Messages in this thread | | | Date | Thu, 06 Feb 2003 12:38:11 -0800 | From | "Martin J. Bligh" <> | Subject | Re: gcc -O2 vs gcc -Os performance |
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>> All done with gcc-2.95.4 (Debian Woody). These machines (16x NUMA-Q) have >> 700MHz P3 Xeons with 2Mb L2 cache ... -Os might fare better on celeron >> with a puny cache if someone wants to try that out > > gcc 3.2 is a lot smarter about -Os and it makes a very big size > difference according to the numbers the from the ACPI guys. > > Im not sure testing with a gcc from the last millenium is useful 8)
Still no use. /me throws gcc-3.2 in the trash can.
2901299 vmlinux.O2 2667827 vmlinux.Os
Kernbench-2: (make -j N vmlinux, where N = 2 x num_cpus) Elapsed User System CPU 2.5.59-mjb3-gcc32-O2 45.86 564.75 110.91 1472.67 2.5.59-mjb3-gcc32-Os 45.74 563.96 111.06 1475.17
Kernbench-16: (make -j N vmlinux, where N = 16 x num_cpus) Elapsed User System CPU 2.5.59-mjb3-gcc32-O2 46.83 569.15 133.88 1500.50 2.5.59-mjb3-gcc32-Os 46.90 568.17 134.58 1497.83
DISCLAIMER: SPEC(tm) and the benchmark name SDET(tm) are registered trademarks of the Standard Performance Evaluation Corporation. This benchmarking was performed for research purposes only, and the run results are non-compliant and not-comparable with any published results.
Results are shown as percentages of the first set displayed
SDET 1 (see disclaimer) Throughput Std. Dev 2.5.59-mjb3-gcc32-O2 100.0% 3.4% 2.5.59-mjb3-gcc32-Os 99.8% 2.8%
SDET 2 (see disclaimer) Throughput Std. Dev 2.5.59-mjb3-gcc32-O2 100.0% 6.7% 2.5.59-mjb3-gcc32-Os 101.2% 4.9%
SDET 4 (see disclaimer) Throughput Std. Dev 2.5.59-mjb3-gcc32-O2 100.0% 3.8% 2.5.59-mjb3-gcc32-Os 95.1% 3.0%
SDET 8 (see disclaimer) Throughput Std. Dev 2.5.59-mjb3-gcc32-O2 100.0% 1.1% 2.5.59-mjb3-gcc32-Os 98.1% 1.4%
SDET 16 (see disclaimer) Throughput Std. Dev 2.5.59-mjb3-gcc32-O2 100.0% 1.6% 2.5.59-mjb3-gcc32-Os 97.7% 1.7%
SDET 32 (see disclaimer) Throughput Std. Dev 2.5.59-mjb3-gcc32-O2 100.0% 1.1% 2.5.59-mjb3-gcc32-Os 103.7% 1.9%
SDET 64 (see disclaimer) Throughput Std. Dev 2.5.59-mjb3-gcc32-O2 100.0% 1.4% 2.5.59-mjb3-gcc32-Os 96.6% 9.7%
NUMA schedbench 4: AvgUser Elapsed TotalUser TotalSys 2.5.59-mjb3-gcc32-O2 0.00 36.93 88.84 0.62 2.5.59-mjb3-gcc32-Os 0.00 44.28 96.95 0.67
NUMA schedbench 8: AvgUser Elapsed TotalUser TotalSys 2.5.59-mjb3-gcc32-O2 0.00 54.16 327.57 1.58 2.5.59-mjb3-gcc32-Os 0.00 50.66 248.42 1.89
NUMA schedbench 16: AvgUser Elapsed TotalUser TotalSys 2.5.59-mjb3-gcc32-O2 0.00 57.17 851.44 3.09 2.5.59-mjb3-gcc32-Os 0.00 57.25 849.20 3.14
NUMA schedbench 32: AvgUser Elapsed TotalUser TotalSys 2.5.59-mjb3-gcc32-O2 0.00 117.82 1808.42 6.34 2.5.59-mjb3-gcc32-Os 0.00 130.02 1814.74 6.52
NUMA schedbench 64: AvgUser Elapsed TotalUser TotalSys 2.5.59-mjb3-gcc32-O2 0.00 236.82 3616.04 15.17 2.5.59-mjb3-gcc32-Os 0.00 241.34 3624.50 16.39
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