c - 为什么抄送 "real time">> "real time"？-6ren

c - 为什么抄送 "real time">> "real time"？

转载作者：行者123 更新时间：2023-11-30 20:28:14

我的 c 编译器有问题当编译一个简单的hello world时，用户时间是>>>实时的。

这里是两台机器之间的时间比较。

需要注意的是，机器没有执行任何其他任务，其他操作运行得很快(甚至是其他编译器)

<小时/>

MACHINE 1
$<stress> cc -xtime -# test.c
/opt/SUNWspro/bin/../SC5.0/bin/acomp -i test.c -y-fbe -y/opt/SUNWspro/bin/../SC5.0    /bin/fbe -y-xarch=v7 -y-o -ytest.o -y-s -y-verbose -Qy -D__SunOS_5_7 -D__SUNPRO_C=0x500 -D__SVR4 -D__unix -D__sun -D__sparc -D__BUILTIN_VA_ARG_INCR -Xa -D__PRAGMA_REDEFINE_EXTNAME -Dunix -Dsun -Dsparc -D__RESTRICT -I/opt/SUNWspro/SC5.0    /include/cc "-g/opt/SUNWspro/bin/../SC5.0/bin/cc -xtime -c "
acomp           real    0.1     user    0.0     sys     0.0
 Note: LD_LIBRARY_PATH = /opt/oracle/product/9.2.0/lib:/opt/SUNWspro/lib:/lib:    /usr/ccs/lib:/usr/openwin/lib:/usr/dt/lib
 Note: LD_RUN_PATH = <null>
/usr/ccs/bin/ld /opt/SUNWspro/SC5.0/lib/crti.o /opt/SUNWspro/SC5.0/lib/crt1.o     /opt/SUNWspro/SC5.0/lib/values-xa.o test.o -Y "P,/opt/SUNWspro/SC5.0/lib:/usr/ccs/lib:    /usr/lib" -Qy -lc /opt/SUNWspro/SC5.0/lib/crtn.o
linker        real    0.1     user    0.0     sys     0.0

<小时/>

MACHINE 1
stress$ cc -xtime -# test.c
/opt/SUNWspro/bin/../SC5.0/bin/acomp -i test.c -y-fbe -y/opt/SUNWspro/bin/../SC5.0/bin/fbe -y-xarch=v7 -y-o -ytest.o -y-s -y-verbose -Qy -D__SunOS_5_8 -D__SUNPRO_C=0x500 -D__SVR4 -D__unix -D__sun -D__sparc -D__BUILTIN_VA_ARG_INCR -Xa -D__PRAGMA_REDEFINE_EXTNAME -Dunix -Dsun -Dsparc -D__RESTRICT -I/opt/SUNWspro/SC5.0/include/cc "-g/opt/SUNWspro/bin/../SC5.0/bin/cc -xtime -c "
acomp           real 6:00.0     user    0.0     sys     0.0
 Note: LD_LIBRARY_PATH = /lib:/opt/oracle/product/7.3.4/lib:/opt/SUNWspro/lib:/usr/ccs/lib:/usr/ucblib:/usr/openwin/lib:/usr/dt/lib
 Note: LD_RUN_PATH = <null>
/usr/ccs/bin/ld /opt/SUNWspro/SC5.0/lib/crti.o /opt/SUNWspro/SC5.0/lib/crt1.o /opt/SUNWspro/SC5.0/lib/values-xa.o test.o -Y "P,/opt/SUNWspro/SC5.0/lib:/usr/ccs/lib:/usr/lib" -Qy -lc /opt/SUNWspro/SC5.0/lib/crtn.o
linker          real    0.3     user    0.0     sys     0.0

