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sieve.c
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sieve.c
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//
// $RCSfile: sieve.c,v $ - sieve for prp of the general form b^n - b^k - c
//
// $Date: 2013/12/11 22:04:58 $
//
// $Author: chuck $
//
// $Id: sieve.c,v 1.16 2013/12/11 22:04:58 chuck Exp chuck $
//
// ChangeLog:
//
// 04-Oct-2013 - Initial dev version
//
// $Log: sieve.c,v $
// Revision 1.16 2013/12/11 22:04:58 chuck
// Implemented multiplicative order test at top of loop to skip obvious no-solution P
//
// Revision 1.15 2013/12/02 19:16:57 chuck
// added rcs_file_version identification string
//
// Revision 1.14 2013/11/30 18:04:04 chuck
// change to mulmod / mulmod32 / mulmod64. Now quietly assigns.
//
// Revision 1.13 2013/11/29 21:50:55 chuck
// COMPLETELY overhauled main sieve module.
// New sieve creation now in newsieve.c
// Sieve setup, whether newsieve or existing sieve reload, now in sievesetup.c
// Sieve 'work' now done in sieveworker.c
// Added pthread support (launch and join/recovery)
// improved performance of 32/64 bit mulmod by using arithmetic-and trigger
// Changed array references to pointers & pointer math (addition) were cost effective
// Main sieve now 'thread 0' & default thread if no -t defined or -t 1 (1 thread) defined
// All Stats & save logic kept here.
// Many other smaller 'tweaks'
//
// Revision 1.12 2013/11/21 04:27:00 chuck
// Major changes implemented.
// a. candidates changed to bitmap from linked list from array.
// b. implementation of Mark, Dot, and Peek (skip over) true sieving logic based on res.
// c. implemented newsieve() export. New sieves are now setup in function.
// d. isolation of sieve logic in prep for relocation into
// e. interrupt tasks no longer perform i/o. Only set flags and let main logic handle it per standards
// f. runtime selection of mulmod() based on Pmax / MaxP requested.
//
// Revision 1.11 2013/11/17 01:15:52 chuck
// checking in preparing for K list overhaul
//
// Revision 1.10 2013/11/16 17:08:49 chuck
// VT-100 escape code EL0.
// Alarm task flag order changed to prevent possible loss of sieve data during concurrent interrupts.
//
// Revision 1.9 2013/11/16 06:35:39 chuck
// FINALLY corrected losing OutputFilename when optOutput specified.
//
// Revision 1.8 2013/11/16 04:59:04 chuck
// removed i/o from signal handlers (never should have been here)
//
// Revision 1.7 2013/11/15 21:18:36 chuck
// Rewrite of new sieve creation logic, sieve resume logic, auto-save/update,
// and added support for linked-link candidates (major speed increase)
// and 128 bit multiplies (for large P>2^32 which isn't really that big)
//
// Revision 1.6 2013/11/11 03:17:52 chuck
// fixed reference to gotint -> askint()
//
// Revision 1.5 2013/11/11 03:06:37 chuck
// Corrected enumeration mismatch and centralized definition into one module.
//
// Revision 1.4 2013/11/10 05:35:33 chuck
// reconstructed initialization code from printouts after source lost
//
// Revision 1.3 2013/11/10 01:01:29 chuck
// duplicate load/save removed
//
// Revision 1.2 2013/11/10 00:58:26 chuck
// fixed askyn() reference.. sb: askyesno()
//
// Revision 1.1 2013/10/21 05:59:46 chuck
// Initial revision
//
static char *rcs_file_verson = "$Id: sieve.c,v 1.16 2013/12/11 22:04:58 chuck Exp chuck $";
//
// global includes
#include <stdlib.h>
#include <stdio.h>
#include <inttypes.h>
#include <math.h>
#include <signal.h>
#include <unistd.h>
#include <string.h>
// Force undefine specific flags
#undef INLINE_MULMOD
// local includes
#include "limits.h"
#include "sieve.h" // global data contained here
#include "powmod.h"
#include "primegen.h"
#include "loadsaveini.h"
#include "option.h"
#include "signals.h"
#include "threads.h"
// Manual function prototype to handle issue I can't remember how to without embedding .h's
extern void sieveworker(ThreadInfo *);
// Actual 'do autosave' function (can't put printf inside a signal handler)
void autosaveworker()
{
