algorithm - how to make code on openMP work on xeon phi? -


everyone. hope me. have code parallel prim's algorithm on openmp , need make work on xeon phi. please, me. cannot understand how this. here code on openmp.

void parallelprim(double *pmatrix, ttreenode** pminspanningtree, int size) {     int lastadded;     tgraphnode nearestnode;     tgraphnode **notinminspanningtree = new tgraphnode* [size-1];     lastadded = 0;  for(int = 0; < size-1; i++) {     notinminspanningtree[i] = new tgraphnode;     notinminspanningtree[i]->nodenum = i+1;     notinminspanningtree[i]->distance = -1.0f;     notinminspanningtree[i]->parentnodenum = -1; }  for(int iter = 1; iter < size; iter++) {     #pragma omp parallel          for(int = 0; < size-1; i++)             if(notinminspanningtree[i] != null)             {                 double t1 = notinminspanningtree[i]->distance;                 double t2 = pmatrix[(notinminspanningtree[i]->nodenum) * size + lastadded];                 if(((t1 < 0) && (t2 > 0)) || (t1>0) && (t2 > 0) && (t1 > t2))                 {                     notinminspanningtree[i]->distance = t2;                     notinminspanningtree[i]->parentnodenum = lastadded;                 }             }          nearestnode.nodenum = -1;         nearestnode.distance = 3000; #pragma omp parallel         {             tgraphnode threadnearestnode;             threadnearestnode.nodenum = -1;             threadnearestnode.distance = 3000;             #pragma omp                  for(int = 0; < size-1; i++)                 {                 if(notinminspanningtree[i] != null)                 {                     double t1 = notinminspanningtree[i]->distance;                     double t2 = threadnearestnode.distance;                     if((t1 > 0) && (t1 < t2) )                     {                         threadnearestnode.distance = t1;                         threadnearestnode.nodenum = notinminspanningtree[i]->nodenum;                     }                 }             } #pragma omp critical             {                 if(threadnearestnode.distance < nearestnode.distance)                 {                     nearestnode.distance = threadnearestnode.distance;                     nearestnode.nodenum = threadnearestnode.nodenum;                 }             }         }         pminspanningtree[nearestnode.nodenum] = new ttreenode;          pminspanningtree[nearestnode.nodenum]->nodenum = notinminspanningtree[nearestnode.nodenum-1]->parentnodenum;         pminspanningtree[nearestnode.nodenum]->distance = nearestnode.distance;          int parent = notinminspanningtree[nearestnode.nodenum-1]->parentnodenum;         if(pminspanningtree[parent] != null)         {            ttreenode *tmp = new ttreenode;             tmp->distance = nearestnode.distance;             tmp->nodenum = nearestnode.nodenum;         }         else         {             pminspanningtree[parent] = new ttreenode;             pminspanningtree[parent]->distance = nearestnode.distance;             pminspanningtree[parent]->nodenum = nearestnode.nodenum;         }         lastadded = nearestnode.nodenum;         delete notinminspanningtree[nearestnode.nodenum - 1];         notinminspanningtree[nearestnode.nodenum - 1] = null;     }     delete[] notinminspanningtree; }

you have 2 basic options running code on intel xeon phi coprocessor. can compile entire program -mmic , -qopenmp flags , run using either micnativeloadex or copying executable , required libraries on coprocessor scp. alternately, can omit -mmic , instead modify code portion of code want run on coprocessor falls inside offload section portion of code sent coprocessor run , remainder of code run on host.

the presentation avi sent lovely overview of programming coprocessor. in addition can find basic information on compiling , optimizing coprocessor at: https://software.intel.com/en-us/articles/programming-and-compiling-for-intel-many-integrated-core-architecture.

however, , big however, code not vectorize , has significant serial sections. obtain optimum performance on coprocessor, code must both vectorize , parallelize.


Comments

Post a Comment

Popular posts from this blog

angularjs - ADAL JS Angular- WebAPI add a new role claim to the token -

i have created angular spa webapi backend using adal js authentication.as there no roles in ad, need manually add role claims in order give users access different api controllers. the roles stored in database. expecting inject claim through call webapi after authentication ad. webapi code might this. identity.addclaim(new claim("role", "user")); var ticket = new authenticationticket(identity, props); var accesstoken = startup.oauthbeareroptions.accesstokenformat.protect(ticket); is possible replace adal idtoken new token? is viable solution or there other better way handle this? as initial token generated azuread, possible edit token add new claim? appreciated. graph api supporting group claims. see here: http://justazure.com/azure-active-directory-part-4-group-claims/ if @ examples on page, users assigned groups , app can check group in claims. in current version of portal, need app manifest , modify it.
Read more

node.js - Using Node without global install -

i'm working on few node & electron (atom shell) projects , i'm curious how them work without user having install node globally. i've seen few applications including node directory in project contains node.exe binary. how go setting node project use binary? edit: thought should add, i've searched everywhere answer this, unrelated results.
Read more

php - CakePHP HttpSockets send array of paramms -

i problem when make request (i can request). $link = 'http://uri/path/?param1=1&sid=2&sid=3&sid=4' $http = $httpsocket = new httpsocket(); $res = $httpsocket->get($link); if check request pr($http); i see : [line] => /url/path/?param1=1&sid%5b0%5d=2&sid%5b1%5d=3&sid%5b2%5d=4 http/1.1 and i'm getting empty response because server doesn't know parameters sid%5b0%5d=2 when try send parameters array : $data = array('param1' => '1', 'sid' => array('2','3', '4')); i see same changes %5b0%5d - additional indexes. how fix it? unfortunately , can not change server side, if send request in browser, i'll normal response in json format. when make request, can parameters this: $param1 = $_get['param1']; $sid= $_get['sid']; tip: use diferente names parameters. have multiples sid. use sid1, sid2, sid3... update: can parameters this:...
Read more