先日、The IBM 1401 Demo Lab and Restoration Project Computer History Museum で、dhrystoneベンチマークのソースコードを発見したので、動くかどうか試してみよう。
https://ibm-1401.info/Dhrystone.html
ソースコードは dry.c らしい。ソースの中にベンチマークのリザルトまで書いてあるという豪快な構成になってるし、関数プロトタイプ宣言を使わず、昔のK&R本にあったような構成。enum型が使えないコンパイラとかにも対応してるようで、物凄く古いソースコードの雰囲気が漂っている。NULL値やbool型相当の値に入れるTRUEやFALSEの値も自分で #define してるぐらいだ。
バージョンは C/1.1 で1984年12月1日リリース。コードのアップデートは1986年1月6日、ベンチマーク結果のリスト部分は1986年3月31日にアップデートされているらしい。
そのまま 手元のLinux(AMD64)機に入れてコンパイルしてみると、結構な数のWarningが出たので、ちょっと手を入れてみた。
dhrystone1.c
/***** hpda:net.sources / homxb!gemini / 1:58 am Apr 1, 1986*/
/* EVERBODY: Please read "APOLOGY" below. -rick 01/06/85
* See introduction in net.arch, or net.micro
*
* "DHRYSTONE" Benchmark Program
*
* Version: C/1.1, 12/01/84
*
* Date: PROGRAM updated 01/06/86, RESULTS updated 03/31/86
*
* Author: Reinhold P. Weicker, CACM Vol 27, No 10, 10/84 pg. 1013
* Translated from ADA by Rick Richardson
* Every method to preserve ADA-likeness has been used,
* at the expense of C-ness.
*
* Compile: cc -O dry.c -o drynr : No registers
* cc -O -DREG=register dry.c -o dryr : Registers
*
* Defines: Defines are provided for old C compiler's
* which don't have enums, and can't assign structures.
* The time(2) function is library dependant; Most
* return the time in seconds, but beware of some, like
* Aztec C, which return other units.
* The LOOPS define is initially set for 50000 loops.
* If you have a machine with large integers and is
* very fast, please change this number to 500000 to
* get better accuracy. Please select the way to
* measure the execution time using the TIME define.
* For single user machines, time(2) is adequate. For
* multi-user machines where you cannot get single-user
* access, use the times(2) function. If you have
* neither, use a stopwatch in the dead of night.
* Use a "printf" at the point marked "start timer"
* to begin your timings. DO NOT use the UNIX "time(1)"
* command, as this will measure the total time to
* run this program, which will (erroneously) include
* the time to malloc(3) storage and to compute the
* time it takes to do nothing.
*
* Run: drynr; dryr
*
* Results: If you get any new machine/OS results, please send to:
*
* ihnp4!castor!pcrat!rick
*
* and thanks to all that do. Space prevents listing
* the names of those who have provided some of these
* results. I'll be forwarding these results to
* Rheinhold Weicker.
*
* Note: I order the list in increasing performance of the
* "with registers" benchmark. If the compiler doesn't
* provide register variables, then the benchmark
* is the same for both REG and NOREG.
*
* PLEASE: Send complete information about the machine type,
* clock speed, OS and C manufacturer/version. If
* the machine is modified, tell me what was done.
* On UNIX, execute uname -a and cc -V to get this info.
*
* 80x8x NOTE: 80x8x benchers: please try to do all memory models
* for a particular compiler.
*
* APOLOGY (1/30/86):
* Well, I goofed things up! As pointed out by Haakon Bugge,
* the line of code marked "GOOF" below was missing from the
* Dhrystone distribution for the last several months. It
* *WAS* in a backup copy I made last winter, so no doubt it
* was victimized by sleepy fingers operating vi!
*
* The effect of the line missing is that the reported benchmarks
* are 15% too fast (at least on a 80286). Now, this creates
* a dilema - do I throw out ALL the data so far collected
* and use only results from this (corrected) version, or
* do I just keep collecting data for the old version?
*
* Since the data collected so far *is* valid as long as it
* is compared with like data, I have decided to keep
* TWO lists- one for the old benchmark, and one for the
* new. This also gives me an opportunity to correct one
* other error I made in the instructions for this benchmark.
* My experience with C compilers has been mostly with
* UNIX 'pcc' derived compilers, where the 'optimizer' simply
* fixes sloppy code generation (peephole optimization).
* But today, there exist C compiler optimizers that will actually
* perform optimization in the Computer Science sense of the word,
* by removing, for example, assignments to a variable whose
* value is never used. Dhrystone, unfortunately, provides
* lots of opportunities for this sort of optimization.
*
* I request that benchmarkers re-run this new, corrected
* version of Dhrystone, turning off or bypassing optimizers
* which perform more than peephole optimization. Please
* indicate the version of Dhrystone used when reporting the
* results to me.
*
* RESULTS BEGIN HERE
*
*----------------DHRYSTONE VERSION 1.1 RESULTS BEGIN--------------------------
*
* MACHINE MICROPROCESSOR OPERATING COMPILER DHRYSTONES/SEC.
* TYPE SYSTEM NO REG REGS
* -------------------------- ------------ ----------- ---------------
* Apple IIe 65C02-1.02Mhz DOS 3.3 Aztec CII v1.05i 37 37
* - Z80-2.5Mhz CPM-80 v2.2 Aztec CII v1.05g 91 91
* - 8086-8Mhz RMX86 V6 Intel C-86 V2.0 197 203LM??
* IBM PC/XT 8088-4.77Mhz COHERENT 2.3.43 Mark Wiiliams 259 275
* - 8086-8Mhz RMX86 V6 Intel C-86 V2.0 287 304 ??
