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Php-fpm7.1 mmap / munmap (very) slow performance on virtualized systems (huge page)

My php-fpm process is experiencing performance issues on Ubuntu 14.04 LTS (Nginx server, MariaDB database).

strace -f $(pidof php-fpm7.1 | sed 's/\([0-9]*\)/\-p \1/g')

Gave me

<... epoll_wait resumed> {}, 1, 1000) = 0
[pid 32533] epoll_wait(8, {}, 1, 103)   = 0
[pid 32533] epoll_wait(8,  <unfinished ...>
[pid 32535] mmap(NULL, 2097152, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fd933fdd000
[pid 32535] munmap(0x7fd933fdd000, 2097152) = 0
[pid 32535] mmap(NULL, 4190208, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fd933dde000
[pid 32535] munmap(0x7fd933dde000, 139264) = 0
[pid 32535] munmap(0x7fd934000000, 1953792) = 0
[pid 32535] madvise(0x7fd933e00000, 2097152, MADV_HUGEPAGE) = 0
[pid 32533] <... epoll_wait resumed> {}, 1, 897) = 0
[pid 32533] epoll_wait(8, {}, 1, 1000)  = 0
[pid 32533] epoll_wait(8, {}, 1, 1000)  = 0
[pid 32533] epoll_wait(8,  <unfinished ...>
[pid 32535] mmap(NULL, 2097152, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fd933c00000
[pid 32535] madvise(0x7fd933c00000, 2097152, MADV_HUGEPAGE) = 0
[pid 32533] <... epoll_wait resumed> {}, 1, 1000) = 0
[pid 32533] epoll_wait(8, {}, 1, 1000)  = 0
[pid 32533] epoll_wait(8, {}, 1, 1000)  = 0
[pid 32533] epoll_wait(8, {}, 1, 1000)  = 0
[pid 32533] epoll_wait(8,  <unfinished ...>
[pid 32535] mmap(NULL, 2097152, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fd933a00000
[pid 32535] madvise(0x7fd933a00000, 2097152, MADV_HUGEPAGE) = 0
[pid 32533] <... epoll_wait resumed> {}, 1, 1000) = 0
[pid 32533] epoll_wait(8,  <unfinished ...>
[pid 32535] open("/usr/share/zoneinfo/UTC", O_RDONLY) = 7
[pid 32535] fstat(7, {st_mode=S_IFREG|0644, st_size=118, ...}) = 0
[pid 32535] read(7, "TZif2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 20) = 20
[pid 32535] lseek(7, 0, SEEK_SET)       = 0
[pid 32535] mmap(NULL, 118, PROT_READ, MAP_SHARED, 7, 0) = 0x7fd946835000
[pid 32535] close(7)                    = 0
[pid 32535] munmap(0x7fd946835000, 118) = 0
[pid 32535] pwrite(5, "_sf2_attributes|a:2:{s:14:\"_secu"..., 979, 0) = 979
[pid 32535] close(5)                    = 0
[pid 32535] mmap(NULL, 2097152, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fd933200000
[pid 32535] madvise(0x7fd933200000, 2097152, MADV_HUGEPAGE) = 0

I tried with php-fpm7.0, PHPMod7.1, but the same problems.

The processor is up to 100% on requests with a small amount of data.

Configurations are standard.

On a duplicate instance, php5.6-fpm works well.

Edit: perhaps a related PHP script continues to do mmap / munmap

Edit: I tried to include huge pages https://wiki.debian.org/Hugepages A cat /proc/meminfo | grep Hugegave me

AnonHugePages:    108544 kB
HugePages_Total:     512
HugePages_Free:      497
HugePages_Rsvd:       50
HugePages_Surp:        0
Hugepagesize:       2048 kB

but still the same question.

: / OPCache, opcache.huge_code_pages=0, . http://php.net/

+6
1

,

cat /sys/kernel/mm/transparent_hugepage/enabled

, madvise ( mmaps MADV_HUGEPAGE), .

, , , (THP 2 , , ). :

cat /proc/vmstat |grep compact

. ?

:

cat /proc/YOUR_PROCESS_PID/stack

:

cat /proc/buddyinfo

. . 2 4 . :

cat /proc/pagetypeinfo

.

+1

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