Difference in command execution time #4237

minovations · 2023-10-09T09:03:15Z

minovations
Oct 9, 2023

Whithin our cluster we discoverred some strange behaviour. While executing ls in from the home folder, it takes some milliseconds. After cd into a gluster folder, the execution time of ls increases.

[jsle@radstation26 ~]# time ls /home
g10037361 jsle

real 0m0.002s
user 0m0.000s
sys 0m0.002s

[jsle@radstation26 glusterdrive]$ cd /glusterdrive
[jsle@radstation26 glusterdrive]$ time ls /home

g10037361 jsle

real 0m1.370s
user 0m0.000s
sys 0m0.005sssss

Does anyone know where the rootcause of this behaviour could be found?

dlucredativ · 2023-10-09T14:31:16Z

dlucredativ
Oct 9, 2023

strace --relative-timestamps=ms ls /home

0 replies

minovations · 2023-10-09T15:11:34Z

minovations
Oct 9, 2023
Author

strace executed in /home
strace --relative-timestamps=ms ls /home 2>&1 | tee -a ~/home.strace

 0.000 execve("/bin/ls", ["ls", "/home"], 0x7ffe5ad45530 /* 65 vars */) = 0
 0.000 brk(NULL)                    = 0x56023a2bf000
 0.000 arch_prctl(0x3001 /* ARCH_??? */, 0x7ffcf3653840) = -1 EINVAL (Invalid argument)
 0.000 mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f5a59323000
 0.000 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "glibc-hwcaps/x86-64-v3/libselinux.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "glibc-hwcaps/x86-64-v2/libselinux.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "tls/haswell/x86_64/libselinux.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "tls/haswell/libselinux.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "tls/x86_64/libselinux.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "tls/libselinux.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "haswell/x86_64/libselinux.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "haswell/libselinux.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "x86_64/libselinux.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "libselinux.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "/opt/mumc/apps/matlab/toolboxes/ExploreDTI-unknown/Source/MD_cor_E/linux64/glibc-hwcaps/x86-64-v3/libselinux.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 newfstatat(AT_FDCWD, "/opt/mumc/apps/matlab/toolboxes/ExploreDTI-unknown/Source/MD_cor_E/linux64/glibc-hwcaps/x86-64-v3", 0x7ffcf3652a70, 0) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "/opt/mumc/apps/matlab/toolboxes/ExploreDTI-unknown/Source/MD_cor_E/linux64/glibc-hwcaps/x86-64-v2/libselinux.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 newfstatat(AT_FDCWD, "/opt/mumc/apps/matlab/toolboxes/ExploreDTI-unknown/Source/MD_cor_E/linux64/glibc-hwcaps/x86-64-v2", 0x7ffcf3652a70, 0) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "/opt/mumc/apps/matlab/toolboxes/ExploreDTI-unknown/Source/MD_cor_E/linux64/tls/haswell/x86_64/libselinux.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 newfstatat(AT_FDCWD, "/opt/mumc/apps/matlab/toolboxes/ExploreDTI-unknown/Source/MD_cor_E/linux64/tls/haswell/x86_64", 0x7ffcf3652a70, 0) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "/opt/mumc/apps/matlab/toolboxes/ExploreDTI-unknown/Source/MD_cor_E/linux64/tls/haswell/libselinux.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 newfstatat(AT_FDCWD, "/opt/mumc/apps/matlab/toolboxes/ExploreDTI-unknown/Source/MD_cor_E/linux64/tls/haswell", 0x7ffcf3652a70, 0) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "/opt/mumc/apps/matlab/toolboxes/ExploreDTI-unknown/Source/MD_cor_E/linux64/tls/x86_64/libselinux.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 newfstatat(AT_FDCWD, "/opt/mumc/apps/matlab/toolboxes/ExploreDTI-unknown/Source/MD_cor_E/linux64/tls/x86_64", 0x7ffcf3652a70, 0) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "/opt/mumc/apps/matlab/toolboxes/ExploreDTI-unknown/Source/MD_cor_E/linux64/tls/libselinux.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 newfstatat(AT_FDCWD, "/opt/mumc/apps/matlab/toolboxes/ExploreDTI-unknown/Source/MD_cor_E/linux64/tls", 0x7ffcf3652a70, 0) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "/opt/mumc/apps/matlab/toolboxes/ExploreDTI-unknown/Source/MD_cor_E/linux64/haswell/x86_64/libselinux.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 newfstatat(AT_FDCWD, "/opt/mumc/apps/matlab/toolboxes/ExploreDTI-unknown/Source/MD_cor_E/linux64/haswell/x86_64", 0x7ffcf3652a70, 0) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "/opt/mumc/apps/matlab/toolboxes/ExploreDTI-unknown/Source/MD_cor_E/linux64/haswell/libselinux.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 newfstatat(AT_FDCWD, "/opt/mumc/apps/matlab/toolboxes/ExploreDTI-unknown/Source/MD_cor_E/linux64/haswell", 0x7ffcf3652a70, 0) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "/opt/mumc/apps/matlab/toolboxes/ExploreDTI-unknown/Source/MD_cor_E/linux64/x86_64/libselinux.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 newfstatat(AT_FDCWD, "/opt/mumc/apps/matlab/toolboxes/ExploreDTI-unknown/Source/MD_cor_E/linux64/x86_64", 0x7ffcf3652a70, 0) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "/opt/mumc/apps/matlab/toolboxes/ExploreDTI-unknown/Source/MD_cor_E/linux64/libselinux.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 newfstatat(AT_FDCWD, "/opt/mumc/apps/matlab/toolboxes/ExploreDTI-unknown/Source/MD_cor_E/linux64", {st_mode=S_IFDIR|0770, st_size=98, ...}, 0) = 0
