<div> Jason, Cino, I've done the same as you did, Cino (I also added a gmp_version printf at the beginning of "main") - I'm using GMP 4.2.2, program compiled using GCC 4.1.3. System was a Dell Inspiron 510m laptop (Pentium M 1.60GHz, 1GB RAM) running Ubuntu 7.10 (Gutsy Gibbon). jdo@BlackHole:~/code/gmp-chudnovsky$ ./gmp-chudnovsky 10000000 1 GNU MP version 4.2.2 #terms=705136, depth=21 sieve   time =  0.400 ................................................... bs      time = 74.180 gcd     time = 13.660 div     time = 10.090 sqrt    time =  5.560 mul     time =  3.820 total   time = 94.090    P size=14561191 digits (1.456119)    Q size=14561184 digits (1.456118) pi(0,705136)= Time to save to zpi.txt = 55.130 jdo@BlackHole:~/code/gmp-chudnovsky$ ls -alrt zpi.txt -rw-r--r-- 1 jdo jdo 10000006 2007-11-11 14:09 zpi.txt <blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;">----- Original Message ----- From: "cino hilliard" <hillcino368@hotmail.com> To: gmp-discuss@swox.com Subject: RE: Chudnovski to file Windows xp Date: Sat, 10 Nov 2007 20:16:36 -0600 Hi, Here is a re-send in Plain text. Cino Hilliard ________________________________ From: hillcino368@hotmail.com To: gmp-discuss@swox.com Subject: RE: Chudnovski to file Windows xp Date: Sat, 10 Nov 2007 17:11:16 -0600 > Today's Topics: > > 1. Re: Low efficiency of the mpf_out_str function ! (Jason Lin) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Fri, 9 Nov 2007 21:21:01 +0800 (CST) > From: Jason Lin Subject: Re: Low efficiency of the mpf_out_str function ! > To: Jan Doornaert Cc: gmp-discuss@swox.com > Message-ID: Content-Type: text/plain; charset=big5 > >> Jason, >> >> Have you tried running the program with output NOT >> to stdout, but to >> file? > > yes, both to stdout and to file are the same ! > > >> I don't think the "conversion" from GMP-internal >> format to decimal takes >> *that* much time, but the actual formatted output >> on-screen (think >> "printf") might slow things down (especially for the >> number of characters >> you're outputting)... > > 1. I don't think either ! but I must emphasis that the > code was compiles on DJGPP 2.03 with GMP 4.1.2 . I am > not sure if the GMP 4.2.2 have the same problem. > > 2. I don't think the bottleneck is the printf > function. > because the output screen ceased there for a long time > before the mess digits bursting out. It is the > mpf_out_str cause the ceasing ! (and the printf give > the bursting out digits almost in second) > > 3. Today I tried to compile the code with DEV-CPP > 4.9.9.2 with GMP4.1.? (pre compiled. download from > http://old.devpaks.org/list.php?category=Mathematics) > but the results is more worse, try to calculate more > than 500000 digits will get a runtime error.(general > protection error for OP code I think !) > > 4.The program Chudnovsky.c can be download from > http://gmplib.org/pi-with-gmp.html > Can some one give it a try ?? (with GMP 4.1.2) Hi, System: p4 2.53 ghz 2 gig ram windows xp pro I am running mingw gcc 4.1.2 GMP 4.2.2 built (dynamic) with instructions from http://cs.nyu.edu/exact/core/gmp/ For chudnovski.c. I renamed this to chudpi.c and modified it a little for output and timing. Add the following in main FILE *fptr1; char fil[] = "zpi.txt"; fptr1=fopen(fil,"w"); Modify the output if statement if (out&1) { begin = clock(); printf("pi(0,%ld)=\n", terms); //mpf_out_str(stdout, 10, d+2, qi); mpf_out_str(fptr1, 10, d+2, qi); end = clock(); printf("Time to save to %s = %6.3f\n",fil, (double)(end-begin)/CLOCKS_PER_SEC); printf("\n"); } Run for 10 million f:\GmpGcc>chudpi 10000000 1 #terms=705136, depth=21 sieve time = 0.296 ................................................... bs time = 64.391 gcd time = 11.306 div time = 9.031 sqrt time = 5.172 mul time = 3.484 total time = 82.437 P size=14561191 digits (1.456119) Q size=14561184 digits (1.456118) pi(0,705136)= Time to save to zpi.txt = 48.563 f:\GmpGcc>dir zpi.txt Volume in drive F is New Volume Volume Serial Number is 186E-0843 Directory of f:\GmpGcc 11/10/2007 04:45 PM 10,000,006 zpi.txt 1 File(s) 10,000,006 bytes 0 Dir(s) 451,460,153,344 bytes free For gmp 4.1. I get an error for over 500,000 also Cino Hilliard _______________________________________________ gmp-discuss mailing list gmp-discuss@swox.com https://gmplib.org/mailman/listinfo/gmp-discuss </hillcino368@hotmail.com></blockquote> </div> -- <div> Want an e-mail address like mine? Get a free e-mail account today at <a href="http://www.mail.com/Product.aspx" target="_blank">www.mail.com</a>!</div>