* Fortune 32:16 68000-6Mhz V7+sys3+4.1BSD cc 360 346
* PDP-11/34A w/FP-11C UNIX V7m cc 406 449
* Macintosh512 68000-7.7Mhz Mac ROM O/S DeSmet(C ware) 625 625
* VAX-11/750 w/FPA UNIX 4.2BSD cc 831 852
* DataMedia 932 68000-10Mhz UNIX sysV cc 837 888
* Plexus P35 68000-12.5Mhz UNIX sysIII cc 835 894
* ATT PC7300 68010-10Mhz UNIX 5.0.3 cc 973 1034
* Compaq II 80286-8Mhz MSDOS 3.1 MS C 3.0 1086 1140 LM
* IBM PC/AT 80286-7.5Mhz Venix/286 SVR2 cc 1159 1254 *15
* Compaq II 80286-8Mhz MSDOS 3.1 MS C 3.0 1190 1282 MM
* MicroVAX II - Mach/4.3 cc 1361 1385
* DEC uVAX II - Ultrix-32m v1.1 cc 1385 1399
* Compaq II 80286-8Mhz MSDOS 3.1 MS C 3.0 1351 1428
* VAX 11/780 - UNIX 4.2BSD cc 1417 1441
* VAX-780/MA780 Mach/4.3 cc 1428 1470
* VAX 11/780 - UNIX 5.0.1 cc 4.1.1.31 1650 1640
* Ridge 32C V1 - ROS 3.3 Ridge C (older) 1628 1695
* Gould PN6005 - UTX 1.1c+ (4.2) cc 1732 1884
* Gould PN9080 custom ECL UTX-32 1.1C cc 4745 4992
* VAX-784 - Mach/4.3 cc 5263 5555 &4
* VAX 8600 - 4.3 BSD cc 6329 6423
* Amdahl 5860 - UTS sysV cc 1.22 28735 28846
* IBM3090/200 - ? ? 31250 31250
*
*
*----------------DHRYSTONE VERSION 1.0 RESULTS BEGIN--------------------------
*
* MACHINE MICROPROCESSOR OPERATING COMPILER DHRYSTONES/SEC.
* TYPE SYSTEM NO REG REGS
* -------------------------- ------------ ----------- ---------------
* Commodore 64 6510-1MHz C64 ROM C Power 2.8 36 36
* HP-110 8086-5.33Mhz MSDOS 2.11 Lattice 2.14 284 284
* IBM PC/XT 8088-4.77Mhz PC/IX cc 271 294
* CCC 3205 - Xelos(SVR2) cc 558 592
* Perq-II 2901 bitslice Accent S5c cc (CMU) 301 301
* IBM PC/XT 8088-4.77Mhz COHERENT 2.3.43 MarkWilliams cc 296 317
* Cosmos 68000-8Mhz UniSoft cc 305 322
* IBM PC/XT 8088-4.77Mhz Venix/86 2.0 cc 297 324
* DEC PRO 350 11/23 Venix/PRO SVR2 cc 299 325
* IBM PC 8088-4.77Mhz MSDOS 2.0 b16cc 2.0 310 340
* PDP11/23 11/23 Venix (V7) cc 320 358
* Commodore Amiga ? Lattice 3.02 368 371
* PC/XT 8088-4.77Mhz Venix/86 SYS V cc 339 377
* IBM PC 8088-4.77Mhz MSDOS 2.0 CI-C86 2.20M 390 390
* IBM PC/XT 8088-4.77Mhz PCDOS 2.1 Wizard 2.1 367 403
* IBM PC/XT 8088-4.77Mhz PCDOS 3.1 Lattice 2.15 403 403 @
* Colex DM-6 68010-8Mhz Unisoft SYSV cc 378 410
* IBM PC 8088-4.77Mhz PCDOS 3.1 Datalight 1.10 416 416
* IBM PC NEC V20-4.77Mhz MSDOS 3.1 MS 3.1 387 420
* IBM PC/XT 8088-4.77Mhz PCDOS 2.1 Microsoft 3.0 390 427
* IBM PC NEC V20-4.77Mhz MSDOS 3.1 MS 3.1 (186) 393 427
* PDP-11/34 - UNIX V7M cc 387 438
* IBM PC 8088, 4.77mhz PC-DOS 2.1 Aztec C v3.2d 423 454
* Tandy 1000 V20, 4.77mhz MS-DOS 2.11 Aztec C v3.2d 423 458
* Tandy TRS-16B 68000-6Mhz Xenix 1.3.5 cc 438 458
* PDP-11/34 - RSTS/E decus c 438 495
* Onyx C8002 Z8000-4Mhz IS/1 1.1 (V7) cc 476 511
* Tandy TRS-16B 68000-6Mhz Xenix 1.3.5 Green Hills 609 617
* DEC PRO 380 11/73 Venix/PRO SVR2 cc 577 628
* FHL QT+ 68000-10Mhz Os9/68000 version 1.3 603 649 FH
* Apollo DN550 68010-?Mhz AegisSR9/IX cc 3.12 666 666
* HP-110 8086-5.33Mhz MSDOS 2.11 Aztec-C 641 676
* ATT PC6300 8086-8Mhz MSDOS 2.11 b16cc 2.0 632 684
* IBM PC/AT 80286-6Mhz PCDOS 3.0 CI-C86 2.1 666 684
* Tandy 6000 68000-8Mhz Xenix 3.0 cc 694 694
* IBM PC/AT 80286-6Mhz Xenix 3.0 cc 684 704 MM
* Macintosh 68000-7.8Mhz 2M Mac Rom Mac C 32 bit int 694 704
* Macintosh 68000-7.7Mhz - MegaMax C 2.0 661 709
* Macintosh512 68000-7.7Mhz Mac ROM O/S DeSmet(C ware) 714 714
* IBM PC/AT 80286-6Mhz Xenix 3.0 cc 704 714 LM
* Codata 3300 68000-8Mhz UniPlus+ (v7) cc 678 725
* WICAT MB 68000-8Mhz System V WICAT C 4.1 585 731 ~
* Cadmus 9000 68010-10Mhz UNIX cc 714 735
* AT&T 6300 8086-8Mhz Venix/86 SVR2 cc 668 743
* Cadmus 9790 68010-10Mhz 1MB SVR0,Cadmus3.7 cc 720 747
* NEC PC9801F 8086-8Mhz PCDOS 2.11 Lattice 2.15 768 - @
* ATT PC6300 8086-8Mhz MSDOS 2.11 CI-C86 2.20M 769 769
* Burroughs XE550 68010-10Mhz Centix 2.10 cc 769 769 CT1
* EAGLE/TURBO 8086-8Mhz Venix/86 SVR2 cc 696 779
* ALTOS 586 8086-10Mhz Xenix 3.0b cc 724 793
* DEC 11/73 J-11 micro Ultrix-11 V3.0 cc 735 793
* ATT 3B2/300 WE32000-?Mhz UNIX 5.0.2 cc 735 806
* Apollo DN320 68010-?Mhz AegisSR9/IX cc 3.12 806 806