 0.000 openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
 0.000 newfstatat(3, "", {st_mode=S_IFREG|0644, st_size=63179, ...}, AT_EMPTY_PATH) = 0
 0.000 mmap(NULL, 63179, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f5a59313000
 0.000 close(3)                     = 0
 0.000 openat(AT_FDCWD, "/lib64/libselinux.so.1", O_RDONLY|O_CLOEXEC) = 3
 0.000 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0Pp\0\0\0\0\0\0"..., 832) = 832
 0.000 newfstatat(3, "", {st_mode=S_IFREG|0755, st_size=175552, ...}, AT_EMPTY_PATH) = 0
 0.000 mmap(NULL, 181896, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f5a592e6000
 0.000 mmap(0x7f5a592ec000, 110592, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x6000) = 0x7f5a592ec000
 0.000 mmap(0x7f5a59307000, 32768, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x21000) = 0x7f5a59307000
 0.000 mmap(0x7f5a5930f000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x28000) = 0x7f5a5930f000
 0.000 mmap(0x7f5a59311000, 5768, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f5a59311000
 0.000 close(3)                     = 0
 0.000 openat(AT_FDCWD, "glibc-hwcaps/x86-64-v3/libcap.so.2", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "glibc-hwcaps/x86-64-v2/libcap.so.2", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "tls/haswell/x86_64/libcap.so.2", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "tls/haswell/libcap.so.2", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "tls/x86_64/libcap.so.2", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "tls/libcap.so.2", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "haswell/x86_64/libcap.so.2", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "haswell/libcap.so.2", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "x86_64/libcap.so.2", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "libcap.so.2", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "/opt/mumc/apps/matlab/toolboxes/ExploreDTI-unknown/Source/MD_cor_E/linux64/libcap.so.2", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "/lib64/libcap.so.2", O_RDONLY|O_CLOEXEC) = 3
 0.000 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0P'\0\0\0\0\0\0"..., 832) = 832
 0.000 newfstatat(3, "", {st_mode=S_IFREG|0755, st_size=36304, ...}, AT_EMPTY_PATH) = 0
 0.000 mmap(NULL, 36920, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f5a592dc000
 0.000 mmap(0x7f5a592de000, 16384, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7f5a592de000
 0.000 mmap(0x7f5a592e2000, 8192, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x6000) = 0x7f5a592e2000
 0.000 mmap(0x7f5a592e4000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x7000) = 0x7f5a592e4000
 0.000 close(3)                     = 0
 0.000 openat(AT_FDCWD, "glibc-hwcaps/x86-64-v3/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "glibc-hwcaps/x86-64-v2/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "tls/haswell/x86_64/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "tls/haswell/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "tls/x86_64/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "tls/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "haswell/x86_64/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "haswell/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "x86_64/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "/opt/mumc/apps/matlab/toolboxes/ExploreDTI-unknown/Source/MD_cor_E/linux64/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "/lib64/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
 0.000 read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0p\0\4\0\0\0\0\0"..., 832) = 832
 0.000 pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 784, 64) = 784
 0.000 pread64(3, "\4\0\0\0 \0\0\0\5\0\0\0GNU\0\2\0\0\300\4\0\0\0\3\0\0\0\0\0\0\0"..., 48, 848) = 48
 0.000 pread64(3, "\4\0\0\0\24\0\0\0\3\0\0\0GNU\0\263\235F\212\352\326\331\355\342'u\37\376\t=\242"..., 68, 896) = 68
 0.000 newfstatat(3, "", {st_mode=S_IFREG|0755, st_size=2387200, ...}, AT_EMPTY_PATH) = 0
 0.000 pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 784, 64) = 784
 0.000 mmap(NULL, 2133936, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f5a59000000
 0.000 mprotect(0x7f5a59028000, 1892352, PROT_NONE) = 0
 0.000 mmap(0x7f5a59028000, 1527808, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x28000) = 0x7f5a59028000
 0.000 mmap(0x7f5a5919d000, 360448, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x19d000) = 0x7f5a5919d000
