is it sofware or hardware problem?

truffaldino · June 26, 2012, 09:10

I have a problem with speed of execution for the program written in fortran 90/95.

I have two computers: one is a simple desctop and another is multi-core laptop with faster processors, bigger memories etc. Both computers have 64-bit windows on them. I expected that the program will run faster on sophisticated laptop.

But it turns out that some subroutines in the program go 3 times slower on "sophisticated" machine, while other subroutines go with approximately the same speed.

Is it sofware or hardware problem? I was using silverfrost FTN95 free personal edition compiler for the program.

Will be grateful for your input

Truffaldino

CapSizer · June 26, 2012, 14:16

You are going to have to be a lot more specific if you want any useful advice, such as the exact specifications of the two computers and their operating systems.

abdul099 · July 6, 2012, 21:34

Not only that. There might be a lot of differences in the subroutines. For example, what is the common thing of all "slow" subroutines? Lot of integer calculations? Lot of floating point calculations? Lot of memory access? Lot of communication between processors? Writing to hard disks?

All of that could have an influence, and some could be related to the hardware while other stuff could be just the software not adopted to the hardware.

June 26, 2012, 09:10	is it sofware or hardware problem?	#1
truffaldino Senior Member Join Date: Jan 2011 Posts: 249 Blog Entries: 5 Rep Power: 17	I have a problem with speed of execution for the program written in fortran 90/95. I have two computers: one is a simple desctop and another is multi-core laptop with faster processors, bigger memories etc. Both computers have 64-bit windows on them. I expected that the program will run faster on sophisticated laptop. But it turns out that some subroutines in the program go 3 times slower on "sophisticated" machine, while other subroutines go with approximately the same speed. Is it sofware or hardware problem? I was using silverfrost FTN95 free personal edition compiler for the program. Will be grateful for your input Truffaldino

July 6, 2012, 21:34		#3
abdul099 Senior Member Join Date: Oct 2009 Location: Germany Posts: 636 Rep Power: 22	Not only that. There might be a lot of differences in the subroutines. For example, what is the common thing of all "slow" subroutines? Lot of integer calculations? Lot of floating point calculations? Lot of memory access? Lot of communication between processors? Writing to hard disks? All of that could have an influence, and some could be related to the hardware while other stuff could be just the software not adopted to the hardware. __________________ We do three types of jobs here: GOOD, FAST AND CHEAP You may choose any two!

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June 26, 2012, 14:16		#2
CapSizer Senior Member Charles Join Date: Apr 2009 Posts: 185 Rep Power: 18	You are going to have to be a lot more specific if you want any useful advice, such as the exact specifications of the two computers and their operating systems.