how can i test performance

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maslan

Joined: 08 Sep 2003
Posts: 54

maslan 08 Jul 2004, 11:13

hi guys
if i've 2 pieces of diff. code which do the same perpose how can i test the performance of each to know which one works faster and so on like that :
the 1st i wrote

Code:

SYS_PRINT:              ; ESI:STRING OFFSET
        MOV     EBX, 00000001h
        MOV     ECX, ESI
        PRINT_LOOP:
        MOV     AL, [ECX]
        OR      AL, AL
        JZ      PRINT_END
        MOV     EAX, 00000004h
        MOV     EDX, 00000001h
        INT     80h
        INC     ECX
        JMP     PRINT_LOOP
        PRINT_END:
        MOV     ESI, ECX
        RET

and the other one taken from fasm source

Code:

SYS_PRINT:              ; ESI:STRING OFFSET
        MOV     EDI,ESI
        MOV     EDX,ESI
        OR      ECX,-1
        XOR     AL,AL
        REPNE   SCASB
        NEG     ECX
        SUB     ECX,2
        MOV     EAX,4
        MOV     EBX,1
        XCHG    ECX,EDX
        INT     80h
        RET

when i compiled them the 1st is 38 bytes and the 2nd is 39 bytes
so i want to test the performance and the speed for this example Shocked

thanks

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Maslan
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08 Jul 2004, 11:13

crc

Joined: 21 Jun 2003
Posts: 637
Location: Penndel, PA [USA]

crc 08 Jul 2004, 11:40

If you're running under Linux, use the 'time' program:

fasm program1.asm program1
chmod +x program1
time ./program1

And repeat for each modified version. It's best to time the program a couple of times and average the results. Seriously though, performance of output isn't the easiest thing to optomize anyway: you're bound by the kernel's internal routines!

08 Jul 2004, 11:40

maslan

Joined: 08 Sep 2003
Posts: 54

maslan 08 Jul 2004, 12:05

ya sure i use linux & also freebsd and minix
i heard about time command may be when building linux from scratch

but i've 2 computers , so i think i will test it on both machines for more accurate results (p3 450M,p4 2.6G)

thanks for ur quick reply Razz

08 Jul 2004, 12:05

pelaillo
Missing in inaction

Joined: 19 Jun 2003
Posts: 878
Location: Colombia

pelaillo 08 Jul 2004, 12:43

Hi Maslan,

Have you tested the methods shown on the following thread? http://board.flatassembler.net/topic.php?t=496

08 Jul 2004, 12:43

fasm9

Joined: 19 Jun 2003
Posts: 439

fasm9 09 Jul 2004, 00:40

OProfile - A System Profiler for Linux
http://oprofile.sf.net

BTW, whatever you want in Linux, it is in Kernel! so need kernel-compile.

debian:/usr/src/linux-2.6.7#make menuconfig

enable Oprofiler, if you want kernel hacking with FASM, also, enable Kernel hacking option.

http://kerneltrap.org
--
bk20+ck4(staircase 7.9)+fusion-full-linux 2.6.3

09 Jul 2004, 00:40

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