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

by Marshall (Prior)
on Dec 03, 2009 at 22:28 UTC ( #810969=note: print w/ replies, xml ) Need Help??


in reply to Re^5: better (faster) way of writing regexp
in thread 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 (Pope) 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

    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% --

    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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