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- Напоминаю, что масса вопросов по функционированию форума снимается после прочтения его описания.
- Новичкам также крайне полезно ознакомиться с данным документом.
По поводу Pentium 4 17.03.02 23:08 Число просмотров: 1697
Автор: Mishka Статус: Незарегистрированный пользователь
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> Подскажите, как обстоит дело у этого процессора с
> производительностью под клиентом ? Стоит ли вообще ставить
> коровок на Р4-1500 ?
Vot tut para ssylok proyasnyayuschie problemu:
http://n0cgi.distributed.net/faq/cache/264.html
From: Nathaniel Cameron Begeman
nbegeman@engin.umich.edu
Subject: Speed table
Date sent: Tue, 27 Nov 2001 03:05:59 -0500
The following is a selection of RC5 core/processor speeds on the
various machines at my disposal. Unless otherwise specified, the
core used is the one that was automatically selected.
The Clocks/key column is the number of processor cycles required
to process one key. The keys/s/MHz column is the crunch rate per
Mhz.
Processor Clocks/key keys/s/MHz
68000 81
68010 85
68020 361
68030 384
386/386SX 2040 490
386/386SX(SMC) ~1350 740 (Latest self-modifying core.
Estimate)
68040 907
486/486SX 1020 980
Itanium (GCC 3) 980 1020
486/486SX(SMC) 960 1040 (Latest self-modifying core)
Pentium 700 1430
P4 700 1430 (4 clock latency on rotate
left!!!)
AMD K6/K6-2/K6-3 610 1640
UltraSparc II 507 1980
Pentium-MMX 485 2060
PowerPC 601 421 2375 (allitnil)
Celeron/PII/PIII 340 2940
68060 3030
AMD K5 310 3220
PowerPC 603/604 296 3378 (lintilla)
Athlon 290 3450
PowerPC G4 110.25 9070 (AltiVec)
=================================================
http://n0cgi.distributed.net/faq/cache/55.html
Why are PowerPC-based and (most) Intel-based
computers so much faster than other platforms on
RC5-64?
Integral to the mathematics of the RC5 algorithm
are 32-bit rotate operations.
For whatever reason, the designers of the IA32
(32bit Intel x86) and the PowerPC architectures
decided to implement the rotate function as a
hardware instruction.
Many other CPUs do not have built-in hardware rotate
instructions and must emulate the operation by (at
the very least) two shifts and a logical OR. This
handicap is why many non-32bit-Intel [1] and
non-PowerPC computers run RC5 slower than one
might expect based on real-world benchmarks. It is
also the main reason why the RC5 client is a poor
benchmark to use in determining the speed or
performance of a particular CPU.
[1] The IA32 architecture is that used by the
Intel 80386, 80486, Pentium, Pentium Pro, Pentium II,
Pentium III and Pentium 4 processors. The Pentium 4
does not however have a hardware rotate instruction.
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