 0.000 mmap(0x7f5a591f6000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1f5000) = 0x7f5a591f6000
 0.000 mmap(0x7f5a591fc000, 53168, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f5a591fc000
 0.000 close(3)                     = 0
 0.000 openat(AT_FDCWD, "glibc-hwcaps/x86-64-v3/libpcre2-8.so.0", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "glibc-hwcaps/x86-64-v2/libpcre2-8.so.0", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "tls/haswell/x86_64/libpcre2-8.so.0", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "tls/haswell/libpcre2-8.so.0", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "tls/x86_64/libpcre2-8.so.0", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "tls/libpcre2-8.so.0", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "haswell/x86_64/libpcre2-8.so.0", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "haswell/libpcre2-8.so.0", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "x86_64/libpcre2-8.so.0", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "libpcre2-8.so.0", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "/opt/mumc/apps/matlab/toolboxes/ExploreDTI-unknown/Source/MD_cor_E/linux64/libpcre2-8.so.0", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 0.000 openat(AT_FDCWD, "/lib64/libpcre2-8.so.0", O_RDONLY|O_CLOEXEC) = 3
 0.000 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\220$\0\0\0\0\0\0"..., 832) = 832
 0.000 newfstatat(3, "", {st_mode=S_IFREG|0755, st_size=637880, ...}, AT_EMPTY_PATH) = 0
 0.000 mmap(NULL, 635440, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f5a59240000
 0.000 mmap(0x7f5a59242000, 446464, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7f5a59242000
 0.000 mmap(0x7f5a592af000, 176128, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x6f000) = 0x7f5a592af000
 0.000 mmap(0x7f5a592da000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x99000) = 0x7f5a592da000
 0.000 close(3)                     = 0
 0.000 mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f5a5923e000
 0.000 arch_prctl(ARCH_SET_FS, 0x7f5a5923ec40) = 0
 0.000 set_tid_address(0x7f5a5923ef10) = 8390
 0.000 set_robust_list(0x7f5a5923ef20, 24) = 0
 0.000 rseq(0x7f5a5923f5e0, 0x20, 0, 0x53053053) = 0
 0.000 mprotect(0x7f5a591f6000, 16384, PROT_READ) = 0
 0.000 mprotect(0x7f5a592da000, 4096, PROT_READ) = 0
 0.000 mprotect(0x7f5a592e4000, 4096, PROT_READ) = 0
 0.000 mprotect(0x7f5a5930f000, 4096, PROT_READ) = 0
 0.000 mprotect(0x5602382bf000, 8192, PROT_READ) = 0
 0.000 mprotect(0x7f5a59359000, 8192, PROT_READ) = 0
 0.000 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
 0.000 munmap(0x7f5a59313000, 63179) = 0
 0.000 prctl(PR_CAPBSET_READ, CAP_MAC_OVERRIDE) = 1
 0.000 prctl(PR_CAPBSET_READ, 0x30 /* CAP_??? */) = -1 EINVAL (Invalid argument)
 0.000 prctl(PR_CAPBSET_READ, CAP_CHECKPOINT_RESTORE) = 1
 0.000 prctl(PR_CAPBSET_READ, 0x2c /* CAP_??? */) = -1 EINVAL (Invalid argument)
 0.000 prctl(PR_CAPBSET_READ, 0x2a /* CAP_??? */) = -1 EINVAL (Invalid argument)
 0.000 prctl(PR_CAPBSET_READ, 0x29 /* CAP_??? */) = -1 EINVAL (Invalid argument)
 0.000 statfs("/sys/fs/selinux", 0x7ffcf36537d0) = -1 ENOENT (No such file or directory)
 0.000 statfs("/selinux", 0x7ffcf36537d0) = -1 ENOENT (No such file or directory)
 0.000 getrandom("\x67\x57\xe0\x96\x3b\xd1\x15\x0e", 8, GRND_NONBLOCK) = 8
 0.000 brk(NULL)                    = 0x56023a2bf000
 0.000 brk(0x56023a2e0000)          = 0x56023a2e0000
 0.000 openat(AT_FDCWD, "/proc/filesystems", O_RDONLY|O_CLOEXEC) = 3
 0.000 newfstatat(3, "", {st_mode=S_IFREG|0444, st_size=0, ...}, AT_EMPTY_PATH) = 0
 0.000 read(3, "nodev\tsysfs\nnodev\ttmpfs\nnodev\tbd"..., 1024) = 354
 0.000 read(3, "", 1024)            = 0
 0.000 close(3)                     = 0
 0.000 access("/etc/selinux/config", F_OK) = 0
 0.000 openat(AT_FDCWD, "/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3
 0.000 newfstatat(3, "", {st_mode=S_IFREG|0644, st_size=223542144, ...}, AT_EMPTY_PATH) = 0
 0.000 mmap(NULL, 223542144, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f5a4ba00000
 0.000 close(3)                     = 0
 0.000 ioctl(1, TCGETS, 0x7ffcf3653700) = -1 ENOTTY (Inappropriate ioctl for device)
 0.000 ioctl(1, TIOCGWINSZ, 0x7ffcf36537f0) = -1 ENOTTY (Inappropriate ioctl for device)
 0.000 statx(AT_FDCWD, "/home", AT_STATX_SYNC_AS_STAT|AT_NO_AUTOMOUNT, STATX_MODE, {stx_mask=STATX_BASIC_STATS|STATX_MNT_ID, stx_attributes=STATX_ATTR_MOUNT_ROOT, stx_mode=S_IFDIR|0755, stx_size=35, ...}) = 0
 0.000 openat(AT_FDCWD, "/home", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3
 0.000 newfstatat(3, "", {st_mode=S_IFDIR|0755, st_size=35, ...}, AT_EMPTY_PATH) = 0
 0.000 getdents64(3, 0x56023a2c5a30 /* 4 entries */, 32768) = 104
 0.000 getdents64(3, 0x56023a2c5a30 /* 0 entries */, 32768) = 0
 0.000 close(3)                     = 0
 0.000 newfstatat(1, "", {st_mode=S_IFIFO|0600, st_size=0, ...}, AT_EMPTY_PATH) = 0
 0.000 write(1, "g10037361\njsle\n", 15g10037361

