我最初发布于https://stackoverflow.com/questions/9665189/php-on-command-line-displays-out-of-memory但建议改为在此处发布。
这不是脚本内存不足时出现的正常致命错误，因为它没有给出文件名、行号或使用的内存量。每当我尝试在命令行上运行 php 时，它都只会显示“内存不足”，无论是传递脚本还是直接运行 php 本身。即使尝试运行不存在的脚本也会显示相同的消息。
换句话说，我得到了这个：
dan@server [~]# php
Out of memory
dan@server [~]# php test.php
Out of memory
dan@server [~]# php doesntexist.php
Out of memory
dan@server [~]# php -v
Out of memory
但是 PHP 通过 Apache 运行得非常好。只是在 CLI 上我遇到了这个错误。
有问题的机器运行的是 CentOS 版本 5.7 (最终版)，64 位，PHP 5.3.10。它是一台专用服务器。
我已尝试按照建议运行 ulimit -a，这是输出：
core file size (blocks, -c) 200000
data seg size (kbytes, -d) 200000
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 37888
max locked memory (kbytes, -l) 32
max memory size (kbytes, -m) 200000
open files (-n) 100
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 8192
cpu time (seconds, -t) unlimited
max user processes (-u) 35
virtual memory (kbytes, -v) 200000
file locks (-x) unlimited
root 上的 free -m 给出如下结果：
total used free shared buffers cached
Mem: 3824 3714 110 0 142 2632
-/+ buffers/cache: 939 2885
Swap: 3490 0 3490
从顶部开始显示内存使用情况：
Mem: 3916648k total, 3797056k used, 119592k free, 145820k buffers
Swap: 3574452k total, 168k used, 3574284k free, 2686844k cached
更新：昨天重启了服务器，下午剩下的时间都正常工作了。但是今天又出现了同样的问题。
运行“strace php test.php”（一个存在的文件），它会持续一段时间，但 putty 中的最后一页左右是这样的：
fstat(3, {st_mode=S_IFREG|0644, st_size=100030, ...}) = 0
mmap(NULL, 100030, PROT_READ, MAP_PRIVATE, 3, 0) = 0x2ad3ce0af000
close(3) = 0
open("/lib64/libnss_dns.so.2", O_RDONLY) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\340\17\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=23736, ...}) = 0
mmap(NULL, 2113792, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = -1 ENOMEM (Cannot allocate memory)
close(3) = 0
munmap(0x2ad3ce0af000, 100030) = 0
alarm(0) = 0
futex(0x3d80e07b20, FUTEX_WAKE_PRIVATE, 2147483647) = 0
futex(0x3d80e079a0, FUTEX_WAKE_PRIVATE, 2147483647) = 0
futex(0x3d7fe94760, FUTEX_WAKE_PRIVATE, 2147483647) = 0
futex(0x3d7fe94c10, FUTEX_WAKE_PRIVATE, 2147483647) = 0
stat("/etc/krb5.conf", {st_mode=S_IFREG|0644, st_size=608, ...}) = 0
open("/proc/filesystems", O_RDONLY) = 3
read(3, "nodev\tsysfs\nnodev\trootfs\nnodev\tb"..., 4095) = 314
close(3) = 0
open("/etc/krb5.conf", O_RDONLY) = 3
open("/proc/filesystems", O_RDONLY) = 4
read(4, "nodev\tsysfs\nnodev\trootfs\nnodev\tb"..., 4095) = 314
close(4) = 0
access("/etc/krb5.conf", W_OK) = -1 EACCES (Permission denied)
fstat(3, {st_mode=S_IFREG|0644, st_size=608, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2ad3ce0af000
read(3, "[logging]\n default = FILE:/var/l"..., 4096) = 608
read(3, "", 4096) = 0
close(3) = 0
munmap(0x2ad3ce0af000, 4096) = 0
open("/dev/urandom", O_RDONLY) = 3
fstat(3, {st_mode=S_IFCHR|0444, st_rdev=makedev(1, 9), ...}) = 0
read(3, "\300\260\36co\363cI\t\355\324\3518gy\354\357\314Z:", 20) = 20
close(3) = 0
futex(0x3d7f624640, FUTEX_WAKE_PRIVATE, 2147483647) = 0
open("/proc/filesystems", O_RDONLY) = 3
read(3, "nodev\tsysfs\nnodev\trootfs\nnodev\tb"..., 4095) = 314
close(3) = 0
open("/etc/krb5.keytab", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/proc/filesystems", O_RDONLY) = 3
read(3, "nodev\tsysfs\nnodev\trootfs\nnodev\tb"..., 4095) = 314
close(3) = 0
futex(0x3d8122d0c0, FUTEX_WAKE_PRIVATE, 2147483647) = 0
stat("/dev/urandom", {st_mode=S_IFCHR|0444, st_rdev=makedev(1, 9), ...}) = 0
brk(0x340b000) = 0x340b000
brk(0x342c000) = 0x340b000
mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = -1 ENOMEM (Cannot allocate memory)
mmap(NULL, 134217728, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, -1, 0) = -1 ENOMEM (Cannot allocate memory)
mmap(NULL, 67108864, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, -1, 0) = -1 ENOMEM (Cannot allocate memory)
mmap(NULL, 134217728, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, -1, 0) = -1 ENOMEM (Cannot allocate memory)
mmap(NULL, 67108864, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, -1, 0) = -1 ENOMEM (Cannot allocate memory)
write(2, "Out of memory\n", 14Out of memory
) = 14
exit_group(1) = ?
