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strdup compared with strlen+malloc+memcpy
Linux
AMD Opteron 285 at 2.6GHz with 1MB L2 cache, gcc3.2.3 (RHEL3 glibc-2.3.2-95.39), -O2
The logfile of the test can be found here.
GNUPlot rc-file: strdup-test.opteron.rc
Remarkable: at a blocksize of 69 bytes, the processingtime suddenly jumps up:
| Blocksize | wrapper | strdup |
| 67 | 13.890000 | 11.720000 |
| 68 | 13.010000 | 11.190000 |
| 69 | 18.920000 | 16.460000 |
| 70 | 19.730000 | 18.040000 |
| 71 | 18.920000 | 16.640000 |
| 72 | 17.750000 | 15.350000 |
Intel P4 at 3.2GHz with 0.5MB L2 Cache (Northwood), gcc3.3.3 Slackware glibc 2.3.3, -O2 -march=pentium4 -fprefetch-loop-arrays
The logfile of the test can be found here.
GNUPlot rc-file: strdup-test.northwood.rc
Remarkable: the first blocks of size 4 or less take less time to copy:
| Blocksize | wrapper | strdup |
| 2 | 10.970000 | 8.460000 |
| 3 | 11.190000 | 8.330000 |
| 4 | 14.940000 | 12.050000 |
| 5 | 14.940000 | 12.090000 |
| Blocksize | wrapper | strdup |
| 67 | 25.590000 | 17.260000 |
| 68 | 25.330000 | 17.070000 |
| 69 | 32.340000 | 24.150000 |
| 70 | 33.900000 | 23.820000 |
| Blocksize | wrapper | strdup |
| 254 | 55.470000 | 29.150000 |
| 255 | 56.280000 | 28.580000 |
| 256 | 62.280000 | 37.820000 |
| 257 | 64.280000 | 34.590000 |
Intel Xeon 2.83GHz 1MB L2 cache gcc 3.2.3 RHEL3-AS (glibc-2.3.2-95.39), -O2
The logfile of the test can be found here.
GNUPlot rc-file: strdup-test.xeon.rc
Notice the peaks every 32 bytes.
Intel P3 (Coppermine) 800MHz 256KB L2 Cache, -O2 -march=i486 Debian libc6-i686 2.3.6-15
The logfile of the test can be found here.
GNUPlot rc-file: strdup-test.coppermine.rc
AMD Sempron, 1.8GHz, 64KB L2, GCC 4.0.3, GLIBC 2.3.6, Ubuntu
The logfile of the test can be found here.
GNUPlot rc-file: strdup-test.sempron.rc
AMD Duron 1.3GHz, 64KB L2, GLIBC 2.3.5, GCC4.0.6, Slackware 10.2, -O2 -march=athlon-4
The logfile of the test can be found here.
GNUPlot rc-file: strdup-test.duron.rc
P2 Klamath, 233MHz, 512KB L2, -O2, GCC4.0.3, glibc2.3.6-15, Debian
The logfile of the test can be found here.
GNUPlot rc-file: strdup-test.klamath.rc
VIA Nehemiah, 1GHz, 64KB L2, GCC4.0.3, libc6-i686 2.3.6-18 Debian, -O2
The logfile of the test can be found here.
GNUPlot rc-file: strdup-test.nehemiah.rc
Other platforms
I added these graphs to see how other libcs behave.UltraSPARC-IIi 440MHz 2MB L2 Cache sunwspro -O2 (on Solaris 10)
The logfile of the test can be found here.
GNUPlot rc-file: strdup-test.ultrasparc.rc
MIPS running IRIX64 6.5
The logfile of the test can be found here.
GNUPlot rc-file: strdup-test.mips.rc
Celeron 600MHz, Windows XP Professional, Visual Studio 6.0
The logfile of the test can be found here.
GNUPlot rc-file: strdup-test.xppro.rc
Windows XP has no 'getrusage' forcing me to use 'time()', causing the blocky graph.
Celeron III, 800MHz, 256KB L2, GCC3.3, NetBSD 2.1
The logfile of the test can be found here.
GNUPlot rc-file: strdup-test.netbsd.rc
AMD Athlong 1GHz, FreeBSD 5.5 GCC3.4.2-20040728, -O2
The logfile of the test can be found here.
GNUPlot rc-file: strdup-test.freebsd5.5.rc
Celeron 2.4GHz, FreeBSD 6.1 GCC3.4.4-20050518, -O2
The logfile of the test can be found here.
GNUPlot rc-file: strdup-test.freebsd6.1.rc
VAXstation4000/60, 55MHz, 256KB L2, OpenVMS7.2, CCC6.4-005, /OPTIMIZE
The logfile of the test can be found here.
GNUPlot rc-file: strdup-test.vaxopenvms.rc
IBM 7028-6E4, 4CPU @ 1002MHz, AIX5.3 Power4
The logfile of the test can be found here.
GNUPlot rc-file: strdup-test.aix.rc
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