* IRIS-2400 68010-10Mhz UNIX System V cc 772 829
* Atari 520ST 68000-8Mhz TOS DigResearch 839 846
* IBM PC/AT 80286-6Mhz PCDOS 3.0 MS 3.0(large) 833 847 LM
* WICAT MB 68000-8Mhz System V WICAT C 4.1 675 853 S~
* VAX 11/750 - Ultrix 1.1 4.2BSD cc 781 862
* CCC 7350A 68000-8MHz UniSoft V.2 cc 821 875
* VAX 11/750 - UNIX 4.2bsd cc 862 877
* Fast Mac 68000-7.7Mhz - MegaMax C 2.0 839 904 +
* IBM PC/XT 8086-9.54Mhz PCDOS 3.1 Microsoft 3.0 833 909 C1
* DEC 11/44 Ultrix-11 V3.0 cc 862 909
* Macintosh 68000-7.8Mhz 2M Mac Rom Mac C 16 bit int 877 909 S
* CCC 3210 - Xelos R01(SVR2) cc 849 924
* CCC 3220 - Ed. 7 v2.3 cc 892 925
* IBM PC/AT 80286-6Mhz Xenix 3.0 cc -i 909 925
* AT&T 6300 8086, 8mhz MS-DOS 2.11 Aztec C v3.2d 862 943
* IBM PC/AT 80286-6Mhz Xenix 3.0 cc 892 961
* VAX 11/750 w/FPA Eunice 3.2 cc 914 976
* IBM PC/XT 8086-9.54Mhz PCDOS 3.1 Wizard 2.1 892 980 C1
* IBM PC/XT 8086-9.54Mhz PCDOS 3.1 Lattice 2.15 980 980 C1
* Plexus P35 68000-10Mhz UNIX System III cc 984 980
* PDP-11/73 KDJ11-AA 15Mhz UNIX V7M 2.1 cc 862 981
* VAX 11/750 w/FPA UNIX 4.3bsd cc 994 997
* IRIS-1400 68010-10Mhz UNIX System V cc 909 1000
* IBM PC/AT 80286-6Mhz Venix/86 2.1 cc 961 1000
* IBM PC/AT 80286-6Mhz PCDOS 3.0 b16cc 2.0 943 1063
* Zilog S8000/11 Z8001-5.5Mhz Zeus 3.2 cc 1011 1084
* NSC ICM-3216 NSC 32016-10Mhz UNIX SVR2 cc 1041 1084
* IBM PC/AT 80286-6Mhz PCDOS 3.0 MS 3.0(small) 1063 1086
* VAX 11/750 w/FPA VMS VAX-11 C 2.0 958 1091
* Stride 68000-10Mhz System-V/68 cc 1041 1111
* Plexus P/60 MC68000-12.5Mhz UNIX SYSIII Plexus 1111 1111
* ATT PC7300 68010-10Mhz UNIX 5.0.2 cc 1041 1111
* CCC 3230 - Xelos R01(SVR2) cc 1040 1126
* Stride 68000-12Mhz System-V/68 cc 1063 1136
* IBM PC/AT 80286-6Mhz Venix/286 SVR2 cc 1056 1149
* Plexus P/60 MC68000-12.5Mhz UNIX SYSIII Plexus 1111 1163 T
* IBM PC/AT 80286-6Mhz PCDOS 3.0 Datalight 1.10 1190 1190
* ATT PC6300+ 80286-6Mhz MSDOS 3.1 b16cc 2.0 1111 1219
* IBM PC/AT 80286-6Mhz PCDOS 3.1 Wizard 2.1 1136 1219
* Sun2/120 68010-10Mhz Sun 4.2BSD cc 1136 1219
* IBM PC/AT 80286-6Mhz PCDOS 3.0 CI-C86 2.20M 1219 1219
* WICAT PB 68000-8Mhz System V WICAT C 4.1 998 1226 ~
* MASSCOMP 500 68010-10MHz RTU V3.0 cc (V3.2) 1156 1238
* Alliant FX/8 IP (68012-12Mhz) Concentrix cc -ip;exec -i 1170 1243 FX
* Cyb DataMate 68010-12.5Mhz Uniplus 5.0 Unisoft cc 1162 1250
* PDP 11/70 - UNIX 5.2 cc 1162 1250
* IBM PC/AT 80286-6Mhz PCDOS 3.1 Lattice 2.15 1250 1250
* IBM PC/AT 80286-7.5Mhz Venix/86 2.1 cc 1190 1315 *15
* Sun2/120 68010-10Mhz Standalone cc 1219 1315
* Intel 380 80286-8Mhz Xenix R3.0up1 cc 1250 1315 *16
* Sequent Balance 8000 NS32032-10MHz Dynix 2.0 cc 1250 1315 N12
* IBM PC/DSI-32 32032-10Mhz MSDOS 3.1 GreenHills 2.14 1282 1315 C3
* ATT 3B2/400 WE32100-?Mhz UNIX 5.2 cc 1315 1315
* CCC 3250XP - Xelos R01(SVR2) cc 1215 1318
* IBM PC/RT 032 RISC(801?)?Mhz BSD 4.2 cc 1248 1333 RT
* DG MV4000 - AOS/VS 5.00 cc 1333 1333
* IBM PC/AT 80286-8Mhz Venix/86 2.1 cc 1275 1380 *16
* IBM PC/AT 80286-6Mhz MSDOS 3.0 Microsoft 3.0 1250 1388
* ATT PC6300+ 80286-6Mhz MSDOS 3.1 CI-C86 2.20M 1428 1428
* COMPAQ/286 80286-8Mhz Venix/286 SVR2 cc 1326 1443
* IBM PC/AT 80286-7.5Mhz Venix/286 SVR2 cc 1333 1449 *15
* WICAT PB 68000-8Mhz System V WICAT C 4.1 1169 1464 S~
* Tandy II/6000 68000-8Mhz Xenix 3.0 cc 1384 1477
* MicroVAX II - Mach/4.3 cc 1513 1536
* WICAT MB 68000-12.5Mhz System V WICAT C 4.1 1246 1537 ~
* IBM PC/AT 80286-9Mhz SCO Xenix V cc 1540 1556 *18
* Cyb DataMate 68010-12.5Mhz Uniplus 5.0 Unisoft cc 1470 1562 S
* VAX 11/780 - UNIX 5.2 cc 1515 1562
* MicroVAX-II - - - 1562 1612
* VAX-780/MA780 Mach/4.3 cc 1587 1612
* VAX 11/780 - UNIX 4.3bsd cc 1646 1662
* Apollo DN660 - AegisSR9/IX cc 3.12 1666 1666
* ATT 3B20 - UNIX 5.2 cc 1515 1724
* NEC PC-98XA 80286-8Mhz PCDOS 3.1 Lattice 2.15 1724 1724 @
* HP9000-500 B series CPU HP-UX 4.02 cc 1724 -
* Ridge 32C V1 - ROS 3.3 Ridge C (older) 1776 -
* IBM PC/STD 80286-8Mhz MSDOS 3.0 Microsoft 3.0 1724 1785 C2
* WICAT MB 68000-12.5Mhz System V WICAT C 4.1 1450 1814 S~
* WICAT PB 68000-12.5Mhz System V WICAT C 4.1 1530 1898 ~