编辑：根据 sonassi 的要求添加了输出。
完整日志可访问http://www.2shared.com/file/05MVRFI6/dmp.html
cat /proc/meminfo 的输出：
MemTotal: 3916648 kB
MemFree: 501180 kB
Buffers: 335276 kB
Cached: 2312536 kB
SwapCached: 0 kB
Active: 1312888 kB
Inactive: 1702096 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 3916648 kB
LowFree: 501180 kB
SwapTotal: 3574452 kB
SwapFree: 3574292 kB
Dirty: 728 kB
Writeback: 0 kB
AnonPages: 367160 kB
Mapped: 33640 kB
Slab: 351564 kB
PageTables: 18588 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
CommitLimit: 5532776 kB
Committed_AS: 1188280 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 265828 kB
VmallocChunk: 34359471827 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
Hugepagesize: 2048 kB
运行 php test.php 后 cat /proc/meminfo 的输出如下。我在这里替换了服务器的 IP 地址，因为它是一个公共 IP - xxx.xxx.xxx.11 是服务器的主 IP，xxx.xxx.xxx.12 是另一个 IP。
Firewall: *UDP_IN Blocked* IN=eth0 OUT= MAC=00:23:ae:8f:59:78:30:37:a6:da:d2:e9:08:00 SRC=93.191.199.110 DST=xxx.xxx.xxx.11 LEN=32 TOS=0x00 PREC=0x00 TTL=3 ID=271 PROTO=UDP SPT=10170 DPT=33437 LEN=12
Firewall: *TCP_IN Blocked* IN=eth0 OUT= MAC=00:23:ae:8f:59:78:30:37:a6:da:d2:e9:08:00 SRC=89.39.188.210 DST=xxx.xxx.xxx.11 LEN=48 TOS=0x00 PREC=0x00 TTL=117 ID=47199 DF PROTO=TCP SPT=2119 DPT=4899 WINDOW=65535 RES=0x00 SYN URGP=0
Firewall: *TCP_IN Blocked* IN=eth0 OUT= MAC=00:23:ae:8f:59:78:30:37:a6:da:d2:e9:08:00 SRC=89.39.188.210 DST=xxx.xxx.xxx.11 LEN=48 TOS=0x00 PREC=0x00 TTL=117 ID=47678 DF PROTO=TCP SPT=2119 DPT=4899 WINDOW=65535 RES=0x00 SYN URGP=0
Firewall: *TCP_IN Blocked* IN=eth0 OUT= MAC=00:23:ae:8f:59:78:30:37:a6:da:d2:e9:08:00 SRC=89.39.188.210 DST=xxx.xxx.xxx.11 LEN=48 TOS=0x00 PREC=0x00 TTL=117 ID=48675 DF PROTO=TCP SPT=2119 DPT=4899 WINDOW=65535 RES=0x00 SYN URGP=0
Firewall: *TCP_IN Blocked* IN=eth0 OUT= MAC=00:23:ae:8f:59:78:30:37:a6:da:d2:e9:08:00 SRC=198.60.169.59 DST=xxx.xxx.xxx.11 LEN=48 TOS=0x00 PREC=0x00 TTL=116 ID=16299 DF PROTO=TCP SPT=3185 DPT=5555 WINDOW=16384 RES=0x00 SYN URGP=0
Firewall: *TCP_IN Blocked* IN=eth0 OUT= MAC=00:23:ae:8f:59:78:30:37:a6:da:d2:e9:08:00 SRC=198.60.169.59 DST=xxx.xxx.xxx.12 LEN=48 TOS=0x00 PREC=0x00 TTL=116 ID=16300 DF PROTO=TCP SPT=3186 DPT=5555 WINDOW=16384 RES=0x00 SYN URGP=0
Firewall: *TCP_IN Blocked* IN=eth0 OUT= MAC=00:23:ae:8f:59:78:30:37:a6:da:d2:e9:08:00 SRC=198.60.169.59 DST=xxx.xxx.xxx.12 LEN=48 TOS=0x00 PREC=0x00 TTL=116 ID=17038 DF PROTO=TCP SPT=3186 DPT=5555 WINDOW=16384 RES=0x00 SYN URGP=0