<小时/>

此时编译已经完成，但最后红色的是编译前的等待信号20。这就是然后返回提示符的地方。

execve("/opt/SUNWspro/SC5.0/bin/cc", 0xFFBFF69C, 0xFFBFF6AC)  argc = 3
getuid()                                        = 1000 [1000]
getuid()                                        = 1000 [1000]
getgid()                                        = 1004 [1004]
getgid()                                        = 1004 [1004]
resolvepath("/usr/lib/ld.so.1", "/usr/lib/ld.so.1", 1023) = 16
open("/var/ld/ld.config", O_RDONLY)             = 3
fstat(3, 0xFFBFEEE8)                            = 0
mmap(0x00000000, 148, PROT_READ, MAP_SHARED, 3, 0) = 0xFF3E0000
close(3)                                        = 0
stat("/usr/lib/libc.so.1", 0xFFBFEF48)          = 0
resolvepath("/usr/lib/libc.so.1", "/usr/lib/libc.so.1", 1023) = 18
open("/usr/lib/libc.so.1", O_RDONLY)            = 3
mmap(0x00000000, 8192, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0xFF340000
mmap(0x00000000, 802816, PROT_NONE, MAP_PRIVATE|MAP_NORESERVE|MAP_ANON, -1, 0) = 0xFF200000
mmap(0xFF200000, 703520, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 0) = 0xFF200000
mmap(0xFF2BC000, 24772, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 704512) = 0xFF2BC000
munmap(0xFF2AC000, 65536)                       = 0
memcntl(0xFF200000, 113528, MC_ADVISE, MADV_WILLNEED, 0, 0) = 0
close(3)                                        = 0
stat("/usr/lib/libdl.so.1", 0xFFBFEF48)         = 0
resolvepath("/usr/lib/libdl.so.1", "/usr/lib/libdl.so.1", 1023) = 19
open("/usr/lib/libdl.so.1", O_RDONLY)           = 3
mmap(0xFF340000, 8192, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 0) = 0xFF340000
mmap(0x00000000, 8192, PROT_NONE, MAP_PRIVATE|MAP_NORESERVE|MAP_ANON, -1, 0) = 0xFF330000
mmap(0xFF330000, 2638, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 0) = 0xFF330000
close(3)                                        = 0
stat("/usr/platform/SUNW,Sun-Fire-V890/lib/libc_psr.so.1", 0xFFBFEC68) = 0
resolvepath("/usr/platform/SUNW,Sun-Fire-V890/lib/libc_psr.so.1", "/usr/platform/sun4u-us3/lib/libc_psr.so.1", 1023) = 41
open("/usr/platform/SUNW,Sun-Fire-V890/lib/libc_psr.so.1", O_RDONLY) = 3
mmap(0xFF340000, 8192, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 0) = 0xFF340000
close(3)                                        = 0
mmap(0x00000000, 8192, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANON, -1, 0) = 0xFF320000
dup(0)                                          = 3
llseek(0, 0, SEEK_CUR)                          = 749366
close(0)                                        = 0
fcntl(3, F_DUP2FD, 0x00000000)                  = 0
close(3)                                        = 0
dup(1)                                          = 3
close(1)                                        = 0
fcntl(3, F_DUP2FD, 0x00000001)                  = 1
close(3)                                        = 0
dup(2)                                          = 3
close(2)                                        = 0
fcntl(3, F_DUP2FD, 0x00000002)                  = 2
close(3)                                        = 0