* DEC-2065 KL10-Model B TOPS-20 6.1FT5 Port. C Comp. 1937 1946
* Gould PN6005 - UTX 1.1(4.2BSD) cc 1675 1964
* DEC2060 KL-10 TOPS-20 cc 2000 2000 NM
* Intel 310AP 80286-8Mhz Xenix 3.0 cc 1893 2009
* VAX 11/785 - UNIX 5.2 cc 2083 2083
* VAX 11/785 - VMS VAX-11 C 2.0 2083 2083
* VAX 11/785 - UNIX SVR2 cc 2123 2083
* VAX 11/785 - ULTRIX-32 1.1 cc 2083 2091
* VAX 11/785 - UNIX 4.3bsd cc 2135 2136
* WICAT PB 68000-12.5Mhz System V WICAT C 4.1 1780 2233 S~
* Pyramid 90x - OSx 2.3 cc 2272 2272
* Pyramid 90x FPA,cache,4Mb OSx 2.5 cc no -O 2777 2777
* Pyramid 90x w/cache OSx 2.5 cc w/-O 3333 3333
* IBM-4341-II - VM/SP3 Waterloo C 1.2 3333 3333
* IRIS-2400T 68020-16.67Mhz UNIX System V cc 3105 3401
* Celerity C-1200 ? UNIX 4.2BSD cc 3485 3468
* SUN 3/75 68020-16.67Mhz SUN 4.2 V3 cc 3333 3571
* IBM-4341 Model 12 UTS 5.0 ? 3685 3685
* SUN-3/160 68020-16.67Mhz Sun 4.2 V3.0A cc 3381 3764
* Sun 3/180 68020-16.67Mhz Sun 4.2 cc 3333 3846
* IBM-4341 Model 12 UTS 5.0 ? 3910 3910 MN
* MC 5400 68020-16.67MHz RTU V3.0 cc (V4.0) 3952 4054
* Intel 386/20 80386-12.5Mhz PMON debugger Intel C386v0.2 4149 4386
* NCR Tower32 68020-16.67Mhz SYS 5.0 Rel 2.0 cc 3846 4545
* MC 5600/5700 68020-16.67MHz RTU V3.0 cc (V4.0) 4504 4746 %
* Intel 386/20 80386-12.5Mhz PMON debugger Intel C386v0.2 4534 4794 i1
* Intel 386/20 80386-16Mhz PMON debugger Intel C386v0.2 5304 5607
* Gould PN9080 custom ECL UTX-32 1.1C cc 5369 5676
* Gould 1460-342 ECL proc UTX/32 1.1/c cc 5342 5677 G1
* VAX-784 - Mach/4.3 cc 5882 5882 &4
* Intel 386/20 80386-16Mhz PMON debugger Intel C386v0.2 5801 6133 i1
* VAX 8600 - UNIX 4.3bsd cc 7024 7088
* VAX 8600 - VMS VAX-11 C 2.0 7142 7142
* Alliant FX/8 CE Concentrix cc -ce;exec -c 6952 7655 FX
* CCI POWER 6/32 COS(SV+4.2) cc 7500 7800
* CCI POWER 6/32 POWER 6 UNIX/V cc 8236 8498
* CCI POWER 6/32 4.2 Rel. 1.2b cc 8963 9544
* Sperry (CCI Power 6) 4.2BSD cc 9345 10000
* CRAY-X-MP/12 105Mhz COS 1.14 Cray C 10204 10204
* IBM-3083 - UTS 5.0 Rel 1 cc 16666 12500
* CRAY-1A 80Mhz CTSS Cray C 2.0 12100 13888
* IBM-3083 - VM/CMS HPO 3.4 Waterloo C 1.2 13889 13889
* Amdahl 470 V/8 UTS/V 5.2 cc v1.23 15560 15560
* CRAY-X-MP/48 105Mhz CTSS Cray C 2.0 15625 17857
* Amdahl 580 - UTS 5.0 Rel 1.2 cc v1.5 23076 23076
* Amdahl 5860 UTS/V 5.2 cc v1.23 28970 28970
*
* NOTE
* * Crystal changed from 'stock' to listed value.
* + This Macintosh was upgraded from 128K to 512K in such a way that
* the new 384K of memory is not slowed down by video generator accesses.
* % Single processor; MC == MASSCOMP
* NM A version 7 C compiler written at New Mexico Tech.
* @ vanilla Lattice compiler used with MicroPro standard library
* S Shorts used instead of ints
* T with Chris Torek's patches (whatever they are).
* ~ For WICAT Systems: MB=MultiBus, PB=Proprietary Bus
* LM Large Memory Model. (Otherwise, all 80x8x results are small model)
* MM Medium Memory Model. (Otherwise, all 80x8x results are small model)
* C1 Univation PC TURBO Co-processor; 9.54Mhz 8086, 640K RAM
* C2 Seattle Telecom STD-286 board
* C3 Definicon DSI-32 coprocessor
* C? Unknown co-processor board?
* CT1 Convergent Technologies MegaFrame, 1 processor.
* MN Using Mike Newtons 'optimizer' (see net.sources).
* G1 This Gould machine has 2 processors and was able to run 2 dhrystone
* Benchmarks in parallel with no slowdown.
* FH FHC == Frank Hogg Labs (Hazelwood Uniquad 2 in an FHL box).
* FX The Alliant FX/8 is a system consisting of 1-8 CEs (computation
* engines) and 1-12 IPs (interactive processors). Note N8 applies.
* RT This is one of the RT's that CMU has been using for awhile. I'm
* not sure that this is identical to the machine that IBM is selling
* to the public.
* i1 Normally, the 386/20 starter kit has a 16k direct mapped cache
* which inserts 2 or 3 wait states on a write thru. These results
* were obtained by disabling the write-thru, or essentially turning
* the cache into 0 wait state memory.
* Nnn This machine has multiple processors, allowing "nn" copies of the
* benchmark to run in the same time as 1 copy.