jsle
) = 15
0.000 close(1) = 0
0.000 close(2) = 0
0.000 exit_group(0) = ?
0.000 +++ exited with 0 +++

7 replies

minovations Oct 10, 2023
Author

We are running Rocky_linux 9.2.

echo $LD_LIBRARY_PATH
:/opt/mumc/apps/matlab/toolboxes/ExploreDTI-unknown/Source/MD_cor_E/linux64:/opt/mumc/apps/matlab/toolboxes/ExploreDTI-unknown/Source/MD_cor_E/linux64:/opt/mumc/apps/matlab/toolboxes/ExploreDTI-unknown/Source/MD_cor_E/linux64:/opt/mumc/apps/matlab/toolboxes/ExploreDTI-unknown/Source/MD_cor_E/linux64

What do you mean with LD_LIBRARY_PATH = strace {which command}

dlucredativ Oct 10, 2023

You have to ask the person who set LD_LIBRARY_PATH, if they put the : at the beginning on purpose. If they didn't, remove it and the ls call should run faster.

minovations Oct 10, 2023
Author

You are a hero, the execution time is much faster, equal to executing this at /home. What I can't explain is the reason why executing the command within a glustershare is much slower. The semicolon is/was also there when executing the command in /home. Do you have an explanation for that?

dlucredativ Oct 10, 2023

From man 8 ld.so:

LD_LIBRARY_PATH
A list of directories in which to search for ELF libraries at execution time. The items in the list are sep‐
arated by either colons or semicolons, and there is no support for escaping either separator. A zero-length
directory name indicates the current working directory.

minovations Oct 10, 2023
Author

As said, this solved the issue. Thanks for your support....

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