Dhrystone results

This page stores various results obtained from running the Dhrystone benchmark included in this package. Bold text indicates the best result from a given compiler.

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Workstations

HP VISUALIZE C3000 (9000/785/C3000)

A mid-range Unix workstation released in 1999, based on HP's indigenous PA-8500 microprocessor with 1 MiB of on-die data cache, 512 KiB of on-die instruction cache and a clock frequency of 400 MHz. All tests are performed under HP-UX 11.11 (11i v1) on a system not specifically configured for benchmarking.

The differences in performance between Dhrystone run with and without register variables is minimal, likely due to the PA-8500's large number of general-purpose registers (32 general-purpose and 32 floating-point) and fast, spacious on-die caches.

HP C B.11.11.16: 50,000,000 loops, without register variables

Options	Dhrystones/second	VAX MIPS
none	442,477.9	251.8
+O1	666,666.7	379.4
+O2	1,000,000	569.2
+O3	1,282,051.3	729.7
+O4	1,851,851.9	1,054
-fast	1,470,588.2	837

HP C B.11.11.16: 50,000,000 loops, with register variables

Options	Dhrystones/second	VAX MIPS
none	495,049.5	281.8
+O1	657,894.7	374.4
+O2	1,000,000	569.2
+O3	1,282,051.3	729.7
+O4	1,785,714.3	1,016.3
-fast	1,470,588.2	837

Note: HP C +O2 is roughly equivalent to GCC -O1

GCC 4.2.3: 50,000,000 loops, without register variables

Options	Dhrystones/second	VAX MIPS
none	431,034.5	245.3
-O1	806,451.6	459
-O2	833,333.3	474.3
-O3	1,136,363.6	646.8
-O3 -ffast-math	1,136,363.6	646.8

GCC 4.2.3: 50,000,000 loops, with register variables

Options	Dhrystones/second	VAX MIPS
none	438,596.5	249.6
-O1	781,250.0	444.6
-O2	806,451.6	459
-O3	1,162,790.7	661.8
-O3 -ffast-math	1,162,790.7	661.8

Note: -Ofast is only available in GCC >=4.7