* &nn This machine has "nn" processors, and the benchmark results were
* obtained by having all "nn" processors working on 1 copy of dhrystone.
* (Note, this is different than Nnn. Salesmen like this measure).
* ? I don't trust results marked with '?'. These were sent to me with
* either incomplete info, or with times that just don't make sense.
* ?? means I think the performance is too poor, ?! means too good.
* If anybody can confirm these figures, please respond.
*
* ABBREVIATIONS
* CCC Concurrent Computer Corp. (was Perkin-Elmer)
* MC Masscomp
*
*--------------------------------RESULTS END----------------------------------
*
* The following program contains statements of a high-level programming
* language (C) in a distribution considered representative:
*
* assignments 53%
* control statements 32%
* procedure, function calls 15%
*
* 100 statements are dynamically executed. The program is balanced with
* respect to the three aspects:
* - statement type
* - operand type (for simple data types)
* - operand access
* operand global, local, parameter, or constant.
*
* The combination of these three aspects is balanced only approximately.
*
* The program does not compute anything meaningfull, but it is
* syntactically and semantically correct.
*
*/
/* Accuracy of timings and human fatigue controlled by next two lines */
/*#define LOOPS 5000 /* Use this for slow or 16 bit machines */
/*#define LOOPS 50000 /* Use this for slow or 16 bit machines */
/*#define LOOPS 500000 /* Use this for faster machines */
#define LOOPS 50000000 /* High value for i7 QuadCore MacBook Pro */
/* Compiler dependent options */
#undef NOENUM /* Define if compiler has no enum's */
#undef NOSTRUCTASSIGN /* Define if compiler can't assign structures */
/* define only one of the next three defines */
/*#define GETRUSAGE /* Use getrusage(2) time function */
/*#define TIMES /* Use times(2) time function */
#define TIME /* Use time(2) time function */
/* define the granularity of your times(2) function (when used) */
#define HZ 60 /* times(2) returns 1/60 second (most) */
/*#define HZ 100 /* times(2) returns 1/100 second (WECo) */
/* for compatibility with goofed up version */
/*#define GOOF /* Define if you want the goofed up version */
#ifdef GOOF
char Version[] = "1.0";
#else
char Version[] = "1.1";
#endif
#ifdef NOSTRUCTASSIGN
#define structassign(d, s) memcpy(&(d), &(s), sizeof(d))
#else
#define structassign(d, s) d = s
#endif
#ifdef NOENUM
#define Ident1 1
#define Ident2 2
#define Ident3 3
#define Ident4 4
#define Ident5 5
typedef int Enumeration;
#else
typedef enum {Ident1, Ident2, Ident3, Ident4, Ident5} Enumeration;
#endif
typedef int OneToThirty;
typedef int OneToFifty;
typedef char CapitalLetter;
typedef char String30[31];
typedef int Array1Dim[51];
typedef int Array2Dim[51][51];
struct Record
{
struct Record *PtrComp;
Enumeration Discr;
Enumeration EnumComp;
OneToFifty IntComp;
String30 StringComp;
};
typedef struct Record RecordType;
typedef RecordType * RecordPtr;
typedef int boolean;
#define NULL 0
#define TRUE 1
#define FALSE 0
#ifndef REG
#define REG
#endif
#ifdef TIMES
#include
#include
#include
#endif
#ifdef GETRUSAGE
#include
#include
#endif
#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
#include <string.h>
/* Function Prototype */
int Proc0(void);
int Proc1(REG RecordPtr PtrParIn);
int Proc2(OneToFifty *IntParIO);
int Proc3(REG RecordPtr *PtrParOut);
int Proc4(void);
int Proc5(void);
int Proc6(REG Enumeration EnumParIn, REG Enumeration *EnumParOut);
int Proc7(OneToFifty IntParI1, OneToFifty IntParI2, OneToFifty *IntParOut);
int Proc8(Array1Dim Array1Par, Array2Dim Array2Par, OneToFifty IntParI1, OneToFifty IntParI2);
/*
* Package 1
*/
int IntGlob;
boolean BoolGlob;
char Char1Glob;
char Char2Glob;
Array1Dim Array1Glob;
Array2Dim Array2Glob;
RecordPtr PtrGlb;
RecordPtr PtrGlbNext;
Enumeration Func1(CharPar1, CharPar2)
CapitalLetter CharPar1;
CapitalLetter CharPar2;
{
REG CapitalLetter CharLoc1;
REG CapitalLetter CharLoc2;
CharLoc1 = CharPar1;
CharLoc2 = CharLoc1;
if (CharLoc2 != CharPar2)
return (Ident1);
else
return (Ident2);
}
boolean Func2(StrParI1, StrParI2)
String30 StrParI1;
String30 StrParI2;
{
REG OneToThirty IntLoc;
REG CapitalLetter CharLoc;
IntLoc = 1;
while (IntLoc <= 1)
if (Func1(StrParI1[IntLoc], StrParI2[IntLoc+1]) == Ident1)
{
CharLoc = 'A';
++IntLoc;
}
if (CharLoc >= 'W' && CharLoc <= 'Z')
IntLoc = 7;
if (CharLoc == 'X')
return(TRUE);
else
{
if (strcmp(StrParI1, StrParI2) > 0)
{
IntLoc += 7;
return (TRUE);
}
else
return (FALSE);
}
}
boolean Func3(EnumParIn)
REG Enumeration EnumParIn;
{
REG Enumeration EnumLoc;
EnumLoc = EnumParIn;
if (EnumLoc == Ident3) return (TRUE);
