Thread: [lc-devel] dd ENOMEM problems
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From: Claudio M. <cla...@po...> - 2002-11-08 11:24:10
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this is what i get:
junior:~# dd if=/dev/cdrom of=/dev/null
dd: opening `/dev/cdrom': Cannot allocate memory
junior:~# strace dd if=/dev/hdc of=/dev/null bs=1024
execve("/bin/dd", ["dd", "if=/dev/hdc", "of=/dev/null", "bs=1024"], [/*
31 vars */]) = 0
uname({sys="Linux", node="junior", ...}) = 0
brk(0) = 0x804fcd8
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or
directory)
open("/etc/ld.so.preload", O_RDONLY) = -1 ENOENT (No such file or
directory)
open("/etc/ld.so.cache", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=57835, ...}) = 0
old_mmap(NULL, 57835, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40012000
close(3) = 0
open("/lib/libc.so.6", O_RDONLY) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0@Z\1\000"...,
1024) = 1024
fstat64(3, {st_mode=S_IFREG|0755, st_size=1109900, ...}) = 0
old_mmap(NULL, 1122692, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) =
0x40021000
mprotect(0x4012a000, 37252, PROT_NONE) = 0
old_mmap(0x4012a000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED,
3, 0x109000) = 0x4012a000
old_mmap(0x4012f000, 16772, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x4012f000
close(3) = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
-1, 0) = 0x40134000
munmap(0x40012000, 57835) = 0
brk(0) = 0x804fcd8
brk(0x8050cd8) = 0x8050cd8
brk(0x8051000) = 0x8051000
close(0) = 0
open("/dev/hdc", O_RDONLY|O_LARGEFILE) = -1 ENOMEM (Cannot allocate
memory)
write(2, "dd: ", 4dd: ) = 4
write(2, "opening `/dev/hdc\'", 18opening `/dev/hdc') = 18
write(2, ": Cannot allocate memory", 24: Cannot allocate memory) = 24
write(2, "\n", 1
) = 1
_exit(1) = ?
junior:~# free
total used free shared buffers
cached
Mem: 126508 117052 9456 0
5796 55684
-/+ buffers/cache: 55572 70936
Swap: 151192 78200 72992
junior:~# cat /proc/meminfo
total: used: free: shared: buffers: cached:
Mem: 129544192 125943808 3600384 0 7217152 69705728
Swap: 154820608 78082048 76738560
MemTotal: 126508 kB
MemFree: 3516 kB
MemShared: 0 kB
Buffers: 7048 kB
Cached: 56000 kB
CCacheAlloc: 14952 kB
CCacheUsed: 4162504 kB
SwapCached: 12072 kB
Active: 64032 kB
Inactive: 33272 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 126508 kB
LowFree: 3516 kB
SwapTotal: 151192 kB
SwapFree: 74940 kB
junior:~# uname -a
Linux junior 2.4.19-ck10 #2 Tue Oct 15 14:31:43 CEST 2002 i686 unknown
unknown GNU/Linux
junior:/usr/src# cat /proc/comp_cache_*
compressed cache - fragmentation histogram (free space x fragmented space)
total <1000 -2000 -3000 -4000 -5000 -6000 -7000 -8000 8192
1 - 400: 1639 1522 91 22 4 0 0 0 0 0
401 - 800: 118 111 7 0 0 0 0 0 0 0
801 - 1200: 64 62 2 0 0 0 0 0 0 0
1201 - 1600: 30 29 0 0 0 1 0 0 0 0
1601 - 2000: 19 19 0 0 0 0 0 0 0 0
2001 - 2400: 9 9 0 0 0 0 0 0 0 0
2401 - 2800: 3 3 0 0 0 0 0 0 0 0
2801 - 3200: 0 0 0 0 0 0 0 0 0 0
3201 - 3600: 1 1 0 0 0 0 0 0 0 0
3601 - 4000: 0 0 0 0 0 0 0 0 0 0
4001 - 4400: 0 0 0 0 0 0 0 0 0 0
4401 - 4800: 0 0 0 0 0 0 0 0 0 0
4801 - 5200: 0 0 0 0 0 0 0 0 0 0
5201 - 5600: 0 0 0 0 0 0 0 0 0 0
