/**
* Distributed Groebner base.
*
* @param modv number of module variables.
* @param F polynomial list.
* @return GB(F) a Groebner base of F or null, if a IOException occurs or on MPI client part.
*/
public List<GenPolynomial<C>> GB(int modv, List<GenPolynomial<C>> F) {
try {
if (engine.Rank() == 0) {
return GBmaster(modv, F);
}
} catch (MPIException e) {
logger.info("GBmaster: " + e);
e.printStackTrace();
return null;
} catch (IOException e) {
logger.info("GBmaster: " + e);
e.printStackTrace();
return null;
}
pool.terminate(); // not used on clients
try {
clientPart(0);
} catch (IOException e) {
logger.info("clientPart: " + e);
e.printStackTrace();
} catch (MPIException e) {
logger.info("clientPart: " + e);
e.printStackTrace();
}
return null;
}
/** Main run method. */
public void run() {
logger.debug("reducer client running");
Pair<C> pair = null;
GenPolynomial<C> pi, pj, ps;
GenPolynomial<C> S;
GenPolynomial<C> H = null;
// boolean set = false;
boolean goon = true;
int reduction = 0;
// int sleeps = 0;
Integer pix, pjx, psx;
while (goon) {
/* protocol:
* request pair, process pair, send result
*/
// pair = (Pair) pairlist.removeNext();
Object req = new GBTransportMessReq();
logger.debug("send request");
try {
pairChannel.send(req);
} catch (IOException e) {
goon = false;
e.printStackTrace();
break;
} catch (MPIException e) {
goon = false;
e.printStackTrace();
break;
}
logger.debug("receive pair, goon");
Object pp = null;
try {
pp = pairChannel.receive();
} catch (IOException e) {
goon = false;
if (logger.isDebugEnabled()) {
e.printStackTrace();
}
break;
} catch (MPIException e) {
goon = false;
if (logger.isDebugEnabled()) {
e.printStackTrace();
}
break;
} catch (ClassNotFoundException e) {
goon = false;
e.printStackTrace();
}
if (logger.isDebugEnabled()) {
logger.debug("received pair = " + pp);
}
H = null;
if (pp == null) { // should not happen
continue;
}
if (pp instanceof GBTransportMessEnd) {
goon = false;
continue;
}
if (pp instanceof GBTransportMessPair || pp instanceof GBTransportMessPairIndex) {
pi = pj = ps = null;
if (pp instanceof GBTransportMessPair) {
pair = ((GBTransportMessPair<C>) pp).pair;
if (pair != null) {
pi = pair.pi;
pj = pair.pj;
// logger.debug("pair: pix = " + pair.i
// + ", pjx = " + pair.j);
}
}
if (pp instanceof GBTransportMessPairIndex) {
pix = ((GBTransportMessPairIndex) pp).i;
pjx = ((GBTransportMessPairIndex) pp).j;
psx = ((GBTransportMessPairIndex) pp).s;
pi = theList.getWait(pix);
pj = theList.getWait(pjx);
ps = theList.getWait(psx);
// logger.info("pix = " + pix + ", pjx = " +pjx + ", psx = " +psx);
}
if (pi != null && pj != null) {
S = red.SPolynomial(pi, pj);
// System.out.println("S = " + S);
if (S.isZERO()) {
// pair.setZero(); does not work in dist
} else {
if (logger.isDebugEnabled()) {
logger.info("ht(S) = " + S.leadingExpVector());
}
H = red.normalform(theList, S);
reduction++;
if (H.isZERO()) {
// pair.setZero(); does not work in dist
} else {
H = H.monic();
if (logger.isInfoEnabled()) {
logger.info("ht(H) = " + H.leadingExpVector());
}
}
}
}
}
// send H or must send null
if (logger.isDebugEnabled()) {
logger.debug("#distributed list = " + theList.size());
logger.debug("send H polynomial = " + H);
}
try {
pairChannel.send(new GBTransportMessPoly<C>(H));
} catch (IOException e) {
goon = false;
e.printStackTrace();
} catch (MPIException e) {
goon = false;
e.printStackTrace();
}
}