sys#177(0x00000080, 0xFFBFF47C, 0xFF3F0500, 0x00000000, 0xFF3C2EF8, 0xFF2C0284) = 0x00000000 [0xFFBFF47C]
sys#227(0x00000006, 0x00000000, 0x0001ADFC, 0xFF3F0500, 0xFF3C3C18, 0xFF3C2670) = 0x00000009 [0x00000000]
sys#227(0x00000002, 0x00000009, 0x0000000E, 0xFFBFF5AE, 0x00000002, 0xFF3C2670) = 0x00000002 [0x00000000]
sys#177(0x00000001, 0xFFBFF508, 0x73797364, 0x6363002D, 0x00000002, 0xFF3C2670) = 0x00000000 [0xFFBFF508]
open("/.machine", O_RDONLY)                     Err#2 ENOENT
sys#177(0x00000003, 0xFFBFF4EC, 0x73797364, 0x6363002D, 0x00000002, 0xFF3C2670) = 0x00000000 [0xFFBFF4EC]
getuid()                                        = 1000 [1000]
getuid()                                        = 1000 [1000]
getgid()                                        = 1004 [1004]
getgid()                                        = 1004 [1004]
resolvepath("/usr/lib/ld.so.1", "/usr/lib/ld.so.1", 1023) = 16
open("/var/ld/ld.config", O_RDONLY)             = 3
fstat(3, 0xFFBFEEE8)                            = 0
mmap(0x00000000, 148, PROT_READ, MAP_SHARED, 3, 0) = 0xFF310000
close(3)                                        = 0
stat("/usr/lib/secure/s8_preload.so.1", 0xFFBFF020) = 0
resolvepath("/usr/lib/secure/s8_preload.so.1", "/.SUNWnative/usr/lib/brand/solaris8/s8_preload.so.1", 1023) = 51
open("/usr/lib/secure/s8_preload.so.1", O_RDONLY) = 3
mmap(0x00000000, 8192, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0xFF300000
mmap(0x00002000, 81920, PROT_NONE, MAP_PRIVATE|MAP_NORESERVE|MAP_ANON, -1, 0) = 0xFF2E0000
mmap(0xFF2E0000, 920, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 0) = 0xFF2E0000
mmap(0xFF2F2000, 272, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 8192) = 0xFF2F2000
munmap(0xFF2E2000, 65536)                       = 0
memcntl(0xFF2E0000, 736, MC_ADVISE, MADV_WILLNEED, 0, 0) = 0
close(3)                                        = 0
stat("/opt/oracle/product/7.3.4/lib/libc.so.1", 0xFFBFEF48) Err#2 ENOENT
stat("/usr/lib/libc.so.1", 0xFFBFEF48)          = 0
resolvepath("/usr/lib/libc.so.1", "/usr/lib/libc.so.1", 1023) = 18
open("/usr/lib/libc.so.1", O_RDONLY)            = 3
mmap(0xFF300000, 8192, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 0) = 0xFF300000
mmap(0x00000000, 802816, PROT_NONE, MAP_PRIVATE|MAP_NORESERVE|MAP_ANON, -1, 0) = 0xFF100000
mmap(0xFF100000, 703520, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 0) = 0xFF100000
mmap(0xFF1BC000, 24772, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 704512) = 0xFF1BC000
munmap(0xFF1AC000, 65536)                       = 0
memcntl(0xFF100000, 113528, MC_ADVISE, MADV_WILLNEED, 0, 0) = 0
close(3)                                        = 0
stat("/opt/oracle/product/7.3.4/lib/libdl.so.1", 0xFFBFEF48) Err#2 ENOENT
stat("/usr/lib/libdl.so.1", 0xFFBFEF48)         = 0
resolvepath("/usr/lib/libdl.so.1", "/usr/lib/libdl.so.1", 1023) = 19
open("/usr/lib/libdl.so.1", O_RDONLY)           = 3
mmap(0xFF300000, 8192, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 0) = 0xFF300000