// printf("Hello from AUTOSAVEWORKER\n");
// Pause Pgen so we can safely save data
PgenPause();
// Give everything a chance to go idle
sleep(1);
// Update LastP;
LastP = PgenLowtide();
// simply save the data
savedata();
// and the ini
saveini();
// clear the NeedSave flag
NeedSave = 0;
// Now resume
PgenResume();
}
static int StatsSamples = 1;
int statsworker()
{
int Removed,i;
// Sum the number of K removed in total
Removed = 0;
for (i=0; i<NumThreads; i++) Removed += Ksremoved[i];
// Update LastP by calling PgenLowtide() and checking
LastP = PgenLowtide();
// output stats (temp) of how many removed
printf("P=%lu, %d p/sec, factors found: %d (%d/min avg)",
LastP,DeltaP/60, Removed, (Removed/StatsSamples));
// clear the line to EOL
printf("%c[K\r", 27);
fflush(stdout);
// Clear the stats related flags
StatsSamples++;
DeltaP = 0;
NeedStats = 0;
}
void saveandexit()
{
printf("\nCtrl-C received, saving K's\n");
// Save the data then exit
savedata();
// Save the ini
saveini();
printf("\nExiting.\n");
exit(0);
}
main(int ac, char* av[])
{
int i;
// Initialze core variables before loading
ExitSieve = Quiet = Resume = New = Help = LogDelete = Verbose = 0;
// Set our auto-save timer (default interval = 10 min (600 sec))
Autosave = AutosaveDefault;
// Initialize our Stats and Save flags
AutosaveInterval = 0; // which 'tick' of the autosave count are we at
DeltaP = 0; // How many P's did we do. Incremented each time P is changed.
NeedSave = 0; // We don't need to save the data yet
NeedStats = 0; // We don't need to print stats yet
// No set limit for sieve unless specified
Pmax = 0;
Pmin = 0;
LastP = 0;
// get command line arguments (if any) and do what we can
// Options override ANYTHING that was specified in the ini (if it's applicable)
getoptions(ac,av);
// If help requested, display help then exit
if (optHelp) {
help();
exit(1);
}
// Have sievesetup perform all option handling and data loading or new sieve creation
sievesetup(ac,av);
// Default to no additional threads (single threaded operation)
NumThreads = 0;
// Were multiple threads requested? If so, validate how many
if (optThreads) {
if (optNumThreads >= MAXTHREADS) {
printf("Warning: Number of requested threads (%d) exceeds max (%d). Reduced.\n",
optNumThreads, MAXTHREADS-1);
optNumThreads = MAXTHREADS;
}
if (optNumThreads < 1) {
printf("Warning: Number of requested threads (%d) invalid. Defaulting to 1 thread\n");
optNumThreads = 1;
}
NumThreads = optNumThreads;
}
// If no threads requested, default to 1 (main thread only)
if (!NumThreads) NumThreads = 1;
// Initialize Kremoved stats counters
Ksremoved = calloc(1,sizeof(int)*(NumThreads+1));
// Establish signal handlers
InitSignals();
// =====================================================================
// ---- All data loaded and flags set. Ready to begin processing. ----
// =====================================================================
// Initialize Pgen
PgenInit(NumThreads);
// Initialize Eratosthenes
eratosthenes();
// BEFORE we start, are we picking up at a previous P? if so, skipto it
if (LastP) {
if (!Quiet) printf("Resuming sieve at P = %lu\n",LastP);
PgenSkipto(LastP);
}
// // Set mulmod appropriately (it will dynamically adjust)
// mulmod = mulmod32;
// if (LastP & SIEVEMASK32) mulmod = mulmod64;
// Start each thread
for (i=1; i< NumThreads; i++) ThreadStart(sieveworker,(void *)0 );
// Now make myself thread 0 (the only thread guaranteed to run)
Tcb = ThreadControlBlock;
Tcb[0].Number = 0;
Tcb[0].State = ThreadRun;
sieveworker(&Tcb[0]);
// We have returned from the worker, so sieving must be done or interrupted
// Make sure all threads have exited by asking nicely
for (i=0; i<NumThreads; i++) ThreadFini(i);
// Wait for them to finish
usleep(200000); // give them 200 milliseconds to clean up
// join and get the returns
for (i=1; i<NumThreads; i++) ThreadJoin(i);
// Now perform all final save & exit
printf("\nSieve Completed. P = %lu\n",LastP);
// Save the data
savedata();
// Save the ini
saveini();
// Done
printf("\nExiting.\n");
exit(0);
}