Firewall: *TCP_IN Blocked* IN=eth0 OUT= MAC=00:23:ae:8f:59:78:30:37:a6:da:d2:e9:08:00 SRC=198.60.169.59 DST=xxx.xxx.xxx.11 LEN=48 TOS=0x00 PREC=0x00 TTL=116 ID=17073 DF PROTO=TCP SPT=3185 DPT=5555 WINDOW=16384 RES=0x00 SYN URGP=0
Firewall: *TCP_IN Blocked* IN=eth0 OUT= MAC=00:23:ae:8f:59:78:30:37:a6:da:d2:e9:08:00 SRC=188.254.224.225 DST=xxx.xxx.xxx.12 LEN=48 TOS=0x00 PREC=0x00 TTL=113 ID=39888 PROTO=TCP SPT=59828 DPT=5900 WINDOW=65535 RES=0x00 SYN URGP=0
Firewall: *TCP_IN Blocked* IN=eth0 OUT= MAC=00:23:ae:8f:59:78:30:37:a6:da:d2:e9:08:00 SRC=188.254.224.225 DST=xxx.xxx.xxx.11 LEN=48 TOS=0x00 PREC=0x00 TTL=113 ID=43041 PROTO=TCP SPT=59828 DPT=5900 WINDOW=65535 RES=0x00 SYN URGP=0
Firewall: *UDP_IN Blocked* IN=eth0 OUT= MAC=00:23:ae:8f:59:78:30:37:a6:da:d2:e9:08:00 SRC=93.191.199.110 DST=xxx.xxx.xxx.11 LEN=32 TOS=0x00 PREC=0x00 TTL=1 ID=269 PROTO=UDP SPT=10202 DPT=33437 LEN=12
Firewall: *UDP_IN Blocked* IN=eth0 OUT= MAC=00:23:ae:8f:59:78:30:37:a6:da:d2:e9:08:00 SRC=93.191.199.110 DST=xxx.xxx.xxx.11 LEN=32 TOS=0x00 PREC=0x00 TTL=1 ID=269 PROTO=UDP SPT=10202 DPT=33437 LEN=12
Firewall: *UDP_IN Blocked* IN=eth0 OUT= MAC=00:23:ae:8f:59:78:30:37:a6:da:d2:e9:08:00 SRC=93.191.199.110 DST=xxx.xxx.xxx.11 LEN=32 TOS=0x00 PREC=0x00 TTL=2 ID=270 PROTO=UDP SPT=10202 DPT=33437 LEN=12
Firewall: *UDP_IN Blocked* IN=eth0 OUT= MAC=00:23:ae:8f:59:78:30:37:a6:da:d2:e9:08:00 SRC=93.191.199.110 DST=xxx.xxx.xxx.11 LEN=32 TOS=0x00 PREC=0x00 TTL=2 ID=270 PROTO=UDP SPT=10202 DPT=33437 LEN=12
Firewall: *UDP_IN Blocked* IN=eth0 OUT= MAC=00:23:ae:8f:59:78:30:37:a6:da:d2:e9:08:00 SRC=93.191.199.110 DST=xxx.xxx.xxx.11 LEN=32 TOS=0x00 PREC=0x00 TTL=3 ID=271 PROTO=UDP SPT=10202 DPT=33437 LEN=12
Firewall: *UDP_IN Blocked* IN=eth0 OUT= MAC=00:23:ae:8f:59:78:30:37:a6:da:d2:e9:08:00 SRC=93.191.199.110 DST=xxx.xxx.xxx.11 LEN=32 TOS=0x00 PREC=0x00 TTL=3 ID=271 PROTO=UDP SPT=10202 DPT=33437 LEN=12
Firewall: *UDP_IN Blocked* IN=eth0 OUT= MAC=00:23:ae:8f:59:78:30:37:a6:da:d2:e9:08:00 SRC=65.111.170.208 DST=xxx.xxx.xxx.11 LEN=444 TOS=0x00 PREC=0x00 TTL=52 ID=0 DF PROTO=UDP SPT=5105 DPT=5060 LEN=424
Firewall: *UDP_IN Blocked* IN=eth0 OUT= MAC=00:23:ae:8f:59:78:30:37:a6:da:d2:e9:08:00 SRC=65.111.170.208 DST=xxx.xxx.xxx.12 LEN=443 TOS=0x00 PREC=0x00 TTL=52 ID=0 DF PROTO=UDP SPT=5105 DPT=5060 LEN=423
TCP: Treason uncloaked! Peer 82.129.64.220:5306/59348 shrinks window 3410313698:3410313754. Repaired.