mmap(0x00000000, 8192, PROT_NONE, MAP_PRIVATE|MAP_NORESERVE|MAP_ANON, -1, 0) = 0xFF2D0000
mmap(0xFF2D0000, 2638, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 0) = 0xFF2D0000
close(3)                                        = 0
mmap(0x00000000, 8192, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANON, -1, 0) = 0xFF2B0000
stat("/usr/platform/SUNW,Sun-Fire-V890/lib/libc_psr.so.1", 0xFFBFEC68) = 0
resolvepath("/usr/platform/SUNW,Sun-Fire-V890/lib/libc_psr.so.1", "/usr/platform/sun4u-us3/lib/libc_psr.so.1", 1023) = 41
open("/usr/platform/SUNW,Sun-Fire-V890/lib/libc_psr.so.1", O_RDONLY) = 3
mmap(0xFF300000, 8192, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 0) = 0xFF300000
close(3)                                        = 0
sys#229(0x00046ED8, 0x00000400)                 = 0x00000000 [0x00000400]
brk(0x000477D0)                                 = 0
brk(0x000497D0)                                 = 0
stat("/opt/oracle/product/7.3.4/bin/cc", 0xFFBFEC28) Err#2 ENOENT
stat("/appl/prod/siscel/util/cc", 0xFFBFEC28)   Err#2 ENOENT
stat("/solaris7/usr/ccs/bin/cc", 0xFFBFEC28)    Err#2 ENOENT
stat("/opt/SUNWspro/bin/cc", 0xFFBFEC28)        = 0
readlink("/opt/SUNWspro/bin/cc", "../SC5.0/bin/cc", 1024) = 15
readlink("/opt/SUNWspro/bin/../SC5.0/bin/cc", 0xFFBFED14, 1024) Err#22 EINVAL
open("/opt/SUNWspro/bin/../SC5.0/bin/../lib/locale/C/LC_MESSAGES/SUNW_SPRO_SC_cc.cat", O_RDONLY) Err#2 ENOENT
open("/opt/SUNWspro/bin/../SC5.0/bin/../../lib/locale/C/LC_MESSAGES/SUNW_SPRO_SC_cc.cat", O_RDONLY) Err#2 ENOENT
lwp_sigtimedwait(0xFFBFF518, 0xFFBFF3D8, 0x00000020) = 0
lwp_sigtimedwait(0xFFBFF3E0, 0xFFBFF308, 0x00000010) = 0
sysconfig(_CONFIG_SIGRT_MIN)                    = 41
sysconfig(_CONFIG_SIGRT_MAX)                    = 48
lwp_sigtimedwait(0xFFBFF2F8, 0xFFBFF3E0, 0x00000010) = 0
sigaction(SIGHUP, 0xFFBFF3D8, 0xFFBFF3B0)       = 0
lwp_sigtimedwait(0xFFBFF3B8, 0xFFBFF308, 0x00000010) = 0
lwp_sigtimedwait(0xFFBFF2F8, 0xFFBFF3B8, 0x00000010) = 0
lwp_sigtimedwait(0xFFBFF3B0, 0xFFBFF598, 0x00000020) = 0
lwp_sigtimedwait(0xFFBFF518, 0xFFBFF3D8, 0x00000020) = 0
lwp_sigtimedwait(0xFFBFF3E0, 0xFFBFF308, 0x00000010) = 0
lwp_sigtimedwait(0xFFBFF2F8, 0xFFBFF3E0, 0x00000010) = 0
sigprocmask(SIG_BLOCK, 0xFFBFF3A0, 0xFFBFF388)  = 0
sigaction(SIGHUP, 0xFFBFF3D8, 0xFFBFF3B0)       = 0
lwp_sigtimedwait(0xFFBFF3B8, 0xFFBFF308, 0x00000010) = 0
lwp_sigtimedwait(0xFFBFF2F8, 0xFFBFF3B8, 0x00000010) = 0
lwp_sigtimedwait(0xFFBFF3B0, 0xFFBFF598, 0x00000020) = 0
sigprocmask(SIG_SETMASK, 0xFFBFF388, 0x00000000) = 0
lwp_sigtimedwait(0xFFBFF518, 0xFFBFF3D8, 0x00000020) = 0
lwp_sigtimedwait(0xFFBFF3E0, 0xFFBFF308, 0x00000010) = 0
lwp_sigtimedwait(0xFFBFF2F8, 0xFFBFF3E0, 0x00000010) = 0
sigaction(SIGINT, 0xFFBFF3D8, 0xFFBFF3B0)       = 0
lwp_sigtimedwait(0xFFBFF3B8, 0xFFBFF308, 0x00000010) = 0
lwp_sigtimedwait(0xFFBFF2F8, 0xFFBFF3B8, 0x00000010) = 0
lwp_sigtimedwait(0xFFBFF3B0, 0xFFBFF598, 0x00000020) = 0
lwp_sigtimedwait(0xFFBFF518, 0xFFBFF3D8, 0x00000020) = 0
lwp_sigtimedwait(0xFFBFF3E0, 0xFFBFF308, 0x00000010) = 0
lwp_sigtimedwait(0xFFBFF2F8, 0xFFBFF3E0, 0x00000010) = 0