return (FALSE);
}
extern Enumeration Func1();
extern boolean Func2();
extern boolean Func3();
#ifdef NOSTRUCTASSIGN
memcpy(d, s, l)
register char *d;
register char *s;
register int l;
{
while (l--) *d++ = *s++;
}
#endif
/* ---------- */
int Proc2(IntParIO)
OneToFifty *IntParIO;
{
REG OneToFifty IntLoc;
REG Enumeration EnumLoc;
IntLoc = *IntParIO + 10;
for(;;)
{
if (Char1Glob == 'A')
{
--IntLoc;
*IntParIO = IntLoc - IntGlob;
EnumLoc = Ident1;
}
if (EnumLoc == Ident1)
break;
}
}
int Proc7(IntParI1, IntParI2, IntParOut)
OneToFifty IntParI1;
OneToFifty IntParI2;
OneToFifty *IntParOut;
{
REG OneToFifty IntLoc;
IntLoc = IntParI1 + 2;
*IntParOut = IntParI2 + IntLoc;
}
int Proc3(REG RecordPtr *PtrParOut)
{
if (PtrGlb != NULL)
*PtrParOut = PtrGlb->PtrComp;
else
IntGlob = 100;
Proc7(10, IntGlob, &PtrGlb->IntComp);
}
int Proc4()
{
REG boolean BoolLoc;
BoolLoc = Char1Glob == 'A';
BoolLoc |= BoolGlob;
Char2Glob = 'B';
}
int Proc5()
{
Char1Glob = 'A';
BoolGlob = FALSE;
}
int Proc6(EnumParIn, EnumParOut)
REG Enumeration EnumParIn;
REG Enumeration *EnumParOut;
{
*EnumParOut = EnumParIn;
if (! Func3(EnumParIn) )
*EnumParOut = Ident4;
switch (EnumParIn)
{
case Ident1: *EnumParOut = Ident1; break;
case Ident2: if (IntGlob > 100) *EnumParOut = Ident1;
else *EnumParOut = Ident4;
break;
case Ident3: *EnumParOut = Ident2; break;
case Ident4: break;
case Ident5: *EnumParOut = Ident3;
}
}
int Proc8(Array1Par, Array2Par, IntParI1, IntParI2)
Array1Dim Array1Par;
Array2Dim Array2Par;
OneToFifty IntParI1;
OneToFifty IntParI2;
{
REG OneToFifty IntLoc;
REG OneToFifty IntIndex;
IntLoc = IntParI1 + 5;
Array1Par[IntLoc] = IntParI2;
Array1Par[IntLoc+1] = Array1Par[IntLoc];
Array1Par[IntLoc+30] = IntLoc;
for (IntIndex = IntLoc; IntIndex <= (IntLoc+1); ++IntIndex)
Array2Par[IntLoc][IntIndex] = IntLoc;
++Array2Par[IntLoc][IntLoc-1];
Array2Par[IntLoc+20][IntLoc] = Array1Par[IntLoc];
IntGlob = 5;
}
int Proc1(PtrParIn)
REG RecordPtr PtrParIn;
{
#define NextRecord (*(PtrParIn->PtrComp))
structassign(NextRecord, *PtrGlb);
PtrParIn->IntComp = 5;
NextRecord.IntComp = PtrParIn->IntComp;
NextRecord.PtrComp = PtrParIn->PtrComp;
Proc3((RecordPtr *)NextRecord.PtrComp);
if (NextRecord.Discr == Ident1)
{
NextRecord.IntComp = 6;
Proc6(PtrParIn->EnumComp, &NextRecord.EnumComp);
NextRecord.PtrComp = PtrGlb->PtrComp;
Proc7(NextRecord.IntComp, 10, &NextRecord.IntComp);
}
else
structassign(*PtrParIn, NextRecord);
#undef NextRecord
}
int Proc0(void)
{
OneToFifty IntLoc1;
REG OneToFifty IntLoc2;
OneToFifty IntLoc3;
REG char CharLoc;
REG char CharIndex;
Enumeration EnumLoc;
String30 String1Loc;
String30 String2Loc;
extern void *malloc();
register unsigned int i;
#ifdef TIME
long time();
long starttime;
long benchtime;
long nulltime;
starttime = time( (long *) 0);
for (i = 0; i < LOOPS; ++i);
nulltime = time( (long *) 0) - starttime; /* Computes o'head of loop */
#endif
#ifdef TIMES
time_t starttime;
time_t benchtime;
time_t nulltime;
struct tms tms;
times(&tms); starttime = tms.tms_utime;
for (i = 0; i < LOOPS; ++i);
times(&tms);
nulltime = tms.tms_utime - starttime; /* Computes overhead of looping */
#endif
#ifdef GETRUSAGE
struct rusage starttime;
struct rusage endtime;
struct timeval nulltime;
getrusage(RUSAGE_SELF, &starttime);
for (i = 0; i < LOOPS; ++i);
getrusage(RUSAGE_SELF, &endtime);
nulltime.tv_sec = endtime.ru_utime.tv_sec - starttime.ru_utime.tv_sec;
nulltime.tv_usec = endtime.ru_utime.tv_usec - starttime.ru_utime.tv_usec;
#endif
PtrGlbNext = (RecordPtr) malloc(sizeof(RecordType));
PtrGlb = (RecordPtr) malloc(sizeof(RecordType));
PtrGlb->PtrComp = PtrGlbNext;
PtrGlb->Discr = Ident1;
PtrGlb->EnumComp = Ident3;
PtrGlb->IntComp = 40;
strcpy(PtrGlb->StringComp, "DHRYSTONE PROGRAM, SOME STRING");
#ifndef GOOF
strcpy(String1Loc, "DHRYSTONE PROGRAM, 1'ST STRING"); /*GOOF*/
#endif
Array2Glob[8][7] = 10; /* Was missing in published program */
/*****************
-- Start Timer --
*****************/
#ifdef TIME
starttime = time( (long *) 0);
#endif
#ifdef TIMES
times(&tms); starttime = tms.tms_utime;
#endif
#ifdef GETRUSAGE
getrusage (RUSAGE_SELF, &starttime);
#endif
for (i = 0; i < LOOPS; ++i)
{
Proc5();
Proc4();
IntLoc1 = 2;
IntLoc2 = 3;
strcpy(String2Loc, "DHRYSTONE PROGRAM, 2'ND STRING");
EnumLoc = Ident2;
BoolGlob = ! Func2(String1Loc, String2Loc);
while (IntLoc1 < IntLoc2)
{
IntLoc3 = 5 * IntLoc1 - IntLoc2;
Proc7(IntLoc1, IntLoc2, &IntLoc3);
++IntLoc1;
}
Proc8(Array1Glob, Array2Glob, IntLoc1, IntLoc3);
Proc1(PtrGlb);
for (CharIndex = 'A'; CharIndex <= Char2Glob; ++CharIndex)
if (EnumLoc == Func1(CharIndex, 'C'))
Proc6(Ident1, &EnumLoc);
IntLoc3 = IntLoc2 * IntLoc1;
IntLoc2 = IntLoc3 / IntLoc1;
