Multiprocessing not working

[Puneet-Singh1996]

 import multiprocessing
 from multiprocessing import Pool
 
 class pdf_gen():
   def __init__(self):
     pdf = self.pdf = FPDF()
     pdf.set_auto_page_break(True,0.1)
   
   def get_data_from_mysql(self) :
     pdf = self.pdf
     # connection is established and result is stored in 'res'.
     dup = []
     dup.insert(0,res)
     z = tuple(dup)
     return z

   def mysql_to_pdf_data(self,*result) :
     try : 
       pdf = self.pdf 
       # Entered data need to be in pdf
     finally : 
       pdf.output('save_pdf.pdf','F')

 def main() :
   pdf = pdf_gen()
   recover_data = pdf.get_data_from_mysql()
   pool = multiprocessing.Pool(multiprocessing.cpu_count())
   pool.map(pdf.mysql_to_pdf_data,recover_data)

Below picture shows that CPU was using only 1 core instead 2 were there.

[kute]

May be your recover_data.size is less than multiprocessing.cpu_count().

multiprocessing.cpu_count() is 8 in my own, when the size of get_data_from_mysql() return is less than 8, it depends on your data'size for your process