logger.info("terminated, done " + reduction + " reductions");
pairChannel.close();
}
/** Main method. */
public void run() {
logger.debug("reducer server running: "); // + rank);
// try {
// pairChannel = new MPIChannel(engine, rank);
// } catch (IOException e) {
// e.printStackTrace();
// return;
// } catch (MPIException e) {
// e.printStackTrace();
// return;
// }
if (logger.isInfoEnabled()) {
logger.info("reducer server running: pairChannel = " + pairChannel);
}
Pair<C> pair;
GenPolynomial<C> H = null;
boolean set = false;
boolean goon = true;
int polIndex = -1;
int red = 0;
int sleeps = 0;
// while more requests
while (goon) {
// receive request
logger.debug("receive request");
Object req = null;
try {
req = pairChannel.receive();
} catch (IOException e) {
goon = false;
e.printStackTrace();
} catch (MPIException e) {
goon = false;
e.printStackTrace();
} catch (ClassNotFoundException e) {
goon = false;
e.printStackTrace();
}
// logger.debug("received request, req = " + req);
if (req == null) {
goon = false;
break;
}
if (!(req instanceof GBTransportMessReq)) {
goon = false;
break;
}
// find pair
logger.debug("find pair");
while (!pairlist.hasNext()) { // wait
if (!set) {
finaler.beIdle();
set = true;
}
if (!finaler.hasJobs() && !pairlist.hasNext()) {
goon = false;
break;
}
try {
sleeps++;
if (sleeps % 10 == 0) {
logger.info(" reducer is sleeping");
}
Thread.sleep(100);
} catch (InterruptedException e) {
goon = false;
break;
}
}
if (!pairlist.hasNext() && !finaler.hasJobs()) {
goon = false;
break; // continue; //break?
}
if (set) {
set = false;
finaler.notIdle();
}
pair = pairlist.removeNext();
/*
* send pair to client, receive H
*/
logger.debug("send pair = " + pair);
GBTransportMess msg = null;
if (pair != null) {
msg = new GBTransportMessPairIndex(pair);
} else {
msg = new GBTransportMess(); // End();
// goon ?= false;
}
try {
pairChannel.send(msg);
} catch (IOException e) {
e.printStackTrace();
goon = false;
break;
} catch (MPIException e) {
e.printStackTrace();
goon = false;
break;
}
logger.debug("#distributed list = " + theList.size());
Object rh = null;
try {
rh = pairChannel.receive();
} catch (IOException e) {
e.printStackTrace();
goon = false;
break;
} catch (MPIException e) {
e.printStackTrace();
goon = false;
break;
} catch (ClassNotFoundException e) {
e.printStackTrace();
goon = false;
break;
}
// logger.debug("received H polynomial");
if (rh == null) {
if (pair != null) {
pair.setZero();
}
} else if (rh instanceof GBTransportMessPoly) {
// update pair list
red++;
H = ((GBTransportMessPoly<C>) rh).pol;
if (logger.isDebugEnabled()) {
logger.debug("H = " + H);
}
if (H == null) {
if (pair != null) {
pair.setZero();
}
} else {
if (H.isZERO()) {
pair.setZero();
} else {
if (H.isONE()) {
polIndex = pairlist.putOne();
// GenPolynomial<C> nn =
theList.putWait(Integer.valueOf(polIndex), H);
goon = false;
break;
}
polIndex = pairlist.put(H);
// use putWait ? but still not all distributed
// GenPolynomial<C> nn =
theList.putWait(Integer.valueOf(polIndex), H);
}
}
}
}
logger.info("terminated, done " + red + " reductions");
/*
* send end mark to client
*/
logger.debug("send end");
try {
pairChannel.send(new GBTransportMessEnd());
} catch (IOException e) {
if (logger.isDebugEnabled()) {
e.printStackTrace();
}
} catch (MPIException e) {
if (logger.isDebugEnabled()) {
e.printStackTrace();
}
}
finaler.beIdle();
pairChannel.close();
}
