Re^6: better (faster) way of writing regexp

Interesting...

The ratio's aren't the same as on my machine, but it appears that substr() is pretty quick on both of our machines.

I don't know a Linux utility for this, but in the Windows world, CPU-Z http://www.cpuid.com/cpuz.php shows a lot of info about processors... It is hard for me to imagine that you don't have at least a multi-threaded processor given the raw speed of your machine for a single thread.

If I run two "number cruncher" apps at once, the performance is not 2x, but rather like 1.4x. I have old memory technology and my machine becomes memory bound. To Windows XP Pro, my machine looks pretty much like 2 CPU's except that 1+1 != 2, only about 1.4! And of course when I do that, my computer turns into a "space heater"!. When the winter gets colder, I run some BOINC project like seti@home, etc. on the theory that I might as well be doing something at least marginally useful while I am generating heat! Anyway this is what I have:(in the scheme of things, a Prescott is a wimp)

Processor 1 (ID = 0)
Number of cores        1 (max 1)
Number of threads    2 (max 2)
Name            Intel Pentium 4
Codename        Prescott
Specification        Intel(R) Pentium(R) 4 CPU 3.00GHz
Package            Socket 478 mPGA (platform ID = 2h)
CPUID            F.4.1
Extended CPUID        F.4
Core Stepping        E0
Technology        90 nm
Core Speed        3015.1 MHz (15.0 x 201.0 MHz)
Rated Bus speed        804.0 MHz
Stock frequency        3000 MHz
Instructions sets    MMX, SSE, SSE2, SSE3
L1 Data cache        16 KBytes, 8-way set associative, 64-byte line si
+ze
Trace cache        12 Kuops, 8-way set associative
L2 cache        1024 KBytes, 8-way set associative, 64-byte line size
FID/VID Control        no
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Re^7: better (faster) way of writing regexp by ikegami (Patriarch) on Dec 03, 2009 at 22:38 UTC
I "win"! :) My machine, not the one I ran the benchmark on: Number of cores 1 (max 1) Number of threads 1 (max 1) Name Intel Pentium 4 Codename Northwood Specification Intel(R) Pentium(R) 4 CPU 2.66GHz Package (platform ID) Socket 478 mPGA (0x2) CPUID F.2.7 Extended CPUID F.2 Brand ID 9 Core Stepping C1 Technology 0.13 um Core Speed 2004.5 MHz Multiplier x FSB 20.0 x 100.2 MHz Rated Bus speed 400.9 MHz Stock frequency 2666 MHz Instructions sets MMX, SSE, SSE2 L1 Data cache 8 KBytes, 4-way set associative, 64-byte line +size Trace cache 12 Kuops, 8-way set associative L2 cache 512 KBytes, 8-way set associative, 64-byte lin +e size FID/VID Control no [download] From that machine: `This is Perl 5.010001 Rate range repeat isook unpack substr range 117311/s -- -6% -7% -24% -81% repeat 124414/s 6% -- -2% -20% -80% isook 126456/s 8% 2% -- -18% -79% unpack 155069/s 32% 25% 23% -- -74% substr 607361/s 418% 388% 380% 292% --` [download] I'm scared of looking at the stats of my tv computer (aka Frankenputer). It's some kind of P3, for starters.	[reply] [d/l] [select]

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Re^7: better (faster) way of writing regexp
by ikegami (Patriarch) on Dec 03, 2009 at 22:38 UTC

I "win"! :) My machine, not the one I ran the benchmark on:

Number of cores         1 (max 1)
Number of threads       1 (max 1)
Name                    Intel Pentium 4
Codename                Northwood
Specification           Intel(R) Pentium(R) 4 CPU 2.66GHz
Package (platform ID)   Socket 478 mPGA (0x2)
CPUID                   F.2.7
Extended CPUID          F.2
Brand ID                9
Core Stepping           C1
Technology              0.13 um
Core Speed              2004.5 MHz
Multiplier x FSB        20.0 x 100.2 MHz
Rated Bus speed         400.9 MHz
Stock frequency         2666 MHz
Instructions sets       MMX, SSE, SSE2
L1 Data cache           8 KBytes, 4-way set associative, 64-byte line 
+size
Trace cache             12 Kuops, 8-way set associative
L2 cache                512 KBytes, 8-way set associative, 64-byte lin
+e size
FID/VID Control         no
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From that machine:

This is Perl 5.010001
           Rate  range repeat  isook unpack substr
range  117311/s     --    -6%    -7%   -24%   -81%
repeat 124414/s     6%     --    -2%   -20%   -80%
isook  126456/s     8%     2%     --   -18%   -79%
unpack 155069/s    32%    25%    23%     --   -74%
substr 607361/s   418%   388%   380%   292%     --
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I'm scared of looking at the stats of my tv computer (aka Frankenputer). It's some kind of P3, for starters.

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