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How to speed up reading a file ?

Charley Chen

Hi All,

 I read a file which has 1386213 line  or more , only read each line  , it spend  7 minutes  and above.

How can it speed up ?

 

procedure( QQ(file)
   prog( ()
      inPort=infile(file)
           while( gets(inLine inPort)

               ........
           ) ;if
      ) ;while
       inPort=nil
  ) ;prog
) ;procedure

 

Thank you,

Charley

Parents
  • Charley Chen
    Andrew,

    I think the problem is not exactlly in while (gets(nextLine inPort) ..

    I compare two case , one is   qq = parseString(nextLine “\n”)  ;; once

                                   two is   qq = parseString(nextLine “\n”) ; once

                                                qq = parseString(car(qq) " ") ; twice

    The problem is the more "parseString" you use the more time it needs

    But I need to do twice parseString to (1) remove \n (2) convert to list  to get date

    Is ther any command to to that ?

    Thank you,

    Charley

     ;Write filegetCurrentTime()outPort=outfile(“test”)for(I 0 100000000   fprintf(outPort “%s%d\n” “TEST” i));forclose(outPort)getCurrentTime()  ;Read filegetCurrentTime()inPort=infile(“test”)while(gets(nextLine inPort)

               qq = parseString(nextLine “\n”)
               qq = parseString(car(qq) " ");inPort = nilgetCurrentTime()
Reply
  • Charley Chen
    Andrew,

    I think the problem is not exactlly in while (gets(nextLine inPort) ..

    I compare two case , one is   qq = parseString(nextLine “\n”)  ;; once

                                   two is   qq = parseString(nextLine “\n”) ; once

                                                qq = parseString(car(qq) " ") ; twice

    The problem is the more "parseString" you use the more time it needs

    But I need to do twice parseString to (1) remove \n (2) convert to list  to get date

    Is ther any command to to that ?

    Thank you,

    Charley

     ;Write filegetCurrentTime()outPort=outfile(“test”)for(I 0 100000000   fprintf(outPort “%s%d\n” “TEST” i));forclose(outPort)getCurrentTime()  ;Read filegetCurrentTime()inPort=infile(“test”)while(gets(nextLine inPort)

               qq = parseString(nextLine “\n”)
               qq = parseString(car(qq) " ");inPort = nilgetCurrentTime()
Children
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