From 0fbccda615fa0b15b048b5723e5bfb359f95cd9a Mon Sep 17 00:00:00 2001
From: Connor Moore <connor@hhmoore.ca>
Date: Sat, 25 Apr 2026 17:47:35 -0400
Subject: Initial commit with code and start of report

---
 manager.f90 | 79 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 manager.f90

(limited to 'manager.f90')

diff --git a/manager.f90 b/manager.f90
new file mode 100644
index 0000000..de85dde
--- /dev/null
+++ b/manager.f90
@@ -0,0 +1,79 @@
+subroutine manager
+use globals
+use auxiliary
+implicit none
+logical :: start(1:num_procs-1)
+integer :: seed,ierr,recvd=0,worker,exit_tags_sent,tag,ndat,p,failed
+integer, dimension(mpi_status_size) :: status
+double precision :: buf
+double precision, allocatable, dimension(:) :: eigs
+
+! Set matrix size and number of eigenvalues
+call init(ndat)
+! Broadcast matrix size
+call mpi_bcast(n,1,MPI_INTEGER,0,MPI_COMM_WORLD,ierr)
+! Allocate array for received eigenvalues
+allocate(eigs(ndat))
+
+start=.true.
+exit_tags_sent=0
+failed=0
+open(22,file='eigs')
+write(22,'(i0,i0)') n, ndat
+
+! Receive data until at least ndat have been received
+do while(.true.)
+   ! For each worker check if a seed is needed
+   do p=1,num_procs-1
+      if(start(p)) then
+         call get_random_seed(seed)
+         if(recvd.lt.ndat-num_procs+2) then
+            tag=DEFAULT_TAG
+         else
+            tag=EXIT_TAG
+            exit_tags_sent=exit_tags_sent+1
+         end if
+         call mpi_send(seed,1,MPI_INTEGER,p,tag,MPI_COMM_WORLD,ierr)
+!         print *,'Manager sent seed ',seed,' to worker ',p
+         start(p)=.false.
+      end if
+   end do
+   if(exit_tags_sent.eq.num_procs-1) then
+      print *,'Manager exiting...'
+      exit
+   end if
+   
+   call mpi_recv(buf,1,MPI_DOUBLE_PRECISION,MPI_ANY_SOURCE,MPI_ANY_TAG,MPI_COMM_WORLD,status,ierr)
+   worker = status(MPI_SOURCE)
+   tag = status(MPI_TAG)
+   if(tag.eq.0) then
+      recvd=recvd+1
+      eigs(recvd)=buf
+      write(22,'(i4,e14.7)') worker,buf
+   else
+      failed=failed+1
+      print '(i5,a7,i5,a8)',recvd,' received, ',failed,' failed'
+   end if
+   start(worker)=.true.
+end do
+
+close(22)
+
+deallocate(eigs)
+return
+end subroutine manager
+
+subroutine init(ndat)
+use globals
+implicit none
+integer :: ndat
+
+! Matrix dimension and sample size.. hard-coded now, but can be read from command line or file...
+!read(*,*) n
+!read(*,*) ndat
+
+n=4096
+ndat=2048
+
+return
+end subroutine init
-- 
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