RE: Floating point performance

2001-01-29 Thread Simon Marlow
> Fri, 26 Jan 2001 17:40:17 +0100, Jan Kort <[EMAIL PROTECTED]> pisze: > > > I made a profile and it says most of the time (93%) is spent in > > the function bar. > > Did you compile with optimization turned on (option -O)? > I see similar results without -O but quite different with -O. Withou

Re: Floating point performance

2001-01-29 Thread Marcin 'Qrczak' Kowalczyk
Mon, 29 Jan 2001 18:15:02 +0100, Jan Kort <[EMAIL PROTECTED]> pisze: > I didn't use any optimizations, but I am sure that > passing -O to ghc will make it see that 1*1*... is a > constant expression. It does not, because it's n*1*1*1*... where n is not a constant. Major advantages seem to be fro

Re: Floating point performance

2001-01-29 Thread Jan Kort
"Julian Seward (Intl Vendor)" wrote: > > I tried this, with ghc-4.08.1 -O both with and without > profiling, on a Sparc box of I believe around 300 MHz, > and I can't reproduce it at all. Without profiling, > it allocates about 505 k of heap and runs in 0.02 > seconds. > > Ummm ? > > J I didn

RE: Floating point performance

2001-01-29 Thread Julian Seward (Intl Vendor)
EMAIL PROTECTED]] | Sent: Friday, January 26, 2001 4:40 PM | To: [EMAIL PROTECTED] | Subject: Floating point performance | | | Hi, | I noticed ghc (version 4.08.1) floating point performance is | really slow on my computer: a 270Mhz sun ultra5. The program | below does 1 milion floating

Re: Floating point performance

2001-01-26 Thread Marcin 'Qrczak' Kowalczyk
Fri, 26 Jan 2001 17:40:17 +0100, Jan Kort <[EMAIL PROTECTED]> pisze: > I made a profile and it says most of the time (93%) is spent in > the function bar. Did you compile with optimization turned on (option -O)? I see similar results without -O but quite different with -O. -- __("< Marcin Ko

Floating point performance

2001-01-26 Thread Jan Kort
Hi, I noticed ghc (version 4.08.1) floating point performance is really slow on my computer: a 270Mhz sun ultra5. The program below does 1 milion floating point multiplications and takes 2 seconds to run. I made a profile and it says most of the time (93%) is spent in the function bar. Any idea