sigprocmask(SIG_BLOCK, 0xFFBFF3A0, 0xFFBFF388)  = 0
sigaction(SIGINT, 0xFFBFF3D8, 0xFFBFF3B0)       = 0
lwp_sigtimedwait(0xFFBFF3B8, 0xFFBFF308, 0x00000010) = 0
lwp_sigtimedwait(0xFFBFF2F8, 0xFFBFF3B8, 0x00000010) = 0
lwp_sigtimedwait(0xFFBFF3B0, 0xFFBFF598, 0x00000020) = 0
sigprocmask(SIG_SETMASK, 0xFFBFF388, 0x00000000) = 0
lwp_sigtimedwait(0xFFBFF518, 0xFFBFF3D8, 0x00000020) = 0
lwp_sigtimedwait(0xFFBFF3E0, 0xFFBFF308, 0x00000010) = 0
lwp_sigtimedwait(0xFFBFF2F8, 0xFFBFF3E0, 0x00000010) = 0
sigaction(SIGTERM, 0xFFBFF3D8, 0xFFBFF3B0)      = 0
lwp_sigtimedwait(0xFFBFF3B8, 0xFFBFF308, 0x00000010) = 0
lwp_sigtimedwait(0xFFBFF2F8, 0xFFBFF3B8, 0x00000010) = 0
lwp_sigtimedwait(0xFFBFF3B0, 0xFFBFF598, 0x00000020) = 0
lwp_sigtimedwait(0xFFBFF518, 0xFFBFF3D8, 0x00000020) = 0
lwp_sigtimedwait(0xFFBFF3E0, 0xFFBFF308, 0x00000010) = 0
lwp_sigtimedwait(0xFFBFF2F8, 0xFFBFF3E0, 0x00000010) = 0
sigprocmask(SIG_BLOCK, 0xFFBFF3A0, 0xFFBFF388)  = 0
sigaction(SIGTERM, 0xFFBFF3D8, 0xFFBFF3B0)      = 0
lwp_sigtimedwait(0xFFBFF3B8, 0xFFBFF308, 0x00000010) = 0
lwp_sigtimedwait(0xFFBFF2F8, 0xFFBFF3B8, 0x00000010) = 0
lwp_sigtimedwait(0xFFBFF3B0, 0xFFBFF598, 0x00000020) = 0
sigprocmask(SIG_SETMASK, 0xFFBFF388, 0x00000000) = 0
lwp_sigtimedwait(0xFFBFF518, 0xFFBFF3D8, 0x00000020) = 0
lwp_sigtimedwait(0xFFBFF3E0, 0xFFBFF308, 0x00000010) = 0
lwp_sigtimedwait(0xFFBFF2F8, 0xFFBFF3E0, 0x00000010) = 0
sigaction(SIGPIPE, 0xFFBFF3D8, 0xFFBFF3B0)      = 0
lwp_sigtimedwait(0xFFBFF3B8, 0xFFBFF308, 0x00000010) = 0
lwp_sigtimedwait(0xFFBFF2F8, 0xFFBFF3B8, 0x00000010) = 0
lwp_sigtimedwait(0xFFBFF3B0, 0xFFBFF598, 0x00000020) = 0
lwp_sigtimedwait(0xFFBFF518, 0xFFBFF3D8, 0x00000020) = 0
lwp_sigtimedwait(0xFFBFF3E0, 0xFFBFF308, 0x00000010) = 0
lwp_sigtimedwait(0xFFBFF2F8, 0xFFBFF3E0, 0x00000010) = 0
sigprocmask(SIG_BLOCK, 0xFFBFF3A0, 0xFFBFF388)  = 0
sigaction(SIGPIPE, 0xFFBFF3D8, 0xFFBFF3B0)      = 0
lwp_sigtimedwait(0xFFBFF3B8, 0xFFBFF308, 0x00000010) = 0
lwp_sigtimedwait(0xFFBFF2F8, 0xFFBFF3B8, 0x00000010) = 0
lwp_sigtimedwait(0xFFBFF3B0, 0xFFBFF598, 0x00000020) = 0
sigprocmask(SIG_SETMASK, 0xFFBFF388, 0x00000000) = 0
brk(0x000497D0)                                 = 0
brk(0x0004B7D0)                                 = 0
uname(0xFFBFEAA8)                               = 1
lwp_sigtimedwait(0xFFBFEAA8, 0xFFBFF0D0, 0x00000505) = 0
fork()                                          = 10196
wait()                          (sleeping...)
    Received signal #20, SIGWINCH, in wait() [default]
      siginfo: SIG#0
    Received signal #20, SIGWINCH, in wait() [default]
      siginfo: SIG#0
wait()                          (sleeping...)
wait()                                          = 10196 [0x0000]
llseek(0, 0, SEEK_CUR)                          = 757598
_exit(0)

知道去哪里看吗？

最佳答案

实时(即挂钟时间)始终大于用户(应用程序)和系统(操作系统)时间的总和。

程序在进行输入/输出操作时没有CPU占用，显然编译是需要大量I/O的事情。

关于c - 为什么抄送 "real time">> "real time"？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/9823989/

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c - 为什么抄送 "real time">> "real time"？