5601 - 6000: 0 0 0 0 0 0 0 0 0 0
6001 - 6400: 0 0 0 0 0 0 0 0 0 0
6401 - 6800: 0 0 0 0 0 0 0 0 0 0
6801 - 7200: 0 0 0 0 0 0 0 0 0 0
7201 - 7600: 0 0 0 0 0 0 0 0 0 0
7601 - 8000: 0 0 0 0 0 0 0 0 0 0
8001 - 8192: 0 0 0 0 0 0 0 0 0 0
compressed cache - free space histogram (free space x number of fragments)
total 0f 1f 2f 3f 4f 5f 6f more
total 9149 act 3743 pages 3774
0: 4 0 0 1 0 2 1 0 0
1 - 400: 1639 0 0 2 210 575 404 235 213
401 - 800: 118 0 0 1 28 34 27 14 14
801 - 1200: 64 0 0 3 19 19 14 3 6
1201 - 1600: 30 0 0 3 7 13 3 3 1
1601 - 2000: 19 0 0 1 6 7 3 2 0
2001 - 2400: 9 0 0 0 3 6 0 0 0
2401 - 2800: 3 0 0 0 1 1 1 0 0
2801 - 3200: 0 0 0 0 0 0 0 0 0
3201 - 3600: 1 0 0 0 1 0 0 0 0
3601 - 4000: 0 0 0 0 0 0 0 0 0
4001 - 4400: 0 0 0 0 0 0 0 0 0
4401 - 4800: 0 0 0 0 0 0 0 0 0
4801 - 5200: 0 0 0 0 0 0 0 0 0
5201 - 5600: 0 0 0 0 0 0 0 0 0
5601 - 6000: 0 0 0 0 0 0 0 0 0
6001 - 6400: 0 0 0 0 0 0 0 0 0
6401 - 6800: 0 0 0 0 0 0 0 0 0
6801 - 7200: 0 0 0 0 0 0 0 0 0
7201 - 7600: 0 0 0 0 0 0 0 0 0
7601 - 8000: 0 0 0 0 0 0 0 0 0
8001 - 8192: 0 0 0 0 0 0 0 0 0
compressed cache - statistics
general
- (S) swap cache support enabled
- (P) page cache support enabled
- compressed swap support enabled
- maximum used size: 16384 KiB
- comp page size: 8 KiB
- failed allocations: 742
algorithm LZO
- (C) compressed pages: 4134129 (S: 3% P: 96%)
- (D) decompressed pages: 1059944 (S: 8% P: 91%) D/C: 25%
- (R) read pages: 1012456 (S: 2% P: 97%) R/C: 24%
- (W) written pages: 55168 (S: 100% P: 0%) W/C: 1%
compression ratio: 51% (S: 32% P: 51%)
junior:/usr/src# vmstat
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
0 0 0 76240 3388 7816 53404 0 0 5 17 16 20 1 0 99
junior:/usr/src# uptime
12:10:33 up 20 days, 22:18, 4 users, load average: 0.10, 0.10, 0.09
after a reboot everything was fine.
tell me if you need something more :)
bye
--
Claudio Martella
Dipartimento Sostegni Informatici
alle Attivita' Didattiche e Scientifiche di Ateneo
Politecnico di Milano
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From: Rodrigo S. de C. <rc...@im...> - 2002-11-23 01:15:48
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Hi Claudio, Sorry for the delay. Better late than never :-) On Fri, Nov 08, 2002 at 12:23:51PM +0100, Claudio Martella wrote: > this is what i get: > > junior:~# dd if=/dev/cdrom of=/dev/null > dd: opening `/dev/cdrom': Cannot allocate memory [snip] > junior:~# cat /proc/meminfo > total: used: free: shared: buffers: cached: > Mem: 129544192 125943808 3600384 0 7217152 69705728 > Swap: 154820608 78082048 76738560 > MemTotal: 126508 kB > MemFree: 3516 kB > MemShared: 0 kB > Buffers: 7048 kB > Cached: 56000 kB > CCacheAlloc: 14952 kB > CCacheUsed: 4162504 kB This "CCacheUsed" is messed up and it is likely to be the cause of your memory allocation error. We check the amount of memory available to the system and also the amount of available memory in the compressed cache before returning allocation error. I am going to check it. BTW, I am going to file this bug report on the project site now. Con Kolivas reported a bug that is likely to be related to the bug you hit. Thanks for the report. Regards, -- Rodrigo |
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