESIZE + read], PAGESIZE - read, nodes[m].val * PAGESIZE + read);
if(bytes < 1) {
printf("Error reading from file\n");
exit(-1);
}
read += bytes;
} while(read < PAGESIZE);
mix(w, &existing[m * PAGESIZE], 1024);
for(int i=0; i<PAGESIZE; i++)
writeBuffer[m * PAGESIZE + i] ^= existing[m * PAGESIZE + i];
int position = nodes[m].val * PAGESIZE;
int write = 0;
do {
int bytes = pwrite(fd, &writeBuffer[m * PAGESIZE + write], PAGESIZE - write, nodes[m].val * PAGESIZE + write);
if(bytes < 1) {
printf("Error writing to file\n");
exit(-1);
}
write += bytes;
} while(write < PAGESIZE);
mix(w, &writeBuffer[m * PAGESIZE], 1024);
}
}
free(writeBuffer);
free(existing);
free(nodes);
destroyMonster(monster);
destroyWell(w);
close(fd);
printf("Snowfield creation finished \n");
}
// Snowfall using bootstrap file
void snowFallBoot(char *directory, struct fieldInfo *info, int bootfd, char *raw) {
showInformation(info);
uint64_t execution_count = info->bytes / WRITE_CHUNK / 1024;
uint64_t page_count = info->bytes / (uint64_t)PAGESIZE;
uint64_t writes = (info->bytes / PAGESIZE * (uint64_t)PASSES) / MULTIPLICITY;
int fd = openFile(directory, info, "snow", 0, raw);
// Prepare wells
struct well *w = (struct well*)malloc(sizeof(struct well) * info->threads);
// First one comes with known state
initWellState(&w[0], info);
// Prepare Snow Monster
struct snowMonster monster;
initMonster(&monster);
// Fill with initial well state
fillMonster(&monster, &w[0]);
printf("Initial write ..\n");
struct workAssignment *work = (struct workAssignment*)malloc(sizeof(struct workAssignment) * info->threads);
for(int i=0; i<info->threads; i++) {
work[i].monster = &monster;
work[i].w = &w[i];
work[i].fd = fd;
work[i].state = 0;
if(i > 0)
initWell(&w[i]);
work[i].writeBuffer = (unsigned char*)malloc(WRITE_CHUNK);
if(!work[i].writeBuffer) {
printf("Failed to allocate writebuffer memory\n");
exit(-1);
}
}
int nt = 0;
uint64_t written = 0;
uint64_t lastwell = 0;
for(int i=0; i<execution_count; i++) {
if(work[nt].state) {
pthread_join(work[nt].thread, NULL);
work[nt].state = 0;
printf("%lu GiB written.\r", (++written));
fflush(stdout);
}
if(i > 0)
readState(&w[nt], bootfd);
work[nt].offset = i;
work[nt].state = 1;
pthread_create(&work[nt].thread, NULL, initialStep, (void*)&work[nt]);
lastwell = nt;
nt = (nt + 1) % info->threads;
}
for(int i=0; i<info->threads; i++)
if(work[i].state)
pthread_join(work[i].thread, NULL);
printf("Initial write completed. %lu GiB written.\n", execution_count);
for(int i=0; i<info->threads; i++)
free(work[i].writeBuffer);
// Continue with last segments state
nt = lastwell;
monster.position = (execution_count % 256) * 1024;
close(bootfd);
step2(fd, &w[nt], &monster, writes, page_count);
}
// Just create bootstrap file
void createBoot(char *directory, struct fieldInfo *info) {
showInformation(info);
uint64_t mb_count = info->bytes / WRITE_CHUNK;
uint64_t page_count = info->bytes / (uint64_t)PAGESIZE;
uint64_t writes = (page_count * (uint64_t)PASSES) / MULTIPLICITY;
char fileName[100];
sprintf(fileName, "bootstrap/%s.%i.boot", info->prefix, info->field);
int bootstrap = open(fileName, O_WRONLY | O_CREAT | __O_LARGEFILE, 0644);
if(!bootstrap) {
printf("Unable to open bootstrap file %s\n", fileName);
exit(-1);
}
// Prepare well
struct well w;
initWellState(&w, info);
// Prepare Snow Monster
struct snowMonster monster;
initMonster(&monster);
// Initial write
unsigned char *writeBuffer = (unsigned char*)malloc(WRITE_CHUNK);
if(!writeBuffer) {
printf("Failed to allocate writebuffer memory\n");
exit(-1);
}
fillMonster(&monster, &w);
for(uint64_t i=0; i<mb_count; i++) {
if(i > 1 && i % 1024 == 0)
writeState(&w, bootstrap);
fill(&w, (int32_t*)writeBuffer, (WRITE_CHUNK / 4));
mix(&w, (unsigned char*)getMonster(&monster), 256);
fillMonster(&monster, &w);
if(i % 1024 == 0) {
printf("%lu GiB scanned\r", i >> 10);
fflush(stdout);
}
}
printf("Bootstrap file created\n");
close(bootstrap);
}
// Create the snowfield without using a bootstrap file.
void snowFall(char *directory, struct fieldInfo *info, char *raw) {
showInformation(info);
uint64_t mb_count = info->bytes / WRITE_CHUNK;
uint64_t page_count = info->bytes / (uint64_t)PAGESIZE;
uint64_t writes = (page_count * (uint64_t)PASSES) / MULTIPLICITY;
int fd = openFile(directory, info, "snow", 0, raw);
// Prepare well
struct well w;
initWellState(&w, info);
// Prepare Snow Monster
struct snowMonster monster;
initMonster(&monster);
// Initial write
unsigned char *writeBuffer = (unsigned char*)malloc(WRITE_CHUNK);
if(!writeBuffer) {
printf("Failed to allocate writebuffer memory\n");
exit(-1);
}
fillMonster(&monster, &w);
printf("Initial write ..\n");
for(uint64_t i=0; i<mb_count; i++) {
// Fill it with 1MB of data
fill(&w, (int32_t*)writeBuffer, (WRITE_CHUNK / 4));
writep(fd, writeBuffer, WRITE_CHUNK);
mix(&w, (unsigned char*)getMonster(&monster), 256);
fillMonster(&monster, &w);
if(i % 1024 == 0) {
printf("%lu GiB written\r", i >> 10);
fflush(stdout);
}
}
printf("Initial write completed. %lu GiB written.\n", mb_count >> 10);
free(writeBuffer);
step2(fd, &w, &monster, writes, page_count);
}