From 8bce8632c520acea86b4a6b2b7cf3eafe7964124 Mon Sep 17 00:00:00 2001
From: Ian Jauslin <ian@jauslin.org>
Date: Wed, 18 May 2022 23:52:01 +0200
Subject: Multithread fft

---
 src/main.c | 30 ++++++++++++++++++++++--------
 1 file changed, 22 insertions(+), 8 deletions(-)

(limited to 'src/main.c')

diff --git a/src/main.c b/src/main.c
index 904b5bf..5c7baf7 100644
--- a/src/main.c
+++ b/src/main.c
@@ -13,7 +13,7 @@
 int print_usage();
 
 // read command line arguments
-int read_args(int argc, const char* argv[], char** params, unsigned int* driving_force, unsigned int* command);
+int read_args(int argc, const char* argv[], char** params, unsigned int* driving_force, unsigned int* command, unsigned int* nthreads);
 int read_params(char* params, int* K1, int* K2, int* N1, int* N2, unsigned int* nsteps, double* nu, double* delta, unsigned int* print_freq);
 int set_parameter(char* lhs, char* rhs, int* K1, int* K2, int* N1, int* N2, unsigned int* nsteps, double* nu, double* delta, unsigned int* print_freq, bool* setN1, bool* setN2);
 
@@ -38,12 +38,13 @@ int main (
   int ret;
   unsigned int driving,command;
   unsigned int print_freq;
+  unsigned int nthreads=1;
 
   command=0;
   driving=0;
 
   // read command line arguments
-  ret=read_args(argc, argv, &params, &driving, &command);
+  ret=read_args(argc, argv, &params, &driving, &command, &nthreads);
   if(ret<0){
     return(-1);
   }
@@ -65,13 +66,13 @@ int main (
 
   // run command
   if (command==COMMAND_UK){
-    uk(K1, K2, N1, N2, nsteps, nu, delta, g, print_freq);
+    uk(K1, K2, N1, N2, nsteps, nu, delta, g, print_freq, nthreads);
   }
   else if(command==COMMAND_ENSTROPHY){
-    enstrophy(K1, K2, N1, N2, nsteps, nu, delta, g, print_freq);
+    enstrophy(K1, K2, N1, N2, nsteps, nu, delta, g, print_freq, nthreads);
   }
   else if(command==COMMAND_QUIET){
-    quiet(K1, K2, N1, N2, nsteps, nu, delta, g);
+    quiet(K1, K2, N1, N2, nsteps, nu, delta, g, nthreads);
   }
   else if(command==0){
     fprintf(stderr, "error: no command specified\n");
@@ -90,14 +91,17 @@ int print_usage(){
 // read command line arguments
 #define CP_FLAG_PARAMS 1
 #define CP_FLAG_DRIVING 2
+#define CP_FLAG_NTHREADS 3
 int read_args(
   int argc,
   const char* argv[],
   char** params,
   unsigned int* driving_force,
-  unsigned int* command
+  unsigned int* command,
+  unsigned int* nthreads
 ){
   int i;
+  int ret;
   // pointers
   char* ptr;
   // flag that indicates what argument is being read
@@ -109,14 +113,15 @@ int read_args(
     if(argv[i][0]=='-'){
       for(ptr=((char*)argv[i])+1;*ptr!='\0';ptr++){
 	switch(*ptr){
-	// timestep
 	case 'p':
 	  flag=CP_FLAG_PARAMS;
 	  break;
-	// nsteps
 	case 'g':
 	  flag=CP_FLAG_DRIVING;
 	  break;
+	case 't':
+	  flag=CP_FLAG_NTHREADS;
+	  break;
 	default:
 	  fprintf(stderr, "unrecognized option '-%c'\n", *ptr);
 	  print_usage();
@@ -141,6 +146,15 @@ int read_args(
       }
       flag=0;
     }
+    // nthreads
+    else if(flag==CP_FLAG_NTHREADS){
+      ret=sscanf(argv[i],"%u",nthreads);
+      if(ret!=1){
+	fprintf(stderr, "error: '-t' should be followed by an unsigned integer\n       got '%s'\n",argv[i]);
+	return(-1);
+      }
+      flag=0;
+    }
     // computation to run
     else{
       if(strcmp(argv[i], "uk")==0){
-- 
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