Firewall: *UDP_IN Blocked* IN=eth0 OUT= MAC=00:23:ae:8f:59:78:30:37:a6:da:d2:e9:08:00 SRC=223.203.192.53 DST=xxx.xxx.xxx.12 LEN=1500 TOS=0x00 PREC=0x00 TTL=47 ID=2742 PROTO=UDP SPT=0 DPT=0 LEN=44665
cat /etc/security/limits.conf 显示据我所知所有内容都被注释掉了：
# /etc/security/limits.conf
#
#Each line describes a limit for a user in the form:
#
#<domain> <type> <item> <value>
#
#Where:
#<domain> can be:
# - an user name
# - a group name, with @group syntax
# - the wildcard *, for default entry
# - the wildcard %, can be also used with %group syntax,
# for maxlogin limit
#
#<type> can have the two values:
# - "soft" for enforcing the soft limits
# - "hard" for enforcing hard limits
#
#<item> can be one of the following:
# - core - limits the core file size (KB)
# - data - max data size (KB)
# - fsize - maximum filesize (KB)
# - memlock - max locked-in-memory address space (KB)
# - nofile - max number of open files
# - rss - max resident set size (KB)
# - stack - max stack size (KB)
# - cpu - max CPU time (MIN)
# - nproc - max number of processes
# - as - address space limit
# - maxlogins - max number of logins for this user
# - maxsyslogins - max number of logins on the system
# - priority - the priority to run user process with
# - locks - max number of file locks the user can hold
# - sigpending - max number of pending signals
# - msgqueue - max memory used by POSIX message queues (bytes)
# - nice - max nice priority allowed to raise to
# - rtprio - max realtime priority
#
#<domain> <type> <item> <value>
#
#* soft core 0
#* hard rss 10000
#@student hard nproc 20
#@faculty soft nproc 20
#@faculty hard nproc 50
#ftp hard nproc 0
#@student - maxlogins 4
# End of file
cat /etc/sysctl.conf 的输出如下：
# Kernel sysctl configuration file for Red Hat Linux
#
# For binary values, 0 is disabled, 1 is enabled. See sysctl(8) and
# sysctl.conf(5) for more details.
# Controls IP packet forwarding
net.ipv4.ip_forward = 0
# Controls source route verification
net.ipv4.conf.default.rp_filter = 1
# Do not accept source routing
net.ipv4.conf.default.accept_source_route = 0
# Controls the System Request debugging functionality of the kernel
kernel.sysrq = 0
# Controls whether core dumps will append the PID to the core filename
# Useful for debugging multi-threaded applications
kernel.core_uses_pid = 1
# Controls the use of TCP syncookies
net.ipv4.tcp_syncookies = 1
# Controls the maximum size of a message, in bytes
kernel.msgmnb = 65536
# Controls the default maxmimum size of a mesage queue
kernel.msgmax = 65536
# Controls the maximum shared segment size, in bytes
kernel.shmmax = 68719476736
# Controls the maximum number of shared memory segments, in pages
kernel.shmall = 4294967296
编辑：更新上面的 ulimit 以作为 dan 而不是 root 运行。
答案1
重读完你上述评论后和您的原始帖子 - 您ulimit -a以root- 但您说这root不受影响。
你的问题在这里是 ulimit，但在用户级别。以您的用户身份登录dan并运行ulimit -a，您可能会发现您的内存有限。