Date: Wed, 20 Jun 2007 10:24:01 -0400 (EDT) From: David Cross <dcross@okcupid.com> To: freebsd-hackers@freebsd.org Subject: Very slow sed... Message-ID: <20070620100737.S56928@max.okcupid.com>
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Ok the subject line is misleading.. but I don't know how else to put it. I have a machine on which SOME programs are slow. VERY SLOW. Other programs run just fine. I cannot seem to find the source of the problem. Machine 1 (the ok machine) is running 6.2-RELEASE-pLATEST. It is a CPU: Intel(R) Core(TM)2 CPU 6300 @ 1.86GHz (1862.11-MHz K8-class CPU) Origin = "GenuineIntel" Id = 0x6f6 Stepping = 6 Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,C MOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE> Features2=0xe3bd<SSE3,RSVD2,MON,DS_CPL,VMX,EST,TM2,<b9>,CX16,<b14>,<b15>> AMD Features=0x20100800<SYSCALL,NX,LM> AMD Features2=0x1<LAHF> Cores per package: 2 real memory = 2145427456 (2046 MB) avail memory = 2060214272 (1964 MB) FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs cpu0 (BSP): APIC ID: 0 cpu1 (AP): APIC ID: 1 Machine 2 (the slow machine) is running 6.2-RELEASE-pLATEST. It is a CPU: Intel(R) Core(TM)2 CPU 6320 @ 1.86GHz (1876.00-MHz K8-class CPU) Origin = "GenuineIntel" Id = 0x6f6 Stepping = 6 Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,C MOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE> Features2=0xe3bd<SSE3,RSVD2,MON,DS_CPL,VMX,EST,TM2,<b9>,CX16,XTPR,<b15>> AMD Features=0x20100800<SYSCALL,NX,LM> AMD Features2=0x1<LAHF> Cores per package: 2 real memory = 4764729344 (4544 MB) avail memory = 4063408128 (3875 MB) ACPI APIC Table: <INTEL DP965LT > FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs cpu0 (BSP): APIC ID: 0 cpu1 (AP): APIC ID: 1 Both are compiled with the exact same CFLAGS/COPTFLAGS (though it doesn't matter WHAT I compile it with, its still SLOW on many operations, thou fine on others). For example: Machine 1: dd bs=22 if=X11-lib32.tar.bz2 | cat >/dev/null 2571071+1 records in 2571071+1 records out 56563575 bytes transferred in 23.048543 secs (2454106 bytes/sec) Machine 2: dd bs=22 if=X11-lib32.tar.bz2 | cat >/dev/null 2571071+1 records in 2571071+1 records out 56563575 bytes transferred in 24.052331 secs (2351688 bytes/sec) Machine 1: openssl speed aes-128 cbc 91791.47k 94887.05k 96138.47k 96574.02k 96623.36k aes-192 cbc 80654.04k 84248.16k 85304.90k 85590.38k 85589.09k aes-256 cbc 72706.24k 75476.05k 75957.00k 76046.60k 76020.44k Machine 2: openssl speed aes-128 cbc 92457.48k 95876.89k 96900.91k 97227.52k 97223.53k aes-192 cbc 80875.87k 84916.79k 85773.97k 85996.90k 85978.43k aes-256 cbc 72943.78k 75833.00k 76466.32k 76631.74k 76642.40k Machine 1: time sed -f /usr/src/gnu/usr.bin/groff/tmac/../../../../contrib/groff/tmac/strip.sed /usr/src/gnu/usr.bin/groff/tmac/../../../../contrib/groff/tmac/doc-common > /dev/null real 0m0.059s user 0m0.013s sys 0m0.000s Machine 2: time sed -f /usr/src/gnu/usr.bin/groff/tmac/../../../../contrib/groff/tmac/strip.sed /usr/src/gnu/usr.bin/groff/tmac/../../../../contrib/groff/tmac/doc-common > /dev/null real 0m4.506s user 0m4.167s sys 0m0.000s Yes... you read that right... almost 400 _TIMES_ slower. WTF.. Where should I be looking? -- David E. Cross
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