IntLoc2 = 7 * (IntLoc3 - IntLoc2) - IntLoc1;
Proc2(&IntLoc1);
}
/*****************
-- Stop Timer --
*****************/
#ifdef TIME
benchtime = time( (long *) 0) - starttime - nulltime;
printf("Dhrystone(%s) time for %ld passes = %ld\n",
Version,
(long) LOOPS, benchtime);
if(benchtime != 0)
{
printf("This machine benchmarks at %ld dhrystones/second\n",
((long) LOOPS) / benchtime);
}
else
{
printf("This machine is too fast! Increase LOOPS value.\n");
}
#endif
#ifdef TIMES
times(&tms);
benchtime = tms.tms_utime - starttime - nulltime;
printf("Dhrystone(%s) time for %ld passes = %ld\n",
Version,
(long) LOOPS, benchtime/HZ);
printf("This machine benchmarks at %ld dhrystones/second\n",
((long) LOOPS) * HZ / benchtime);
#endif
#ifdef GETRUSAGE
getrusage(RUSAGE_SELF, &endtime);
{
double t = (double)(endtime.ru_utime.tv_sec
- starttime.ru_utime.tv_sec
- nulltime.tv_sec)
+ (double)(endtime.ru_utime.tv_usec
- starttime.ru_utime.tv_usec
- nulltime.tv_usec) * 1e-6;
printf("Dhrystone(%s) time for %ld passes = %.1f\n",
Version,
(long)LOOPS,
t);
printf("This machine benchmarks at %.0f dhrystones/second\n",
(double)LOOPS / t);
}
#endif
}
/* main function */
int main()
{
Proc0();
exit(0);
}
とりあえず、必要な関数を呼び出せるよう #include を追加。
動的にメモリ確保してると malloc.h が必要なんだな。
indlude
#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
#include <string.h>
関数プロトタイプ宣言を追加。
function protopype
/* Function Prototype */
int Proc0(void);
int Proc1(REG RecordPtr PtrParIn);
int Proc2(OneToFifty *IntParIO);
int Proc3(REG RecordPtr *PtrParOut);
int Proc4(void);
int Proc5(void);
int Proc6(REG Enumeration EnumParIn, REG Enumeration *EnumParOut);
int Proc7(OneToFifty IntParI1, OneToFifty IntParI2, OneToFifty *IntParOut);
int Proc8(Array1Dim Array1Par, Array2Dim Array2Par, OneToFifty IntParI1, OneToFifty IntParI2);
main()関数を最後に配置して、関数が後方参照されないように入れ替え。どれだけ意味があるかはちょっと分からないけど。
ベンチマーク関数は、Proc0(),Proc1(),Proc2(),Proc3(),Proc4(),Proc5(),Proc6(),Proc7(),Proc8() まで8つある。
他を呼び出していない単独関数はProc2(),Proc4(),Proc5(),Proc6(),Proc7(),Proc8()の6つ。
Proc1()は＝＞Proc3(),Proc6(),Proc7()を呼び出し、
Proc3()は＝＞Proc7()を呼び出しており、
Proc0は＝＞Proc5(),Proc4(),Proc7(),Proc8(),Proc1(),Proc6(),Proc2()を呼び出している。
最終的にmain()は実質的にmain()相当の機能がある司令塔になる関数、Proc0()を呼び出すので最後の最後に配置される。
確か、呼び出し元を後に持ってくることで、コンパイラが使う関数のポイントを把握しやすくなるはずなんだけど、TurboCみたいな1passのコンパイラでなければ普通に2pass目以降でこの辺りは整理されたはず。
Proc1()
Proc1(PtrParIn)
REG RecordPtr PtrParIn;
{
#define NextRecord (*(PtrParIn->PtrComp))
structassign(NextRecord, *PtrGlb);
PtrParIn->IntComp = 5;
NextRecord.IntComp = PtrParIn->IntComp;
NextRecord.PtrComp = PtrParIn->PtrComp;
- Proc3(NextRecord.PtrComp);
+ Proc3((RecordPtr *)NextRecord.PtrComp);
if (NextRecord.Discr == Ident1)
{
NextRecord.IntComp = 6;
Proc6(PtrParIn->EnumComp, &NextRecord.EnumComp);
NextRecord.PtrComp = PtrGlb->PtrComp;
Proc7(NextRecord.IntComp, 10, &NextRecord.IntComp);
}
else
structassign(*PtrParIn, NextRecord);
#undef NextRecord
}
Proc3()の呼び出しでWarningが出るので、キャストして止めた。
これで正しいのか、イマイチ自信がないが、警告は出なくなった。
test run
benchmania@testmachine:~$ gcc -O -DREG=register -o dhrystone1
benchmania@testmachine:~$ /dhrystone1
Dhrystone(1.1) time for 50000000 passes = 3
This machine benchmarks at 16666666 dhrystones/second
benchmania@testmachine:~$ gcc -O -o dhrystone1 ./dhrystone1.c
benchmania@testmachine:~$ /dhrystone1
Dhrystone(1.1) time for 50000000 passes = 2
This machine benchmarks at 25000000 dhrystones/second
もはやループ実行の速度が速すぎて、レジスタ割付けの意味があるんだか無いんだかよく分からない結果に。そもそも秒単位の精度しかないtime()で計測するのは無理があるような気がしないでもない。
ソースコードにはtime()を使う計測以外に、times()を使う方法と、getrusage()を使う方法での計測コードが実装されている。
一番高精度なのはリソース使用量を見るgetrusage()らしい。
getrusage()
/* define only one of the next three defines */
- /*#define GETRUSAGE /* Use getrusage(2) time
+ #define GETRUSAGE /* Use getrusage(2) time function */
/*#define TIMES /* Use times(2) time function */
/*#define TIME /* Use time(2) time function */
元のソースでは時間計測に必要な該当部分の #include が空欄だったので、適切なヘッダファイルを読めるように修正。
include
#ifdef TIMES
#include <sys/times.h>
// #include
// #include
#endif
#ifdef GETRUSAGE
#include <time.h>
#include <sys/resource.h>
#endif
さらにループを10倍に増やしてみた。
LOOP COUNT
/* Accuracy of timings and human fatigue controlled by next two lines */
/*#define LOOPS 5000 /* Use this for slow or 16 bit machines */
/*#define LOOPS 50000 /* Use this for slow or 16 bit machines */
/*#define LOOPS 500000 /* Use this for faster machines */
- #define LOOPS 50000000 /* High value for i7 QuadCore MacBook Pro */
+ /*#define LOOPS 50000000 /* High value for i7 QuadCore MacBook Pro */
+ #define LOOPS 500000000 /* High value for Intel Core2 1.8GHz */
修正が終わったら、もう一度ベンチを回してみる。
test run-2
benchmania@testmachine:~$ gcc -O -o dhrystone1 ./dhrystone1.c
benchmania@testmachine:~$ ./dhrystone1
