fcntl(88, F_SETFL, O_RDWR|O_NONBLOCK) = 0
accept4(88, {sa_family=AF_UNIX}, [128->2], SOCK_CLOEXEC) = 95
fcntl(88, F_SETFL, O_RDWR) = 0
fcntl(95, F_SETFD, FD_CLOEXEC) = 0
futex(0x7f65e917eae0, FUTEX_WAIT_PRIVATE, 2, NULL) = -1 EAGAIN
(Resource temporarily unavailable)
futex(0x7f65e917eae0, FUTEX_WAKE_PRIVATE, 1) = 0
futex(0x7f656bf20ca4, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x7f656bf20ca0,
FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
futex(0x55ce6e382888, FUTEX_WAKE_PRIVATE, 1) = 1
poll([{fd=87, events=POLLIN}, {fd=88, events=POLLIN}], 2, -1) = 1
([{fd=88, revents=POLLIN}])
fcntl(88, F_GETFL) = 0x2 (flags O_RDWR)
fcntl(88, F_SETFL, O_RDWR|O_NONBLOCK) = 0
accept4(88, {sa_family=AF_UNIX}, [128->2], SOCK_CLOEXEC) = 104
fcntl(88, F_SETFL, O_RDWR) = 0
fcntl(104, F_SETFD, FD_CLOEXEC) = 0
futex(0x7f65be075ca4, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x7f65be075ca0,
FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
futex(0x55ce6e382948, FUTEX_WAKE_PRIVATE, 1) = 1
poll([{fd=87, events=POLLIN}, {fd=88, events=POLLIN}], 2, -1) = 1
([{fd=88, revents=POLLIN}])
fcntl(88, F_GETFL) = 0x2 (flags O_RDWR)
fcntl(88, F_SETFL, O_RDWR|O_NONBLOCK) = 0
accept4(88, {sa_family=AF_UNIX}, [128->2], SOCK_CLOEXEC) = 101
fcntl(88, F_SETFL, O_RDWR) = 0
fcntl(101, F_SETFD, FD_CLOEXEC) = 0
Am 16.07.2017 um 07:33 schrieb Reindl Harald:
simple reproducer script below, obviously it needs the '-k'
(keep-alive) flag, otherwise not enough contention on the database
server
ab -c 200 -n 500000 -k http://corecms/connect-bench.php
[root@srv-rhsoft:~]$ cat php_error.log | wc -l
312326
<?php declare(strict_types=1);
require __DIR__ . '/php/serverconf.inc.php';
$conn = mysqli_init();
mysqli_options($conn, MYSQLI_OPT_INT_AND_FLOAT_NATIVE, true);
if(mysqli_real_connect($conn, 'localhost', $sql_user, $sql_pwd,
$sql_db, 3600, '', 0) === true)
{
echo 'OK';
}
else
{
echo 'FAILED';
}
?>
[harry@srv-rhsoft:~]$ php -v
PHP 7.1.8-dev (cli) (built: Jul 13 2017 17:26:17) ( NTS )
[harry@srv-rhsoft:~]$ rpm -q mariadb
mariadb-10.2.7-5.fc25.20170714.rh.x86_64
Am 16.07.2017 um 06:55 schrieb Reindl Harald:
i started to play around with "thread_handling = pool-of-threads"
with 10.2.7 and removed at that time the @mysqli_real_connect()
error supression of my database-layer which also has a usleep() and
retry-loop in case connection failed on so completly burried the issue
PHP Warning: mysqli_real_connect() [<a
href='http://at.php.net/manual/de/function.mysqli-real-connect.php'>function.mysqli-real-connect.php</a>]:
(HY000/2002): Resource temporarily unavailable
you should not see such messages when run a "ab -c 200 -n 500000 -k
http://corecms/show_content.php?sid=2"; with "max_connections = 300"
_____________________________________
thread_handling = one-thread-per-connection
[root@srv-rhsoft:~]$ cat php_error.log | wc -l
52596
thread_handling = pool-of-threads
thread_pool_idle_timeout = 900
[root@srv-rhsoft:~]$ cat php_error.log | wc -l
39282
thread_handling = pool-of-threads
thread_pool_oversubscribe = 10
thread_pool_idle_timeout = 900
thread_pool_priority = high
[root@srv-rhsoft:~]$ cat php_error.log | wc -l
24849
since my database-layer makes a usleep(100000) before each retry and
the retry-lop still has error-supression that means the cms waits
10% of all requests at least 0.1 seconds for the mariadb server
which means the 4300 Requests/Second could be much higher if every
connection suceeds at the first try (at least the thread pool seems
to work slightly better then without)
_____________________________________
what makes me really worry here is while the load is running (mysqld
each time restartet before start apache-benchmark)
+-------------------------+-------+
| Variable_name | Value |
+-------------------------+-------+
| Threadpool_idle_threads | 181 |
| Threadpool_threads | 189 |
+-------------------------+-------+
after the benchmark has finished and the machine is idle:
+-------------------------+-------+
| Variable_name | Value |
+-------------------------+-------+
| Threadpool_idle_threads | 207 |
| Threadpool_threads | 208 |
+-------------------------+-------+
frankly i would expect at least that this numbers are going up while
the load is running to at least 200 or not going up that high at all
but don't refuse conncetions which is IMHO the point of a pool