Dhrystone(1.1) time for 500000000 passes = 29.6
This machine benchmarks at 16875815 dhrystones/second
benchmania@testmachine:~$ ./dhrystone1
Dhrystone(1.1) time for 500000000 passes = 27.8
This machine benchmarks at 17979742 dhrystones/second
benchmania@testmachine:~$ ./dhrystone1
Dhrystone(1.1) time for 500000000 passes = 101.5
This machine benchmarks at 4923727 dhrystones/second
benchmania@testmachine:~$ ./dhrystone1
Dhrystone(1.1) time for 500000000 passes = 27.7
This machine benchmarks at 18027599 dhrystones/second
benchmania@testmachine:~$ gcc -O -DREG=register -o dhrystone1 ./dhrystone1.c
benchmania@testmachine:~$ ./dhrystone1
Dhrystone(1.1) time for 500000000 passes = 28.0
This machine benchmarks at 17845225 dhrystones/second
benchmania@testmachine:~$ ./dhrystone1
Dhrystone(1.1) time for 500000000 passes = 29.9
This machine benchmarks at 16739388 dhrystones/second
benchmania@testmachine:~$ ./dhrystone1
Dhrystone(1.1) time for 500000000 passes = 29.1
This machine benchmarks at 17189801 dhrystones/second
benchmania@testmachine:~$
速くなったような、ならないような。タマに物凄く遅い値が出るのは何なんだろう。
最適化オプションを変えて試すと結構大きく変化があった。
test run-3 (Ryzen 5 3600X 3.8GHz)
benchmania@testmachine:~$ gcc -O -o dhrystone1 ./dhrystone1.c
benchmania@testmachine:~$ ./dhrystone1
Dhrystone(1.1) time for 500000000 passes = 10.8
This machine benchmarks at 46376812 dhrystones/second
benchmania@testmachine:~$ gcc ./dhrystone1.c -Wall -Wextra -O2 -march=native -std=gnu11 -o dhrystone1
benchmania@testmachine:~$ ./dhrystone1
Dhrystone(1.1) time for 500000000 passes = 9.6
This machine benchmarks at 51948052 dhrystones/second
benchmania@testmachine:~$ gcc -O -DREG=register -o dhrystone1r ./dhrystone1.c
benchmania@testmachine:~$ ./dhrystone1r
Dhrystone(1.1) time for 500000000 passes = 10.6
This machine benchmarks at 47128130 dhrystones/second
benchmania@testmachine:~$ gcc ./dhrystone1.c -DREG=register -Wall -Wextra -O2 -march=native -std=gnu11 -o dhrystone1r
benchmania@testmachine:~$ ./dhrystone1r
Dhrystone(1.1) time for 500000000 passes = 9.7
This machine benchmarks at 51364366 dhrystones/second
benchmania@testmachine:~$
Raspberry Pi でも回してみる。
-O3 最適化はバキバキに効くみたいだけど、その後思い付きで試してみた、 NEON命令はどこいった？ に書いてあった ARM NEON (asimd)命令を使ったベクトル命令での最適化オプションは効果が見られなかった。ただし、-O2 辺りからベクトル命令を積極的に使っているという話もあるので、既に使っていて改めて指定するまでもないのかもしれない。暇があればアセンブラソースを確認してみたい。
test run-4 (Raspberry Pi400 )
benchmania@testmachine:~/src/dhrystone$ ./dhrystone
Dhrystone(1.1) time for 500000000 passes = 124.8
This machine benchmarks at 4006062 dhrystones/second
benchmania@testmachine:~/src/dhrystone$
benchmania@testmachine:~/src/dhrystone $ make
gcc -O3 -Wall -I/usr/local/include -o dhrystone dhrystone1.c
benchmania@testmachine:~/src/dhrystone $ ./dhrystone
Dhrystone(1.1) time for 500000000 passes = 22.2
This machine benchmarks at 22498243 dhrystones/second
benchmania@testmachine:~/src/dhrystone $ make clean
rm -f *.o *~ dhrystone
benchmania@testmachine:~/src/dhrystone $ make
gcc -O3 -Wall -march=armv8-a+simd -I/usr/local/include -o dhrystone dhrystone1.c
benchmania@testmachine:~/src/dhrystone $ ./dhrystone
Dhrystone(1.1) time for 500000000 passes = 22.2
This machine benchmarks at 22526614 dhrystones/second
benchmania@testmachine:~/src/dhrystone $
test run-5 (Raspberry Pi4 8G)
benchmania@testmachine:~/src/dhrystone $ gcc ./dhrystone1.c -o ./dhrystone1a
benchmania@testmachine:~/src/dhrystone $ ls
dhrystone1.c dhrystone1.c~ dhrystone1.s dhrystone1a dry.c
benchmania@testmachine:~/src/dhrystone $ gcc ./dhrystone1.c -O3 -Wall -march=armv8-a+simd -o ./dhrystone1b
benchmania@testmachine:~/src/dhrystone $ ls
dhrystone1.c dhrystone1.c~ dhrystone1.s dhrystone1a dhrystone1b dry.c
benchmania@testmachine:~/src/dhrystone $ ./dhrystone1a
Dhrystone(1.1) time for 500000000 passes = 124.9
This machine benchmarks at 4004525 dhrystones/second
benchmania@testmachine:~/src/dhrystone $ ./dhrystone1b
Dhrystone(1.1) time for 500000000 passes = 22.0
This machine benchmarks at 22687387 dhrystones/second
benchmania@testmachine:~/src/dhrystone $
test run-6 (First Raspberry Pi 256M)
benchmania@testmachine:~/src/dhrystone $ gcc -O2 -Wall -I/usr/local/include dhrystone1.c -o dhrystone1
benchmania@testmachine:~/src/dhrystone $ ./dhrystone1
Dhrystone(1.1) time for 500000000 passes = 243.4
This machine benchmarks at 2054281 dhrystones/second
benchmania@testmachine:~/src/dhrystone $
test run-7 (Core2 T5600 1.83GHz)
benchmania@testmachine:~/src/dhrystone $ gcc -O3 -march=core2 dhrystone1.c -o dhrystone1
benchmania@testmachine:~/src/dhrystone $ ./dhrystone1
Dhrystone(1.1) time for 500000000 passes = 18.9
This machine benchmarks at 26476746 dhrystones/second
benchmania@testmachine:~/src/dhrystone $